MESO: Mesoscale Discussion 0333

ACUS11 KWNS 220332
SWOMCD
SPC MCD 220331
TXZ000-NMZ000-220430-

MESOSCALE DISCUSSION 0333
NWS STORM PREDICTION CENTER NORMAN OK
1031 PM CDT WED APR 21 2010

AREAS AFFECTED...PARTS OF SERN-ERN NM AND W TX

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 220331Z - 220430Z

A NEW WATCH IS BEING CONSIDERED FOR PARTS OF SERN-ERN NM INTO W
TX...AND WOULD INCLUDE SOME OF THE WRN EXTENT OF WW 73 WHICH IS
SCHEDULED TO EXPIRE AT 04Z.

OBJECTIVE ANALYSES INDICATED DRY LINE HAS CONTINUED TO RETREAT WWD
WITH SURFACE DEWPOINTS IN THE LOWER 50S NOW LOCATED INTO SERN NM.
THE COMBINATION OF UPSLOPE FLOW ACROSS SERN NM WITHIN THE MOISTENING
AIR MASS AND BENEATH GRADUAL HEIGHT FALLS WITH THE APPROACH OF THE
WRN CLOSED LOW/TROUGH ARE LIKELY AIDING IN THE RECENT TSTM
DEVELOPMENT OVER SERN NM. 18Z GFS/00Z RUC INDICATE THIS ONGOING
DEVELOPMENT WITH ACTIVITY SPREADING INTO W TX OVERNIGHT. ALTHOUGH
INSTABILITY IS SOMEWHAT MODEST /MUCAPE AROUND 1000 J/KG/...STEEP
LAPSE RATES /7-8 C/KM/ AND STRENGTHENING W TX LLJ AND SWLY FLOW
ALOFT WILL MAINTAIN EFFECTIVE BULK SHEAR 35-45 KT FOR AT LEAST A FEW
ORGANIZED UPDRAFTS WITH THE INITIAL SERN NM STORMS.
HOWEVER...SEVERE POTENTIAL COULD INCREASE AS ACTIVITY SPREADS EWD
INTO W TX WHERE GREATER INSTABILITY WILL BE MAINTAINED PER INFLUX OF
HIGHER MOISTURE ALONG LLJ.

..PETERS.. 04/22/2010

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LUB...AMA...MAF...ABQ...EPZ...

LAT...LON 32420525 33930433 34830415 35430392 35640288 35630181
34840165 33590159 32600177 32110224 32020319 32060478
32420525

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KFGZ [220314]: Preliminary Local Storm Report...summary

NWUS55 KFGZ 220314
LSRFGZ

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
913 PM MDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1056 AM NON-TSTM WND GST DONEY PARK 35.27N 111.51W
04/21/2010 M61 MPH COCONINO AZ MESONET

1216 PM NON-TSTM WND GST TUBA CITY 36.12N 111.24W
04/21/2010 M64 MPH COCONINO AZ MESONET

1230 PM DUST STORM 10 W WINSLOW 35.03N 110.88W
04/21/2010 COCONINO AZ DEPT OF HIGHWAYS

DUST STORM CLOSED I-40 WEST OF WINSLOW UNTIL 530 PM MST

0103 PM NON-TSTM WND GST WINSLOW 35.03N 110.71W
04/21/2010 M60 MPH NAVAJO AZ ASOS

0401 PM NON-TSTM WND GST TWO GUNS 35.12N 111.09W
04/21/2010 M60 MPH COCONINO AZ DEPT OF HIGHWAYS

&&

EVENT NUMBER FGZ1000065 FGZ1000066 FGZ1000067 FGZ1000068 FGZ1000069

$$

JJ

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WATCHES: Severe Thunderstorm Watch - Number 72

WWUS20 KWNS 220303
SEL2
SPC WW 220303
COZ000-NMZ000-OKZ000-TXZ000-220300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH - NUMBER 72
NWS STORM PREDICTION CENTER NORMAN OK
903 PM MDT WED APR 21 2010

THE NWS STORM PREDICTION CENTER HAS CANCELLED
SEVERE THUNDERSTORM WATCH NUMBER 72 ISSUED AT 250 PM MDT FOR PORTIONS OF

COLORADO
NEW MEXICO
OKLAHOMA
TEXAS

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KLKN [220255]: Preliminary Local Storm Report

NWUS55 KLKN 220255
LSRLKN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ELKO NV
755 PM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0820 AM SNOW 8 E AUSTIN 39.48N 116.92W
04/21/2010 M10.0 INCH LANDER NV TRAINED SPOTTER

&&

$$

86

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KLUB [220234]: Preliminary Local Storm Report

NWUS54 KLUB 220234
LSRLUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LUBBOCK TX
934 PM CDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0921 PM HAIL 6 NW CHILDRESS 34.49N 100.32W
04/21/2010 E1.50 INCH CHILDRESS TX TRAINED SPOTTER

1 MILE NORTHWEST OF CAREY

&&

EVENT NUMBER LUB1000058

$$

MCONDER

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KGJT [220220]: Preliminary Local Storm Report

NWUS55 KGJT 220220
LSRGJT

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
819 PM MDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0630 PM NON-TSTM WND GST 6 NW MACK 39.28N 108.95W
04/21/2010 M64 MPH MESA CO TRAINED SPOTTER

ONE TREE AND SEVERAL BRANCHES WERE BLOWN DOWN BY WIND
GUSTS.

&&

EVENT NUMBER GJT1000465

$$

MCS

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MESO: Mesoscale Discussion 0332

ACUS11 KWNS 220206
SWOMCD
SPC MCD 220206
TXZ000-OKZ000-KSZ000-COZ000-NMZ000-220300-

MESOSCALE DISCUSSION 0332
NWS STORM PREDICTION CENTER NORMAN OK
0906 PM CDT WED APR 21 2010

AREAS AFFECTED...SERN CO/NERN NM/TX AND OK PANHANDLES/FAR SWRN KS

CONCERNING...SEVERE THUNDERSTORM WATCH 72...

VALID 220206Z - 220300Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 72
CONTINUES.

REGIONAL RADAR IMAGERY AT 02Z DEPICTS A LOOSELY ORGANIZED MCS MOVING
EWD ACROSS SERN CO...WITH WIDELY ISOLATED CELLS LOCATED TO ITS S
OVER NERN NM. 00Z DDC AND AMA RAOBS SHOW A RATHER STABLE BOUNDARY
LAYER AIRMASS RESIDES E OF WW 72...WHICH SHOULD MITIGATE SURFACE
BASED THUNDERSTORM THREAT AS CURRENT ACTIVITY APPROACHES ERN EDGE OF
WATCH. HOWEVER...SHORT TERM MODEL GUIDANCE INDICATES 850 MB MOISTURE
TRANSPORT AND WAA WILL STRENGTHEN DURING THE NIGHT OVER SWRN KS AS
SLY LLJ INTENSIFIES AHEAD OF APPROACHING UPPER TROUGH. THIS MAY AID
IN MAINTAINING EWD MOVEMENT OF CURRENT ACTIVITY OVER SERN CO INTO
SWRN KS...OR...COULD RESULT IN NEW DEVELOPMENT AHEAD OF THE ONGOING
MCS.

RUC FORECAST SOUNDINGS OVER SW KS AND THE TX/OK PANHANDLES INDICATE
STEEP MID LEVEL LAPSE RATES WILL BE IN PLACE...WITH MUCAPE VALUES
APPROACHING 1000-1500 J/KG TOWARD 04-06Z. IN ADDITION...EFFECTIVE
BULK SHEAR VALUES WILL RESIDE AROUND 30-40 KT OVER THE
PANHANDLE...TO 50 KT IN SW KS. THIS ENVIRONMENT MAY SUPPORT A THREAT
FOR LARGE HAIL...WITH THE THREAT FOR DAMAGING WIND GUSTS BEING
MITIGATED BY A STABLE BOUNDARY LAYER. THOUGH WW 72 WILL LIKELY BE
ALLOWED TO EXPIRE AT 03Z...LOCATIONS DOWNSTREAM WILL BE MONITORED
FOR INCREASING SEVERE POTENTIAL AND POSSIBLY AN ADDITIONAL WW LATER
IN THE NIGHT.

..GARNER.. 04/22/2010

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...DDC...AMA...PUB...ABQ...

LAT...LON 38120477 38110147 35440101 35470415 38120477

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KPUB [220151]: Preliminary Local Storm Report

NWUS55 KPUB 220151
LSRPUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
751 PM MDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0742 PM HAIL 27 NNW KIM 37.61N 103.54W
04/21/2010 E1.00 INCH LAS ANIMAS CO PUBLIC

&&

$$

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 220058
SWODY1
SPC AC 220057

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0757 PM CDT WED APR 21 2010

VALID 220100Z - 221200Z

..THERE IS A SLGT RISK OF SVR TSTMS PORTIONS SERN CO...SWRN
KS...TX/OK PANHANDLES...NW TX...NERN NM...WRN OK...

..SYNOPSIS...
IN MID-UPPER LEVELS...SPLIT-FLOW PATTERN FEATURES REX CONFIGURATION
OVER WRN NORTH AMERICA WITH RIDGING OVER WRN CANADA AND BROAD
CYCLONIC GYRE CENTERED OVER SRN SIERRA NEVADA RANGE. THIS VORTEX
WILL MOVE EWD THROUGH REMAINDER PERIOD. SEVERAL SMALLER-SCALE
PERTURBATIONS AND VORTICITY BANNERS ARE ORBITING THIS CYCLONE...BUT
ITS CENTROID SHOULD BE LOCATED OVER S-CENTRAL NV BY 12Z. AHEAD OF
THIS SLOW-MOVING BUT LARGE CYCLONE...PROLONGED REGIME OF LOW-LEVEL
LEE TROUGHING WILL PERSIST OVER CENTRAL/SRN HIGH PLAINS. LOW-LEVEL
WAA AND MOISTURE TRANSPORT WILL INTENSIFY THIS EVENING AND EARLY
TONIGHT JUST E OF LEE TROUGHING...AS LLJ LIKEWISE STRENGTHENS TO
APPROXIMATELY 40 KT OVER PORTIONS PERMIAN BASIN AND CAPROCK REGIONS
BY 22/06Z.

AT SFC...23Z ANALYSIS INDICATED WARM FRONTAL ZONE ESEWD FROM LOW
OVER SERN UT...ACROSS EXTREME SRN CO...TO SECONDARY LOW NE
TAD...BECOMING DIFFUSE ACROSS EXTREME SERN CO AND OK
PANHANDLE...THEN BETTER-EVIDENT AGAIN OVER NWRN/N-CENTRAL OK.
EXPECT FRONT TO DRIFT NWD ACROSS KS/OK BORDER REGION...BUT MOVE NWD
FASTER OVER SRN CO. BOUNDARY DELINEATING OUTLINE OF MESOSCALE COLD
POOL WAS DAWN FROM WRN UNION COUNTY NM SEWD TO OLDHAM COUNTY
TX...SWD AGAIN TO BETWEEN PVW-CVS...CURVING EWD BETWEEN
PVW-LBB...THEN ENEWD TOWARD CDS. DRYLINE INTERSECTED THIS BOUNDARY
NEAR LBB AND EXTENDED SWD ACROSS PERMIAN BASIN REGION. DRYLINE WILL
RETREAT WWD OVERNIGHT WITH MOIST ADVECTION YIELDING 50S DEW POINTS
ALONG MUCH OF ERN NM/TX BORDER.

..CENTRAL/SRN HIGH PLAINS REGION...
REF SPC WWS 72-73 AND RELATED MESOSCALE DISCUSSIONS FOR COVERAGE OF
SHORT-TERM SVR SITUATION IN AND NEAR THE WWS.

