Tuesday, April 10, 2007

MESO: Mesoscale Discussion 0448

ACUS11 KWNS 110326
SWOMCD
SPC MCD 110325
FLZ000-110530-

MESOSCALE DISCUSSION 0448
NWS STORM PREDICTION CENTER NORMAN OK
1025 PM CDT TUE APR 10 2007

AREAS AFFECTED...FLA KEYS

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 110325Z - 110530Z

ISOLATED SVR WIND/TORNADO THREAT WILL EXIST OVER THE FLA KEYS OVER
THE NEXT SEVERAL HRS. WW IS NOT ANTICIPATED DUE TO THE LIMITED
COVERAGE OF SVR THREAT OVER LAND.

AN OUTFLOW BOUNDARY WAS NOTED OVER FAR SRN MAINLAND MONROE
COUNTY/MIAMI-DADE COUNTY. THIS BOUNDARY SHOULD CONTINUE TO SLOWLY
MOVE SWD OVER THE NEXT FEW HRS INTO THE UPPER FLA KEYS.
MEANWHILE...RECENT VWP DATA FROM THE 88-D RADAR AT KEY WEST SHOWS AN
INCREASINGLY STRONG LOW LEVEL JET /50 KTS/ CENTERED AROUND 1 KM.
THIS IS 20 KTS STRONGER THAN ANY SHORT TERM MODELS SOLUTIONS HAVE
INDICATED. WITH THIS STRONGER LOW LEVEL JET...LOW LEVEL SHEAR HAS
INCREASED DRAMATICALLY FROM THE 00Z EYW SOUNDING /TO AROUND 300
M2/S2 OF 0-1KM SRH/. SEVERAL SUPERCELLS HAVE DEVELOPED N-NE OF THE
DRY TORTUGAS IN RESPONSE TO APPROACHING UPPER WAVE...SUFFICIENTLY
STRONG DEEP LAYER SHEAR PROFILES AND MODERATE INSTABILITY /2000 J/KG
OF MUCAPE/. WITH THE STRENGTH OF THE LOW LEVEL SHEAR IN
PLACE...ISOLATED DMGG WIND GUSTS AND/OR WEAK TORNADO MAY OCCUR WITH
THESE SUPERCELLS OVER THE OFFSHORE WATERS AND MIDDLE/UPPER FLA KEYS
OVER THE NEXT SEVERAL HRS AS THEY INTERACT WITH THE OUTFLOW
BOUNDARY.

.CROSBIE.. 04/11/2007

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

ATTN...WFO...MFL...KEY...

25358027 25238070 25188139 24988173 24778182 24658092
24858038

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Many Changes Afoot...

Yes, it does look different. Working on three-column design, then re-coloring page. Learning html code bit by bit. Found out how to widen frames, so I'll be working on that next.

Got the automatic feeds coming in. Can actually forward email to the blog, this time.

Come back and see the changes.......tomorrow

WATCHES: Severe Thunderstorm Watch - Number 121

WWUS20 KWNS 110303
SEL1
SPC WW 110303
OKZ000-TXZ000-110300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH - NUMBER 121
NWS STORM PREDICTION CENTER NORMAN OK
1003 PM CDT TUE APR 10 2007

THE NWS STORM PREDICTION CENTER HAS CANCELLED
SEVERE THUNDERSTORM WATCH NUMBER 121 ISSUED AT 340 PM CDT FOR PORTIONS OF

OKLAHOMA
TEXAS

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MESO: Mesoscale Discussion 0447

ACUS11 KWNS 110219
SWOMCD
SPC MCD 110219
ARZ000-TXZ000-OKZ000-110315-

MESOSCALE DISCUSSION 0447
NWS STORM PREDICTION CENTER NORMAN OK
0919 PM CDT TUE APR 10 2007

AREAS AFFECTED...PARTS OF SERN OK...NE TX...SW AR

CONCERNING...SEVERE THUNDERSTORM WATCH 121...

VALID 110219Z - 110315Z

AN ADDITIONAL WW IS NOT ANTICIPATED...BUT CONVECTIVE TRENDS WILL
CONTINUE TO BE MONITORED. REMAINING VALID PORTION OF WW 121 MAY BE
ALLOWED TO EXPIRE AT 03Z.

WITH ONSET OF SURFACE COOLING...INHIBITION HAS INCREASED FOR
BOUNDARY LAYER BASED PARCELS NEAR TRIPLE POINT LOW SOUTHEAST OF
LAWTON...AND EAST SOUTHEASTWARD ALONG WARM FRONT NEAR THE RED RIVER.
RECENT TRENDS SUGGEST THAT STRONGER MID-LEVEL FORCING... SPREADING
TOWARD THE OZARK PLATEAU...IS SHIFTING AWAY FROM THE SURFACE
BOUNDARY...AS IT HAS BECOME APPARENT THAT EVEN SOUTHERN MOST
CELL...SOUTH SOUTHWEST OF MCALESTER...HAS BECOME ELEVATED ABOVE WARM
FRONTAL INVERSION LAYER. LOCALIZED/SPORADIC DAMAGING WIND GUSTS
COULD ACCOMPANY THIS STORM NORTH OF THE RED RIVER INTO AREAS NORTH
OF TEXARKANA AR BY 04-05Z...BUT THE RISK FOR A BROADER SCALE
DAMAGING WIND EVENT NOW SEEMS NEGLIGIBLE. HOWEVER...GIVEN STRONGLY
SHEARED REGIME...WITH MOST UNSTABLE CAPE OF 500 TO 1000 J/KG...HAIL
NEAR OR JUST ABOVE SEVERE LIMITS MAY CONTINUE TO ACCOMPANY STRONGEST
CONVECTION.

