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WWUS20 KWNS 070945

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 646

NWS STORM PREDICTION CENTER NORMAN OK

440 AM CDT TUE SEP 7 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 440 AM UNTIL

100 PM CDT.



TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES EITHER SIDE OF A LINE FROM 25 MILES WEST OF CORPUS CHRISTI

TEXAS TO 45 MILES NORTH NORTHWEST OF ANGLETON TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU6).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 645. WATCH NUMBER 645 WILL NOT BE IN EFFECT AFTER

440 AM CDT.



DISCUSSION...PER LATEST NHC GUIDANCE...TROPICAL STORM HERMINE WILL

CONTINUE TO TRACK NNWWD TODAY WITH A STRONGLY SHEARED AND VERY MOIST

LOW-LEVEL ENVIRONMENT BEING MAINTAINED WITHIN THE RIGHT SEMICIRCLE

OF THE CYCLONE /RELATIVE TO ITS MOTION/.  PRIOR TO SUNRISE...THE

PRIMARY SUPERCELL/TORNADO THREAT WILL REMAIN INVOF THE COASTAL AREAS

WHERE ENVIRONMENT REMAINS SUFFICIENTLY WARM/MOIST TO SUPPORT

VIGOROUS CONVECTION.  HOWEVER...WITH THE ONSET OF DIABATIC HEATING

LATER THIS MORNING...EXPECT THE POTENTIAL FOR TORNADOES TO GRADUALLY

DEVELOP FARTHER INLAND.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 13035.





...MEAD

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