WIDELY SCATTERED TO SCATTERED TSTMS ARE POSSIBLE OVERNIGHT OVER
PANHANDLES....TX SOUTH-PLAINS AREA...NW TX AND WRN OK. SOME
INCREASE IN CONVECTIVE COVERAGE ALSO MAY OCCUR INVOF TX/NM BORDER
NEXT FEW HOURS AS DRYLINE BACKS INTO AREA OF PRE-EXISTING/HIGH-BASED
TSTMS. RELATIVE INCREASE IN COVERAGE ALSO IS POSSIBLE FARTHER N
OVER SERN CO AND SWRN KS...ALONG AND N OF SYNOPTIC WARM
FRONT...WHERE STRONGER ISENTROPIC ASCENT TO LFC WILL BE AVAILABLE
EITHER FOR ERN MOVEMENT OF EXISTING SERN CO CONVECTION OR NEWER
DEVELOPMENT. MUCAPE WILL INCREASE WITH SWD EXTENT...BUT SO WILL
CINH...RENDERING HIGHER-MAGNITUDE BUT MORE CONDITIONAL SVR HAIL
THREAT FROM CONVECTION. WHILE NONZERO...TORNADO POTENTIAL AFTER
DARK WILL DIMINISH WITH DIABATIC COOLING OF SFC LAYER AND WEAKENING
OF SOLENOIDAL CIRCULATIONS RELATED TO BOUNDARIES...AND ALSO...GIVEN
LACK OF ROBUST SFC THETAE UPSTREAM TO MAINTAIN UNEQUIVOCALLY
SFC-BASED INFLOW PARCELS.

CENTRAL/NRN PANHANDLE AREA REMAINS UNDER INFLUENCE OF
PERSISTENT/RELATIVE COLD POOL AND ACCOMPANYING LAYER OF STATIC
STABILITY NEAR GROUND. THIS AIR MASS WILL BECOME MORE
SHALLOW...WITH WEAKENING STABILITY OVERNIGHT...AS RESIDUAL BOUNDARY
LIFTS NWD AND BECOMES MORE DIFFUSE. MODIFIED AMA RAOB AND RUC FCST
SOUNDINGS SUGGEST CONDITIONAL POTENTIAL FOR STG GUSTS GENERATED
ALOFT TO REACH SFC GIVEN DRYNESS OF AIR WITHIN TOP OF STABLE LAYER
AND HIGHER...I.E. AOA 1/2 KM AGL.

..CENTRAL ROCKIES/INTERMOUNTAIN REGION...
AIR MASS NEAR SFC FCST TO STABILIZE SUBSTANTIALLY AFTER DARK...AS
DIABATIC COOLING OCCURS OVER HIGHER TERRAIN. THIS...ALONG WITH
INCREASING COVERAGE OF RELATIVELY STABILIZED/OUTFLOW AIR FROM
CONVECTION NOW SCATTERED ACROSS THIS REGION...WILL RENDER SVR
POTENTIAL MORE MRGL WITH TIME.

.EDWARDS.. 04/22/2010

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MESO: Mesoscale Discussion 0330

ACUS11 KWNS 212329
SWOMCD
SPC MCD 212329
OKZ000-COZ000-TXZ000-NMZ000-220100-

MESOSCALE DISCUSSION 0330
NWS STORM PREDICTION CENTER NORMAN OK
0629 PM CDT WED APR 21 2010

AREAS AFFECTED...SERN CO/NERN NM/NWRN TX PANHANDLE/FAR WRN OK
PANHANDLE

CONCERNING...SEVERE THUNDERSTORM WATCH 72...

VALID 212329Z - 220100Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 72
CONTINUES.

STRONG TO SEVERE STORMS WILL CONTINUE TO POSE A THREAT FOR LARGE
HAIL/DAMAGING WIND GUSTS AND PERHAPS AN ISOLATED TORNADO DURING THE
LATE AFTERNOON/EARLY EVENING.

AT 23Z...REGIONAL RADAR REFLECTIVITY INDICATED A CLUSTER OF STORMS
WERE OCCURRING JUST TO THE NNE OF TAD IN SERN CO...WHILE FARTHER SE
AN ISOLATED THUNDERSTORM WAS LOCATED OVER EXTREME NERN NM. HI-RES
RADAR REFLECTIVITY AND SRV DATA FROM KPUX INDICATE THAT THE CELLS IN
CO AND NM HAVE DEVELOPED SUPERCELL STRUCTURES OVER THE COURSE OF THE
LAST HOUR OR SO AS THEY SLOWLY MOVE E TOWARD THE HIGH PLAINS. AT THE
SURFACE...LOW PRESSURE WAS POSITIONED BETWEEN RTN AND TAD...WITH A
WARM FRONT EXTENDING E-SEWD ACROSS NERN NM AND THEN SSE INTO THE TX
PANHANDLE. E OF THE WARM FRONT...COOL ESELY WINDS CONTINUE TO
MAINTAIN UPPER 40S TO LOW 50S DEWPOINTS...THOUGH STABILITY IS
RELATIVELY LARGE DUE TO THE PRESENCE OF PERSISTENT LOW LEVEL
STRATUS. W OF THE WARM FRONT...RELATIVELY STRONG AFTERNOON HEATING
HAS LED TO THE DEVELOPMENT OF A WELL MIXED BOUNDARY LAYER AND
REDUCED CINH...WITH MLCAPE VALUES RESIDING AROUND 500-1000 J/KG.

GIVEN THE PRESENCE OF A MORE STABLE BOUNDARY LAYER AND REDUCED CAPE
DOWNSTREAM OVER THE HIGH PLAINS...STORMS MAY STRUGGLE TO MOVE
OUTSIDE OF THE ERN EDGE OF WW 72 DURING THE REMAINDER OF THE
AFTERNOON/EARLY EVENING. HOWEVER...INCREASING SWLY FLOW ALOFT
COMBINED WITH LOW LEVEL E-SELY WINDS WILL RESULT IN CONTINUED
STRENGTHENING OF VERTICAL SHEAR PROFILES SUPPORTIVE OF SUPERCELLS.
THE PRIMARY SEVERE WEATHER THREATS APPEAR TO BE LARGE HAIL AND
DAMAGING WIND GUSTS...THOUGH THE BACKED LOW LEVEL FLOW ALONG AND TO
THE COOL SIDE OF THE WARM FRONT SUGGESTS AN ISOLATED TORNADO WILL
ALSO BE POSSIBLE. LATER TONIGHT...AN INFLUX OF LOW LEVEL MOISTURE
AND INCREASING LOW LEVEL WAA ARE FORECAST TO SPREAD NWD INTO THE
SRN/CENTRAL HIGH PLAINS. THIS MAY SUPPORT UPSCALE GROWTH INTO AN
MCS...AND ALLOW STORMS TO MOVE EWD OUT OF WW 72.

.GARNER.. 04/21/2010

..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...AMA...PUB...ABQ...

LAT...LON 35490415 38130479 38110275 35490219 35490415

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MESO: Mesoscale Discussion 0329

ACUS11 KWNS 212237
SWOMCD
SPC MCD 212237
WYZ000-UTZ000-IDZ000-MTZ000-212330-

MESOSCALE DISCUSSION 0329
NWS STORM PREDICTION CENTER NORMAN OK
0537 PM CDT WED APR 21 2010

AREAS AFFECTED...PORTIONS OF ERN/SERN ID AND NRN UT

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 212237Z - 212330Z

ISOLATED STRONG/DAMAGING WIND GUSTS ALONG WITH HAIL GENERALLY LESS
THAN 1 INCH IN DIAMETER WILL BE POSSIBLE WITH STORMS MOVING NNW
ACROSS NRN UT AND ERN/SERN ID THROUGH THE REMAINDER OF THE AFTERNOON
AND INTO THE EARLY EVENING. GIVEN THE MARGINAL/ISOLATED NATURE OF
THE SEVERE WEATHER THREAT...A WW DOES NOT APPEAR NECESSARY AT THIS
TIME.

THUNDERSTORMS CONTINUE TO DEVELOP/EVOLVE OFF OF A COLD FRONT MOVING
EWD ACROSS UT...WITH ADDITIONAL ACTIVITY FORMING ALONG APPARENT
TROUGH AXIS EXTENDING NNW INTO ERN/SERN ID. MIXED MODE OF CONVECTION
HAS BEEN OBSERVED THUS FAR...WITH SEVERAL CELLS EVOLVING INTO FAST
MOVING SHORT BOWING LINE SEGMENTS...WHICH IS SUPPORTED BY AN
ENVIRONMENT CHARACTERIZED BY STRONG DEEP LAYER MEAN WIND AND SHEAR
VECTORS ALIGNED PARALLEL TO THE SURFACE COLD FRONT. THERMODYNAMIC
ENVIRONMENT IS CHARACTERIZED BY AN AXIS OF SURFACE TEMPERATURES IN
THE 60S LOCATED IMMEDIATELY AHEAD OF THE FRONT AND ID SURFACE
TROUGH...AIDING IN THE DEVELOPMENT OF STEEP LOW TO MID LEVEL LAPSE
RATES AND MLCAPE VALUES AROUND 500-1000 J/KG. RECENT TRENDS IN SFCOA
DATA ALSO INDICATE DESTABILIZATION TAKING PLAINS E OF THE CNTRL
MOUNTAINS AND S OF THE BITTEROOT RANGE IN ID...WHERE INCREASING
LARGE SCALE ASCENT AND STEEPENING MID LEVEL LAPSE RATES APPEAR TO
COINCIDE. THIS MAY ALLOW STRONG STORMS TO EXPAND NNW ACROSS ERN ID
DURING THE NEXT FEW HOURS. HOWEVER...AS THE EVENING
APPROACHES...MODEL GUIDANCE INDICATES THAT THE BOUNDARY LAYER WILL
BEGIN TO STABILIZE ACROSS THE REGION...WHICH WILL LIKELY LEAD TO A
REDUCED POTENTIAL FOR DAMAGING WIND GUSTS AT THE SURFACE.

.GARNER.. 04/21/2010

..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...RIW...TFX...SLC...PIH...MSO...BOI...

LAT...LON 41661201 42761321 45171481 45461423 43541119 41981101
41661201

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WATCHES: Tornado Watch Number 73

WWUS20 KWNS 212109
SEL3
SPC WW 212109
TXZ000-220400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 73
NWS STORM PREDICTION CENTER NORMAN OK
410 PM CDT WED APR 21 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

THE SOUTHERN TEXAS PANHANDLE AND TEXAS SOUTH PLAINS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 410 PM UNTIL
1100 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 75 MILES WEST NORTHWEST OF
PLAINVIEW TEXAS TO 15 MILES SOUTHEAST OF CHILDRESS TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...CONTINUE...WW 72...

DISCUSSION...SURFACE HEATING/MIXING HAS REMOVED MUCH OF THE
CONVECTIVE INHIBITION ALONG A STALLED FRONT...AND THUNDERSTORM
DEVELOPMENT WILL BE POSSIBLE IN THE NEXT COUPLE OF HOURS ALONG THE
FRONT AND IMMEDIATELY NE OF A WEAK MESOLOW NW OF LBB. MODERATE
INSTABILITY IS PRESENT ALONG THE BOUNDARY...AND DEEP-LAYER VERTICAL
SHEAR IS SUFFICIENT FOR SUPERCELLS. THE PRIMARY INITIAL THREAT WILL
BE LARGE HAIL...THOUGH A COUPLE OF TORNADOES WILL ALSO BE POSSIBLE
TOWARD EVENING AS LOW-LEVEL MOISTURE AND SHEAR CONTINUE TO INCREASE
GRADUALLY.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 28015.

..THOMPSON

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WATCHES: Severe Thunderstorm Watch Number 72

WWUS20 KWNS 212047
SEL2
SPC WW 212047
COZ000-NMZ000-OKZ000-TXZ000-220300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 72
NWS STORM PREDICTION CENTER NORMAN OK
250 PM MDT WED APR 21 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

SOUTHEAST COLORADO
NORTHEAST NEW MEXICO
THE EXTREME WESTERN OKLAHOMA PANHANDLE
EXTREME NORTHWEST TEXAS PANHANDLE

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 250 PM UNTIL
900 PM MDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES WEST
NORTHWEST OF LA JUNTA COLORADO TO 50 MILES SOUTHWEST OF DALHART
TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

DISCUSSION...WIDELY SCATTERED THUNDERSTORMS ARE DEVELOPING IN THE
ZONE OF STRONGER SURFACE HEATING AND LOW-LEVEL UPSLOPE FLOW ACROSS
NE NM/SE CO. THE ENVIRONMENT THROUGH THE EVENING WILL BE
CHARACTERIZED BY SUFFICIENT INSTABILITY AND DEEP-LAYER VERTICAL
SHEAR FOR SUPERCELLS...WITH LARGE HAIL THE PRIMARY SEVERE STORM
THREAT.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 32015.

