KAMA [210312]: Preliminary Local Storm Report

NWUS54 KAMA 210312
LSRAMA

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
1012 PM CDT TUE APR 20 2010

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

0746 PM HAIL 7 N UMBARGER 35.06N 102.11W
04/20/2010 E1.75 INCH RANDALL TX AMATEUR RADIO

&&

EVENT NUMBER AMA1000332

$$

JOHNSON

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KCYS [210247]: Preliminary Local Storm Report

NWUS55 KCYS 210247
LSRCYS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
847 PM MDT TUE APR 20 2010

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

0845 PM HAIL 12 W WHEATLAND 42.05N 105.19W
04/20/2010 E0.25 INCH PLATTE WY TRAINED SPOTTER

&&

$$

HAHN

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KAMA [210232]: Preliminary Local Storm Report

NWUS54 KAMA 210232
LSRAMA

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
932 PM CDT TUE APR 20 2010

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

0710 PM HAIL 1 N BUSHLAND 35.20N 102.06W
04/20/2010 M1.75 INCH POTTER TX TRAINED SPOTTER

SPOTTER ALSO CONFIRMED THE TORNADO REPORTED NEAR
BUSHLAND

&&

EVENT NUMBER AMA1000331

$$

JOHNSON

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KAMA [210221]: Preliminary Local Storm Report

NWUS54 KAMA 210221
LSRAMA

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
921 PM CDT TUE APR 20 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

BRIEF TOUCHDOWN REPORTED APPROXIMATELY 3 MILES
NORTHEAST OF UMBARGER. PRELIMINARY POSITION PENDING
STORM SURVEY.

&&

EVENT NUMBER AMA1000330

$$

JOHNSON

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KBOI [210218]: Preliminary Local Storm Report

NWUS55 KBOI 210218
LSRBOI

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
818 PM MDT TUE APR 20 2010

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

0617 PM TSTM WND GST MOUNTAIN HOME AFB 43.05N 115.87W
04/20/2010 M54.00 MPH ELMORE ID MESONET

&&

$$

JSMITH

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KAMA [210217]: Preliminary Local Storm Report

NWUS54 KAMA 210217
LSRAMA

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
917 PM CDT TUE APR 20 2010

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

0704 PM TORNADO 5 W BUSHLAND 35.19N 102.15W
04/20/2010 OLDHAM TX AMATEUR RADIO

LOCATED APPROXIMATELY 1 MILE SOUTH OF INTERSTATE 40.
PRELIMINARY END TIME IS ESTIMATED.

&&

EVENT NUMBER AMA1000329

$$

JOHNSON

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KVEF [210158]: Preliminary Local Storm Report...corrected

NWUS55 KVEF 210158
LSRVEF

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

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

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.

&&

$$

STACHELSKI

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KVEF [210152]: Preliminary Local Storm Report...corrected

NWUS55 KVEF 210152
LSRVEF

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

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

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.

&&

$$

STACHELSKI

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KMFR [210151]: Preliminary Local Storm Report

NWUS56 KMFR 210151
LSRMFR

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

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

0600 PM HEAVY RAIN 2 WSW TALENT 42.23N 122.83W
04/20/2010 M0.68 INCH JACKSON OR TRAINED SPOTTER

24 HRS ENDING 6 PM

&&

$$

STAVISH

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KFFC [210149]: Preliminary Local Storm Report

NWUS52 KFFC 210149
LSRFFC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
948 PM EDT TUE APR 20 2010

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

0800 PM TSTM WND DMG 4 NE JACKSON 33.33N 83.91W
04/20/2010 BUTTS GA EMERGENCY MNGR

ONE POWER LINE DOWN.

&&

$$

JLF

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KVEF [210148]: Preliminary Local Storm Report

NWUS55 KVEF 210148
LSRVEF

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

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

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.

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.

&&

$$

STACHELSKI

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KAMA [210138]: Preliminary Local Storm Report...corrected

NWUS54 KAMA 210138
LSRAMA

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE AMARILLO TX
837 PM CDT TUE APR 20 2010

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

0748 PM TSTM WND GST 3 NE UMBARGER 34.99N 102.07W
04/20/2010 M68 MPH RANDALL TX BROADCAST MEDIA

SCHOOLNET REPORT FROM BRANDT FARMS

&&

CORRECTED EVENT TIME...REMARKS

EVENT NUMBER AMA1000327

$$

JOHNSON

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KAMA [210136]: Preliminary Local Storm Report

NWUS54 KAMA 210136
LSRAMA

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
835 PM CDT TUE APR 20 2010

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

0745 PM TSTM WND DMG UMBARGER 34.95N 102.11W
04/20/2010 RANDALL TX EMERGENCY MNGR

HOME WINDOWS BLOWN OUT IN UMBARGER

&&

EVENT NUMBER AMA1000328

$$

JOHNSON

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KAMA [210133]: Preliminary Local Storm Report

NWUS54 KAMA 210133
LSRAMA

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
833 PM CDT TUE APR 20 2010

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

0831 PM TSTM WND GST 3 NE UMBARGER 34.99N 102.07W
04/20/2010 M68 MPH RANDALL TX BROADCAST MEDIA

SCHOOLNET REPORT FROM BRANDT FARMS68

&&

EVENT NUMBER AMA1000327

$$

JOHNSON

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DAY1SVR: Day 1 Convective Outlook Corr 1

ACUS01 KWNS 210104
SWODY1
SPC AC 210103

DAY 1 CONVECTIVE OUTLOOK CORR 1
NWS STORM PREDICTION CENTER NORMAN OK
0803 PM CDT TUE APR 20 2010

VALID 210100Z - 211200Z

..NO SVR TSTM AREAS FORECAST...

CORRECTED FOR GEOGRAPHICAL REFERENCE

..WRN TX...

SUPERCELL W/SW OF AMA CONTINUES TO PROPAGATE SSEWD ALONG N-S
ORIENTED BAROCLINIC ZONE WITHIN A THERMODYNAMIC ENVIRONMENT
CHARACTERIZED BY STEEP LAPSE RATES AND MUCAPE OF AROUND 1000 J/KG.
WHILE THE WIND FIELD IS NOT PARTICULARLY STRONG...THE SWD STORM
PROPAGATION IS ENHANCING NEAR GROUND SRH WITHIN THE STORM INFLOW.
THE GRADUAL INTENSIFICATION OF A 35+ KT SLY LLJ SHOULD SERVE TO
ENHANCE MESOSCALE ASCENT ALONG DEVELOPING CONVECTIVE
OUTFLOWS...ALLOWING FOR A CONTINUATION OF ONGOING STORM CLUSTER
THROUGH THE SRN TX PNHDL...PERHAPS INTO PARTS OF THE S PLAINS AND
LOW ROLLING PLAINS. THE PRIMARY HAZARD WILL BE DAMAGING WIND
GUSTS...THOUGH HAIL AND PERHAPS A BRIEF TORNADO WILL REMAIN POSSIBLE
FOR THE NEXT HOUR OR TWO.

..ERN ORE/WRN ID...

AN ARCING BAND OF TSTMS HAS DEVELOPED THIS AFTERNOON FROM VICINITY
OF MIGRATORY SURFACE LOW W OF BOI SSEWD ALONG PACIFIC FRONT INTO
NERN NV. A PRONOUNCED PRESSURE RISE-FALL COUPLET ASSOCIATED WITH
THE SURFACE LOW IS INDICATIVE OF STRONG DYNAMIC FORCING FOR ASCENT
ATTENDANT TO A VIGOROUS SHORT WAVE TROUGH ROTATING AROUND PARENT
UPPER LOW INTO CNTRL NV. 00Z BOI SOUNDING IS LIKELY QUITE
REPRESENTATIVE OF THE AMBIENT ENVIRONMENT...FEATURING STEEP LAPSE
RATES AND A DEEPLY MIXED...INVERTED-V TYPE SUB-CLOUD PROFILE. THE
COMBINATION OF EVAPORATIVE COOLING EFFECTS AND DOWNWARD MOMENTUM
TRANSFER OF A STRONG WIND FIELD WILL CONTINUE TO FAVOR THE
DEVELOPMENT OF ISOLATED STRONG DOWNBURSTS THROUGH THE REMAINDER OF
THE EVENING.

.MEAD.. 04/21/2010

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 210101
SWODY1
SPC AC 210059

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0759 PM CDT TUE APR 20 2010

VALID 210100Z - 211200Z

..NO SVR TSTM AREAS FORECAST...

..WRN TX...

SUPERCELL W/SW OF AMA CONTINUES TO PROPAGATE SSEWD ALONG N-S
ORIENTED BAROCLINIC ZONE WITHIN A THERMODYNAMIC ENVIRONMENT
CHARACTERIZED BY STEEP LAPSE RATES AND MUCAPE OF AROUND 1000 J/KG.
WHILE THE WIND FIELD IS NOT PARTICULARLY STRONG...THE SWD STORM
PROPAGATION IS ENHANCING NEAR GROUND SRH WITHIN THE STORM INFLOW.
THE GRADUAL INTENSIFICATION OF A 35+ KT SLY LLJ SHOULD SERVE TO
ENHANCE MESOSCALE ASCENT ALONG DEVELOPING CONVECTIVE
OUTFLOWS...ALLOWING FOR A CONTINUATION OF ONGOING STORM CLUSTER
THROUGH THE SRN TX PNHDL...PERHAPS INTO PARTS OF THE S PLAINS AND
LOW ROLLING PLAINS. THE PRIMARY HAZARD WILL BE DAMAGING WIND
GUSTS...THOUGH HAIL AND PERHAPS A BRIEF TORNADO WILL REMAIN POSSIBLE
FOR THE NEXT HOUR OR TWO.