.KERR.. 04/11/2007

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

ATTN...WFO...LZK...SHV...TSA...FWD...OUN...

34999717 35499629 35579489 35089400 33969362 33499397
33309442 33509534 33849683 34049707

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 110101
SWODY1
SPC AC 110059

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0759 PM CDT TUE APR 10 2007

VALID 110100Z - 111200Z

..THERE IS A SLGT RISK OF SVR TSTMS ACROSS PARTS OF SERN OK...NERN
TX...AND SWRN AR...

..SERN OK/NERN TX INTO SWRN AR...
SCATTERED SHOWERS AND THUNDERSTORMS -- INCLUDING A COUPLE OF
SUPERCELLS OVER S CENTRAL OK -- HAVE DEVELOPED THIS AFTERNOON IN
MARGINALLY-UNSTABLE AIRMASS INVOF WARM FRONT NOW DRAPED FROM S
CENTRAL OK ESEWD ACROSS THE RED RIVER INTO NERN TX. THOUGH AIRMASS
WILL LIKELY REMAIN CAPPED S OF THIS FRONT...A CLUSTER OF STORMS WILL
LIKELY PERSIST/MOVE EWD ACROSS SERN OK/NERN TX INTO AR OVER THE NEXT
SEVERAL HOURS. GREATEST THREAT FOR LOCALLY-DAMAGING WINDS AND AN
ISOLATED TORNADO OR TWO WILL LIKELY EXIST FOR ONLY THE NEXT 1-2
HOURS OVER S CENTRAL OK...AS STORMS ARE NOW NEARING THE ERN FRINGE
OF SURFACE-BASED INSTABILITY AXIS. HOWEVER...WHILE STORMS SHOULD
BECOME INCREASINGLY-ELEVATED AS THEY SHIFT EWD
OVERNIGHT...SUFFICIENT INSTABILITY AND SHEAR EXIST FOR A CONTINUED
THREAT FOR HAIL WITH ORGANIZED/ROTATING STORMS.

..S FL...
WIDESPREAD THUNDERSTORMS CONTINUE FROM THE ERN GULF INTO S FL...WITH
STRONG STORMS INDICATED FROM BROWARD COUNTY WSWWD INTO THE GULF N OF
THE KEYS ATTM. EVENING MFL /MIAMI FL/ RAOB SHOWS MINIMAL
INSTABILITY DUE TO WEAK MID-LEVEL LAPSE RATES...AND WITH OUTFLOW
BOUNDARY CONTINUING TO MOVE SWD ACROSS MIAMI-DADE AND MONROE
COUNTIES...SURFACE-BASED SEVERE THREAT SHOULD CONTINUE TO DECREASE.
HOWEVER...WITH FAVORABLE DEEP-LAYER SHEAR SUPPORTIVE OF ORGANIZED
UPDRAFTS...A FEW STRONGER STORMS MAY CONTINUE INTO THE OVERNIGHT
HOURS...ACCOMPANIED BY A MARGINAL HAIL THREAT -- PARTICULARLY S OF
THE PENINSULA INTO THE KEYS WHERE GREATER INSTABILITY IS INDICATED.

.GOSS.. 04/11/2007

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MESO: Mesoscale Discussion 0446

ACUS11 KWNS 110052
SWOMCD
SPC MCD 110052
OKZ000-TXZ000-110215-

MESOSCALE DISCUSSION 0446
NWS STORM PREDICTION CENTER NORMAN OK
0752 PM CDT TUE APR 10 2007

AREAS AFFECTED...PARTS OF SRN OK...NRN TX

CONCERNING...SEVERE THUNDERSTORM WATCH 121...

VALID 110052Z - 110215Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 121
CONTINUES. TRENDS ARE BEING MONITORED FOR THE POSSIBILITY OF AN
ADDITIONAL WW.