..THOMPSON

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MESO: Mesoscale Discussion 0328

ACUS11 KWNS 212023
SWOMCD
SPC MCD 212022
OKZ000-TXZ000-COZ000-NMZ000-212145-

MESOSCALE DISCUSSION 0328
NWS STORM PREDICTION CENTER NORMAN OK
0322 PM CDT WED APR 21 2010

AREAS AFFECTED...SOUTHEAST CO/NORTHEAST NM/WESTERN OK PANHANDLE/MUCH
OF TX PANHANDLE

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 212022Z - 212145Z

SEVERE RISK IS EXPECTED TO INCREASE THROUGH LATE AFTERNOON/EARLY
EVENING ACROSS PORTIONS OF SOUTHEAST CO/NORTHEAST NM AND THE WESTERN
OK PANHANDLE AND PORTIONS OF THE TX PANHANDLE/TX SOUTH PLAINS. ONE
OR MORE WATCHES MAY BE NEEDED BY 22Z.

MDT/TOWERING CU CONTINUES TO BECOME MORE PREVALENT AT MID AFTERNOON
ACROSS FAR SOUTHEAST CO AND NORTHEAST NM IN OROGRAPHICALLY
FAVORED/FOOTHILL AREAS...WITH ADDITIONAL CUMULIFORM DEVELOPMENT
INCREASING WITHIN A WARM/DEEPLY MIXED BOUNDARY LAYER ALONG THE
EASTERN NM/TX SOUTH PLAINS BORDER VICINITY. FARTHER EAST...STRATUS
FIELD CONTINUES TO ERODE ALONG AND NORTHEAST OF AN EFFECTIVE WARM
FRONT ARCING GENERALLY NW-SE FROM FAR SOUTHEAST CO TO THE SOUTHERN
TX PANHANDLE/TX SOUTH PLAINS/CAPROCK VICINITY INCLUDING THE
PLAINVIEW VICINITY TO SOUTH OF CHILDRESS.

WITH TIME...TSTMS SHOULD INCREASE/ULTIMATELY DEVELOP EAST-SOUTHEAST
ACROSS THE TERRAIN-ADJACENT PLAINS OF SOUTHEAST CO/NORTHEAST NM...AS
WELL AS THE WESTERN PORTIONS OF THE TX PANHANDLE/TX SOUTH PLAINS.
WHILE A MID LEVEL FLOW WEAKNESS IS ASCERTAINED BETWEEN 1-4 KM PER
12Z OBSERVED RAOBS/LATEST PROFILER DATA...GRADUALLY STRENGTHENING
W-SW FLOW ALOFT AND VEERING WIND PROFILES /ESPECIALLY ALONG THE
MODIFYING EFFECTIVE WARM FRONT/ WILL SUPPORT SUPERCELL STRUCTURES.
SEVERE HAIL AND A TORNADO OR TWO WILL ALSO BE POSSIBLE LATE THIS
AFTERNOON/EARLY EVENING...THE LATTER ESPECIALLY WITH ANY STORM
DEVELOPING NEAR/INTERACTING WITH THE EFFECTIVE WARM FRONT ACROSS THE
TX PANHANDLE/TX SOUTH PLAINS/CAPROCK VICINITY WHERE LOW LEVEL FLOW
IS BACKED TO SOUTHEASTERLY.

.GUYER.. 04/21/2010

..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...OUN...LUB...AMA...PUB...ABQ...

LAT...LON 37490472 38170448 37940331 36980304 35240143 34739999
33710014 34220266 36270400 37490472

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 211933
SWODY1
SPC AC 211931

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0231 PM CDT WED APR 21 2010

VALID 212000Z - 221200Z

..THERE IS A SLGT RISK OF SVR TSTMS ACROSS PARTS OF THE GREAT BASIN
AND CNTRL ROCKIES...

..THERE IS A SLGT RISK OF SVR TSTMS OVER PORTIONS OF THE CNTRL/SRN
HIGH PLAINS...

..SERN ID TO WRN CO...

LARGE SCALE FORCING AND ASSOCIATED STRONG BAROCLINIC ZONE IS
EXPECTED TO GRADUALLY SHIFT EAST ACROSS THE GREAT BASIN THROUGH UT
INTO SWRN WY/WRN CO. WITHIN THIS ZONE...A CONSIDERABLE AMOUNT OF
CONVECTION AND SCATTERED THUNDERSTORMS HAVE DEVELOPED WITHIN AN
ENVIRONMENT CHARACTERIZED BY STEEP LOW-MID LEVEL LAPSE RATES...BUT
SOMEWHAT MEAGER MOISTURE. GIVEN THE STRONG SHEAR IN PLACE IT
APPEARS GUSTY WINDS MAY ACCOMPANY THE SUSTAINED UPDRAFTS THAT MANAGE
TO BE MORE EFFICIENT PRECIPITATION PRODUCERS...ESPECIALLY GIVEN THE
RELATIVELY DRY SUB-CLOUD LAYER.

..SRN/CNTRL HIGH PLAINS...

NO CHANGE TO EARLIER FORECAST REGARDING THE POTENTIAL FOR ISOLATED
SEVERE THUNDERSTORMS ACROSS THE HIGH PLAINS. BOUNDARY LAYER IS
WARMING SIGNIFICANTLY ACROSS ERN NM INTO THE TX SOUTH PLAINS...PER
RAPID EXPANSION OF CU FIELD WHERE LAPSE RATES ARE NOW IN EXCESS OF 9
C/KM. WITH TIME A FEW STORMS...SOME OF WHICH SHOULD ROTATE...WILL
LIKELY DEVELOP ALONG RETREATING WARM FRONT INTO SERN CO. OTHER
STORMS WILL DEVELOP LATER TONIGHT WITHIN WARM ADVECTION ZONE ATOP
COOLER RETREATING AIRMASS WEDGED OVER ERN CO/KS/NRN OK...ESPECIALLY
AS LLJ INCREASES IN EXCESS OF 40-45KT.

.DARROW.. 04/21/2010

PREV DISCUSSION... /ISSUED 1115 AM CDT WED APR 21 2010/

..SE TX PANHANDLE TO SE CO THIS AFTERNOON THROUGH EARLY TONIGHT...
LOW-LEVEL MOISTURE IS RETURNING NWD ACROSS W/NW TX WITH BOUNDARY
LAYER DEWPOINTS NOW IN THE MID-UPPER 50S INTO THE PVW-ABI-SPS
AREA...AND A SLOW INCREASE IS EXPECTED THIS AFTERNOON WITH CONTINUED
MOISTURE ADVECTION AND LATENT HEAT FLUX FROM THE MOIST GROUND.
MEANWHILE...CLOUD EROSION AND DAYTIME HEATING FROM S TO N WILL
CONTRIBUTE TO DIFFERENTIAL HEATING AND HELP CONSOLIDATE A
SLOW-MOVING WARM FRONT ALONG THE CAO-AMA-CDS-SPS CORRIDOR...ROUGHLY
ALONG THE RED RIVER INTO PALO DURO CANYON. THIS SURFACE BOUNDARY
WILL SERVE TO FOCUS THUNDERSTORM DEVELOPMENT AS CONVECTIVE
INHIBITION WEAKENS THIS AFTERNOON.

MODERATE INSTABILITY /MLCAPE OF 1000-2000 J PER KG/ IS EXPECTED THIS
AFTERNOON ALONG THE FRONT AND E OF A DIFFUSE DRYLINE. THIS
INSTABILITY...IN COMBINATION WITH A GRADUAL INCREASE IN LOW-MIDLEVEL
FLOW...WILL CONTRIBUTE TO AN ENVIRONMENT FAVORABLE FOR SUPERCELLS
THIS AFTERNOON INTO EARLY TONIGHT...ESPECIALLY IN THE AREA BETWEEN
PVW-AMA-CDS. FORECAST HODOGRAPHS SHOW FAVORABLE VERTICAL WIND SHEAR
FOR PERSISTENT STORMS...AND AN INCREASE IN LOW-LEVEL SHEAR LATE THIS
EVENING WITH A DEVELOPING 25-35 KT SLY/SSELY LLJ. A COUPLE OF
TORNADOES...LARGE HAIL...AND ISOLATED DAMAGING WINDS WILL ALL BE
POSSIBLE FROM MID-LATE AFTERNOON THROUGH AT LEAST EARLY TONIGHT.

FARTHER NW INTO SE CO...LOW-LEVEL UPSLOPE FLOW WILL DRAW UPPER 40S
TO LOWER 50S BOUNDARY LAYER DEWPOINTS NWWD...AND A FEW CLOUD BREAKS
WILL ALLOW SURFACE HEATING IMMEDIATELY E OF THE MOUNTAINS.
THUNDERSTORMS WILL LIKELY DEVELOP THIS AFTERNOON OVER THE HIGH
TERRAIN IN CO AND THEN SPREAD SEWD ALONG THE BAROCLINIC ZONE NEAR
THE RATON MESA. THOUGH INSTABILITY WILL BE WEAKER COMPARED TO AREAS
FARTHER SE IN THE TX PANHANDLE...VERTICAL SHEAR WILL BE SUFFICIENT
FOR SUPERCELLS CAPABLE OF PRODUCING AT LEAST ISOLATED LARGE HAIL AND
DAMAGING GUSTS. OVERNIGHT...CLUSTERS OF ELEVATED THUNDERSTORMS WILL
CONTINUE AND SPREAD EWD/NEWD ACROSS WRN/NRN OK INTO KS IN
ASSOCIATION WITH LOW-LEVEL WAA.

..GREAT BASIN THROUGH LATE EVENING...
A STRONG MIDLEVEL LOW AND ASSOCIATED COLD FRONT WILL CONTINUE TO
MOVE SLOWLY EWD ACROSS UT/AZ THROUGH EARLY TONIGHT. A FOCUSED BELT
OF ASCENT ALONG THE FRONT...COMBINED WITH 7-8 C/KM MIDLEVEL LAPSE
RATES AND STEEPENING LOW-LEVEL LAPSE RATES WITH DAYTIME
HEATING...WILL SUPPORT A BAND OF THUNDERSTORMS WHICH WILL SPREAD EWD
ACROSS UT/SE ID INTO SW WY/WRN CO THROUGH THIS EVENING. THOUGH
INSTABILITY WILL NOT BE PARTICULARLY STRONG...SUBSTANTIAL DEEP-LAYER
SLY SHEAR AND INVERTED-V PROFILES IN THE LOW LEVELS WILL SUPPORT
EMBEDDED BOWING SEGMENTS AND/OR ROTATING STORMS WITH THE POTENTIAL
FOR A FEW DAMAGING GUSTS.

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KAMA [211842]: Preliminary Local Storm Report...corrected

NWUS54 KAMA 211842
LSRAMA

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE AMARILLO TX
138 PM CDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0704 PM TORNADO 3 W BUSHLAND 35.19N 102.12W
04/20/2010 POTTER TX AMATEUR RADIO

TORNADO SURVEY CONDUCTED. TORNADO WAS LOCATED
APPROXIMATELY 1 MILE SOUTH OF INTERSTATE 40 AND REMAINED
OVER OPEN COUNTRY AND LASTED APPROXIMATELY FIVE MINUTES.
NO DAMAGE WAS OBSERVED.

&&

CORRECTED COUNTY/STATE...LOCATION...REMARKS

EVENT NUMBER AMA1000329

$$

SD

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KMFR [211833]: Preliminary Local Storm Report

NWUS56 KMFR 211833
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
1133 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1120 AM HEAVY SNOW SILVER LAKE 43.13N 121.04W
04/21/2010 M4.0 INCH LAKE OR COUNTY OFFICIAL

OVERNIGHT SNOWFALL FROM MIDNIGHT TO 9 AM. WATER
EQUIVALENT OF THE STORM IS M0.55 INCHES

1120 AM HEAVY SNOW PAISLEY 42.69N 120.54W
04/21/2010 M5.5 INCH LAKE OR PARK/FOREST SRVC

SNOWFALL FROM MIDNIGHT TO 9 AM.

1120 AM HEAVY SNOW SUMMER LAKE 42.97N 120.78W
04/21/2010 M2.5 INCH LAKE OR PARK/FOREST SRVC

SNOWFALL FROM MIDNIGHT TO 9 AM.