..ERN ORE/WRN WA...

AN ARCING BAND OF TSTMS HAS DEVELOPED THIS AFTERNOON FROM VICINITY
OF MIGRATORY SURFACE LOW W OF BOI SSEWD ALONG PACIFIC FRONT INTO
NERN NV. A PRONOUNCED PRESSURE RISE-FALL COUPLET ASSOCIATED WITH
THE SURFACE LOW IS INDICATIVE OF STRONG DYNAMIC FORCING FOR ASCENT
ATTENDANT TO A VIGOROUS SHORT WAVE TROUGH ROTATING AROUND PARENT
UPPER LOW INTO CNTRL NV. 00Z BOI SOUNDING IS LIKELY QUITE
REPRESENTATIVE OF THE AMBIENT ENVIRONMENT...FEATURING STEEP LAPSE
RATES AND A DEEPLY MIXED...INVERTED-V TYPE SUB-CLOUD PROFILE. THE
COMBINATION OF EVAPORATIVE COOLING EFFECTS AND DOWNWARD MOMENTUM
TRANSFER OF A STRONG WIND FIELD WILL CONTINUE TO FAVOR THE
DEVELOPMENT OF ISOLATED STRONG DOWNBURSTS THROUGH THE REMAINDER OF
THE EVENING.

.MEAD.. 04/21/2010

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KPUB [210021]: Preliminary Local Storm Report

NWUS55 KPUB 210021
LSRPUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
621 PM MDT TUE APR 20 2010

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

0603 PM HAIL 11 NW SPRINGFIELD 37.52N 102.76W
04/20/2010 E1.75 INCH BACA CO PUBLIC

&&

$$

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KCYS [210014]: Preliminary Local Storm Report

NWUS55 KCYS 210014
LSRCYS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
614 PM MDT TUE APR 20 2010

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

0613 PM HAIL GLENROCK 42.86N 105.86W
04/20/2010 E0.25 INCH CONVERSE WY EMERGENCY MNGR

PEA SIZE HAIL AN ESTIMATED 2 INCHES DEEP ON THE GROUND
SINCE THE HAIL BEGAN FALLING AT 6 PM.

&&

$$

LUNDQUIST

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KCYS [210005]: Preliminary Local Storm Report

NWUS55 KCYS 210005
LSRCYS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
605 PM MDT TUE APR 20 2010

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

0600 PM HAIL GLENROCK 42.86N 105.86W
04/20/2010 E0.25 INCH CONVERSE WY TRAINED SPOTTER

&&

$$

LUNDQUIST

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KBOI [210004]: Preliminary Local Storm Report

NWUS55 KBOI 210004
LSRBOI

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
604 PM MDT TUE APR 20 2010

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

0430 PM TSTM WND DMG 3 E BURNS 43.59N 119.00W
04/20/2010 HARNEY OR LAW ENFORCEMENT

7 POWER POLES DOWN ALONG US-78 BETWEEN MILE POST 19 AND
20.

0437 PM TSTM WND GST 14 S BURNS JUNCTION 42.58N 117.89W
04/20/2010 M62.00 MPH MALHEUR OR ASOS

&&

$$

JSMITH

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KPUB [210001]: Preliminary Local Storm Report

NWUS55 KPUB 210001
LSRPUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
600 PM MDT TUE APR 20 2010

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

0545 PM HAIL 7 NW SPRINGFIELD 37.49N 102.69W
04/20/2010 M0.75 INCH BACA CO TRAINED SPOTTER

&&

$$

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KLBF [202351]: Preliminary Local Storm Report

NWUS53 KLBF 202351
LSRLBF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
651 PM CDT TUE APR 20 2010

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

0616 PM HAIL 8 N WALLACE 40.95N 101.16W
04/20/2010 M0.50 INCH LINCOLN NE PUBLIC

LARGE PEA TO SMALL MARBLE SIZED HAIL REPORTED.

0623 PM HAIL KEYSTONE 41.22N 101.59W
04/20/2010 M0.50 INCH KEITH NE PUBLIC

PEA TO MARBLE SIZE HAIL OCCURRED IN KEYSTONE.

0643 PM HAIL OGALLALA 41.13N 101.72W
04/20/2010 M0.50 INCH KEITH NE PUBLIC

PEA TO SMALL MARBLE SIZED HAIL OCCURRED WITH THE GROUND
NEARLY ALL COVERED.

&&

$$

SJC

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KCYS [202348]: Preliminary Local Storm Report

NWUS55 KCYS 202348
LSRCYS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
548 PM MDT TUE APR 20 2010

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

0547 PM HAIL 15 N CHEYENNE 41.36N 104.79W
04/20/2010 E0.25 INCH LARAMIE WY NWS EMPLOYEE

HAIL FELL AT MILE MARKER 24 ON I-25.

&&

$$

LUNDQUIST

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KCYS [202345]: Preliminary Local Storm Report

NWUS55 KCYS 202345
LSRCYS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
544 PM MDT TUE APR 20 2010

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

0422 PM HAIL CHUGWATER 41.76N 104.82W
04/20/2010 E0.50 INCH PLATTE WY LAW ENFORCEMENT

TIME ESTIMATED REPORT.

0422 PM HAIL 28 N CHEYENNE 41.55N 104.79W
04/20/2010 E0.25 INCH LARAMIE WY NWS EMPLOYEE

0517 PM HAIL 5 SE BUFORD 41.06N 105.23W
04/20/2010 E0.25 INCH LARAMIE WY TRAINED SPOTTER

ACTUAL HAIL SIZE WAS 3/8 OF AN INCH. TIME ESTIMATED
REPORT.

&&

$$

LUNDQUIST

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KFFC [202330]: Preliminary Local Storm Report

NWUS52 KFFC 202330
LSRFFC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
729 PM EDT TUE APR 20 2010

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

0718 PM HAIL 3 E MCDONOUGH 33.45N 84.09W
04/20/2010 E1.00 INCH HENRY GA PUBLIC

&&

$$

20

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KPIH [202325]: Preliminary Local Storm Report

NWUS55 KPIH 202325
LSRPIH

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO
525 PM MDT TUE APR 20 2010

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

0520 PM NON-TSTM WND DMG 4 SE POCATELLO 42.84N 112.41W
04/20/2010 BANNOCK ID TRAINED SPOTTER

TRAINED SPOTTER REPORTS A FENCE WAS BEING BLOWN OVER

&&

$$

CHATTINGS

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KVEF [202321]: Preliminary Local Storm Report...summary

NWUS55 KVEF 202321
LSRVEF

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE LAS VEGAS NV
421 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

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 SNOW 4 SSE ASPENDELL 37.18N 118.56W
04/20/2010 E5.1 INCH INYO CA MESONET

THE SOUTH LAKE SNOTEL RECEIVED AN ESTIMATED 5.1 INCHES OF
SNOW FROM 800 AM TODAY THROUGH 300 PM AT AN ELEVATION OF
9600 FEET.

0300 PM SNOW 9 WSW ASPENDELL 37.18N 118.74W
04/20/2010 E5.6 INCH FRESNO CA MESONET

THE ROCK CREEK LAKES SNOTEL RECEIVED AN ESTIMATED 5.6
INCHES OF SNOW BETWEEN 800 AM AND 300 PM TODAY AT AN
ELEVATION OF 9700 FEET.

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.

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.

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

STACHELSKI

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KVEF [202255]: Preliminary Local Storm Report...summary

NWUS55 KVEF 202255
LSRVEF

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE LAS VEGAS NV
355 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

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 SNOW 9 WSW ASPENDELL 37.18N 118.74W
04/20/2010 E5.6 INCH FRESNO CA MESONET

THE ROCK CREEK LAKES SNOTEL RECEIVED AN ESTIMATED 5.6
INCHES OF SNOW BETWEEN 800 AM AND 300 PM TODAY AT AN
ELEVATION OF 9700 FEET.

0300 PM SNOW 4 SSE ASPENDELL 37.18N 118.56W
04/20/2010 E5.1 INCH INYO CA MESONET

THE SOUTH LAKE SNOTEL RECEIVED AN ESTIMATED 5.1 INCHES OF
SNOW FROM 800 AM TODAY THROUGH 300 PM AT AN ELEVATION OF
9600 FEET.

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.

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

STACHELSKI

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KAMA [202249]: Preliminary Local Storm Report

NWUS54 KAMA 202249
LSRAMA

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
549 PM CDT TUE APR 20 2010

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

0538 PM HAIL BOYS RANCH 35.51N 102.25W
04/20/2010 E0.75 INCH OLDHAM TX TRAINED SPOTTER

&&

EVENT NUMBER AMA1000326

$$

SFJ

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KPUB [202247]: Preliminary Local Storm Report

NWUS55 KPUB 202247
LSRPUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
447 PM MDT TUE APR 20 2010

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

0440 PM HAIL 4 SE COLORADO CITY 37.91N 104.79W
04/20/2010 M1.00 INCH PUEBLO CO TRAINED SPOTTER

&&

$$

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KPUB [202246]: Preliminary Local Storm Report

NWUS55 KPUB 202246
LSRPUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
446 PM MDT TUE APR 20 2010

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

0445 PM HAIL 4 SE COLORADO CITY 37.91N 104.79W
04/20/2010 M1.00 INCH PUEBLO CO TRAINED SPOTTER

&&

$$

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KLKN [202240]: Preliminary Local Storm Report

NWUS55 KLKN 202240
LSRLKN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ELKO NV
340 PM PDT TUE APR 20 2010

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

0213 PM NON-TSTM WND GST 9 ESE TONOPAH 38.06N 117.09W
04/20/2010 M63.00 MPH NYE NV ASOS

TONOPAH AIRPORT.

