

461 

WWUS20 KWNS 190142

SEL7

SPC WW 190142

ALZ000-FLZ000-MSZ000-190700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 27

NWS STORM PREDICTION CENTER NORMAN OK

845 PM EST WED FEB 18 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN ALABAMA

       WESTERN FLORIDA PANHANDLE

       SOUTHEAST MISSISSIPPI



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 845 PM

UNTIL 200 AM EST.



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 95

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF

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...CONTINUE...WW 24...WW 25...WW 26...



DISCUSSION...THUNDERSTORMS CONTINUE TO DEVELOP ACROSS PARTS OF MS

AND SPREAD EASTWARD INTO AL.  PERSISTENT SOUTHWESTERLY LOW LEVEL

WINDS WILL MAINTAIN INFLUX OF MOISTURE AND SUFFICIENT INSTABILITY

FOR ISOLATED SEVERE/SUPERCELL STORMS.  BOUNDARY LAYER IS EXPECTED TO

DECOUPLE...WITH LARGE HAIL BEING THE MAIN THREAT THROUGH THE PERIOD.



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 27035.





...HART

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