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WWUS20 KWNS 220547

SEL7

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 537

NWS STORM PREDICTION CENTER NORMAN OK

1245 AM CDT WED JUN 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL AND SOUTHEAST TEXAS



EFFECTIVE THIS WEDNESDAY MORNING FROM 1245 AM UNTIL 600 AM CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 65

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

STATUTE MILES EITHER SIDE OF A LINE FROM 45 MILES NORTHEAST OF

HUNTSVILLE TEXAS TO 40 MILES WEST SOUTHWEST OF COTULLA TEXAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 534...WW 535...WW 536...



DISCUSSION...THUNDERSTORM LINE IS EXPECTED TO CONTINUE MOVING

SOUTHEASTWARD OVERNIGHT. THOUGH MID LEVEL WINDS ARE NOT PARTICULARLY

STRONG... STRONG INSTABILITY...EFFECTIVE SHEAR AT 30-40 KT AND

EVOLVING COLD POOL WILL SUPPORT STRONG GUSTY AND OCCASIONALLY SEVERE

WINDS AND SOME HAIL.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 55

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 31025.





...IMY

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