0230 PM TSTM WND GST 13 WNW KINGS RIVER VALL 41.80N 118.45W
04/20/2010 M60.00 MPH HUMBOLDT NV MESONET

TEXAS SPRING RAWS.

&&

$$

CEC

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KFFC [202240]: Preliminary Local Storm Report

NWUS52 KFFC 202240
LSRFFC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
639 PM EDT TUE APR 20 2010

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

0625 PM HAIL 3 W JONESBORO 33.53N 84.40W
04/20/2010 E1.00 INCH CLAYTON GA PUBLIC

&&

$$

20

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KHNX [202229]: Preliminary Local Storm Report

NWUS56 KHNX 202229
LSRHNX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY CA
327 PM PDT TUE APR 20 2010

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

1035 AM NON-TSTM WND DMG 4 WSW BAKERSFIELD 35.34N 119.07W
04/20/2010 KERN CA BROADCAST MEDIA

TREE FELL DOWN ON CAR DRIVING ON GOSFORD RD JUST SOUTH OF
STOCKDALE HWY

1046 AM NON-TSTM WND GST 6 NNE BAKERSFIELD 35.44N 118.96W
04/20/2010 M41.00 MPH KERN CA ASOS

AT MEADOWS FIELD AIRPORT

0245 PM HAIL AVENAL 36.03N 120.11W
04/20/2010 E0.25 INCH KINGS CA OFFICIAL NWS OBS

AT TAMARACK ELEMENTARY SCHOOL WEATHER STATION

&&

$$

BSO

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KFFC [202227]: Preliminary Local Storm Report

NWUS52 KFFC 202227
LSRFFC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
627 PM EDT TUE APR 20 2010

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

0606 PM HAIL 3 SE CORDELE 31.93N 83.73W
04/20/2010 E0.75 INCH CRISP GA COUNTY OFFICIAL

&&

$$

JLF

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KPUB [202225]: Preliminary Local Storm Report

NWUS55 KPUB 202225
LSRPUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
425 PM MDT TUE APR 20 2010

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

0422 PM HAIL 1 WSW COLORADO CITY 37.94N 104.86W
04/20/2010 M0.88 INCH PUEBLO CO TRAINED SPOTTER

&&

$$

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KPUB [202225]: Preliminary Local Storm Report

NWUS55 KPUB 202225
LSRPUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
425 PM MDT TUE APR 20 2010

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

0418 PM HAIL 1 WNW COLORADO CITY 37.95N 104.87W
04/20/2010 M0.88 INCH PUEBLO CO TRAINED SPOTTER

&&

$$

JKH

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KLKN [202225]: Preliminary Local Storm Report

NWUS55 KLKN 202225
LSRLKN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ELKO NV
324 PM PDT TUE APR 20 2010

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

0145 PM TSTM WND GST 10 SW WINNEMUCCA 40.87N 117.86W
04/20/2010 M74.00 MPH HUMBOLDT NV MESONET

ROSE CREEK NDOT MESONET SITE.

0202 PM TSTM WND GST WINNEMUCCA 40.97N 117.73W
04/20/2010 M61.00 MPH HUMBOLDT NV ASOS

WINNEMUCCA AIRPORT.

0230 PM TSTM WND GST 10 NW PARADISE VALLEY 41.60N 117.67W
04/20/2010 M67.00 MPH HUMBOLDT NV MESONET

MOREY CREEK RAWS SITE.

&&

$$

CEC

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KVEF [202206]: Preliminary Local Storm Report

NWUS55 KVEF 202206
LSRVEF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
306 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

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

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

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.

&&
PEAK WIND GUSTS SO FAR TODAY ACROSS THE AREA.
$$

STACHELSKI

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KFFC [202158]: Preliminary Local Storm Report

NWUS52 KFFC 202158
LSRFFC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
558 PM EDT TUE APR 20 2010

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

0535 PM HAIL FAIRBURN 33.57N 84.58W
04/20/2010 E0.25 INCH FULTON GA PUBLIC

&&

$$

20

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KHNX [202140]: Preliminary Local Storm Report

NWUS56 KHNX 202140
LSRHNX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY CA
240 PM PDT TUE APR 20 2010

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

0948 AM NON-TSTM WND DMG 8 SE FRESNO 36.70N 119.69W
04/20/2010 FRESNO CA LAW ENFORCEMENT

TREE BRANCH BLOCKING SOUTHBOUND LANES ON GOLDEN STATE
BLVD AT CLOVIS AVE

1017 AM NON-TSTM WND DMG 4 N VISALIA 36.38N 119.32W
04/20/2010 TULARE CA LAW ENFORCEMENT

CHP REPORTED TWO TELEPHONE POLES LEANING OVER ALMOST INTO
ROADWAY ALONG SR 63 JUST NORTH OF AVE 328

1204 PM NON-TSTM WND GST 1 SSE INYOKERN 35.63N 117.81W
04/20/2010 M54.00 MPH KERN CA MESONET

1238 PM NON-TSTM WND DMG 16 SW SHAVER LAKE 36.94N 119.52W
04/20/2010 FRESNO CA LAW ENFORCEMENT

CHP REPORTED SMALL LANDSLIDE BLOCKING WESTBOUND LANE ON
OLD TOLLHOUSE RD AT PITTMAN HILL RD OR ABOUT 6 MI SW OF
PRATHER

1241 PM NON-TSTM WND GST 2 NW RIDGECREST 35.65N 117.69W
04/20/2010 M47.00 MPH KERN CA MESONET

1255 PM NON-TSTM WND GST 1 NW INYOKERN 35.66N 117.82W
04/20/2010 M56.00 MPH KERN CA AWOS

1256 PM NON-TSTM WND GST 3 NE RIDGECREST 35.66N 117.62W
04/20/2010 M53.00 MPH KERN CA ASOS

CHINA LAKE ASOS

0113 PM NON-TSTM WND GST INDIAN WELLS CANYON 35.69N 117.89W
04/20/2010 M57.00 MPH KERN CA MESONET

INDIAN WELLS CANYON RAWS

0113 PM NON-TSTM WND GST LAUREL MOUNTAIN 35.48N 117.70W
04/20/2010 M49.00 MPH KERN CA MESONET

LAUREL MOUNTAIN RAWS

0122 PM NON-TSTM WND GST 4 SW RIDGECREST 35.59N 117.71W
04/20/2010 M55.00 MPH KERN CA MESONET

&&

$$

BSO

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KREV [202139]: Preliminary Local Storm Report

NWUS55 KREV 202139
LSRREV

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RENO NV
239 PM PDT TUE APR 20 2010

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

0238 PM DUST STORM NW IMLAY 40.66N 118.15W
04/20/2010 PERSHING NV TRAINED SPOTTER

A TRAINED WEATHER SPOTTER REPORTED THAT STRONG WINDS
PICKED UP DUST FROM APPROXIMATELY 12 PM TO 1 PM. HOWEVER,
VISIBILITY WAS NOT SIGNIFICANTLY REDUCED. AS THE COLD
FRONT MOVED THROUGH THE RAIN ASSOCIATED WITH IT CAUSED
THE DUST TO SETTLE.

&&

$$

O'HARA

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KFFC [202139]: Preliminary Local Storm Report

NWUS52 KFFC 202139
LSRFFC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
539 PM EDT TUE APR 20 2010

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

0345 PM TSTM WND DMG 2 ENE MONTEZUMA 32.31N 84.00W
04/20/2010 MACON GA LAW ENFORCEMENT

FOUR TREES DOWN ALONG HWY. 224

&&

$$

JLF

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KPUB [202132]: Preliminary Local Storm Report

NWUS55 KPUB 202132
LSRPUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
332 PM MDT TUE APR 20 2010

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

0331 PM HAIL 3 SW PUEBLO 38.24N 104.65W
04/20/2010 E0.75 INCH PUEBLO CO PUBLIC

&&

$$

EPETERSE

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KPUB [202101]: Preliminary Local Storm Report

NWUS55 KPUB 202101
LSRPUB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
301 PM MDT TUE APR 20 2010

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

0255 PM HAIL 3 NNE PUEBLO 38.30N 104.59W
04/20/2010 E0.75 INCH PUEBLO CO TRAINED SPOTTER

0255 PM HAIL 3 NNE PUEBLO 38.31N 104.59W
04/20/2010 E0.50 INCH PUEBLO CO AMATEUR RADIO

&&

$$

JKH

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MESO: Mesoscale Discussion 0326

ACUS11 KWNS 202007
SWOMCD
SPC MCD 202006
NVZ000-IDZ000-ORZ000-202130-

MESOSCALE DISCUSSION 0326
NWS STORM PREDICTION CENTER NORMAN OK
0306 PM CDT TUE APR 20 2010

AREAS AFFECTED...CENTRAL/NORTHERN NV INTO SOUTHEAST ORE/SOUTHWEST ID

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 202006Z - 202130Z

STRONG/NEAR SEVERE WIND GUSTS AND SMALL HAIL WILL BE POSSIBLE ACROSS
NORTHERN/CENTRAL NV AND SURROUNDING PORTIONS OF SOUTHEAST
ORE/SOUTHWEST ID THIS AFTERNOON. A SEVERE TSTM WATCH IS NOT
EXPECTED.