1120 AM HEAVY SNOW FORT ROCK 43.36N 121.05W
04/21/2010 E3.5 INCH LAKE OR PUBLIC

SNOWFALL FROM MIDNIGHT TO 9 AM.

1120 AM HEAVY SNOW 20 NE SILVER LAKE 43.33N 120.76W
04/21/2010 E4.5 INCH LAKE OR PUBLIC

OVERNIGHT SNOWFALL IN THE CHRISTMAS VALLEY FROM MIDNIGHT
TO AROUND 9 AM. ROADWAYS WERE VERY SLIPPERY EARLIER THIS
MORNING.

&&

$$

BUNNAG

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KSEW [211833]: Preliminary Local Storm Report

NWUS56 KSEW 211833
LSRSEW

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
1133 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1132 AM HEAVY RAIN ISSAQUAH 47.53N 122.04W
04/21/2010 M2.55 INCH KING WA TRAINED SPOTTER

18 HOUR RAIN FALL FROM 5 PM YESTERDAY TO 11 AM TODAY.

&&

$$

GRUB

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KPIH [211830]: Preliminary Local Storm Report

NWUS55 KPIH 211830
LSRPIH

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO
1230 PM MDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1227 PM HEAVY RAIN 1 NE RUPERT 42.63N 113.66W
04/21/2010 M0.44 INCH MINIDOKA ID TRAINED SPOTTER

RAINFALL SINCE OVERNIGHT WITH BULK OF PRECIPITATION
OCCURRING THIS MORNING.

&&

$$

GWICKLUN

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MESO: Mesoscale Discussion 0327

ACUS11 KWNS 211825
SWOMCD
SPC MCD 211824
UTZ000-WYZ000-212000-

MESOSCALE DISCUSSION 0327
NWS STORM PREDICTION CENTER NORMAN OK
0124 PM CDT WED APR 21 2010

AREAS AFFECTED...CNTRL AND ERN UT...FAR SW WY

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 211824Z - 212000Z

THE THREAT FOR STRONG WINDS IS EXPECTED TO INCREASE AS CONVECTION
BECOMES MORE WIDESPREAD. UNCERTAINTY CURRENTLY EXISTS ABOUT THE NEED
FOR A WW...BUT CONVECTIVE TRENDS WILL CONTINUE TO BE MONITORED.

W/V IMAGERY SHOWS A CLOSED UPPER LOW ENTERING THE GREAT BASIN AND A
BAND OF STRONG MOIST ASCENT OVERSPREADING MUCH OF UT. MEANWHILE...A
SFC COLD FRONT IS PUSHING EWD ACROSS WRN UT. AS THE ENVIRONMENT
DESTABILIZES WITH AFTERNOON HEATING AND STEEPENING MID-LEVEL LAPSE
RATES WITH THE APPROACH OF THE UPPER LOW...SBCAPE VALUES OF 500-700
J/KG SHOULD BECOME WIDESPREAD ACROSS THE REGION.

DEEP UNIDIRECTIONAL VERTICAL SHEAR PROFILE IS FAVORABLE FOR
ORGANIZATION OF SOME THUNDERSTORM CELLS INTO BROKEN CONVECTIVE LINES
WITH SMALL EMBEDDED BOWING SEGMENTS...AND PERHAPS A FEW SUPERCELLS.
INVERTED-V SHAPED BL THERMODYNAMIC PROFILE WILL ALSO SUPPORT
DOWNWARD MOMENTUM TRANSFER TO THE SFC WITHIN CONVECTIVE BANDS.
MARGINAL INSTABILITY SHOULD LIMIT THE THREAT FOR LARGE HAIL ACROSS
THE REGION...WITH STRONG WINDS THE PRIMARY THREAT.

..ROGERS.. 04/21/2010

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...RIW...GJT...SLC...

LAT...LON 39141191 40031247 41501306 41891243 41791120 41061032
40000951 38870928 38050958 37541086 37801135 39141191

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KAMA [211825]: Preliminary Local Storm Report...corrected

NWUS54 KAMA 211825
LSRAMA

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE AMARILLO TX
123 PM CDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0747 PM TORNADO 3 NE UMBARGER 34.99N 102.07W
04/20/2010 RANDALL TX BROADCAST MEDIA

TORNADO SURVEY CONDUCTED. BRIEF TOUCHDOWN REPORTED
APPROXIMATELY 3 MILES NORTHEAST OF UMBARGER. TORNADO
REMAINED OVER OPEN COUNTRY. NO APPARENT DAMAGE FROM THE
TORNADO...BUT SEVERAL HOMES RECEIVED DAMAGE FROM WIND
BLOWN HAIL ASSOCIATED WITH THE REAR FLANK DOWNDRAFT.
SEVERAL NORTH FACING WINDOWS WERE BLOWN OUT AND HUNDREDS
OF ACRES OF CROPS DESTROYED.

&&

CORRECTED REMARKS

EVENT NUMBER AMA1000330

$$

SD

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KMFR [211809]: Preliminary Local Storm Report

NWUS56 KMFR 211809
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
1109 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1107 AM HEAVY SNOW SSE MOUNT SHASTA 41.32N 122.31W
04/21/2010 M3.5 INCH SISKIYOU CA TRAINED SPOTTER

815 AM TO 11 AM. STORM TOTAL OF 8 INCHES.

&&

$$

GLASER

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KMFR [211806]: Preliminary Local Storm Report

NWUS56 KMFR 211806
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
1106 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0900 AM HEAVY SNOW 12 NW ADEL 42.30N 120.06W
04/21/2010 M5.5 INCH LAKE OR POST OFFICE

PLUSH POST OFFICE. MIDNIGHT TO 9AM PDT.

1000 AM HEAVY SNOW ADEL 42.18N 119.90W
04/21/2010 M4.0 INCH LAKE OR PARK/FOREST SRVC

SNOW OCCURRED BETWEEN MIDNIGHT AND 10AM PDT.

1000 AM HEAVY SNOW LAKEVIEW 42.19N 120.35W
04/21/2010 M4.0 INCH LAKE OR PARK/FOREST SRVC

LAKEVIEW INTERAGENCY FIRE CENTER. POWER WAS OUT IN
LAKEVIEW FOR A PORTION OF THIS MORNING.

&&

$$

LUTZ

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KMFR [211801]: Preliminary Local Storm Report

NWUS56 KMFR 211801
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
1101 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1059 AM SNOW 8 SSW ASHLAND 42.08N 122.76W
04/21/2010 E4.0 INCH JACKSON OR PUBLIC

ESTIMATED DUE TO STRONG NORTH WINDS 55 MPH GUSTING TO
60.4 FOOT DRIFTS. SNOW OCCURRED IN THE PAST 24 HOURS
ENDING AT 1030 AM.

&&

$$

GLASER

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KHNX [211725]: Preliminary Local Storm Report

NWUS56 KHNX 211725
LSRHNX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY CA
1025 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0941 AM HEAVY SNOW GRANT GROVE 36.74N 118.96W
04/21/2010 M20.6 INCH FRESNO CA CO-OP OBSERVER

&&

$$

BPET

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KMFR [211721]: Preliminary Local Storm Report

NWUS56 KMFR 211721
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
1021 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1020 AM HEAVY SNOW N TENNANT 41.58N 121.91W
04/21/2010 M9.0 INCH SISKIYOU CA TRAINED SPOTTER

11 PM TO 10 AM. STILL SOME OCCASIONAL LIGHT SNOW.

&&

$$

GLASER

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KVEF [211705]: Preliminary Local Storm Report

NWUS55 KVEF 211705
LSRVEF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1004 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0411 AM SNOW 1 SE BISHOP 37.36N 118.39W
04/21/2010 E0.0 INCH INYO CA MESONET

A TRACE OF SNOW ON THE GROUND IN BISHOP AT AN ELEVATION
OF 4140 FEET WAS REPORTED BY THE BISHOP COCORAHS
OBSERVER.

0700 AM SNOW 1 SW PIOCHE 37.93N 114.46W
04/21/2010 M0.2 INCH LINCOLN NV MESONET

THE PIOCHE COCORAHS OBSERVER MEASURED 0.2 OF SNOW
OVERNIGHT AT AN ELEVATION OF 6241 FEET OVERNIGHT.

0700 AM SNOW GOLDFIELD 37.70N 117.23W
04/21/2010 E0.5 INCH ESMERALDA NV LAW ENFORCEMENT

THE ESMERALDA COUNTY SHERIFF REPORTED 0.5 INCH OF SNOW
FELL THIS MORNING IN GOLDFIELD AT AN ELEVATION OF 5690
FEET.

0800 AM SNOW 1 E DYER 37.62N 118.01W
04/21/2010 M4.0 INCH ESMERALDA NV CO-OP OBSERVER

THE DYER CO-OP OBSERVER MEASURED 4.0 INCHES OF SNOW
OVERNIGHT AT AN ELEVATION OF 4900 FEET.

0830 AM SNOW 4 WSW LIDA 37.43N 117.56W
04/21/2010 E5.0 INCH ESMERALDA NV LAW ENFORCEMENT

LIDA PASS RECEIVED 5.0 INCHES OF SNOW SINCE AROUND 4 AM
TODAY AT AN ELEVATION OF 7100 FEET. PLOWS WERE CALLED OUT
TO CLEAN STATE ROUTE 266. THE START TIME OF THIS EVENT
WAS ESTIMATED BASED ON SATELLITE IMAGERY.

0900 AM SNOW 4 WNW MT. CHARLESTON 36.30N 115.68W
04/21/2010 M2.1 INCH CLARK NV TRAINED SPOTTER

THE LAS VEGAS SKI AND SNOWBOARD RESORT AT LEE CANYON ON
MOUNT CHARLESTON REPORTED 2.1 INCHES OF NEW SNOW
OVERNIGHT AT AN ELEVATION OF 9360 FEET.

0918 AM SNOW 1 WNW ASPENDELL 37.24N 118.60W
04/21/2010 E6.0 INCH INYO CA TRAINED SPOTTER

A SPOTTER REPORTED AN ADDITIONAL 3 INCHES OF SNOW FELL IN
ASPENDELL OVERNIGHT AT AN ELEVATION OF AROUND 8500 FEET
BRINGING THE TOTAL SNOW SINCE 9 AM TUESDAY TO 6 INCHES OF
SNOW.

&&
SNOW REPORTS FROM ACROSS THE AREA OVERNIGHT.
$$

STACHELSKI

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KMFR [211652]: Preliminary Local Storm Report

NWUS56 KMFR 211652
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
952 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0900 AM HEAVY SNOW 12 N BONANZA 42.37N 121.41W
04/21/2010 M6.0 INCH KLAMATH OR PUBLIC

NEW SNOW FROM 11PM PDT LAST NIGHT THROUGH 9AM PDT THIS
MORNING. LOCATION IS 1 MILE NORTH OF BLY MOUNTAIN. WIND
GUSTS TO 20 MPH.

&&

$$

LUTZ

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KKEY [211651]: Preliminary Local Storm Report

NWUS52 KKEY 211651
LSRKEY

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KEY WEST FL
1251 PM EDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1226 PM WATER SPOUT 25 E MARATHON 24.71N 80.68W
04/21/2010 GMZ053 FL AIRPLANE PILOT

WFO MIAMI RELAYED REPORT FROM CWSU MIAMI OF A REPORTED
WATERSPOUT REPORTED BY PILOT.

&&

$$

MPARKE

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DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 211646
SWODY2
SPC AC 211645

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1145 AM CDT WED APR 21 2010

VALID 221200Z - 231200Z

...THERE IS A SLGT RISK OF SVR TSTMS ACROSS PARTS OF THE CNTRL AND
SRN PLAINS...

...SOUTHERN/CENTRAL PLAINS...

