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107 

WWUS20 KWNS 271358

SEL8

SPC WW 271358

ALZ000-GAZ000-SCZ000-CWZ000-272100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 68

NWS STORM PREDICTION CENTER NORMAN OK

955 AM EDT SUN MAR 27 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHERN ALABAMA

       LARGE PART OF SOUTHERN AND CENTRAL GEORGIA

       PARTS OF SOUTHERN SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 955 AM UNTIL 500

PM EDT.



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 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 65 MILES SOUTHEAST

OF CHARLESTON SOUTH CAROLINA TO 15 MILES SOUTH SOUTHWEST OF SELMA

ALABAMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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...ACTIVE THUNDERSTORMS CURRENTLY ALONG AND JUST N OF

FRONTAL BOUNDARY THAT EXTENDS FROM CENTRAL GA TO SWRN AL. AIR MASS

TO S OF FRONT HAS BECOME VERY MOIST AND WITH JUST A FEW DEGREES OF

HEATING WILL BECOME UNCAPPED AND MDTLY UNSTABLE. WITH 40-50KT OF

SHEAR COUPLED WITH STEEP MID LEVEL LAPSE RATES...LARGE HAIL WILL

BECOME AN INCREASING THREAT AS STORMS DEVELOP S AND E THRU THE

WATCH. IN ADDITION CONDITIONS ARE FAVORABLE FOR SUPERCELLS WHICH

WILL ENHANCE HAIL THREAT AND THE POSSIBILITY OF ISOLATED TORNADOES

BY MID AFTERNOON.



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 500. MEAN STORM

MOTION VECTOR 27030.





...HALES

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