AMPLE LARGE SCALE FORCING FOR ASCENT AHEAD OF THE WEST COAST UPPER
TROUGH...UPPER JET EXIT REGION...AND A STRONG/STEADILY EASTWARD
PROGRESSING COLD FRONT WILL FOCUS BANDS OF STRONG TSTMS ACROSS
CENTRAL/NORTHERN NV INTO ADJACENT SOUTHEAST ORE/SOUTHWEST ID THIS
AFTERNOON. MUCH OF THIS ACTIVITY WILL BE DECIDEDLY FOCUSED
IMMEDIATELY ALONG THE ADVANCING COLD FRONT...BUT A WARM/WEAKLY
CAPPED BOUNDARY LAYER MAY YIELD SOME ISOLATED FRONT-LEADING TSTM
DEVELOPMENT AS WELL. WITH SLIGHTLY ABOVE NORMAL PRECIPITABLE WATER
VALUES /0.30-0.40 IN PER 12Z OBSERVED LKN AND REV RAOBS/ AND A WARM
BOUNDARY LAYER /MID 60S TO LOWER 70S F/...VERY STRONG/NEARLY
UNIDIRECTIONAL WIND PROFILES /50 KT WITHIN LOWEST 3-4 KM PER LRX
WSR-88D VWP/ WILL SUPPORT CONVECTIVE WIND GUSTS TO AROUND SEVERE
LEVELS AS STORMS RACE N-NE...IN ADDITION TO THE POSSIBILITY OF SOME
HAIL. ALONG THESE LINES...A 51 KT GUST WAS RECENTLY MEASURED AT
LOVELOCK NV /1930Z/.

..GUYER.. 04/20/2010

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

ATTN...WFO...BOI...LKN...REV...

LAT...LON 41341854 42671807 42651603 40461569 38621687 38521778
39561835 41341854

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KREV [201954]: Preliminary Local Storm Report

NWUS55 KREV 201954
LSRREV

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RENO NV
1252 PM PDT TUE APR 20 2010

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

1252 PM NON-TSTM WND GST CARSON CITY 39.17N 119.76W
04/20/2010 M52.00 MPH CARSON CITY NV DEPT OF HIGHWAYS

A NEVADA DOT WIND SENSOR LOCATED ON HIGHWAY 50
ONE-QUARTER MILE WEST OF HIGHWAY 395 IN SOUTHWEST CARSON
CITY RECORDED A WIND GUST OF 52 MPH AT 1005 AM PDT.

&&

$$

O'HARA

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KREV [201947]: Preliminary Local Storm Report

NWUS55 KREV 201947
LSRREV

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RENO NV
1247 PM PDT TUE APR 20 2010

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

1214 PM NON-TSTM WND GST SCHURZ 38.99N 118.83W
04/20/2010 M58.00 MPH MINERAL NV MESONET

58 MPH GUST AT 1214PM IN SCHURZ NEVADA ALONG COLD FRONT.

&&

$$

HOON

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MESO: Mesoscale Discussion 0325

ACUS11 KWNS 201940
SWOMCD
SPC MCD 201940
OKZ000-COZ000-TXZ000-NMZ000-202045-

MESOSCALE DISCUSSION 0325
NWS STORM PREDICTION CENTER NORMAN OK
0240 PM CDT TUE APR 20 2010

AREAS AFFECTED...HIGH PLAINS OF SE CO...NE NM AND FAR WRN TX/OK
PANHANDLES

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 201940Z - 202045Z

A THREAT FOR MARGINALLY SEVERE WIND AND HAIL THREAT IS EXPECTED TO
DEVELOP OVER THE HIGH PLAINS OF SE CO...NE NM AND THE FAR WRN OK/TX
PANHANDLES THIS AFTERNOON. A WW IS NOT CURRENTLY ANTICIPATED.

EASTERLY UPSLOPE FLOW HAS DEVELOPED IN RESPONSE TO LEE SFC TROUGH
AND WEAK CYCLOGENESIS NEAR PUB. RECENT VIS SATELLITE IMAGERY
INDICATES CONVECTION IS UNDERWAY OVER THE FRONT RANGE...AND MORE
RECENTLY INTO SE CO AND NE NM. ADDITIONAL CONVECTIVE DEVELOPMENT IS
EXPECTED TO BE FOCUSED ALONG THE HIGH PLAINS DURING THE NEXT SEVERAL
HOURS...WHERE A MORE MOIST/UNSTABLE ENVIRONMENT EXISTS. LATEST SFC
ANALYSIS SHOWS WIDESPREAD DEWPOINTS IN THE UPPER 40S TO LOWER 50S
ACROSS MUCH OF THE CNTRL/SRN HIGH PLAINS...WHICH SHOULD BE
SUFFICIENT TO YIELD ML CAPE VALUES AROUND 500-1000 J/KG. VEERING
WIND PROFILE WILL YIELD 25-35 KT OF SFC-6 KM SHEAR PER AREA
VWP/PROFILER DATA...DESPITE WEAK MID-LEVEL FLOW. MARGINAL SUPERCELL
STRUCTURE MAY OCCASIONALLY BE OBSERVED WITH THE STRONGER CELLS AS
INSTABILITY INCREASES THIS AFTERNOON.

..ROGERS.. 04/20/2010

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

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

LAT...LON 36120386 36850399 37390408 37960404 38250376 38190301
37830278 36980266 36220259 35600281 35580368 36120386

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KREV [201940]: Preliminary Local Storm Report

NWUS55 KREV 201940
LSRREV

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RENO NV
1240 PM PDT TUE APR 20 2010

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

1231 PM NON-TSTM WND GST LOVELOCK 40.18N 118.48W
04/20/2010 M59.00 MPH PERSHING NV ASOS

59 MPH GUST AT LOVELOCK DERBY FIELD. BLOWING DUST DOWN TO
NEAR ONE MILE VISIBILITY. THUNDERSTORMS ALONG THE FRONT.

&&

$$

HOON

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 201931
SWODY1
SPC AC 201930

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0230 PM CDT TUE APR 20 2010

VALID 202000Z - 211200Z

...NO SVR TSTM AREAS FORECAST...

...GREAT BASIN...

EXIT REGION OF UPPER JET...AND ASSOCIATED ZONE OF FOCUSED
ASCENT...IS SPREADING ACROSS NRN CA/NWRN NV IN LINE WITH EARLIER
FORECASTS. ALONG THE LEADING EDGE OF THIS FORCING...STRONG UPDRAFTS
WITH LIGHTNING HAVE DEVELOPED FROM WASHOE COUNTY NV...SWD TO
CHURCHILL COUNTY NV. WITH SFC-3KM LAPSE RATES ROUGHLY DRY
ADIABATIC...HEAVIER RAIN SHOWERS BENEATH HIGH BASED THUNDERSTORMS
COULD PRODUCE MARGINALLY SEVERE WIND GUSTS WITHIN STRONGLY SHEARED
ENVIRONMENT. LARGE SCALE FORCING SEEMS SUPPORTIVE OF A LOOSELY
ORGANIZED SQUALL LINE SPREADING/DEVELOPING ENEWD INTO PARTS OF
ID/NERN NV INTO THE EARLY EVENING HOURS.

...HIGH PLAINS...

CONVECTION IS GRADUALLY DEEPENING ACROSS THE HIGHER TERRAIN OF
CO/NM...WITH GLACIATION AND LIGHTNING NOW OCCURRING WITH STRONGEST
UPDRAFTS. LATEST SATELLITE IMAGERY DEPICTS A RELATIVELY CLOUD-FREE
ZONE...ROUGHLY 100 MI WIDE...JUST DOWNSTREAM OF THE EAST SLOPES
WHICH CONTINUES TO WARM AND DESTABILIZE. LATEST OBSERVATIONAL DATA
SUGGESTS A NARROW AXIS OF SBCAPE VALUES ON THE ORDER OF 500-1000
J/KG WILL PROVE SUPPORTIVE OF GROWTH/MAINTENANCE OF MARGINALLY
SHEARED UPDRAFTS...PRIMARILY ACROSS THE HIGH PLAINS WEST OF THE
THICK STRATUS DECK. SOME HAIL AND GUSTY WINDS REMAIN POSSIBLE.

..DARROW.. 04/20/2010

.PREV DISCUSSION... /ISSUED 1127 AM CDT TUE APR 20 2010/

...SYNOPSIS...
A STRONG MIDLEVEL TROUGH WILL MOVE SEWD OVER CENTRAL/SRN CA THROUGH
THE PERIOD...WHILE A SPLIT FLOW REGIME PERSISTS DOWNSTREAM OVER MUCH
OF THE CONUS. THE RICHER MOISTURE AND ASSOCIATED INSTABILITY IS
LOCATED WELL TO THE S ACROSS THE GULF OF MEXICO IN ASSOCIATION WITH
A MEAN BAROCLINIC ZONE AND THE SUBTROPICAL JET. ONE EMBEDDED SPEED
MAX NOW OVER THE NW GULF WILL MOVE EWD TO FL BY TONIGHT...BUT MODEST
LOW-LEVEL MOISTURE AND POOR MIDLEVEL LAPSE RATES WILL LIMIT THE
THREAT FOR STRONG/SEVERE STORMS ACROSS FL THROUGH THE PERIOD.

