

000 

WWUS20 KWNS 270434 CCA

SEL0

SPC WW 270434 CCA

TXZ000-271000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 240...CORRECTED

NWS STORM PREDICTION CENTER NORMAN OK

1140 PM CDT SAT APR 26 2008



CORRECTED FOR REPLACEMENT OF WW 239



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL TEXAS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1140 PM

UNTIL 500 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 10 MILES EAST

NORTHEAST OF ABILENE TEXAS TO 40 MILES WEST OF NEW BRAUNFELS

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 239. WATCH NUMBER 239 WILL NOT

BE IN EFFECT AFTER 1140 PM CDT.



DISCUSSION...SCATTERED SUPERCELLS WILL LIKELY PERSIST FOR SEVERAL

MORE HOURS WHILE THE CONVECTION DEVELOPS SEWD ACROSS CENTRAL TX IN

ADVANCE OF A SURFACE COLD FRONT AND MID LEVEL TROUGH APPROACHING

FROM THE NW.  A GRADUAL INCREASE IN BOUNDARY LAYER MOISTURE FROM THE

SE SHOULD SOMEWHAT OFFSET NOCTURNAL COOLING AND MAINTAIN SUFFICIENT

INSTABILITY FOR LARGE HAIL AND DAMAGING WINDS.  THERE WILL ALSO BE

SOME POTENTIAL FOR MORE LINEAR CONVECTION TO EVOLVE ALONG THE COLD

FRONT...AND FROM EVENTUAL STORM MERGERS.



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 32025.





...THOMPSON