SUPERCELL EAST OF LAWTON PROBABLY BECAME ROOTED IN MOIST BOUNDARY
LAYER NEAR TRIPLE POINT LOW...WHERE MIXED LAYER CAPE BRIEFLY REACHED
1000 J/KG. WITH ONSET OF SURFACE COOLING ALONG/WEST OF DRY LINE
NEXT FEW HOURS...AND SOUTHWARD ADVANCEMENT OF COLD FRONT... BOUNDARY
LAYER INSTABILITY WILL DECREASE. HOWEVER...CONVECTIVE DEVELOPMENT
SEEMS LIKELY TO INCREASE IN COVERAGE THIS EVENING...AS STRENGTHENING
LOW-LEVEL JET ENHANCES WARM ADVECTION NORTHEAST OF SURFACE LOW
TRACKING THROUGH THE RED RIVER VALLEY. THIS IS JUST AHEAD OF
STRONGER MID/UPPER FORCING...WHICH IS IN THE PROCESS OF TURNING
EASTWARD ACROSS THE SOUTH CENTRAL PLAINS...TOWARD THE OZARK PLATEAU.
THE NUMBER OF HAIL PRODUCING STORMS MAY INCREASE...AT LEAST A
BIT...ACROSS CENTRAL/EASTERN OKLAHOMA THROUGH 03-06Z. A SMALL
ORGANIZED CONVECTIVE SYSTEM MAY PERSIST ON THE SOUTHERN FLANK STORM
CLUSTER...NEAR WARM FRONT. AND...IF THIS OCCURS...DAMAGING WIND
POTENTIAL COULD INCREASE IN A RELATIVELY NARROW SWATH NEAR THE RED
RIVER.

.KERR.. 04/11/2007

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

ATTN...WFO...SHV...TSA...FWD...OUN...

34839777 35429744 35679695 35819627 35739553 35519488
34309460 33799493 33869646 34289773

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MESO: Mesoscale Discussion 0445

ACUS11 KWNS 102302
SWOMCD
SPC MCD 102302
OKZ000-TXZ000-110030-

MESOSCALE DISCUSSION 0445
NWS STORM PREDICTION CENTER NORMAN OK
0602 PM CDT TUE APR 10 2007

AREAS AFFECTED...PARTS OF CNTRL/SRN OK

CONCERNING...SEVERE THUNDERSTORM WATCH 121...

VALID 102302Z - 110030Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 121
CONTINUES.

80 KT 500 MB WEST NORTHWESTERLY MID-LEVEL JET STREAK CONTINUES TO
DIG ACROSS THE SOUTH CENTRAL ROCKIES. THE LEADING EDGE OF STRONGER
MID-LEVEL COOLING/LIFT IN LEFT EXIT REGION OF THIS FEATURE IS NOW
SPREADING ACROSS WESTERN OKLAHOMA...WHERE LOW-LEVEL WARM ADVECTION
IS FOCUSING STRONGER LIFT ALONG WARM FRONT NORTH/NORTHEAST OF
SURFACE LOW. DEEP LAYER SHEAR IS STRONG AND SUPPORTIVE OF
SUPERCELLS...BUT CONVECTIVE DEVELOPMENT TO THIS POINT APPEARS TO
HAVE BEEN SLOWED BY WEAK INSTABILITY.

HOWEVER...ACTIVITY NEXT FEW HOURS WILL CONTINUE TO DEVELOP EAST
SOUTHEASTWARD WITH STRONGER FORCING TOWARD BETTER LOW-LEVEL MOIST
RETURN FLOW...EAST OF LAWTON/ WICHITA FALLS. THUS...
INTENSIFICATION OF THUNDERSTORM ACTIVITY STILL SEEMS PROBABLE IN
INCREASINGLY UNSTABLE ENVIRONMENT ACROSS SOUTH CENTRAL OKLAHOMA
THROUGH AT LEAST THE 01-02Z. A FEW SEVERE STORMS ARE
POSSIBLE...PRIMARILY WITH LARGE HAIL/GUSTY WINDS.

.KERR.. 04/10/2007

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

ATTN...WFO...FWD...OUN...

35049869 35109830 34929765 34599709 33999713 33849768
34059836 34599874

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WATCHES: Severe Thunderstorm Watch Number 121

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Subject: WATCHES: Severe Thunderstorm Watch Number 121
-------------------------------------------------------------------------------

WWUS20 KWNS 102042
SEL1
SPC WW 102042
OKZ000-TXZ000-110300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 121
NWS STORM PREDICTION CENTER NORMAN OK
340 PM CDT TUE APR 10 2007

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

SOUTHWEST OKLAHOMA
NORTHWEST TEXAS

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 340 PM UNTIL
1000 PM CDT.

HAIL TO 2 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST OF
ALTUS OKLAHOMA TO 30 MILES NORTH NORTHEAST OF SHERMAN TEXAS. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

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...ISOLATED THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS
AFTERNOON OVER SOUTHWEST OK AND NORTHWEST TX...AHEAD OF DEEP SURFACE
LOW AND ALONG SURFACE WARM FRONT. THESE STORMS ARE EXPECTED TO
TRACK EAST-SOUTHEASTWARD IN VICINITY OF THE RED RIVER THROUGH THE
EVENING. AREAL COVERAGE OF STORMS MAY BE RATHER LIMITED.
HOWEVER...MLCAPE VALUES AROUND 1000 J/KG...COOL TEMPERATURES
ALOFT...STEEP LAPSE RATES...AND SUFFICIENT SHEAR FOR SUPERCELL
STORMS WILL SUPPORT A RISK OF LARGE HAIL ACROSS THE REGION.