...CENTRAL HIGH PLAINS THIS AFTERNOON/EVENING...
THE PRIMARY THREAT AREA FOR STRONG/SEVERE STORMS THIS AFTERNOON INTO
EARLY TONIGHT WILL BE ACROSS THE CENTRAL HIGH PLAINS IN ASSOCIATION
WITH A WEAK SURFACE LEE TROUGH/CYCLONE. EMBEDDED SPEED MAXIMA
/WITHIN AN INTERMEDIATE FLOW STREAM/ WILL PROGRESS SEWD FROM ERN WY
TO KS...AND ANOTHER WEAKER SPEED MAX WILL EJECT EWD ACROSS CO IN
ADVANCE OF THE CA TROUGH. AT THE SURFACE...A WEAK LEE CYCLONE
ACROSS SE CO WILL DRIFT SWD BY TONIGHT AS A REINFORCING COLD FRONTAL
SURGE PROGRESSES SWD ACROSS THE HIGH PLAINS IN ASSOCIATION WITH THE
MIDLEVEL SPEED MAX. THE COMBINATION OF THE SURFACE BOUNDARIES AND
MIDLEVEL TROUGH WILL HELP FOCUS THUNDERSTORM DEVELOPMENT ACROSS ERN
CO/SW NEB/WRN KS THIS AFTERNOON...AND CONVECTION WILL MOVE SEWD
ACROSS KS TO NW OK TONIGHT.

VISIBLE IMAGERY SHOWS SOME THINNING OF THE STRATUS CLOUDS ACROSS SE
CO...WHILE THE 12Z SOUNDINGS SUGGEST THAT CLOUDS WILL PERSIST AT
LEAST INTO EARLY AFTERNOON FARTHER E INTO SW KS TO THE ERN TX
PANHANDLE. THUS...THE STRONGER SURFACE HEATING WILL OCCUR NEAR THE
LEE TROUGH/CYCLONE ACROSS SE CO THIS AFTERNOON...WHERE MLCAPE WILL
APPROACH 1000 J/KG WITH TEMPERATURES IN THE LOW 70S AND BOUNDARY
LAYER DEWPOINTS IN THE MID-UPPER 40S. ADDITIONALLY...MIDLEVEL FLOW
WILL GRADUALLY INCREASE TO NEAR 30 KT ABOVE LOW-LEVEL SLY/SELY
FLOW...RESULTING IN EFFECTIVE BULK SHEAR OF 30-40 KT. THE
COMBINATION OF VERTICAL SHEAR AND INSTABILITY WILL BE AT LEAST
MARGINALLY SUFFICIENT FOR SUPERCELLS...WITH HAIL NEAR 1 INCH IN
DIAMETER POSSIBLE...ALONG WITH STRONG OUTFLOW WINDS. OVERALL...THE
SEVERE STORM THREAT STILL APPEARS TO BE A LITTLE TOO MARGINAL TO
JUSTIFY A CATEGORICAL UPGRADE.

...NRN GREAT BASIN THIS AFTERNOON/EVENING...
THOUGH LOW-LEVEL MOISTURE WILL BE SOMEWHAT LIMITED ACROSS THE GREAT
BASIN THIS AFTERNOON/EVENING...CONDITIONALLY UNSTABLE LAPSE RATES
AND FOCUSED ASCENT NE OF THE CA MIDLEVEL LOW WILL RESULT IN THE
DEVELOPMENT OF WEAK INSTABILITY FROM NRN NV INTO SW ID. A FEW
THUNDERSTORMS WILL FORM ALONG THE DEEP BAROCLINIC ZONE AND BELT OF
ASCENT BY MID-LATE AFTERNOON...WHEN INSTABILITY AND DEEP-LAYER SLY
VERTICAL SHEAR COULD SUPPORT STORMS WITH SMALL HAIL AND STRONG
OUTFLOW WINDS.

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KREV [201851]: Preliminary Local Storm Report

NWUS55 KREV 201851
LSRREV

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RENO NV
1150 AM PDT TUE APR 20 2010

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

1148 AM NON-TSTM WND GST YERINGTON 38.99N 119.16W
04/20/2010 M57.00 MPH LYON NV AWOS

57 MPH GUST AT 1135 AM IN YERINGTON NEVADA. ASSOCIATED
WITH COLD FRONT, NO THUNDERSTORMS IN AREA.

&&

$$

HOON

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DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 201714
SWODY2
SPC AC 201713

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1213 PM CDT TUE APR 20 2010

VALID 211200Z - 221200Z

...NO SVR TSTM AREAS FORECAST...

FAIRLY IMPRESSIVE UPPER TROUGH WILL MOVE ONSHORE ALONG THE CA COAST
BEFORE MOVING INTO THE GREAT BASIN LATE WEDNESDAY. DOWNSTREAM OF
THIS FEATURE...UPPER RIDGING WILL GRADUALLY SHIFT EAST INTO THE
CNTRL/SRN PLAINS AS HEIGHT FALLS SPREAD ACROSS THE SRN ROCKIES. AT
THE SURFACE...WEAK CYCLOGENESIS IN THE LEE OF THE SRN ROCKIES SHOULD
DAMPEN OUT OVER THE TX PANHANDLE EARLY IN THE PERIOD AS LARGE SCALE
FORCING BEGINS TO FOCUS ACROSS THE SRN ROCKIES IN ADVANCE OF UPPER
TROUGH. RESULTANT LEE TROUGH/DRY LINE SHOULD RETREAT INTO EXTREME
ERN NM BY PEAK HEATING WITH AN E-W SURFACE TROUGH OR WARM FRONT-LIKE
BOUNDARY EXPECTED TO EXTEND ALONG THE RED RIVER. THE RED RIVER
BOUNDARY WILL LIKELY SERVE AS THE DEMARCATION FOR EARLY-MID DAY
CONVECTION DRIVEN IN LARGE PART BY WARM ADVECTION. THIS
ACTIVITY...POSSIBLY AN MCS-LIKE CLUSTER...SHOULD SPREAD ACROSS OK
BEFORE WEAKENING OVER AR AS VEERED LLJ DECREASES AND BEGINS TO
RESPOND TO WRN U.S. TROUGH OVER THE SRN HIGH PLAINS. STRONG HEATING
WILL LIKELY BE FOCUSED OVER THE PLAINS OF ERN NM/WEST TX SOUTH OF
THE WARM FRONT AND FORECAST SOUNDINGS SUGGEST SFC-BASED PARCELS
COULD REACH THEIR CONVECTIVE TEMPERATURES ACROSS UPSLOPE REGIONS OF
THE HIGH PLAINS BY LATE AFTERNOON. EVEN SO...DEEP LAYER SHEAR IS
NOT EXPECTED TO BE PARTICULARLY STRONG...BUT VEERING PROFILES WITH
HEIGHT DO FAVOR ROTATING UPDRAFTS...ESPECIALLY WHERE LOW LEVEL FLOW
IS DECIDEDLY ELY ALONG/NORTH OF WARM FRONT. AT THIS TIME WILL
MAINTAIN 5% PROBABILITIES FOR PRIMARILY LARGE HAIL WITH ANY SLOW
MOVING SUPERCELLS. A SLIGHT RISK MAY NEED TO BE ADDED TO PORTIONS
OF THE SRN HIGH PLAINS IN LATER OUTLOOKS IF IT APPEARS DIURNAL
HEATING WILL CONTRIBUTE TO SUBSTANTIAL CONVECTIVE
DEVELOPMENT...PRIMARILY ACROSS THE TX SOUTH PLAINS.

..DARROW.. 04/20/2010

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 201628
SWODY1
SPC AC 201627

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1127 AM CDT TUE APR 20 2010

VALID 201630Z - 211200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
A STRONG MIDLEVEL TROUGH WILL MOVE SEWD OVER CENTRAL/SRN CA THROUGH
THE PERIOD...WHILE A SPLIT FLOW REGIME PERSISTS DOWNSTREAM OVER MUCH
OF THE CONUS. THE RICHER MOISTURE AND ASSOCIATED INSTABILITY IS
LOCATED WELL TO THE S ACROSS THE GULF OF MEXICO IN ASSOCIATION WITH
A MEAN BAROCLINIC ZONE AND THE SUBTROPICAL JET. ONE EMBEDDED SPEED
MAX NOW OVER THE NW GULF WILL MOVE EWD TO FL BY TONIGHT...BUT MODEST
LOW-LEVEL MOISTURE AND POOR MIDLEVEL LAPSE RATES WILL LIMIT THE
THREAT FOR STRONG/SEVERE STORMS ACROSS FL THROUGH THE PERIOD.

...CENTRAL HIGH PLAINS THIS AFTERNOON/EVENING...
THE PRIMARY THREAT AREA FOR STRONG/SEVERE STORMS THIS AFTERNOON INTO
EARLY TONIGHT WILL BE ACROSS THE CENTRAL HIGH PLAINS IN ASSOCIATION
WITH A WEAK SURFACE LEE TROUGH/CYCLONE. EMBEDDED SPEED MAXIMA
/WITHIN AN INTERMEDIATE FLOW STREAM/ WILL PROGRESS SEWD FROM ERN WY
TO KS...AND ANOTHER WEAKER SPEED MAX WILL EJECT EWD ACROSS CO IN
ADVANCE OF THE CA TROUGH. AT THE SURFACE...A WEAK LEE CYCLONE
ACROSS SE CO WILL DRIFT SWD BY TONIGHT AS A REINFORCING COLD FRONTAL
SURGE PROGRESSES SWD ACROSS THE HIGH PLAINS IN ASSOCIATION WITH THE
MIDLEVEL SPEED MAX. THE COMBINATION OF THE SURFACE BOUNDARIES AND
MIDLEVEL TROUGH WILL HELP FOCUS THUNDERSTORM DEVELOPMENT ACROSS ERN
CO/SW NEB/WRN KS THIS AFTERNOON...AND CONVECTION WILL MOVE SEWD
ACROSS KS TO NW OK TONIGHT.