STRONG UPPER TROUGH APPEARS TO BE HANDLED WELL BY EARLY MORNING
MODEL GUIDANCE. BROAD H5 CIRCULATION IS FORECAST TO SHIFT INTO THE
CNTRL/SRN ROCKIES REGION BY THE END OF THE PERIOD...WITH A BIMODAL
STRUCTURE EXPECTED TO EVOLVE BY 23/12Z. ONE SIGNIFICANT PIECE OF
THIS TROUGH SHOULD EJECT INTO THE HIGH PLAINS DURING THE LATTER HALF
OF THE PERIOD WHILE STRONG FLOW PERSISTS ACROSS NRN MEXICO
MAINTAINING A SECONDARY CIRCULATION OVER SRN AZ. THE LEAD EXIT
REGION OF H5 SPEED MAX SHOULD ENCOURAGE LEE SURFACE CYCLOGENESIS
OVER CO WHICH WILL MAINTAIN BACKED ESELY LOW LEVEL FLOW ACROSS THE
CNTRL HIGH PLAINS. IN ALL LIKELIHOOD THE TRAILING DRYLINE SHOULD
NOT SURGE EWD TO ANY GREAT DEGREE...ULTIMATELY MIXING TO NEAR THE
CAP ROCK OVER THE TX PANHANDLE AS STRONG HEATING REMAINS CONFINED TO
HIGHER TERRAIN. IN RESPONSE TO THE NRN MEXICO SPEED MAX IT APPEARS
THE DRYLINE MAY ACTUALLY RETREAT ACROSS THE EDWARDS PLATEAU DURING
THE EVENING HOURS.

LATEST THINKING IS A NARROW AXIS OF HIGHER BOUNDARY LAYER MOISTURE
AND SUBSEQUENT ZONE OF MODEST INSTABILITY WILL DEVELOP JUST EAST OF
THE DRYLINE FROM SWRN TX...NWD INTO WRN KS AND PERHAPS A SMALL ZONE
OF ECNTRL CO BY PEAK HEATING. WHILE EARLY MORNING WARM ADVECTION
MAY DRIVE THUNDERSTORM CLUSTERS ACROSS CO/KS/NRN OK...STRONG DIURNAL
HEATING AND CONVERGENCE ALONG THE DRYLINE SHOULD PROVE ADEQUATE FOR
ISOLATED SUPERCELL DEVELOPMENT WITHIN STRONGER INSTABILITY. EWD
MOVEMENT OFF THE DRYLINE SHOULD ALLOW CLOUD BASES TO LOWER
SUFFICIENTLY FOR POTENTIAL TORNADIC DEVELOPMENT WITHIN STRONGLY
SHEARED ENVIRONMENT. IN ADDITION...VERY LARGE HAIL MAY ALSO
ACCOMPANY THE STRONGEST UPDRAFTS ALONG THE ERN PLUME OF STEEPER
LAPSE RATES. MODELS SUGGEST LARGE SCALE ASCENT WITHIN ENTRANCE
REGION OF PLAINS SPEED MAX MAY CONTRIBUTE GREATLY TO UPWARD GROWTH
OF CONVECTION ALONG THE DRYLINE FROM NW OF SJT...NEWD INTO OK AFTER
DARK. THIS ACTIVITY MAY EVOLVE INTO AN MCS...AIDED IN PART DUE TO
INCREASING LLJ...AS IT SPREADS ACROSS THE SRN PLAINS DURING THE
OVERNIGHT HOURS.

..DARROW.. 04/21/2010

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KMFR [211623]: Preliminary Local Storm Report

NWUS56 KMFR 211623
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
923 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0700 AM HEAVY RAIN 1 SSE ASHLAND 42.18N 122.69W
04/21/2010 M1.20 INCH JACKSON OR TRAINED SPOTTER

24 HOUR RAINFALL TOTAL SINCE 7AM PDT. CURRENTLY SNOWING
LIGHTLY.

0800 AM HEAVY RAIN 4 SSW APPLEGATE 42.21N 123.19W
04/21/2010 M0.79 INCH JACKSON OR TRAINED SPOTTER

48 HOUR RAINFALL TOTAL ENDING AT 8AM PDT.

0815 AM HEAVY SNOW SSE MOUNT SHASTA 41.32N 122.31W
04/21/2010 M4.5 INCH SISKIYOU CA TRAINED SPOTTER

SNOWFALL OVER THE LAST 3 HOURS. NW WIND WITH BLOWING
SNOW.

0830 AM HEAVY SNOW 1 W MOUNT SHASTA 41.32N 122.34W
04/21/2010 M6.0 INCH SISKIYOU CA TRAINED SPOTTER

LOCATION IS WEST OF MOUNT SHASTA. NEW SNOW SINCE ABOUT
5AM PDT THIS MORNING. POWER IS OUT.

0830 AM HEAVY SNOW 2 NE VALLEY FALLS 42.36N 120.25W
04/21/2010 M4.0 INCH LAKE OR PUBLIC

NEW SNOW OVERNIGHT. 4285 FOOT ELEVATION. SNOWING HARD AND
CONTINUOUSLY.

0830 AM HEAVY SNOW ESE MOUNT SHASTA 41.32N 122.31W
04/21/2010 M5.5 INCH SISKIYOU CA TRAINED SPOTTER

5 TO 6 INCHES OF HEAVY SNOW OBSERVED SINCE EARLY THIS
MORNING. NORTH WIND GUSTS TO 30 MPH. BLOWING SNOW. 31
DEGREES FAHRENHEIT.

0900 AM HEAVY SNOW 18 E EAGLE POINT 42.47N 122.45W
04/21/2010 M7.5 INCH JACKSON OR PUBLIC

TIGER SANCTUARY ON HIGHWAY 140. ELEVATION 3450 FEET. NEW
SNOW OVERNIGHT THROUGH THIS MORNING.

&&

$$

LUTZ

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 211616
SWODY1
SPC AC 211615

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1115 AM CDT WED APR 21 2010

VALID 211630Z - 221200Z

...THERE IS A SLGT RISK OF SVR TSTMS THIS AFTERNOON INTO EARLY
TONIGHT FROM EXTREME NW TX INTO SE CO...

...THERE IS A SLGT RISK OF SVR TSTMS THROUGH LATE EVENING FOR
UT...WRN CO...SE ID...SW WY...

...SE TX PANHANDLE TO SE CO THIS AFTERNOON THROUGH EARLY TONIGHT...
LOW-LEVEL MOISTURE IS RETURNING NWD ACROSS W/NW TX WITH BOUNDARY
LAYER DEWPOINTS NOW IN THE MID-UPPER 50S INTO THE PVW-ABI-SPS
AREA...AND A SLOW INCREASE IS EXPECTED THIS AFTERNOON WITH CONTINUED
MOISTURE ADVECTION AND LATENT HEAT FLUX FROM THE MOIST GROUND.
MEANWHILE...CLOUD EROSION AND DAYTIME HEATING FROM S TO N WILL
CONTRIBUTE TO DIFFERENTIAL HEATING AND HELP CONSOLIDATE A
SLOW-MOVING WARM FRONT ALONG THE CAO-AMA-CDS-SPS CORRIDOR...ROUGHLY
ALONG THE RED RIVER INTO PALO DURO CANYON. THIS SURFACE BOUNDARY
WILL SERVE TO FOCUS THUNDERSTORM DEVELOPMENT AS CONVECTIVE
INHIBITION WEAKENS THIS AFTERNOON.

MODERATE INSTABILITY /MLCAPE OF 1000-2000 J PER KG/ IS EXPECTED THIS
AFTERNOON ALONG THE FRONT AND E OF A DIFFUSE DRYLINE. THIS
INSTABILITY...IN COMBINATION WITH A GRADUAL INCREASE IN LOW-MIDLEVEL
FLOW...WILL CONTRIBUTE TO AN ENVIRONMENT FAVORABLE FOR SUPERCELLS
THIS AFTERNOON INTO EARLY TONIGHT...ESPECIALLY IN THE AREA BETWEEN
PVW-AMA-CDS. FORECAST HODOGRAPHS SHOW FAVORABLE VERTICAL WIND SHEAR
FOR PERSISTENT STORMS...AND AN INCREASE IN LOW-LEVEL SHEAR LATE THIS
EVENING WITH A DEVELOPING 25-35 KT SLY/SSELY LLJ. A COUPLE OF
TORNADOES...LARGE HAIL...AND ISOLATED DAMAGING WINDS WILL ALL BE
POSSIBLE FROM MID-LATE AFTERNOON THROUGH AT LEAST EARLY TONIGHT.

FARTHER NW INTO SE CO...LOW-LEVEL UPSLOPE FLOW WILL DRAW UPPER 40S
TO LOWER 50S BOUNDARY LAYER DEWPOINTS NWWD...AND A FEW CLOUD BREAKS
WILL ALLOW SURFACE HEATING IMMEDIATELY E OF THE MOUNTAINS.
THUNDERSTORMS WILL LIKELY DEVELOP THIS AFTERNOON OVER THE HIGH
TERRAIN IN CO AND THEN SPREAD SEWD ALONG THE BAROCLINIC ZONE NEAR
THE RATON MESA. THOUGH INSTABILITY WILL BE WEAKER COMPARED TO AREAS
FARTHER SE IN THE TX PANHANDLE...VERTICAL SHEAR WILL BE SUFFICIENT
FOR SUPERCELLS CAPABLE OF PRODUCING AT LEAST ISOLATED LARGE HAIL AND
DAMAGING GUSTS. OVERNIGHT...CLUSTERS OF ELEVATED THUNDERSTORMS WILL
CONTINUE AND SPREAD EWD/NEWD ACROSS WRN/NRN OK INTO KS IN
ASSOCIATION WITH LOW-LEVEL WAA.

...GREAT BASIN THROUGH LATE EVENING...
A STRONG MIDLEVEL LOW AND ASSOCIATED COLD FRONT WILL CONTINUE TO
MOVE SLOWLY EWD ACROSS UT/AZ THROUGH EARLY TONIGHT. A FOCUSED BELT
OF ASCENT ALONG THE FRONT...COMBINED WITH 7-8 C/KM MIDLEVEL LAPSE
RATES AND STEEPENING LOW-LEVEL LAPSE RATES WITH DAYTIME
HEATING...WILL SUPPORT A BAND OF THUNDERSTORMS WHICH WILL SPREAD EWD
ACROSS UT/SE ID INTO SW WY/WRN CO THROUGH THIS EVENING. THOUGH
INSTABILITY WILL NOT BE PARTICULARLY STRONG...SUBSTANTIAL DEEP-LAYER
SLY SHEAR AND INVERTED-V PROFILES IN THE LOW LEVELS WILL SUPPORT
EMBEDDED BOWING SEGMENTS AND/OR ROTATING STORMS WITH THE POTENTIAL
FOR A FEW DAMAGING GUSTS.

..THOMPSON/ROGERS.. 04/21/2010

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KMFR [211526]: Preliminary Local Storm Report

NWUS56 KMFR 211526
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
826 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0825 AM HEAVY SNOW 4 SW WEED 41.37N 122.42W
04/21/2010 M7.0 INCH SISKIYOU CA TRAINED SPOTTER

STILL SNOWING MODERATELY. WATER CONTENT WAS 0.83 INCHES.
ELEVATION 4100 FEET.

&&

$$

SPILDE

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KPDT [211458]: Preliminary Local Storm Report

NWUS56 KPDT 211458
LSRPDT

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PENDLETON OR
758 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0753 AM SNOW 7 SW LA PINE 43.61N 121.62W
04/21/2010 M2.0 INCH DESCHUTES OR TRAINED SPOTTER

SNOWING CURRENTLY. STIFF NORTHWEST WIND AT 15 KT.
CURRENTLY 2 INCHES. CURRENTLY 29 DEGREES. ELEVATION 4250
FEET.

&&

$$

RQB

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KMFR [211456]: Preliminary Local Storm Report

NWUS56 KMFR 211456
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
756 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0636 AM SNOW 3 E KLAMATH FALLS 42.23N 121.72W
04/21/2010 M5.0 INCH KLAMATH OR TRAINED SPOTTER

STILL SNOWING HARD WITH 20 MPH WINDS.

0703 AM SNOW N TENNANT 41.59N 121.91W
04/21/2010 M7.0 INCH SISKIYOU CA TRAINED SPOTTER

SNOWING SINCE MIDNIGHT. CURRENTLY 21 DEGREES.

0703 AM SNOW 1 W MOUNT SHASTA 41.32N 122.34W
04/21/2010 M3.0 INCH SISKIYOU CA TRAINED SPOTTER

STILL SNOWING HARD.

0721 AM SNOW 1 SSW KENO 42.11N 121.93W
04/21/2010 M4.0 INCH KLAMATH OR TRAINED SPOTTER

SNOWING SINCE LAST NIGHT. WIND 8-10 MPH.