AVIATION...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 400. MEAN STORM
MOTION VECTOR 28035.


..HART

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MESO: Mesoscale Discussion 0444

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Subject: MESO: Mesoscale Discussion 0444
-------------------------------------------------------------------------------

ACUS11 KWNS 101952
SWOMCD
SPC MCD 101952
OKZ000-TXZ000-102115-

MESOSCALE DISCUSSION 0444
NWS STORM PREDICTION CENTER NORMAN OK
0252 PM CDT TUE APR 10 2007

AREAS AFFECTED...ERN TX PANHANDLE...SWRN OK...EXTREME N-CNTRL TX.

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 101952Z - 102115Z

THE SEVERE THREAT WILL INCREASE ACROSS PORTIONS OF THE RED RIVER
VALLEY AS ISOLATED TO WIDELY SCATTERED TSTMS ARE EXPECTED TO DEVELOP
BY 21Z. STRONG DEEP-LAYER SHEAR WILL BE SUPPORTIVE OF SUPERCELL
DEVELOPMENT WITH SEVERE WIND GUSTS AND LARGE HAIL THE MAIN THREATS.
THE AREA WILL BE MONITORED FOR A POSSIBLE WW.

AT 19Z...A SURFACE LOW WAS LOCATED AROUND 50 E AMA...WITH A COLD
FRONT ARCING W/NWWD INTO NERN NM AND A WARM FRONT ARCING E/SEWD
ACROSS SWRN OK INTO N-CNTRL TX. AGITATED CU DEVELOPMENT HAS OCCURRED
TO THE NW OF THE SURFACE LOW...AHEAD OF A SHORTWAVE TROUGH NOW
CROSSING THE TX PANHANDLE. 18Z RUC FORECAST SOUNDINGS INDICATE A
WEAKLY UNSTABLE AIR MASS /MLCAPES AOB 500 J/KG/ WILL BECOME UNCAPPED
IN VICINITY OF THE SURFACE LOW AFTER 20Z. DESPITE THE MEAGER
INSTABILITY...STRONG KINEMATIC FIELDS THROUGH THE ATMOSPHERIC COLUMN
SHOULD SUPPORT STORM ORGANIZATION. 19Z RUC OBJECTIVE ANALYSIS
INDICATES EFFECTIVE SHEAR HAS REACHED 40 TO 50 KTS. THIS SHOULD
INCREASE TO 50 TO 60 KTS AS DAYTIME HEATING PEAKS. VERY STEEP
LOW-LEVEL LAPSE RATES WILL SUPPORT A DAMAGING WIND THREAT ACROSS THE
ERN TX PANHANDLE WHERE SURFACE DEW POINT DEPRESSIONS OF 35 TO 45
DEGREES EXISTS ALONG WITH WLY GRADIENT WINDS OF 25 TO 35 MPH
IMPINGING EWD. FARTHER E TOWARDS THE WARM FRONT...THE AIR MASS WILL
BE MORE MOIST. THUS...LARGE HAIL WILL LIKELY BE A GREATER THREAT
TOWARDS S-CNTRL OK/N-CNTRL TX.

.GRAMS.. 04/10/2007

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

ATTN...WFO...OUN...LUB...AMA...

34169994 34420048 34860092 35290086 35740026 35769947
35339850 34969795 34219784 33889835 34009924

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DAY1SVR: Day 1 Convective Outlook

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-------------------------------------------------------------------------------

ACUS01 KWNS 101944
SWODY1
SPC AC 101942

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0242 PM CDT TUE APR 10 2007

VALID 102000Z - 111200Z

..THERE IS A SLGT RISK OF SVR TSTMS ACROSS PORTIONS OF SOUTH FL...

..THERE IS A SLGT RISK OF SVR TSTMS NEAR THE RED RIVER OF OK/TX...

..SOUTH FL...

LONG LIVED MCS CONTINUES ITS EWD MOVEMENT TOWARD THE WRN FL
PENINSULA THIS AFTERNOON...WHILE A MCV HAS EVOLVED WITHIN LARGER
THUNDERSTORM COMPLEX ROUGHLY 40 SW SRQ. ADDITIONALLY...SCATTERED
SUPERCELLS HAVE EVOLVED ALONG E-W FRONTAL ZONE FROM SARASOTA TO ST.
LUCIE COUNTY WHILE PARTIAL SUNSHINE HAS ALLOWED SIGNIFICANT BOUNDARY
LAYER DESTABILIZATION TO OCCUR ACROSS THE WARM SECTOR. ALTHOUGH LOW
LEVEL FLOW IS RELATIVE WEAK...IT APPEARS SUFFICIENT CONVERGENCE WILL
BE MAINTAINED AHEAD OF EWD-MOVING MCS FOR ADDITIONAL THUNDERSTORM
DEVELOPMENT...A FEW OF WHICH SHOULD BE SUPERCELLULAR IN NATURE.
LARGE HAIL IS THE PREDOMINATE SEVERE THREAT...ALTHOUGH AN ISOLATED
TORNADO CAN NOT BE RULED OUT DUE TO MARITIME TROPICAL AIRMASS AND
EXISTENCE OF AFOREMENTIONED BOUNDARY.

