

568 

WWUS20 KWNS 120544

SEL1

SPC WW 120544

TXZ000-121300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 141

NWS STORM PREDICTION CENTER NORMAN OK

1240 AM CDT SUN APR 12 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST THROUGH WESTERN NORTH TEXAS



EFFECTIVE THIS SUNDAY MORNING FROM 1240 AM UNTIL 800 AM 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHWEST OF

MINERAL WELLS TEXAS TO 15 MILES EAST OF DEL RIO 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.



OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 140. WATCH NUMBER 140 WILL NOT

BE IN EFFECT AFTER 1240 AM CDT.



DISCUSSION...TSTMS EXPECTED TO INCREASE IN STRENGTH THROUGH THE

OVERNIGHT FROM THE BIG BEND REGION NNE ACROSS THE WRN HILL COUNTRY

INTO WRN N TX AS LEAD WAVE OF HEIGHT FALLS ASSOCIATED WITH NM UPR

LOW OVERSPREAD NWRN EDGE OF QUALITY MOISTURE RETURN.  STORMS LIKELY

WILL REMAIN SOMEWHAT ELEVATED...ESPECIALLY WITH NWD EXTENT...BUT

SUFFICIENT MUCAPE LIKELY WILL EXIST FOR SVR HAIL GIVEN PRESENCE OF

SUFFICIENT CLOUD LAYER SHEAR FOR EMBEDDED SUSTAINED STORMS/POSSIBLE

SUPERCELLS.  SOME THREAT WILL ALSO EXIST FOR BOWING

SEGMENTS...ALTHOUGH POTENTIAL FOR ANY ASSOCIATED SVR WIND THREAT AT

THE SFC WILL BE MITIGATED BY LOW LVL STABLE LAYER.



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 450. MEAN STORM

MOTION VECTOR 21040.





...CORFIDI

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