&&

$$

WOODHEAD

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KREV [211449]: Preliminary Local Storm Report

NWUS55 KREV 211449
LSRREV

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RENO NV
748 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0747 AM SNOW 5 ENE CISCO 39.32N 120.45W
04/21/2010 M5.5 INCH NEVADA CA TRAINED SPOTTER

24-HR SNOWFALL IN KINGVALE.

&&

$$

SSNYDER

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KHNX [211400]: Preliminary Local Storm Report

NWUS56 KHNX 211400
LSRHNX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY CA
700 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0605 AM SNOW 18 SE PORTERVILLE 35.88N 118.80W
04/21/2010 E7.0 INCH TULARE CA LAW ENFORCEMENT

AT THE INTERSECTION OF PINE FLAT DRIVE AND MANTER MEADOW
ROAD.

0627 AM SNOW TEHACHAPI 35.13N 118.44W
04/21/2010 E2.0 INCH KERN CA BROADCAST MEDIA

1 TO 2 INCHES OF SNOW IN TEHACHAPI.

&&

$$

SANGER

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KSLC [211337]: Preliminary Local Storm Report

NWUS55 KSLC 211337
LSRSLC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
737 AM MDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0405 PM NON-TSTM WND GST 20 E CALLAO 39.90N 113.34W
04/20/2010 M59.00 MPH TOOELE UT MESONET

FISH SPRINGS SITE

1145 PM NON-TSTM WND GST 1 N WENDOVER 40.75N 114.02W
04/20/2010 M64.00 MPH TOOELE UT MESONET

WENDOVER PEAK SITE

0600 AM TSTM WND GST 18 ESE LAKESIDE 41.07N 112.59W
04/21/2010 M60.00 MPH BOX ELDER UT MESONET

HAT ISLAND SITE

&&

$$

CRK

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KCHS [211331]: Preliminary Local Storm Report

NWUS52 KCHS 211331
LSRCHS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
931 AM EDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0924 AM WATER SPOUT 2 E ISLE OF PALMS 32.79N 79.76W
04/21/2010 AMZ350 SC LAW ENFORCEMENT

LAW ENFORCEMENT REPORTED A WATER SPOUT 2 TO 3 MILES OFF
THE ISLE OF PALMS COAST FROM 5TH AVENUE.

&&

$$

DPB

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 211238
SWODY1
SPC AC 211236

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0736 AM CDT WED APR 21 2010

VALID 211300Z - 221200Z

...THERE IS A SLGT RISK OF SVR TSTMS LATE THIS AFTN AND EVE ACROSS
PARTS OF THE CENTRAL AND SOUTHERN HIGH PLAINS...

...SYNOPSIS...
A CLOSED LOW WITHIN THE SOUTHERN PORTION OF A SPLITTING UPPER TROUGH
NEAR THE PACIFIC COAST APPEARS LIKELY TO BECOME INCREASINGLY CUT-OFF
FROM STRONGER WESTERLIES TODAY. ONLY A SLOW EASTWARD MIGRATION
ACROSS THE SOUTHERN SIERRA NEVADA INTO THE GREAT BASIN IS
EXPECTED...MAINLY IN RESPONSE TO SHORT WAVE PERTURBATIONS PIVOTING
AROUND ITS CIRCULATION CENTER. AS THIS OCCURS...MODELS GENERALLY
INDICATE THAT DOWNSTREAM SHORT WAVE RIDGING WILL SHIFT EAST OF THE
SOUTHERN ROCKIES...THROUGH THE CENTRAL AND SOUTHERN HIGH PLAINS BY
12Z THURSDAY. GRADUAL MID-LEVEL HEIGHT RISES ARE ALSO PROGGED EAST
OF THE LOWER MISSISSIPPI VALLEY THROUGH THE SOUTHEAST STATES...BUT A
COOL CYCLONIC MID/UPPER FLOW REGIME WILL PERSIST ACROSS MUCH OF
EASTERN CANADA AND THE EASTERN U.S...TO THE SOUTHEAST OF A PROMINENT
BLOCKING RIDGE.

IN RESPONSE TO THE EVOLVING UPPER PATTERN...A SIGNIFICANT COLD FRONT
IS EXPECTED TO ADVANCE EAST OF THE WASATCH AND LOWER COLORADO VALLEY
THROUGH THE REMAINDER OF THE CENTRAL/SOUTHERN GREAT BASIN. WHILE
SURFACE TROUGHING SLOWLY DEEPENS TO THE LEE OF THE ROCKIES...A
LOW-LEVEL BAROCLINIC ZONE IS EXPECTED TO BECOME BETTER DEFINED
ACROSS SOUTHEAST COLORADO INTO NORTHWEST TEXAS...AS STRONG HEATING
OCCURS ACROSS THE HIGH PLAINS TO THE SOUTH AND WEST OF IT BY LATE
AFTERNOON. AT THE SAME TIME...A RETURN FLOW OF MOISTURE APPEARS
LIKELY TO CONTINUE DEVELOPING ACROSS THE SOUTHERN PLAINS ...BUT
SURFACE DEW POINTS HIGHER THAN THE LOWER 60S MAY NOT ADVECT NORTH OF
THE LOWER RIO GRANDE VALLEY UNTIL TOMORROW.

...CENTRAL/SOUTHERN HIGH PLAINS...
21/03Z SREF GUIDANCE INDICATES MORE UNCERTAINTY CONCERNING SEVERE
POTENTIAL THAN EARLIER RUNS...PERHAPS DUE TO THE INFLUENCE OF WEAK
MID/UPPER SUPPORT FOR UPWARD VERTICAL MOTION...AND THE PRESENCE OF
CONSIDERABLE LOWER/MID TROPOSPHERIC INHIBITION. MOISTURE
CONVERGENCE AND DAYTIME HEATING NEAR THE DEVELOPING LOW-LEVEL
BAROCLINIC ZONE ARE STILL PROGGED TO CONTRIBUTE TO MODERATE CAPE OF
1000-2000 J/KG. AND...DESPITE FLOW FIELDS RATHER MODEST IN
STRENGTH...VEERING PROFILES FROM EASTERLY AND SOUTHERLY AT
LOW-LEVELS TO WESTERLY AT MID-LEVELS WILL PROBABLY PROVIDE
SUFFICIENT SHEAR FOR SUPERCELLS.

AT LEAST ISOLATED TO WIDELY SCATTERED LATE AFTERNOON STORM
DEVELOPMENT STILL SEEMS PROBABLE...BUT HIGHEST PROBABILITIES PRIOR
TO NIGHTFALL MAY BE IN FAVORABLE LOW-LEVEL UPSLOPE FLOW ACROSS
SOUTHEAST COLORADO...BENEATH MORE STRONGLY DIFLUENT AND DIVERGENT
UPPER FLOW. POTENTIAL FOR BOUNDARY LAYER BASED STORMS MAY INCREASE
FOR A PERIOD THIS EVENING ACROSS THE TEXAS/OKLAHOMA PANHANDLE
REGION...NEAR THE NOSE OF A NOCTURNALLY STRENGTHENING LOW-LEVEL JET.
THEREAFTER...AS THE BOUNDARY LAYER ALONG AND SOUTH OF THE FRONTAL
ZONE COOLS AND STABILIZES...STORM DEVELOPMENT ROOTED IN AN ELEVATED
WARM ADVECTION REGIME...NORTH OF THE FRONT INTO THE CENTRAL
PLAINS...IS EXPECTED. THIS MAY PERSIST AND SPREAD EAST
NORTHEASTWARD THROUGH THE NIGHT...PERHAPS WITH INSTABILITY
SUFFICIENT FOR A CONTINUING RISK FOR HAIL...BUT POTENTIAL FOR
DAMAGING WIND GUSTS APPEARS LOW AT THE PRESENT TIME.

...GREAT BASIN...
STRONG FORCING FOR UPWARD VERTICAL MOTION TO THE NORTHEAST OF THE
CLOSED LOW MAY SUPPORT AN EVOLVING FRONTAL/PRE-FRONTAL BAND OF
STORMS NEAR THE WASATCH AS EARLY AS LATE MORNING...BEFORE DEVELOPING
NORTH/NORTHEASTWARD INTO THE UPPER SNAKE VALLEY AND WESTERN WYOMING.
ADDITIONAL STORMS THEN APPEAR POSSIBLE AHEAD OF THE COLD FRONT
ACROSS EASTERN UTAH LATER THIS AFTERNOON. SOMEWHAT WEAK BOUNDARY
LAYER WARMING...PARTICULARLY WITHIN THE STRONGER MEAN FLOW NEAR THE
UPPER JET AXIS ACROSS UTAH...MAY BE A LIMITING FACTOR TO THE
POTENTIAL FOR STRONG/SEVERE STORMS. BUT...SUB-CLOUD TEMPERATURE/DEW
POINT SPREADS MAY STILL BECOME LARGE ENOUGH TO CONTRIBUTE TO THE
RISK FOR AT LEAST LOCALIZED STRONG GUSTS WITH THE MOST VIGOROUS
CONVECTION.

..KERR/STOPPKOTTE.. 04/21/2010

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KMLB [210905]: Preliminary Local Storm Report

NWUS52 KMLB 210905
LSRMLB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MELBOURNE FL
504 AM EDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0457 AM HAIL 2 N PALM SHORES 28.22N 80.66W
04/21/2010 E0.25 INCH AMZ552 FL NWS EMPLOYEE

&&

$$

RL

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DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 210849
SWOD48
SPC AC 210848

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0348 AM CDT WED APR 21 2010

VALID 241200Z - 291200Z

...DISCUSSION...
MEDIUM-RANGE MODELS CONTINUE TO SHIFT A LARGE UPPER SYSTEM EWD
ACROSS THE CENTRAL AND ERN U.S. WITH TIME...WITH A GRADUAL
WEAKENING/DEAMPLIFICATION OF THE SYSTEM PROGGED. AS THE SYSTEM
BEGINS TO OPEN/WEAKEN -- PARTICULARLY FROM DAY 5 /SUN. APR. 25/
ONWARD...MODEL AGREEMENT SLOWLY DECREASES AS WELL. WHILE ENHANCED
SEVERE POTENTIAL WILL LIKELY SPREAD ACROSS THE SERN U.S. UNTIL THE
MAIN SURFACE FRONT MOVES OFFSHORE ON OR AROUND DAY 7 /TUE. APR.
27/...CONFIDENCE WITH RESPECT TO TIMING AND LOCATION DECREASES
STEADILY INTO THE PERIOD.

ATTM...WILL MAINTAIN AN OUTLOOK AREA CENTERED INVOF THE MID AND
LOWER MS AND TN VALLEYS DAY 4 /SAT. APR. 24/...AS A STRONGER
SHORT-WAVE TROUGH EMBEDDED WITHIN THE CYCLONIC FLOW AROUND THE MAIN
UPPER LOW IS PROGGED TO SHIFT ACROSS THIS REGION. WITH STRONG
DEEP-LAYER WIND FIELD AND MOIST/LIKELY UNSTABLE AIRMASS IN PLACE
AHEAD OF THIS FEATURE AND ASSOCIATED SURFACE FRONT...WIDESPREAD
SEVERE WEATHER APPEARS LIKELY.

AGAIN -- WHILE AT LEAST SOME SEVERE THREAT SHOULD SHIFT STEADILY EWD
WITH TIME DAYS 5-6-7...MODEL DIFFERENCES PRECLUDE HIGHLIGHTING
SPECIFIC THREAT AREAS BEYOND DAY 4.

..GOSS.. 04/21/2010

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DAY3SVR: Nws Storm Prediction Center Norman Ok

ACUS03 KWNS 210731
SWODY3
SPC AC 210730

DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0230 AM CDT WED APR 21 2010

VALID 231200Z - 241200Z

...THERE IS A SLGT RISK OF SVR TSTMS ACROSS A LARGE PORTION OF THE
CENTRAL AND S CENTRAL CONUS...