VISIBLE IMAGERY SHOWS SOME THINNING OF THE STRATUS CLOUDS ACROSS SE
CO...WHILE THE 12Z SOUNDINGS SUGGEST THAT CLOUDS WILL PERSIST AT
LEAST INTO EARLY AFTERNOON FARTHER E INTO SW KS TO THE ERN TX
PANHANDLE. THUS...THE STRONGER SURFACE HEATING WILL OCCUR NEAR THE
LEE TROUGH/CYCLONE ACROSS SE CO THIS AFTERNOON...WHERE MLCAPE WILL
APPROACH 1000 J/KG WITH TEMPERATURES IN THE LOW 70S AND BOUNDARY
LAYER DEWPOINTS IN THE MID-UPPER 40S. ADDITIONALLY...MIDLEVEL FLOW
WILL GRADUALLY INCREASE TO NEAR 30 KT ABOVE LOW-LEVEL SLY/SELY
FLOW...RESULTING IN EFFECTIVE BULK SHEAR OF 30-40 KT. THE
COMBINATION OF VERTICAL SHEAR AND INSTABILITY WILL BE AT LEAST
MARGINALLY SUFFICIENT FOR SUPERCELLS...WITH HAIL NEAR 1 INCH IN
DIAMETER POSSIBLE...ALONG WITH STRONG OUTFLOW WINDS. OVERALL...THE
SEVERE STORM THREAT STILL APPEARS TO BE A LITTLE TOO MARGINAL TO
JUSTIFY A CATEGORICAL UPGRADE.

...NRN GREAT BASIN THIS AFTERNOON/EVENING...
THOUGH LOW-LEVEL MOISTURE WILL BE SOMEWHAT LIMITED ACROSS THE GREAT
BASIN THIS AFTERNOON/EVENING...CONDITIONALLY UNSTABLE LAPSE RATES
AND FOCUSED ASCENT NE OF THE CA MIDLEVEL LOW WILL RESULT IN THE
DEVELOPMENT OF WEAK INSTABILITY FROM NRN NV INTO SW ID. A FEW
THUNDERSTORMS WILL FORM ALONG THE DEEP BAROCLINIC ZONE AND BELT OF
ASCENT BY MID-LATE AFTERNOON...WHEN INSTABILITY AND DEEP-LAYER SLY
VERTICAL SHEAR COULD SUPPORT STORMS WITH SMALL HAIL AND STRONG
OUTFLOW WINDS.

..THOMPSON/ROGERS.. 04/20/2010

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DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 201454
SWOD48
SPC AC 201453

DAY 4-8 CONVECTIVE OUTLOOK CORR 1
NWS STORM PREDICTION CENTER NORMAN OK
0953 AM CDT TUE APR 20 2010

VALID 231200Z - 281200Z

CORRECTED FOR DATE ERROR

...DISCUSSION...
A LARGE UPPER STORM SYSTEM WILL CONTINUE MOVING SLOWLY EWD
INTO/ACROSS THE CENTRAL U.S. DURING THE FIRST TWO DAYS OF THE
PERIOD...AFTER WHICH THE SYSTEM IS EXPECTED TO BEGIN
WEAKENING/SHIFTING MORE NEWD TOWARD THE MIDWEST. MODELS BEGIN TO
DIVERGE FAIRLY SUBSTANTIALLY DAY 6 AND BEYOND...BUT AGREEMENT IS
SUFFICIENT DAYS 4-5 /FRI. AND SAT. APR. 23-24/ TO BOOST CONFIDENCE
WITH RESPECT TO THE EVOLUTION OF SEVERE POTENTIAL.

IT APPEARS ATTM THAT A WIDESPREAD AREA OF FAIRLY SUBSTANTIAL SEVERE
THREAT WILL EXIST DAY 4 /FRI THE 23RD/...WITH THE GREATEST THREAT
APPARENT ATTM FROM SERN KS/SWRN MO SSWWD INTO SERN TX. HERE...A
MOIST/UNSTABLE PRE-FRONTAL AIRMASS IS EXPECTED...AND WITH FAVORABLE
SHEAR -- INCLUDING MID-LEVEL FLOW IN EXCESS OF 50 KT -- ATOP THE
FRONTAL ZONE...THE OVERALL ENVIRONMENT APPEARS FAVORABLE FOR AN
ACTIVE SEVERE WEATHER EVENT.

ENHANCED SEVERE POTENTIAL SHOULD SPREAD EWD INTO THE MS VALLEY
REGION DAY 5 /SAT. THE 24TH/...WITH A SIMILARLY FAVORABLE KINEMATIC
AND THERMODYNAMIC ENVIRONMENT LIKELY NEAR/AHEAD OF THE ADVANCING
FRONT. BOTH DAYS...LARGE HAIL AND DAMAGING WINDS WILL BE
POSSIBLE...WHILE THE MOIST BOUNDARY LAYER AND FAVORABLY-STRONG SHEAR
ARE ALSO INDICATIVE OF TORNADO POTENTIAL.

COMBINATION OF THE DECREASING MODEL AGREEMENT AND VEERING LOW-LEVEL
FLOW DAY 6 ACROSS THE SOUTHEAST AS THE UPPER SYSTEM TURNS MORE NELY
PRECLUDES THE ISSUANCE OF A THREAT AREA. NONETHELESS...SOME SEVERE
POTENTIAL WILL LIKELY EXIST -- PARTICULARLY E OF THE MS AND S OF THE
OH VALLEYS.

..GOSS.. 04/20/2010

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MESO: Mesoscale Discussion 0324

ACUS11 KWNS 201257
SWOMCD
SPC MCD 201256
CAZ000-201600-

MESOSCALE DISCUSSION 0324
NWS STORM PREDICTION CENTER NORMAN OK
0756 AM CDT TUE APR 20 2010

AREAS AFFECTED...PARTS OF THE NRN/CNTRL SIERRA

CONCERNING...HEAVY SNOW

VALID 201256Z - 201600Z

INCREASING SNOW RATES AND LOWERING SNOW LEVELS ALONG THE SIERRA
NEVADA WEST OF LAKE TAHOE THROUGH THE YOSEMITE AREA ARE EXPECTED
THROUGH MIDDAY.

AS A LARGE COLD UPPER TROUGH CONTINUES TO DIG INTO CALIFORNIA THIS
MORNING...LARGE-SCALE MID/UPPER FORCING FOR UPWARD VERTICAL MOTION
AND OROGRAPHIC LIFT ARE CONTRIBUTING TO INCREASING PRECIPITATION
RATES ACROSS THE NORTHERN AND CENTRAL SIERRA NEVADA. MID/LOWER
TROPOSPHERIC COLD ADVECTION APPEARS LIKELY TO LOWER SNOW LEVELS TO
AROUND OR BELOW 4000 FEET AGL BY THE 16-19Z TIME FRAME...WHEN SNOW
RATES MAY BECOME MAXIMIZED WITHIN FRONTAL BAND NEAR OR NORTHWEST OF
YOSEMITE NATIONAL PARK. FAIRLY HIGH PRECIPITABLE WATER CONTENT
AROUND .9 INCH ADVECTING INTO THIS REGION COULD SUPPORT RATES ON THE
ORDER OF 2 INCHES PER HOUR.

..KERR.. 04/20/2010

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

ATTN...WFO...REV...HNX...STO...

LAT...LON 38872019 38651989 37901918 37491904 37131971 38012046
39022055 38872019

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 201210
SWODY1
SPC AC 201208

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0708 AM CDT TUE APR 20 2010

VALID 201300Z - 211200Z

...NO SVR TSTM AREAS FORECAST...

...CENTRAL HIGH PLAINS...
OVERALL SETUP WILL CONTINUE TO GET MORE FAVORABLE FOR STRONG/SEVERE
THUNDERSTORMS OVER THE SRN/CENTRAL HIGH PLAINS DURING THE PERIOD...
AS BOUNDARY LAYER MOISTURE SLOWLY INCREASES OVER THE SRN PLAINS.
FLOW WILL REMAIN PREDOMINATELY NW ALOFT WITH SLOW MOVING IMPULSE
DIGGING SEWD OUT OF THE NRN HIGH PLAINS. THIS SYSTEM SHOULD AID
TSTM DEVELOPMENT THIS AFTERNOON OVER THE CENTRAL HIGH PLAINS AS WEAK
VERTICAL MOTION OVERSPREADS UPSLOPE FLOW REGIME. ALTHOUGH
INSTABILITY WILL REMAIN MODEST AT BEST / SBCAPE TO 1000-1300 J/KG
/... DEEP LAYER SHEAR SHOULD SUSTAIN MORE ORGANIZED UPDRAFTS WITH
STRONG DIRECTIONAL COMPONENT IN THE LOW TO MID LEVELS. STRONGEST
STORMS SHOULD SUPPORT A RISK OF HAIL NEAR OR BRIEFLY EXCEEDING
SEVERE LEVELS THROUGH THE EARLY EVENING. ADDITIONALLY...A FEW
STRONG GUSTS CAN BE EXPECTED. ACTIVITY SHOULD GRADUALLY EVOLVE INTO
A SMALL MCS AND PERSIST OVERNIGHT SEWD INTO PARTS OF KS/OK ALONG
NOSE OF 35+ KT SSWLY LLJ. OVERALL SEVERE THREAT IS EXPECTED TO
REMAIN HINDERED BY REMNANT COOL/DRY BOUNDARY LAYER IN
PLACE...ALTHOUGH AN UPGRADE TO A SLGT RISK IS NOT OUT OF THE
QUESTION THIS AFTERNOON SHOULD GREATER INSTABILITY BECOME EVIDENT.

