WATCHES: Severe Thunderstorm Watch Number 857

WWUS20 KWNS 281858
SEL7
SPC WW 281858
LAZ000-MSZ000-CWZ000-290100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 857
NWS STORM PREDICTION CENTER NORMAN OK
200 PM CDT WED SEP 28 2011

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

SOUTHEAST LOUISIANA
A SMALL PART OF SOUTHERN MISSISSIPPI
COASTAL WATERS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 200 PM UNTIL
800 PM CDT.

HAIL TO 1.5 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 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTHWEST
OF BATON ROUGE LOUISIANA TO 50 MILES EAST SOUTHEAST OF GULFPORT
MISSISSIPPI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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...THUNDERSTORMS WILL CONTINUE TO INCREASE IN
COVERAGE/INTENSITY ALONG A FRONT/OUTFLOW BOUNDARY FROM SRN MS INTO
SE LA...AND THE STORMS WILL SPREAD SEWD THROUGH THE AFTERNOON.
THOUGH VERTICAL SHEAR IS WEAK...STRONG INSTABILITY WILL PROMOTE A
RISK OF DAMAGING DOWNBURSTS AND LARGE HAIL WITH THE STRONGEST
STORMS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
MOTION VECTOR 29020.

...THOMPSON

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