

667 

WWUS20 KWNS 251631

SEL2

SPC WW 251631

TXZ000-252300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 62

NWS STORM PREDICTION CENTER NORMAN OK

1125 AM CDT WED MAR 25 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF CENTRAL AND NORTH TEXAS



EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1125 AM UNTIL

600 PM CDT.



HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES NORTH

NORTHWEST OF SAN ANGELO TEXAS TO 40 MILES NORTHEAST OF CORSICANA

TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...ELEVATED THUNDERSTORMS WILL CONTINUE TO INCREASE IN

COVERAGE AND INTENSITY ACROSS CENTRAL AND N TX OVER THE NEXT FEW

HOURS...AS ISENTROPIC LIFT STRENGTHENS ATOP THE LOW-LEVEL FRONTAL

SURFACE IN RESPONSE TO THE APPROACHING MID-LEVEL SHORT-WAVE TROUGH.

WITH 50 TO 60 KT MID-LEVEL WSWLYS ATOP VEERING LOW-LEVEL

FLOW...SHEAR WILL SUPPORT ROTATING/SUPERCELL STORMS.  WHILE AN

ISOLATED DAMAGING WIND GUST WILL BE POSSIBLE -- PARTICULARLY OVER

SRN PORTIONS OF THE WATCH -- GIVEN POTENTIAL FOR SOME DOWNDRAFT

ENHANCEMENT DUE TO SUB-CLOUD EVAPORATIVE COOLING...PRIMARY THREAT

WILL BE LARGE HAIL.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 24035.





...GOSS

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