WATCHES: Severe Thunderstorm Watch Number 287

WWUS20 KWNS 110057
SEL7
SPC WW 110057
ALZ000-LAZ000-MSZ000-110600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 287
NWS STORM PREDICTION CENTER NORMAN OK
750 PM CDT SUN MAY 10 2009

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

WEST CENTRAL AND SOUTHWEST ALABAMA
NORTHEAST LOUISIANA
SOUTHERN MISSISSIPPI

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 750 PM UNTIL
100 AM CDT.

HAIL TO 1 INCH 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTHWEST
OF NATCHEZ MISSISSIPPI TO 25 MILES SOUTH OF SELMA ALABAMA. 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.

OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 286. WATCH NUMBER 286 WILL NOT
BE IN EFFECT AFTER 750 PM CDT.

DISCUSSION...LEADING EDGE/FORWARD-PROPAGATING PART OF CONVECTIVE
SYSTEM NOW EXTENDING FROM E OF JAN S AND WSW INTO NE LA EXPECTED TO
CONTINUE E INTO AL...WHILE W-E ORIENTED PORTION SETTLES SLOWLY S
INTO SW MS. ADDITIONAL WET MICROBURSTS MAY OCCUR WITHIN
FORWARD-PROPAGATING PORTION...EWD INTO THE MEI AREA AND WRN AL. A
SMALL CHANCE WILL ALSO EXIST FOR SMALL FORWARD-PROPAGATING SEGMENTS
TO EVOLVE OVER SW MS. QUALITY OF MOISTURE INFLOW AND UVV ASSOCIATED
WITH PASSING SHORTWAVE IMPULSE TO THE N SUGGEST A CONTINUED THREAT
FOR LOCALLY DMGG WIND/MARGINALLY SVR HAIL...DESPITE ONSET OF DIURNAL
COOLING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION
VECTOR 27025.

...CORFIDI

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