

000 

WWUS20 KWNS 262308

SEL9

SPC WW 262308

TXZ000-270600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 239

NWS STORM PREDICTION CENTER NORMAN OK

605 PM CDT SAT APR 26 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND WEST CENTRAL TEXAS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 605 PM

UNTIL 100 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 55 MILES EAST

NORTHEAST OF LUBBOCK TEXAS TO 55 MILES SOUTH OF JUNCTION TEXAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



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...THUNDERSTORMS ARE DEVELOPING ALONG A WARM FRONT ALONG

THE CORRIDOR FROM JCT TO SJT IN RESPONSE TO LOW-LEVEL CONVERGENCE

AND STRONG DAYTIME HEATING.  OTHER CONVECTION IS COALESCING OVER THE

SOUTH PLAINS IN ADVANCE OF A STRONG MID LEVEL TROUGH MOVING ESEWD

FROM NM AND NRN TX PANHANDLE.  LOW-LEVEL MOISTURE IS LIMITED ACROSS

MUCH OF W TX...BUT STEEP LAPSE RATES ARE STILL SUPPORTING SUFFICIENT

INSTABILITY FOR SEVERE STORMS.  DAMAGING WINDS SHOULD BE THE PRIMARY

SEVERE THREAT WITH THE SOUTH PLAINS CONVECTION AS IT ORGANIZES AND

SPREADS SEWD/SSEWD ALONG THE RESIDUAL WARM FRONT.  FARTHER S...THE

MORE DISCRETE STORMS SHOULD DEVELOP INTO SPLITTING SUPERCELLS

STRUCTURES WITH THE THREAT FOR LARGE HAIL AND DAMAGING WINDS.



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 500. MEAN STORM

MOTION VECTOR 31025.





...THOMPSON

