[BNAWX] Severe Local Storm Watch and Watch Cancellation

[EMWIN Server]

WWUS20 KWNS 181441
SEL9
SPC WW 181441
ALZ000-ARZ000-MOZ000-MSZ000-TNZ000-182200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 499
NWS STORM PREDICTION CENTER NORMAN OK
940 AM CDT SAT JUN 18 2011

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

       PARTS OF NORTHERN ALABAMA
       PARTS OF NORTHEASTERN ARKANSAS
       SMALL PART OF SOUTHEAST MISSOURI
       PARTS OF NORTHERN MISSISSIPPI
       MUCH OF WESTERN AND MIDDLE TENNESSEE

EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 940 AM UNTIL
500 PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH
SOUTHWEST OF JONESBORO ARKANSAS TO 65 MILES EAST NORTHEAST OF
HUNTSVILLE ALABAMA.  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...ACTIVE MCS/S CONTINUED TO MOVE ESEWD INTO TN VALLEY.
AIR MASS WILL DESTABILIZE AHEAD OF CURRENT LINE OF STORMS WITH
MLCAPES AOA 2500 J/KG AND LITTLE CINH BY EARLY AFTERNOON.  WITH
STEEP MID LEVEL LAPSE RATES COUPLED WITH 30-40KT OF BRN SHEAR...THE
DAMAGING WIND THREAT WILL INCREASE RAPIDLY INTO THE AFTERNOON AS THE
SYSTEM ADVANCES ACROSS TN VALLEY.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 28030.


...HALES


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