[BNAWX] Severe Local Storm Watch and Watch Cancellation

[EMWIN Server]

WWUS20 KWNS 151655
SEL8
SPC WW 151655
ALZ000-GAZ000-MSZ000-NCZ000-TNZ000-160000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 478
NWS STORM PREDICTION CENTER NORMAN OK
1255 PM EDT WED JUN 15 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

       NORTHERN ALABAMA
       NORTHERN GEORGIA
       NORTHEAST MISSISSIPPI
       EXTREME WESTERN NORTH CAROLINA
       TENNESSEE

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1255 PM UNTIL
800 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 70
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTHWEST
OF JACKSON TENNESSEE TO 65 MILES EAST SOUTHEAST OF KNOXVILLE
TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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 BANDS OF ELEVATED STORMS WILL PERSIST IN THE WAA
REGIME FROM NE AL/MIDDLE TN EWD...WITH A RISK FOR LARGE HAIL AND
ISOLATED DAMAGING GUSTS AS THE BOUNDARY LAYER WARMS.  FARTHER
W...SURFACE HEATING IS ERODING THE CAP...AND A MIDLEVEL TROUGH
CROSSING THE MS RIVER WILL SUPPORT ADDITIONAL STORM DEVELOPMENT
THROUGH THE AFTERNOON.  THE COMBINATION OF MLCAPE AOA 3000
J/KG...INITIALLY FROM MIDDLE TN/NRN AL WWD...AND 50 KT WLY MIDLEVEL
FLOW WILL SUPPORT ORGANIZED STORM CLUSTERS CAPABLE OF PRODUCING
DAMAGING WINDS AND LARGE HAIL.  THERE WILL BE SOME POTENTIAL FOR A
MORE CONCENTRATED SWATH OF DAMAGING WINDS ACROSS MIDDLE TN AND
ADJACENT AL/GA IF ENOUGH STORM MERGERS CAN PROMOTE UPSCALE GROWTH
INTO A LARGER CLUSTER/MCS LATER THIS AFTERNOON.

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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