...SYNOPSIS...
LARGE WRN U.S. UPPER STORM SYSTEM WILL CONTINUE MOVING EWD INTO THE
CENTRAL U.S. THIS PERIOD...ACCOMPANIED BY A SEASONABLY-STRONG
DEEP-LAYER WIND FIELD. AT THE SURFACE...A COMPLEX EVOLUTION IS
EXPECTED...BUT WILL INCLUDE A COLD FRONT SHIFTING EWD ACROSS THE
PLAINS AND A WARM FRONT MOVING NWD ACROSS THE MID MS/MID MO VALLEY
REGION.

...MID MO/MID MS VALLEYS SWD TO THE WRN AND CENTRAL GULF COASTS...
ANOTHER DAY OF WIDESPREAD/POTENTIALLY SIGNIFICANT SEVERE WEATHER IS
FORECAST...COVERING THE CENTRAL U.S. FROM PARTS OF NEB/SRN IA/IL SWD
TO ERN TX/LA/MS...AHEAD OF THE EXPANSIVE UPPER SYSTEM AS IT
PROGRESSES EWD INTO THE CENTRAL CONUS. A COMPLEX SURFACE EVOLUTION
IS FORECAST -- THUS MAKING AREAS OF GREATEST SEVERE POTENTIAL
DIFFICULT TO DISCERN ATTM. OVERALL HOWEVER...IT APPEARS THAT
CONCENTRATED AREAS OF STORM DEVELOPMENT WILL EVOLVE BOTH
ALONG/AHEAD OF THE COLD FRONT AS IT CROSSES THE CENTRAL AND SRN
PLAINS...AND INVOF THE WARM FRONT WHICH SHOULD EXTEND ESEWD FROM NEB
INTO THE MID MS/TN VALLEY REGION DURING THE AFTERNOON AND EVENING.
WITH A LARGE MOIST/UNSTABLE WARM SECTOR IN PLACE AND WITH
STRONG/VEERING WIND FIELD WITH HEIGHT...EXPECT NUMEROUS
SEVERE/SUPERCELL STORMS -- PRIMARILY FROM EARLY AFTERNOON THROUGH
MID EVENING.

AGAIN -- WHILE DETAILED EVOLUTION CANNOT BE ASCERTAINED ATTM...IT
APPEARS THAT A RELATIVE TORNADO MAXIMUM MAY OCCUR INVOF THE WARM
FRONT -- I.E. ACROSS MO AND VICINITY...WHILE POTENTIAL FOR VERY
LARGE HAIL MAY BE MAXIMIZED FROM SERN OK SSWWD INTO THE HILL COUNTRY
AND ADJACENT PORTIONS OF SERN TX.

FARTHER E -- INTO THE LOWER AND MID MS VALLEY REGION -- THE IMPETUS
FOR STORM INITIATION WITHIN THE BROAD WARM SECTOR REMAINS MORE
UNCERTAIN. HOWEVER...GIVEN FAVORABLE KINEMATIC AND THERMODYNAMIC
ENVIRONMENT...WILL EXTEND THE SLIGHT RISK EWD ACROSS AR/TX AND INTO
WRN TN...MS...AND LA.

..GOSS.. 04/21/2010

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KHNX [210705]: Preliminary Local Storm Report

NWUS56 KHNX 210705
LSRHNX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY CA
1205 AM PDT WED APR 21 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0840 PM HAIL LAMONT 35.26N 118.91W
04/20/2010 E0.25 INCH KERN CA BROADCAST MEDIA

VIEWER REPORTS OF PEA-SIZE HAIL.

1127 PM HEAVY RAIN 8 N SPRINGVILLE 36.25N 118.82W
04/20/2010 M2.77 INCH TULARE CA MESONET

MILO RAWS. 24-HOUR TOTAL.

1149 PM HEAVY RAIN THREE RIVERS 36.44N 118.90W
04/20/2010 M2.09 INCH TULARE CA OFFICIAL NWS OBS

24-HOUR TOTAL. NWS-OWNED STATION.

&&

$$

SANGER

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KMFR [210646]: Preliminary Local Storm Report

NWUS56 KMFR 210646
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
1146 PM PDT TUE APR 20 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1143 PM HEAVY RAIN ESE MOUNT SHASTA 41.32N 122.31W
04/20/2010 E2.00 INCH SISKIYOU CA TRAINED SPOTTER

35 DEGREES AND MODERATE WET SNOW JUST STARTED.

&&

$$

STOCKTON

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DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 210601
SWODY2
SPC AC 210600

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0100 AM CDT WED APR 21 2010

VALID 221200Z - 231200Z

...THERE IS A SLGT RISK OF SVR TSTMS FROM ERN CO/WRN KS SWD ACROSS
MUCH OF W CENTRAL TX...

...SYNOPSIS...
LARGE UPPER LOW/TROUGH INITIALLY CENTERED OVER THE SRN GREAT BASIN
WILL SHIFT EWD ACROSS THE ROCKIES TOWARD THE CENTRAL U.S. THIS
PERIOD. MEANWHILE...TROUGH OVER THE NORTHEAST U.S. WILL TAKE ON A
MORE NEGATIVE TILT WITH TIME AS IT SHIFTS EWD TOWARD/INTO THE
ATLANTIC.

AT THE SURFACE...A COLD FRONT WILL CONTINUE CROSSING THE ROCKIES
AHEAD OF THE LARGE WRN SYSTEM...WITH LEE CYCLOGENESIS PROGGED OVER
THE CENTRAL HIGH PLAINS. A WARM FRONT WILL SHIFT NWD WITH TIME
ACROSS OK/AR/KS/MO...WHILE A DRYLINE MIXES EWD ACROSS THE HIGH
PLAINS THROUGH THE DAY -- EVENTUALLY TO BE OVERTAKEN BY THE
ADVANCING COLD FRONT. THE LARGE STORM SYSTEM MOVING INTO THE
CENTRAL U.S. WILL SUPPORT A RELATIVELY WIDESPREAD/
POTENTIALLY-SIGNIFICANT SEVERE WEATHER EVENT -- WHICH COULD REQUIRE
UPGRADE TO MODERATE RISK IN LATER FORECASTS AS UNCERTAINTY
DECREASES.

...ERN CO/WRN KS SWD INTO W CENTRAL TX...
PRIMARILY ELEVATED SHOWERS AND THUNDERSTORMS SHOULD BE ONGOING
ACROSS PARTS OF KS/OK AND EWD INTO SRN MO/NRN AR EARLY...INVOF A
RETREATING WARM FRONT. LOCAL HEATING THROUGH THE MORNING MAY RESULT
IN POCKETS OF SLIGHTLY MORE FAVORABLE DESTABILIZATION INVOF THE
FRONT...WHERE DEWPOINTS NEAR 60 ARE EXPECTED. WITH MODERATE/VEERING
FLOW WITH HEIGHT...A FEW STRONGER/ISOLATED SEVERE STORMS WILL BE
POSSIBLE -- WITH EVEN A TORNADO NOT OUT OF THE QUESTION INVOF THE
WARM FRONT WHERE SELY/ESELY LOW-LEVEL WINDS SHOULD ENHANCE LOW-LEVEL
SHEAR.

THE ONGOING CONVECTION MAY PROVE TO BE A COMPLICATING FACTOR FARTHER
W...PARTICULARLY ACROSS NRN PORTIONS OF THE RISK AREA INTO KS/ERN
CO. DEGREE OF HEATING ACROSS THIS PORTION OF THE THREAT AREA WILL
AFFECT THE DEGREE OF SEVERE POTENTIAL...BUT FOR NOW WILL KEEP
HIGHEST SEVERE PROBABILITY JUST S -- ACROSS THE ERN PANHANDLES AND
WRN OK AND SWD INTO TX ALONG THE EWD-MIXING DRYLINE.

AS THE DRYLINE SHIFTS EWD DURING THE DAY...HEATING OF THE MOISTENING
/LOW 60S DEWPOINTS/ BOUNDARY LAYER AWAY FROM ONGOING
CLOUDS/PRECIPITATION ALONG WITH STEEP MID-LEVEL LAPSE RATES WILL
CONTRIBUTE TO MODERATE DESTABILIZATION...WITH WIDESPREAD 1000 TO
1500 J/KG MIXED-LAYER CAPE EXPECTED BY MID AFTERNOON.

AS MID-LEVEL HEIGHT FALLS AHEAD OF THE ADVANCING UPPER SYSTEM SPREAD
EWD...LARGE-SCALE ASCENT -- FOCUSED NEAR THE DRYLINE -- SHOULD YIELD
THE DEVELOPMENT OF SCATTERED STORMS. WITH INCREASING SWLY MID-LEVEL
FLOW SPREADING EWD THROUGH THE DAY ATOP BOUNDARY-LAYER
SLYS/SELYS...SHEAR WILL BECOME QUITE FAVORABLE FOR SUPERCELLS --
SUGGESTING RAPID ACQUISITION OF ROTATING WITHIN THE DEVELOPING
STORMS. ALONG WITH THE THREAT FOR VERY LARGE
HAIL...LOCALLY-DAMAGING WINDS AND ISOLATED TORNADOES WILL ALSO BE
POSSIBLE. IF AMPLE HEATING/DESTABILIZATION CAN OCCUR INVOF THE SERN
CO SURFACE LOW AND EWD INTO SWRN KS/NWRN OK INVOF THE WARM
FRONT...MORE FAVORABLE SELYS JUST TO THE COOL SIDE OF THE FRONT
WOULD IMPLY GREATER TORNADO POTENTIAL FROM NERN CO/WRN KS INTO NWRN
OK AND PORTIONS OF THE PANHANDLES.

THREAT SHOULD SPREAD SLOWLY EWD THROUGH THE EVENING...AFFECTING OK
AND TX INTO THE OVERNIGHT HOURS. ELEVATED STORMS AND HAIL POTENTIAL
MAY SPREAD AS FAR N AS SRN NEB...AS A NOCTURNAL LOW-LEVEL JET
DEVELOPS FUELING INCREASED CONVECTION N OF THE WARM FRONT.

..GOSS.. 04/21/2010

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 210530
SWODY1
SPC AC 210528

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1228 AM CDT WED APR 21 2010

VALID 211200Z - 221200Z

...THERE IS A SLGT RISK OF SVR TSTMS THIS AFTERNOON AND EVENING OVER
PORTIONS OF THE CNTRL AND SRN HIGH PLAINS...

...SYNOPSIS...

AN INTENSE MID AND UPPER-LEVEL LOW CURRENTLY DIGGING SSEWD ALONG THE
CA COAST WILL UNDERGO FURTHER STRENGTHENING WHILE PROGRESSING SEWD
INTO THE GREAT BASIN AND LOWER CO VALLEY. THIS SYSTEM WILL BE
ACCOMPANIED BY A 100+ KT UPPER-LEVEL JET STREAK AND SIGNIFICANT
HEIGHT FALLS WHICH WILL SPREAD EWD THROUGH THE GREAT BASIN AND LOWER
CO VALLEY INTO THE CNTRL AND SRN ROCKIES THROUGH THE DAY ONE
PERIOD.

AT THE SURFACE...BROAD LEE CYCLOGENESIS IS FORECAST OVER THE CNTRL
AND SRN HIGH PLAINS TODAY...PRIOR TO CONSOLIDATION INTO A MORE
CONCENTRATED LOW CENTER OVER ERN CO TONIGHT. AS THIS PROCESS
OCCURS...A NW-SE ORIENTED BAROCLINIC ZONE IS EXPECTED TO STRENGTHEN
FROM SERN CO THROUGH THE OK/TX PNHDLS INTO THE RED RIVER VALLEY. A
WEAK DRYLINE OR LEE TROUGH WILL THEN EXTEND FROM THE INTERSECTION
WITH THIS FRONT SWD THROUGH WRN TX.

FARTHER W...A SURFACE LOW INITIALLY OVER WRN UT WILL DEEPEN WHILE
DEVELOPING NWD AND THEN NWWD INTO THE SNAKE RIVER VALLEY IN
CONJUNCTION WITH A STRONG VORTICITY MAXIMUM ROTATING AROUND THE
PARENT UPPER SYSTEM. MEANWHILE...TRAILING PACIFIC FRONT WILL SURGE
EWD THROUGH THE GREAT BASIN AND LOWER CO VALLEY INTO THE CNTRL AND
SRN ROCKIES.

...CNTRL AND SRN HIGH PLAINS...