...WRN GREAT BASIN/NRN INTERMOUNTAIN REGION...
STRONG MID/UPPER LOW OFF THE NRN CA COAST EARLY THIS MORNING WILL
CONTINUE DIGGING SEWD ACROSS CA/WRN NV THROUGH THE PERIOD...AS VERY
STRONG MID/UPPER LEVEL JET DEVELOPS FROM THE SRN CA/MEXICO BORDER
INTO THE GREAT BASIN. THIS WILL ALLOW LAPSE RATES TO STEEPEN AND
ENHANCE VERTICAL MOTION ACROSS WRN PORTIONS OF THE INTERMOUNTAIN
WEST THIS AFTERNOON. ALTHOUGH PRECEDING AIR MASS WILL REMAIN
RELATIVELY DRY...WEAK INSTABILITY CAN BE EXPECTED THIS AFTERNOON
WITH MODEST SURFACE HEATING AHEAD OF ASSOCIATED SURFACE COLD
FRONT.THE STRONG DYNAMIC FORCING FOR ASCENT COUPLED WITH MESOSCALE
LIFT ALONG THE COLD FRONT MAY FOSTER SCATTERED...LOW-TOPPED TSTMS
THIS AFTERNOON INTO EVENING WHICH WILL MOVE RAPIDLY NNEWD WITHIN
STRENGTHENING DEEP-LAYER WIND FIELD. HAIL AND STRONG WIND GUSTS MAY
ACCOMPANY THESE STORMS THROUGH THE EVENING GIVEN THE STEEP LAPSE
RATES AND COOL THERMODYNAMIC PROFILES.

..EVANS/STOPPKOTTE.. 04/20/2010

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KLBF [201204]: Preliminary Local Storm Report

NWUS53 KLBF 201204
LSRLBF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
703 AM CDT TUE APR 20 2010

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

0800 PM HEAVY RAIN 20 S VALENTINE 42.58N 100.55W
04/19/2010 E0.66 INCH CHERRY NE PUBLIC

THUNDERSTORM PRODUCED 2/3RDS OF AN INCH OF RAIN IN LESS
THAN AN HOUR.

&&

$$

MBYRD

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DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 200846
SWOD48
SPC AC 200846

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0346 AM CDT TUE APR 20 2010

VALID 231200Z - 281200Z

...DISCUSSION...
A LARGE UPPER STORM SYSTEM WILL CONTINUE MOVING SLOWLY EWD
INTO/ACROSS THE CENTRAL U.S. DURING THE FIRST TWO DAYS OF THE
PERIOD...AFTER WHICH THE SYSTEM IS EXPECTED TO BEGIN
WEAKENING/SHIFTING MORE NEWD TOWARD THE MIDWEST. MODELS BEGIN TO
DIVERGE FAIRLY SUBSTANTIALLY DAY 6 AND BEYOND...BUT AGREEMENT IS
SUFFICIENT DAYS 4-5 /FRI. AND SAT. APR. 24-25/ TO BOOST CONFIDENCE
WITH RESPECT TO THE EVOLUTION OF SEVERE POTENTIAL.

IT APPEARS ATTM THAT A WIDESPREAD AREA OF FAIRLY SUBSTANTIAL SEVERE
THREAT WILL EXIST DAY 4 /FRI THE 24TH/...WITH THE GREATEST THREAT
APPARENT ATTM FROM SERN KS/SWRN MO SSWWD INTO SERN TX. HERE...A
MOIST/UNSTABLE PRE-FRONTAL AIRMASS IS EXPECTED...AND WITH FAVORABLE
SHEAR -- INCLUDING MID-LEVEL FLOW IN EXCESS OF 50 KT -- ATOP THE
FRONTAL ZONE...THE OVERALL ENVIRONMENT APPEARS FAVORABLE FOR AN
ACTIVE SEVERE WEATHER EVENT.

ENHANCED SEVERE POTENTIAL SHOULD SPREAD EWD INTO THE MS VALLEY
REGION DAY 5 /SAT. THE 25TH/...WITH A SIMILARLY FAVORABLE KINEMATIC
AND THERMODYNAMIC ENVIRONMENT LIKELY NEAR/AHEAD OF THE ADVANCING
FRONT. BOTH DAYS...LARGE HAIL AND DAMAGING WINDS WILL BE
POSSIBLE...WHILE THE MOIST BOUNDARY LAYER AND FAVORABLY-STRONG SHEAR
ARE ALSO INDICATIVE OF TORNADO POTENTIAL.

COMBINATION OF THE DECREASING MODEL AGREEMENT AND VEERING LOW-LEVEL
FLOW DAY 6 ACROSS THE SOUTHEAST AS THE UPPER SYSTEM TURNS MORE NELY
PRECLUDES THE ISSUANCE OF A THREAT AREA. NONETHELESS...SOME SEVERE
POTENTIAL WILL LIKELY EXIST -- PARTICULARLY E OF THE MS AND S OF THE
OH VALLEYS.

..GOSS.. 04/20/2010

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DAY3SVR: Nws Storm Prediction Center Norman Ok

ACUS03 KWNS 200728
SWODY3
SPC AC 200727

DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0227 AM CDT TUE APR 20 2010

VALID 221200Z - 231200Z

...THERE IS A SLGT RISK OF SVR TSTMS FROM SWRN KS SWD INTO PARTS OF
WRN AND CENTRAL TX...

...SYNOPSIS...
LARGE WRN UPPER LOW/TROUGH IS FORECAST TO EXPAND WITH TIME WHILE
SHIFTING SLOWLY EWD ACROSS THE INTERMOUNTAIN WEST. MEANWHILE
FARTHER E...THE PERSISTENT TROUGH OVER ERN NOAM SHOULD TAKE ON A
MORE NEGATIVE TILT WITH TIME WHILE ALSO PROGRESSING EWD.

AT THE SURFACE...A COLD FRONT WILL CONTINUE CROSSING THE ROCKIES
AHEAD OF THE WRN UPPER SYSTEM...SHIFTING INTO THE HIGH PLAINS DURING
THE AFTERNOON/EVENING AND EVENTUALLY OVERTAKING A SRN PLAINS DRYLINE
OVERNIGHT. THE ADVANCE OF THIS STORM SYSTEM INTO THE PLAINS WILL
SUPPORT A SUBSTANTIAL INCREASE IN SEVERE WEATHER ACTIVITY THIS
PERIOD.

...SWRN KS SWD INTO PARTS OF WRN AND CENTRAL TX...
AS THE UPPER RIDGE AXIS FINALLY BEGINS SHIFTING E OF THIS REGION
AHEAD OF THE ADVANCING UPPER SYSTEM...EXPECT MORE ACTIVE AFTERNOON
STORM DEVELOPMENT -- NEAR A SURFACE LOW INVOF SERN CO AND SWD ALONG
THE TRAILING TROUGH/DRYLINE WHICH SHOULD BE MOVING ACROSS THE TX/OK
PANHANDLES AND TX SOUTH PLAINS/TRANSPECOS REGIONS DURING THE
AFTERNOON. AIRMASS AHEAD OF THE TROUGH/DRYLINE WILL BE
DESTABILIZING THROUGH THE AFTERNOON...AS CONTINUED NWD ADVECTION OF
LOW TO MID 60S DEWPOINTS ACROSS THE SRN PLAINS COMBINES WITH DIURNAL
HEATING TO YIELD AN AXIS OF 1000 TO 2000 J/KG MIXED-LAYER CAPE.
THIS HEATING/DESTABILIZATION COMBINED WITH THE APPROACH OF THE WRN
UPPER TROUGH/EWD RETREAT OF THE RIDGE WILL RESULT IN A WEAKENING CAP
-- AND EVENTUALLY STORM DEVELOPMENT BY MID TO LATE AFTERNOON.

AS STRONGER MID-LEVEL SWLYS SPREAD SLOWLY EWD ACROSS THE HIGH PLAINS
ATOP LOW-LEVEL SELYS...SHEAR PROFILES WILL BECOME QUITE SUPPORTIVE
OF UPDRAFT ROTATION ALONG THE TROUGH/DRYLINE. THEREFORE...IT
APPEARS THAT AT LEAST A FEW SIGNIFICANT SEVERE/SUPERCELL STORMS WILL
EVOLVE DURING THE LATE AFTERNOON AND INTO THE EARLY EVENING HOURS.
VERY LARGE HAIL APPEARS TO BE THE MAIN SEVERE THREAT...THOUGH
LOCALLY-DAMAGING WINDS AND A COUPLE OF TORNADOES WILL ALSO BE
POSSIBLE.

OVERNIGHT...STORMS MAY BECOME MORE LINEARLY-ORGANIZED AS A COLD
FRONT OVERTAKES THE DRYLINE. SEVERE THREAT SHOULD CONTINUE INTO THE
OVERNIGHT AHEAD OF THE FRONT/DRYLINE. SOME THREAT MAY ALSO EXPAND
NWD -- MAINLY IN THE FORM OF HAIL AS ELEVATED CONVECTION INCREASES
IN CONJUNCTION WITH A STRENGTHENING NOCTURNAL LOW-LEVEL JET.

