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WWUS20 KWNS 051747

SEL6

SPC WW 051747

GAZ000-NCZ000-SCZ000-TNZ000-VAZ000-060100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 576

NWS STORM PREDICTION CENTER NORMAN OK

145 PM EDT THU AUG 5 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME NORTHEAST GEORGIA

       WESTERN NORTH CAROLINA

       UPSTATE SOUTH CAROLINA

       MIDDLE AND EASTERN TENNESSEE

       EXTREME SOUTHWEST VIRGINIA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 145 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 80 MILES WEST

SOUTHWEST OF NASHVILLE TENNESSEE TO 45 MILES SOUTHEAST OF BRISTOL

TENNESSEE.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 574...WW 575...



DISCUSSION...SCATTERED PULSE STORMS WILL CONTINUE TO DEVELOP THROUGH

THE AFTERNOON IN THE CORRIDOR S OF A SURFACE COLD FRONT ACROSS NW

TN/KY...AS WELL AS OVER THE SRN APPALACHIANS.  THOUGH VERTICAL SHEAR

IS RELATIVELY WEAK THIS FAR SOUTH...STRONG INSTABILITY AND STEEP

LOW-LEVEL LAPSE RATES WILL SUPPORT A RISK OF DAMAGING DOWNBURST

WINDS THROUGH THE AFTERNOON.



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 550. MEAN STORM MOTION

VECTOR 29020.





...THOMPSON

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