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WWUS20 KWNS 031210

SEL9

SPC WW 031210

ALZ000-FLZ000-CWZ000-031800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 259

NWS STORM PREDICTION CENTER NORMAN OK

710 AM CDT SAT MAY 3 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN ALABAMA

       THE WESTERN FLORIDA PANHANDLE

       COASTAL WATERS



EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 710 AM UNTIL

100 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 80

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST OF

MOBILE ALABAMA TO 35 MILES SOUTH OF MONTGOMERY 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.



OTHER WATCH INFORMATION...CONTINUE...WW 258...



DISCUSSION...A WELL-DEVELOPED PRE-FRONTAL SQUALL LINE WILL CONTINUE

MOVING ESEWD THROUGH THE MORNING ACROSS CENTRAL/SRN AL.  AS THE LOW

LEVELS DESTABILIZE WITH DAYTIME HEATING...THE THREAT FOR DAMAGING

WINDS AND LARGE HAIL WILL BE MAINTAINED WITH THE STRONGEST STORMS IN

THE LINE.  THE CONVECTIVE MODE SHOULD REMAIN PRIMARILY LINEAR GIVEN

THE TENDENCY FOR LOW-LEVEL AND DEEP LAYER SHEAR TO WEAKEN GRADUALLY

BY EARLY AFTERNOON.



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 500. MEAN STORM

MOTION VECTOR 28030.





...THOMPSON