..RED RIVER OF TX/OK...

VERY STEEP LAPSE RATES HAVE DEVELOPED IN THE LOWEST 3 KM WITHIN POST
DRY LINE ENVIRONMENT OVER THE TX PANHANDLE...IMMEDIATELY AHEAD OF
COLD FRONT. ROBUST HIGH BASED THERMALS ARE NOW MOISTENING AND
DEEPENING AS EVIDENT BY EXPANDING CU FIELD...ESPECIALLY ACROSS THE
CNTRL TX PANHANDLE INTO THE TX SOUTH PLAINS. BACK EDGE OF THICKER
STRATUS IS GRADUALLY SHIFTING EAST ACROSS SWRN OK INTO NCNTRL TX
WHICH WILL ALLOW MOIST SECTOR TO BEGIN TO DESTABILIZE OVER THE NEXT
FEW HOURS. WITH CDS NOW 80 F...IT APPEARS CU WILL BEGIN TO DEVELOP
ALONG/EAST OF THE DRY LINE. FORECAST SOUNDINGS FAVOR SUPERCELL
STRUCTURES WITH DEEP LAYER SHEAR ON THE ORDER OF 45-60KT. LATEST
THINKING IS THUNDERSTORMS WILL EVOLVE NEAR THE TX/OK
BORDER...POSSIBLY POST DRY LINE ALONG THE COLD FRONT BY 22Z...THEN
MOVE/DEVELOP SEWD AT ROUGHLY 40 KT AHEAD OF REORGANIZING SFC LOW.
STEEP LAPSE RATE ENVIRONMENT FAVORS LARGE HAIL AND DAMAGING WINDS
WITH ANY SUPERCELLS THAT EVOLVE NEAR THE RED RIVER THIS EVENING.
SWD DEVELOPMENT INTO NWRN TX WILL BE LIMITED BY WEAKER CONVERGENCE
WITHIN INCREASINGLY VEERED DEEP LAYER FLOW REGIME.

.DARROW.. 04/10/2007

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MESO: Mesoscale Discussion 0443

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Subject: MESO: Mesoscale Discussion 0443
-------------------------------------------------------------------------------

ACUS11 KWNS 101908
SWOMCD
SPC MCD 101908
FLZ000-102015-

MESOSCALE DISCUSSION 0443
NWS STORM PREDICTION CENTER NORMAN OK
0208 PM CDT TUE APR 10 2007

AREAS AFFECTED...S-CNTRL FL

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 101908Z - 102015Z

SCT TSTMS CONTINUE TO DEVELOP ALONG QUASI-STATIONARY FRONT ACROSS
S-CNTRL FL. SUFFICIENT DEEP LAYER SHEAR AND MODEST INSTABILITY WILL
SUPPORT SUPERCELL STRUCTURES WITH LARGE HAIL AS THE MAIN THREAT.
OVERALL SPATIAL AND TEMPORAL EXTENT SHOULD REMAIN LIMITED AS
EXPANSIVE PRECIPITATION SHIELD SPREADS EWD FROM THE ERN GULF OF
MEXICO. THUS...A WW IS UNLIKELY.

19Z SUBJECTIVE SURFACE ANALYSIS PLACES A QUASI-STATIONARY FRONT FROM
NRN LEE COUNTY EWD INTO NRN MARTIN COUNTY. S OF THIS
BOUNDARY...TEMPERATURES HAVE WARMED INTO THE LOWER TO MIDDLE 80S
WITH DEW POINTS HOVERING NEAR 70 AND MLCAPES AROUND 1000 J/KG.
BENEATH AN INTENSE UPPER-LEVEL JET /100 KT TO 300 MB/...EFFECTIVE
BULK SHEAR HAS NOW APPROACHED 40 KTS. AS STORMS BECOME BETTER
ORGANIZED ALONG THE BOUNDARY OVER THE NEXT 2-3 HOURS...SUPERCELLS
CAPABLE OF LARGE HAIL WILL BE POSSIBLE. GIVEN A FAVORABLY WARM/MOIST
LOW-LEVEL ENVIRONMENT...A TORNADO THREAT MAY EXIST WITH ANY DISCRETE
STORM ALONG THE BOUNDARY. HOWEVER...THE OVERALL TORNADO THREAT WILL
LIKELY BE MITIGATED BY RATHER WEAK LOW-LEVEL WINDS /AOB 20 KTS IN
THE LOWEST 2 KM/ PER REGIONAL VAD PROFILERS.

.GRAMS.. 04/10/2007

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

ATTN...WFO...MFL...MLB...TBW...

27288072 27278011 26757987 26327992 25958012 25868078
25978138 26368164 26918150 27248087

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DAY1SVR: Day 1 Convective Outlook

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-------------------------------------------------------------------------------

ACUS01 KWNS 101628
SWODY1
SPC AC 101626

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1126 AM CDT TUE APR 10 2007

VALID 101630Z - 111200Z

..NO SVR TSTM AREAS FORECAST...

