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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 441

NWS STORM PREDICTION CENTER NORMAN OK

945 AM EDT SUN JUL 1 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME NORTHWEST NORTH CAROLINA

       EXTREME NORTHEAST TENNESSEE

       SOUTHWEST VIRGINIA

       EXTREME SOUTHERN WEST VIRGINIA



EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 945 AM UNTIL 300

PM EDT.



HAIL TO 2 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 40

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTH OF

BRISTOL TENNESSEE TO 50 MILES SOUTHEAST OF ROANOKE VIRGINIA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...A CLUSTER OF ELEVATED THUNDERSTORMS THIS MORNING WILL

CONTINUE TO MOVE ESEWD TOWARD SW VA WITH AN ATTENDANT RISK FOR LARGE

HAIL.  THESE STORMS ARE EMBEDDED IN A BELT OF 35-45 KT MIDLEVEL

FLOW...WITH VERY STEEP MIDLEVEL LAPSE RATES OBSERVED IN 12Z

SOUNDINGS.  ONCE THE BOUNDARY LAYER WARMS INTO THE 90S ACROSS SW

VA/NW NC...CONVECTION WILL LIKELY BECOME SURFACE-BASED WITH THE

POTENTIAL FOR SOME UPSCALE GROWTH AND AN INCREASE IN DAMAGING WIND

POTENTIAL.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 29035.





...THOMPSON

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