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109 

WWUS20 KWNS 271443

SEL7

SPC WW 271443

ALZ000-ARZ000-LAZ000-MSZ000-272100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 37

NWS STORM PREDICTION CENTER NORMAN OK

845 AM CST FRI FEB 27 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHERN AND CENTRAL ALABAMA

       PARTS OF SOUTHERN ARKANSAS

       PARTS OF NORTHERN LOUISIANA

       PARTS OF NORTHERN AND CENTRAL MISSISSIPPI



EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 845 AM UNTIL 300

PM CST.



HAIL TO 2.5 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF EL

DORADO ARKANSAS TO 45 MILES SOUTH SOUTHEAST OF BIRMINGHAM

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.



DISCUSSION...THUNDERSTORMS WILL INCREASE IN NUMBER AND INTENSITY EWD

ACROSS THE WATCH AREA WHERE STEEP LAPSE RATES AND 40-50KT OF DEEP

LAYER SHEAR ARE IN PLACE.  SUPERCELLS ARE LIKELY ALONG WITH SHORT

LINE SEGMENTS/BOWS GIVEN THE ENVIRONMENT.  PRIMARY THREAT WILL BE

LARGE HAIL AND WIND DAMAGE BUT AS HEATING TAKES PLACE A TORNADO

THREAT WILL INCREASE DURING THE AFTERNOON AND PORTIONS OF THE WATCH

AREA MAY NEED TO BE UPGRADED.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 26035.





...HALES

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