MORNING WATER VAPOR IMAGERY SHOWS STRONG MID LEVEL JET MOVING
EASTWARD ACROSS THE ROCKIES AND WESTERN STATES. THIS HAS INDUCED
SURFACE CYCLOGENESIS OVER NORTHEAST NM. THE LOW LEVEL WARM FRONT
EXTENDS EASTWARD FROM THE LOW INTO PARTS OF EAST TX AND LA...THEN
EASTWARD ACROSS CENTRAL FL. THIS BOUNDARY WILL PROVIDE THE FOCUS
FOR THREE AREAS OF LOW PROBABILITY SEVERE RISK TODAY.

..LA...
UPPER SHORTWAVE TROUGH IS CURRENTLY ROTATING EASTWARD ACROSS EAST
TX. SCATTERED THUNDERSTORMS HAVE BEEN OCCURRING THROUGHOUT THE
MORNING AHEAD OF TROUGH IN REGION OF STRONG LOW LEVEL WARM
ADVECTION. SURFACE WARM FRONT REMAINS JUST OFF THE LA COAST...WITH
STORMS OVER LA BEING ELEVATED ATOP STABLE BOUNDARY LAYER.
NEVERTHELESS...VERTICAL SHEAR PROFILES AND MARGINAL ELEVATED CAPE
SUGGEST A RISK OF LOCALLY GUSTY WINDS AND HAIL IN STRONGER CELLS
THROUGH THE MORNING. PASSAGE OF UPPER TROUGH WILL DIMINISH LARGE
SCALE ASCENT DURING THE AFTERNOON...WITH MID LEVEL SUBSIDENCE
INVERSION LIKELY ENDING THE SEVERE THREAT.

..CENTRAL FL...
LARGE CLUSTER OF THUNDERSTORMS HAS DEVELOPED OVERNIGHT OVER THE
CENTRAL/EASTERN GULF OF MEXICO. THE LEADING EDGE OF THE STORMS IS
NOW APPROACHING THE WEST COAST OF THE FL PENINSULA...FOCUSED ALONG
SURFACE WARM FRONT. ISOLATED CELLS EMBEDDED IN THIS MCS HAVE SHOWN
SOME ORGANIZATION...AND MAY REMAIN INTENSE AS THEY MOVE INLAND THIS
AFTERNOON. MORNING OBSERVED AND MODEL FORECAST SOUNDINGS SUGGEST
LOW LEVEL WINDS ARE RATHER WEAK ACROSS THIS ZONE.
HOWEVER...MODERATE INSTABILITY /MLCAPE AROUND 1500 J/KG/ AND STRONG
MID/UPPER LEVEL WIND FIELDS MAY BE SUFFICIENT FOR ISOLATED SEVERE
STORMS. DAMAGING WINDS AND HAIL WOULD BE THE MAIN THREATS.

..NORTHWEST TX/SOUTHWEST OK...
STRONG HEATING IS OCCURRING THIS TODAY ACROSS THE TX PANHANDLE...IN
VICINITY OF DEEPENING SURFACE LOW AND SURFACE WARM FRONT. STEEP
LOW/MID LEVEL LAPSE RATES COMBINED WITH LIFT ASSOCIATED WITH
APPROACHING UPPER JET WILL LIKELY RESULT IN ISOLATED HIGH-BASED
CONVECTION THIS AFTERNOON OVER THE TX PANHANDLE. THIS ACTIVITY WILL
MOVE EAST-SOUTHEASTWARD INTO AN INCREASINGLY MOIST AND UNSTABLE AIR
MASS OVER NORTHWEST TX AND SOUTHWEST OK. LOW LEVEL FORCING ALONG
WARM FRONT AND NEAR SURFACE LOW MAY ENHANCE UPDRAFTS AND RESULT IN
ISOLATED SEVERE STORMS. LARGE HAIL WOULD BE THE MAIN THREAT. AREAL
COVERAGE IS NOT ANTICIPATED TO WARRANT HIGHER SEVERE PROBABILITIES.

.HART/GRAMS.. 04/10/2007

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MESO: Mesoscale Discussion 0442

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Subject: MESO: Mesoscale Discussion 0442
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ACUS11 KWNS 101446
SWOMCD
SPC MCD 101446
LAZ000-TXZ000-101645-

MESOSCALE DISCUSSION 0442
NWS STORM PREDICTION CENTER NORMAN OK
0946 AM CDT TUE APR 10 2007

AREAS AFFECTED...SOUTHEAST TX...SOUTHERN LA

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 101446Z - 101645Z

SCATTERED THUNDERSTORMS WILL PERSIST ACROSS SOUTHEAST TX AND
SOUTHERN LA THROUGH THE MORNING HOURS...WITH A RISK OF GUSTY WINDS
AND HAIL. AREAL COVERAGE OF SEVERE STORMS IS NOT EXPECTED TO
WARRANT A WATCH.

