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WWUS20 KWNS 092029

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SPC WW 092029

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 289

NWS STORM PREDICTION CENTER NORMAN OK

330 PM CDT FRI MAY 9 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL TEXAS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 330 PM UNTIL

1000 PM CDT.



HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST

SOUTHWEST OF JUNCTION TEXAS TO 60 MILES SOUTHEAST OF AUSTIN

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.



OTHER WATCH INFORMATION...CONTINUE...WW 287...WW 288...



DISCUSSION...TSTMS ARE EXPECTED TO DEVELOP ALONG A STALLED AND

WEAKLY CONVERGENT FRONTAL ZONE...AND NEAR FRONT/DRYLINE

INTERSECTION...FROM THE ESCARPMENT EWD ACROSS SCNTRL TX NEXT FEW

HOURS. THIS ACTIVITY WILL TAP VERY UNSTABLE AIR MASS ACROSS THE

REGION AND...COUPLED WITH 45-55KT EFFECTIVE BULK SHEAR...POSE A

THREAT OF VERY LARGE HAIL AND HIGH WINDS. STORMS MAY CONGEAL INTO A

SMALL MCS LATER THIS EVENING WITH WIND/HAIL POTENTIAL SPREADING

EWD/SEWD TOWARD SE TX COASTAL PLAIN.



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

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 28020.





...CARBIN

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