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WWUS20 KWNS 141809

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 779

NWS STORM PREDICTION CENTER NORMAN OK

210 PM EDT SUN AUG 14 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME NORTHEAST GEORGIA

       CENTRAL AND WESTERN NORTH CAROLINA

       UPSTATE SOUTH CAROLINA

       EXTREME EASTERN TENNESSEE

       SOUTHWEST VIRGINIA

       EXTREME SOUTHEAST WEST VIRGINIA



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 210 PM UNTIL 900

PM EDT.



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 95

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF

LYNCHBURG VIRGINIA TO 45 MILES SOUTHWEST OF GREENVILLE SOUTH

CAROLINA.  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...BROKEN BAND OF CONVECTION ALONG A COLD FRONT WILL

SPREAD EWD INTO AND ACROSS THE HIGH TERRAIN THIS AFTERNOON.

ADDITIONAL STORM DEVELOPMENT WILL BE SUPPORTED BY FURTHER SURFACE

HEATING NEAR AND E OF THE MOUNTAINS...AND AS A MIDLEVEL TROUGH

ROTATES ESEWD OVER THIS AREA.  THE COMBINATION OF MODERATE

INSTABILITY AND SOME INCREASE IN WLY MIDLEVEL FLOW WILL SUPPORT A

RISK OF DAMAGING WINDS AND MARGINALLY SEVERE HAIL THROUGH THIS

EVENING.



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 28030.





...THOMPSON

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