SCATTERED THUNDERSTORMS HAVE BEEN OCCURRING THIS MORNING IN LOW
LEVEL WARM ADVECTION ZONE ACROSS MUCH OF SOUTHEAST TX AND SOUTHERN
LA. LOCAL RADARS HAVE SHOWN MID LEVEL ROTATION IN A FEW OF THE
STORMS. SURFACE ANALYSIS SHOWS THAT PRIMARY WARM FRONT REMAINS JUST
OFF THE LA COAST...WITH BULK OF CONVECTION REMAINING ROOTED ABOVE
STABLE BOUNDARY LAYER. HOWEVER...FORECAST SOUNDINGS AND VAD
PROFILES INDICATE FAVORABLE DEEP LAYER VERTICAL SHEAR AND LAPSE
RATES ALOFT TO SUPPORT CONTINUED ORGANIZED /PERHAPS SUPERCELL/
STORMS. HAIL AND GUSTY WINDS WILL BE POSSIBLE IN STRONGER STORMS
THROUGHOUT THE MORNING. TIMING OF UPPER TROUGH SUGGESTS THAT LARGE
SCALE ASCENT WILL BEGIN TO WEAKEN BY EARLY AFTERNOON...WITH MID
LEVEL SUBSIDENCE INVERSION SETTING IN. LIMITED AREAL COVERAGE OF
INTENSE CONVECTION...ALONG WITH LIMITED TIME FRAME OF
THREAT...SUGGEST AT THIS TIME THAT WW WILL NOT BE NEEDED.

.HART.. 04/10/2007

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

ATTN...WFO...JAN...LIX...LCH...SHV...HGX...

31699394 31149191 30129025 29079037 29149167 29369395
29739443 30989436

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DAY1SVR: Day 1 Convective Outlook

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ACUS01 KWNS 101236
SWODY1
SPC AC 101234

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0734 AM CDT TUE APR 10 2007

VALID 101300Z - 111200Z

..NO SVR TSTM AREAS FORECAST...

..SYNOPSIS...
BROAD BELT OF WESTERLIES UNDERCUTTING NRN CANADIAN RIDGE WILL
MAINTAIN PROGRESSIVE/SHORT WAVELENGTH PATTERN ACROSS THE LWR 48.
SOME AMPLIFICATION APPEARS LIKELY AS NRN STREAM ENERGY CONTINUES TO
STRENGTHEN SHORTWAVE TROUGH NOW APPROACHING THE CNTRL RCKYS...AND
CONTINUED NE MOTION OF NEWFOUNDLAND LOW ALLOWS HEIGHTS TO RISE IN
THE EAST. FARTHER S...TWO WEAKER DISTURBANCES ...ONE NOW OVER CNTRL
TX AND THE OTHER OVER THE NW GULF...SHOULD BECOME ABSORBED IN
STRENGTHENING WSW FLOW DOWNSTREAM FROM RCKYS TROUGH.

AT LWR LEVELS...EXISTING W/E FRONT IN THE NRN GULF IS NOW LIFTING
NWD AS A WARM FRONT IN RESPONSE TO PRESSURE FALLS/LEE TROUGHING
AHEAD OF RCKYS IMPULSE. THE WRN PART OF THIS BOUNDARY SHOULD MOVE
INTO THE LWR MS VLY LATER IN THE PERIOD AS COLD FRONT WITH RCKYS
TROUGH REACHES ERN AR/WRN LA AND SE TX. NWD PROGRESS OF THE GULF
FRONT OVER THE FL AREA MAY BE MORE LIMITED AS WEAKENING UPR
DISTURBANCE INDUCES WEAK WAVE DEVELOPMENT/WIDESPREAD RAINFALL N OF
THE BOUNDARY OVER THE NERN GULF AND CNTRL/NRN FL.

..SRN/ERN LA...
SCTD TSTMS WILL CONTINUE SPREADING NE ACROSS LA TODAY AS LOW-LEVEL
WARM ADVECTION/MOISTURE INFLOW DOWNSTREAM FROM TX DISTURBANCE
FURTHER DESTABILIZE AREA NEAR WARM FRONT. WIDESPREAD NATURE OF
CONVECTION LIKELY WILL LIMIT DEGREE OF SFC HEATING...ALTHOUGH
POCKETS OF GREATER INSTABILITY /WITH MLCAPE AOA 500 J/KG/ MAY
DEVELOP. WITH WSWLY 500 MB FLOW OF 40-45 KTS...AMPLE SHEAR WILL BE
PRESENT FOR SUSTAINED UPDRAFTS/SUPERCELLS...ESPECIALLY AS FRONT
MOVES ASHORE OVER SE LA. IT APPEARS...HOWEVER...THAT THE STRONGEST
LARGE SCALE FORCING FOR ASCENT WILL HAVE MOVED LARGELY E OF LA BY
MID AFTERNOON. COUPLED WITH LIKELIHOOD FOR EXTENSIVE LOW CLOUDS AND
INCREASED CAPPING IN WAKE OF UPR SYSTEM...ONLY LOW CONDITIONAL
SEVERE PROBABILITIES APPEAR WARRANTED ATTM. BRIEF TORNADOES OR
LOCALLY DAMAGING WIND WOULD BE THE PRIMARY CONDITIONAL SEVERE
THREATS WERE SUSTAINED SFC-BASED STORMS TO DEVELOP.

