[BNAWX] Severe Local Storm Watch and Watch Cancellation

[EMWIN Server]

WWUS20 KWNS 011345
SEL1
SPC WW 011345
NCZ000-TNZ000-VAZ000-WVZ000-011900-

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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