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WWUS20 KWNS 281757

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ALZ000-GAZ000-KYZ000-NCZ000-SCZ000-TNZ000-VAZ000-WVZ000-290100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 229

NWS STORM PREDICTION CENTER NORMAN OK

155 PM EDT FRI MAY 28 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEASTERN ALABAMA

       NORTHWESTERN GEORGIA

       SOUTHEASTERN KENTUCKY

       WESTERN NORTH CAROLINA

       WESTERN SOUTH CAROLINA

       MIDDLE AND EASTERN TENNESSEE

       SOUTHWESTERN VIRGINIA

       FAR SOUTHERN WEST VIRGINIA



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 155 PM UNTIL 900

PM EDT.



HAIL TO 1 INCH 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 120

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES WEST

NORTHWEST OF BLUEFIELD WEST VIRGINIA TO 30 MILES SOUTHEAST OF

GADSDEN ALABAMA.  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.



DISCUSSION...DESPITE WEAK SHEAR...STRONG INSTABILITY...VERY MOIST

BOUNDARY LAYER...AND PRESENCE OF UPPER LOW DROPPING SOUTHWARD

THROUGH THE TN VALLEY WILL RESULT IN NUMEROUS THUNDERSTORMS

THROUGHOUT THE AFTERNOON. ALTHOUGH THE SEVERE THREAT WILL NOT BE

LONG LIVED WITHIN INDIVIDUALS STORMS...ENVIRONMENT APPEARS FAVORABLE

FOR SCATTERED STORMS TO PRODUCE DAMAGING DOWNBURSTS.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

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

VECTOR 03010.





...IMY

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