..GOSS.. 04/20/2010

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KCRP [200611]: Preliminary Local Storm Report

NWUS54 KCRP 200611
LSRCRP

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
110 AM CDT TUE APR 20 2010

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

0313 PM FLOOD 4 NW DRISCOLL 27.71N 97.80W
04/19/2010 NUECES TX DEPT OF HIGHWAYS

FM 2826 IS CLOSED BETWEEN FM 666 AND U.S. 77...DUE TO
FLOODING FROM PETRONILA CREEK

&&

$$

JR

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KCRP [200610]: Preliminary Local Storm Report...summary

NWUS54 KCRP 200610
LSRCRP

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
110 AM CDT TUE APR 20 2010

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

0515 PM TORNADO 6 W KINGSVILLE 27.51N 97.96W
04/17/2010 F0 KLEBERG TX TRAINED SPOTTER

TRAINED SPOTTER REPORTED A TORNADO ON KING RANCH SOUTH OF
HIGHWAY 141. A DEBRIS CLOUD WITH DUST WAS VISIBILE. THE
TORNADO TOUCHED DOWN ROUGHLY 4 MILES WEST OF THE ENTRACE
TO THE KING RANCH...AND WAS ON THE GROUND FOR ROUGHLY 1/2
MILE AS IT MOVED SOUTH. MINOR DAMAGE OF ROOFING TIN ALONG
WITH TWISTED MESQUITE TREES WAS REPORTED. WINDS WERE
ESTIMATED BETWEEN 65 AND 85 MPH.

&&

$$

JR

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DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 200551
SWODY2
SPC AC 200549

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1249 AM CDT TUE APR 20 2010

VALID 211200Z - 221200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
A LARGE UPPER LOW INITIALLY CENTERED OVER CA IS EXPECTED TO MAKE
SLOW ESEWD PROGRESS WITH TIME...WITH THE CENTER OF CIRCULATION
EXPECTED TO REACH SRN NV LATE. MEANWHILE...BROAD/COMPLEX TROUGHING
IS PROGGED TO REMAIN IN PLACE OVER THE ERN HALF OF NOAM.

AT THE SURFACE...A COLD FRONT ASSOCIATED WITH THE WRN UPPER LOW WILL
CONTINUE PROGRESSING EWD ACROSS THE INTERMOUNTAIN WEST...WHILE A
WARM FRONT LIFTS NWD ACROSS THE SRN PLAINS. FARTHER E...A
WEAK/ARCING COLD FRONT SHOULD MOVE SLOWLY EWD ACROSS THE NORTHEAST
AND SWD ACROSS THE MIDWEST/OH VALLEY REGION THROUGH 22/12Z.

...CO FRONT RANGE SEWD INTO WRN OK/WRN N TX...
SHORT-WAVE RIDGING ALOFT IS FORECAST TO RESIDE OVER THE HIGH
PLAINS...AND WILL SPREAD EWD INTO THE CENTRAL AND SRN PLAINS REGION
DURING THE PERIOD. RESULTING SUBSIDENCE WILL CONTRIBUTE TO A CAPPED
BOUNDARY LAYER...WHILE MODEST BOUNDARY LAYER MOISTURE /SURFACE
DEWPOINTS MAINLY IN THE 50S/ WILL LIMIT DESTABILIZATION ACROSS MOST
OF THIS REGION.

LOW-LEVEL ASCENT AND LOCALLY-GREATER DESTABILIZATION IS EXPECTED TO
FOCUS NEAR A WEAK WARM FRONT FORECAST TO EXTEND ACROSS THE TX
PANHANDLE AND INTO THE RED RIVER VALLEY REGION DURING THE AFTERNOON.
WITH 500 TO 1000 J/KG MIXED-LAYER CAPE LIKELY TO DEVELOP BY
AFTERNOON...LOW-LEVEL ASCENT -- BOTH NEAR THE FRONT AND IN SELY
LOW-LEVEL UPSLOPE REGIME OVER SERN CO JUST N OF THE BOUNDARY -- MAY
BE SUFFICIENT TO LOCALLY ERODE THE CAPPING INVERSION LEADING TO
ISOLATED STORM DEVELOPMENT.

WHILE MID-LEVEL FLOW SHOULD REMAIN RELATIVELY WEAK...LOW-LEVEL SELYS
BENEATH THE MORE WLY FLOW FIELD ALOFT SUGGEST VERTICAL SHEAR
PROFILES SUFFICIENT FOR ORGANIZED/POSSIBLY ROTATING UPDRAFTS. THUS
-- ISOLATED THREAT FOR WIND/HAIL WITH A FEW STRONGER CELLS WARRANTS
THE INCLUSION OF 5% SEVERE PROBABILITY THIS FORECAST.

..GOSS.. 04/20/2010

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 200509
SWODY1
SPC AC 200507

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1207 AM CDT TUE APR 20 2010

VALID 201200Z - 211200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...

THE PRIMARY FEATURE OF INTEREST THIS PERIOD IS AN INTENSE MID AND
UPPER-LEVEL TROUGH WHICH WILL EVOLVE INTO A CLOSED SYSTEM WHILE
DEVELOPING SEWD FROM THE WEST COAST INTO THE GREAT BASIN. AN
ASSOCIATED SURFACE LOW IS FORECAST TO DEEPEN OVER NRN NV TODAY
BEFORE DEVELOPING NWD INTO SWRN ID TONIGHT. A TRAILING PACIFIC
FRONT WILL SHIFT EWD FROM THE VICINITY OF THE WA/ORE/NRN CA COASTS
INTO THE GREAT BASIN AND LOWER CO VALLEY DURING THE FORECAST
PERIOD.

FARTHER E...A VORTICITY MAXIMUM CURRENTLY OVER SERN MT WILL
GRADUALLY WEAKEN WHILE TRANSLATING SEWD INTO AN INCREASINGLY
CONFLUENT MIDLEVEL FLOW REGIME OVER THE CNTRL PLAINS. AN ASSOCIATED
COLD FRONTAL SEGMENT WILL SAG SWD THROUGH THE CNTRL HIGH PLAINS IN
CONCERT WITH THE PASSING UPPER SYSTEM.

...CNTRL/SRN HIGH PLAINS...

00Z MESOSCALE MODEL GUIDANCE IS IN RELATIVELY GOOD AGREEMENT IN
SUGGESTING THAT THE GLANCING INFLUENCE OF ABOVE-MENTIONED VORTICITY
MAXIMUM WILL SERVE TO FOCUS SCATTERED TSTMS ALONG AND AHEAD OF THE
COLD FRONT MOVING SWD THROUGH ERN CO...SWRN NEB AND WRN KS. THE
AMBIENT AIR MASS WILL FEATURE RELATIVELY STEEP LAPSE RATES AND
BOUNDARY LAYER DEWPOINTS IN THE 40S TO AROUND 50 F...CONTRIBUTING TO
AFTERNOON MLCAPE OF AROUND 1000 J/KG. SIMILAR TO PREVIOUS
DAYS...THE WIND FIELD WILL NOT BE PARTICULARLY STRONG...BUT WILL
STILL EXHIBIT SELY SURFACE WINDS VEERING TO NWLY IN THE MID- AND
HIGH-LEVELS WITH 30-40 KT OF DEEP-LAYER SHEAR.

INITIAL STORM MODE MAY EXHIBIT PERIODIC SUPERCELLULAR
CHARACTERISTICS BEFORE ACTIVITY GROWS UPSCALE INTO A
FORWARD-PROPAGATING MCS. HAIL AND STRONG WIND GUSTS WILL BE
POSSIBLE WITH THE STRONGEST STORMS THROUGH THIS EVENING.
HOWEVER...IT APPEARS THAT THE SOMEWHAT COOL BOUNDARY LAYER
TEMPERATURES AND MARGINAL LOW-LEVEL MOISTURE/INSTABILITY MAY TEMPER
THE POTENTIAL FOR A MORE ORGANIZED SEVERE EVENT. SHOULD LATER DATA
INDICATE STRONGER INSTABILITY THAN IS CURRENTLY FORECAST...AN
UPGRADE TO SLIGHT RISK MAY BE NECESSARY.

FARTHER S...ADDITIONAL STORMS WILL BE POSSIBLE ALONG THE LEE TROUGH
NEAR THE TX/NM BORDER...OR ALONG THE RATON MESA. COMPARABLY WARMER
MIDLEVEL TEMPERATURES WILL YIELD A SLIGHTLY MORE STABLE AIR MASS
THAN POINTS TO THE N...THOUGH THE STRONGER STORMS WILL STILL BE
CAPABLE OF SOME HAIL AND LOCALLY GUSTY WINDS.

...NRN NV/SERN ORE/SWRN ID...

DESPITE THE PRESENCE OF A RELATIVELY DRY AIR MASS /I.E. PW VALUES
LESS THAN .75-.50 INCH/...STEEPENING MIDLEVEL LAPSE RATES/DYNAMIC
COOLING ASSOCIATED WITH THE UPPER TROUGH WILL CONTRIBUTE TO POCKETS
OF WEAK INSTABILITY AHEAD OF THE PACIFIC FRONT THIS AFTERNOON. THE
STRONG DYNAMIC FORCING FOR ASCENT COUPLED WITH MESOSCALE LIFT ALONG
THE COLD FRONT MAY FOSTER SCATTERED...LOW-TOPPED TSTMS THIS
AFTERNOON INTO EVENING WHICH WILL MOVE RAPIDLY NNEWD WITHIN
STRENGTHENING DEEP-LAYER WIND FIELD. HAIL AND STRONG WIND GUSTS MAY
ACCOMPANY THESE STORMS THROUGH THE EVENING GIVEN THE STEEP LAPSE
RATES AND COOL THERMODYNAMIC PROFILES.

..MEAD/SMITH.. 04/20/2010

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