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000 

WWUS20 KWNS 051010

SEL6

SPC WW 051010

TXZ000-CWZ000-051700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 346

NWS STORM PREDICTION CENTER NORMAN OK

510 AM CDT TUE JUN 5 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL TEXAS

       COASTAL WATERS



EFFECTIVE THIS TUESDAY MORNING FROM 510 AM UNTIL NOON CDT.



HAIL TO 1.5 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 80

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST

SOUTHWEST OF HONDO TEXAS TO 45 MILES SOUTH SOUTHEAST OF VICTORIA

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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...LINEAR MCS WILL CONTINUE TO MOVE ESEWD TOWARDS THE TX

COASTAL BEND REGION THIS MORNING ALONG AN INSTABILITY GRADIENT.

EXTREMELY UNSTABLE AIR WILL CONTINUE TO FEED THIS SYSTEM WHICH MAY

ACCELERATE DURING THE MID MORNING AS DIURNAL HEATING ENHANCES COLD

POOL/DOWNDRAFTS.  ISOLATED LARGE HAIL WILL ACCOMPANY STRONGER

CORES...WITH WIND DAMAGE POTENTIAL POSSIBLY BECOMING MORE WIDESPREAD

AS IT MOVES ACROSS THE COASTAL PLAIN.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 30035.





...EVANS

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