

300 

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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