THE DEEPENING LEE CYCLONE WILL ALLOW FOR THE NWD/NWWD FLUX OF AN
INCREASINGLY MOIST BOUNDARY LAYER WITH DEW POINTS INCREASING THROUGH
THE 50S FROM THE LOWER RIO GRANDE VALLEY INTO OK AND THE ERN OK/TX
PNHDLS. WHEN COUPLED WITH THE PRESENCE OF STEEP LAPSE RATES...THE
AFTERNOON AIR MASS OVER THE SLIGHT RISK AREA WILL BECOME MODERATELY
UNSTABLE WITH MLCAPE RANGING FROM AROUND 1000 J/KG OVER SERN CO TO
1500-2000 J/KG ACROSS THE ERN TX PNHDL AND NWRN TX INTO WRN OK.

00Z MESOSCALE MODEL GUIDANCE SUGGESTS THAT THE REGION WILL INITIALLY
RESIDE UNDER GRADUALLY BUILDING MIDLEVEL HEIGHTS DOWNSTREAM FROM
AMPLIFYING UPPER-LEVEL SYSTEM. HOWEVER...BY LATE AFTERNOON AND MORE
SO THIS EVENING...THE LEADING EDGE OF MORE MEANINGFUL HEIGHT FALLS
WILL BEGIN TO OVERSPREAD THE AREA FROM THE W. THIS PROCESS IN
CONJUNCTION WITH OROGRAPHIC UPSLOPE FLOW OVER SERN CO AND
CONVERGENCE ALONG THE ABOVE-MENTIONED SURFACE BOUNDARIES SHOULD
ALLOW FOR THE DEVELOPMENT OF ISOLATED TO SCATTERED DIURNAL STORMS
ACROSS THE SLIGHT RISK AREA.

SELY SURFACE WINDS VEERING TO WLY AT 25-35 KT IN THE MIDLEVELS WILL
RESULT IN 35-45 KT OF DEEP-LAYER SHEAR...SUFFICIENT FOR SUPERCELLS
GIVEN THE DEGREE OF INSTABILITY. SEVERE HAIL WILL BE THE PRIMARY
HAZARD WITH THESE STORMS AS THEY MATURE AND SLOWLY MOVE EWD/SEWD. A
TORNADO OR TWO IS POSSIBLE...ESPECIALLY WITH ANY SUPERCELLS THAT CAN
FAVORABLY INTERACT WITH PRE-EXISTING SURFACE BOUNDARIES -- MESOSCALE
OR SYNOPTIC. A MORE ROBUST TORNADO THREAT WILL LIKELY BE LIMITED BY
THE MARGINAL MOISTURE QUALITY WHICH WILL LEAD TO A STRENGTHENING CAP
LATER THIS EVENING WHEN THE LLJ AND NEAR-GROUND SHEAR ARE RAPIDLY
INTENSIFYING.

CLUSTERS OF MAINLY ELEVATED STORMS WILL LIKELY CONTINUE OVERNIGHT
ACROSS PARTS OF KS AND OK WITHIN A STRENGTHENING WAA REGIME
COINCIDENT WITH THE LLJ AXIS. THE STRONGER STORMS WILL BE CAPABLE
OF SOME HAIL WHICH MAY APPROACH SEVERE LEVELS.

...SNAKE RIVER VALLEY AND ERN PARTS OF THE GREAT BASIN INTO THE
CNTRL ROCKIES...

SIMILAR TO TUESDAY...STEEP LAPSE RATES...STRONG DYNAMIC FORCING AND
VERTICAL SHEAR MAY YIELD A FEW ORGANIZED STORMS ALONG THE PACIFIC
FRONT WITH THE PRIMARY SEVERE THREAT BEING DAMAGING WIND GUSTS.
THIS THREAT SHOULD BEGIN TO DIMINISH BY LATE EVENING AS THE BOUNDARY
LAYER COOLS AND STABILIZES.

..MEAD/SMITH.. 04/21/2010

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KMFR [210522]: Preliminary Local Storm Report

NWUS56 KMFR 210522
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
1022 PM PDT TUE APR 20 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1015 PM HEAVY RAIN 1 E ASHLAND 42.19N 122.68W
04/20/2010 M1.00 INCH JACKSON OR NWS EMPLOYEE

24 HR TOTAL ENDING 1015 PM.

&&

$$

STAVISH

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KVEF [210443]: Preliminary Local Storm Report...summary

NWUS55 KVEF 210443
LSRVEF

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE LAS VEGAS NV
943 PM PDT TUE APR 20 2010

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1130 AM NON-TSTM WND GST SIERRA ROTORS 15 36.74N 118.12W
04/20/2010 M55.00 MPH INYO CA MESONET

1140 AM NON-TSTM WND GST SIERRA ROTORS 03 36.79N 118.21W
04/20/2010 M55.00 MPH INYO CA MESONET

1142 AM NON-TSTM WND GST OAK CREEK RAWS 36.84N 118.26W
04/20/2010 M59.00 MPH INYO CA MESONET

THE OAK CREEK RAWS MEASURED A PEAK WIND GUST OF 59 MPH AT
AN ELEVATION OF 4900 FEET FROM THE SOUTH-SOUTHEAST.

1227 PM NON-TSTM WND GST ORIENTAL WASH RAWS 37.23N 117.50W
04/20/2010 M50.00 MPH ESMERALDA NV MESONET

0100 PM NON-TSTM WND GST SIERRA ROTORS 10 36.77N 118.16W
04/20/2010 M55.00 MPH INYO CA MESONET

0110 PM NON-TSTM WND GST BISHOP AIRPORT 37.37N 118.36W
04/20/2010 M55.00 MPH INYO CA ASOS

0130 PM NON-TSTM WND GST MERCURY (NTS A23) 36.66N 116.00W
04/20/2010 M54.00 MPH NYE NV MESONET

0149 PM NON-TSTM WND GST DESERT ROCK AIRPORT 36.62N 116.03W
04/20/2010 M51.00 MPH NYE NV ASOS

0200 PM NON-TSTM WND GST AREA 5 NORTH (NTS A13) 36.86N 115.96W
04/20/2010 M53.00 MPH NYE NV MESONET

0207 PM NON-TSTM WND GST BARSTOW-DAGGETT AP 34.85N 116.79W
04/20/2010 M49.00 MPH SAN BERNARDINO CA ASOS

0215 PM NON-TSTM WND GST REBOUND ANGLE ROAD (A41 37.02N 116.06W
04/20/2010 M52.00 MPH NYE NV MESONET

0230 PM NON-TSTM WND GST REBOUND MEDA (NTS A45) 37.01N 116.07W
04/20/2010 M49.00 MPH NYE NV MESONET

0235 PM NON-TSTM WND GST 1 N BULLHEAD CITY 35.16N 114.56W
04/20/2010 M46.00 MPH MOHAVE AZ AWOS

LAUGHLIN-BULLHEAD INTERNATIONAL AIRPORT MEASURED A PEAK
WIND GUST OF 46 MPH FROM THE SOUTH AT AN ELEVATION OF 696
FEET.

0241 PM NON-TSTM WND GST KANE SPRINGS RAWS 37.25N 114.71W
04/20/2010 M58.00 MPH LINCOLN NV MESONET

KANE SPRINGS RAWS MEASURED A PEAK WIND GUST OF 58 MPH
FROM THE SOUTH AT AN ELEVATION OF 4382 FEET.

0300 PM NON-TSTM WND GST MERCURY (NTS A23) 36.66N 116.00W
04/20/2010 M60.00 MPH NYE NV MESONET

THE MERCURY A23 SITE MEASURED A 60 MPH PEAK WIND GUST AT
AN ELEVATION OF 3676 FEET.

0300 PM DUST STORM SILVER PEAK 37.77N 117.47W
04/20/2010 ESMERALDA NV TRAINED SPOTTER

VISIBILITY IN SILVER PEAK WAS REDUCED TO ABOUT 100 FEET
DUE TO BLOWING DUST ASSOCIATED WITH A THUNDERSTORM.

0340 PM TSTM WND DMG LIDA 37.46N 117.50W
04/20/2010 ESMERALDA NV LAW ENFORCEMENT

A LARGE PINE TREE WAS BLOWN OVER BY WINDS, LIKELY FROM A
THUNDERSTORM, AND RESULTED IN THE TREE BLOCKING ROUTE 266
NEAR LIDA. 4 LIGHTNING STRIKES WERE NOTED IN THE AREA.

0345 PM SNOW 1 WNW ASPENDELL 37.24N 118.60W
04/20/2010 M4.0 INCH INYO CA TRAINED SPOTTER

A SPOTTER MEASURED 4.0 INCHES OF SNOW IN ASPENDELL AT AN
ELEVATION OF 8500 FEET. SNOW BEGAN TO FALL AROUND 900 AM
TODAY AND STARTED STICKING AROUND NOON. THE SPOTTER
REPORTED VERY LIGHT SNOW WAS STILL FALLING.

0350 PM LIGHTNING SILVER PEAK 37.77N 117.47W
04/20/2010 ESMERALDA NV TRAINED SPOTTER

LIGHTNING STRUCK A TRANSMISSION LINE RESULTING IN POWER
OUTAGES IN SILVER PEAK. THE TIME OF THIS EVENT IS
ESTIMATED BASED ON THE LIGHTNING DETECTION NETWORK.

0355 PM NON-TSTM WND GST FURNACE CREEK 36.45N 116.85W
04/20/2010 E50.00 MPH INYO CA PARK/FOREST SRVC

THE PARK SERVICE ESTIMATED WIND GUSTS OF 50 MPH ALONG
WITH BLOWING DUST REDUCING VISIBILITY TO 1/4 MILE IN THE
FURNACE CREEK AREA OF DEATH VALLEY NATIONAL PARK.

0400 PM NON-TSTM WND DMG GOLDFIELD 37.70N 117.23W
04/20/2010 ESMERALDA NV LAW ENFORCEMENT

GUSTY WINDS BLEW DOWN SOME POWER LINES IN GOLDFIELD AND
RESULTED IN POWER OUTAGES. THE PEAK WIND GUST AT THE
GOLDFIELD CEMP SITE WAS 46 MPH.

0400 PM SNOW 1 WNW ASPENDELL 37.24N 118.60W
04/20/2010 E3.0 INCH INYO CA TRAINED SPOTTER

A SPOTTER REPORTED AROUND 3 INCHES OF SNOW IN ASPENDELL
AT AN ELEVATION OF ABOUT 8500 FEET. DURING THE EARLY
AFTERNOON THE SNOW WAS ACCOMPANIED BY WIND GUSTS OF AT
LEAST 50 MPH CREATING NEAR WHITEOUT CONDITIONS AT TIMES.

0510 PM NON-TSTM WND GST RACHEL (CMP19) 37.64N 115.74W
04/20/2010 M47.00 MPH LINCOLN NV MESONET

0600 PM SNOW 10 WNW OWENS VALLEY RAW 37.45N 118.72W
04/20/2010 E7.6 INCH INYO CA MESONET

THE ROCK CREEK LAKES SNOTEL RECEIVED AN ESTIMATED 7.6
INCHES OF SNOW BETWEEN 800 AM AND 600 PM TODAY AT AN
ELEVATION OF 9700 FEET.

0600 PM SNOW 4 SSE ASPENDELL 37.18N 118.56W
04/20/2010 E7.6 INCH INYO CA MESONET

THE SOUTH LAKE SNOTEL RECEIVED AN ESTIMATED 7.6 INCHES OF
SNOW FROM 800 AM TODAY THROUGH 600 PM AT AN ELEVATION OF
9600 FEET.

0645 PM NON-TSTM WND GST 5 WNW PAHRUMP 36.22N 116.09W
04/20/2010 M52.00 MPH NYE NV MESONET

0741 PM NON-TSTM WND GST KANE SPRINGS RAWS 37.25N 114.71W
04/20/2010 M60.00 MPH LINCOLN NV MESONET

KANE SPRINGS RAWS MEASURED A 60 MPH WIND GUST FROM THE
SOUTH AT AN ELEVATION OF 4382 FEET.

0834 PM NON-TSTM WND GST RED ROCK CANYON RAWS 36.14N 115.43W
04/20/2010 M48.00 MPH CLARK NV MESONET

&&
WIND, SNOW AND THUNDERSTORM REPORTS SO FAR TODAY FROM ACROSS THE
AREA.
$$

STACHELSKI

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