..CNTRL/SRN FL...
WARM FRONT WILL LIFT SLOWLY N ACROSS SRN/CNTRL FL TODAY...POSSIBLY
REACHING A TPA/MLB LINE BY EVENING. APPROACH OF CNTRL GULF UPR
DISTURBANCE/SFC WAVE...AND FAVORABLY-TIMED DIURNAL CYCLE... SUGGEST
THAT TSTMS SHOULD DEVELOP ALONG AND S OF FRONT LATER TODAY. CLOUDS
FROM EXISTING GULF STORMS WILL LIMIT SFC HEATING OVER MUCH OF
FL...AND MID LEVEL LAPSE RATES WILL REMAIN FAIRLY WEAK. BUT
SUFFICIENT INSTABILITY /SBCAPE TO 1000 J/KG/...AND SHEAR /40 KT WSW
FLOW AT 500 MB/ MAY DEVELOP FOR A FEW SUSTAINED STORMS WITH LOCALLY
DAMAGING WIND.

..ERN TX PANHANDLE/SW OK...
A DEEPLY MIXED ENVIRONMENT SHOULD DEVELOP LATER THIS AFTERNOON OVER
THE ERN TX PANHANDLE IN WARM SECTOR OF LEE LOW ASSOCIATED WITH
AMPLIFYING/DIFFLUENT RCKYS TROUGH. STEEP LOW TO MID LEVEL LAPSE
RATES...RELATIVELY DRY BOUNDARY LAYER...AND MODERATE UNIDIRECTIONAL
CLOUD LAYER FLOW MAY SUPPORT DEVELOPMENT OF A HIGH-BASED LINE OF
CONVECTION/STORMS ALONG LEE TROUGH. THIS ACTIVITY MAY YIELD A
STRONG WIND GUST OR TWO AND MARGINALLY SEVERE HAIL BEFORE WEAKENING
AFTER SUNSET.

.CORFIDI/TAYLOR.. 04/10/2007

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DAY1SVR: Day 1 Convective Outlook

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ACUS01 KWNS 100557
SWODY1
SPC AC 100555

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1255 AM CDT TUE APR 10 2007

VALID 101200Z - 111200Z

..NO SVR TSTM AREAS FORECAST...

..SYNOPSIS...
SLIGHT AMPLIFICATION OF THE UPPER PATTERN IS FORECAST THIS
PERIOD...AS SEVERAL SMALL-SCALE FEATURES MOVING INTO THE CENTRAL
THIRD OF THE CONUS RESULT IN MEAN LARGER-SCALE TROUGHING.
MEANWHILE...RIDGING WILL ALSO INCREASE UPSTREAM ACROSS THE
ROCKIES...AS WELL AS DOWNSTREAM ACROSS THE ERN U.S. THROUGH THE
PERIOD.

AT THE SURFACE...LEE TROUGHING AT THE START OF THE PERIOD WILL
TRANSITION INTO AN EWD-MOVING AREA OF LOW PRESSURE WHICH WILL CROSS
THE PLAINS THROUGH THE DAY. MAIN BAROCLINIC ZONE HOWEVER -- AT
LEAST WITH RESPECT TO THE CONVECTIVE FORECAST -- WILL BE A WARM
FRONT MOVING NWD OUT OF THE NRN GULF INTO THE CENTRAL GULF COAST
REGION/LOWER MS VALLEY.

..SRN/ERN LA...
SHOWERS AND THUNDERSTORMS WILL CONTINUE SPREADING NEWD ACROSS LA
DURING THE FIRST HALF OF THE PERIOD...AS LOW-LEVEL WARM ADVECTION --
ASSOCIATED WITH THE PASSAGE OF A SERIES OF WEAK UPPER FEATURES --
AFFECTS THIS REGION. PERSISTENT CONVECTION WILL LIKELY LIMIT THE
POTENTIAL FOR HEATING AND ASSOCIATED DESTABILIZATION DURING THE
AFTERNOON...THOUGH POCKETS OF GREATER INSTABILITY /AROUND 500 J/KG
MEAN-LAYER CAPE/ WILL LIKELY EXIST BY AFTERNOON.

DEGREE OF INSTABILITY SHOULD LIMIT THE OVERALL SEVERE
POTENTIAL...BUT WITH WLY MID-LEVEL FLOW NEAR 40 KT SPREADING ACROSS
THIS REGION...SHEAR SUPPORTIVE OF ORGANIZED UPDRAFTS WILL BE
AVAILABLE. THEREFORE...WILL MAINTAIN LOW PROBABILITY SEVERE
POTENTIAL ACROSS SRN AND ERN LA DESPITE LACK OF CLARITY WITH RESPECT
TO THE DETAILS REGARDING THE EVOLUTION OF THIS CONVECTIVE EVENT.

.GOSS/TAYLOR.. 04/10/2007

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