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WWUS20 KWNS 051420

SEL4

SPC WW 051420

GAZ000-NCZ000-SCZ000-CWZ000-052200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 244

NWS STORM PREDICTION CENTER NORMAN OK

1020 AM EDT TUE MAY 5 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHEAST GEORGIA

       PARTS OF SOUTHEAST NORTH CAROLINA

       MUCH OF EASTERN SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1020 AM UNTIL 600

PM EDT.



HAIL TO 2 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 60

STATUTE MILES EITHER SIDE OF A LINE FROM 45 MILES SOUTHWEST OF

SAVANNAH GEORGIA TO JACKSONVILLE NORTH CAROLINA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU4).



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...WITH A MODERATELY UNSTABLE AND WEAKLY CAPPED AIR MASS

IN PLACE ACROSS THE WATCH...THUNDERSTORMS WILL INCREASE IN NUMBER

AND INTENSITY THRU THE AFTERNOON.  30-40KT OF SHEAR ASSOCIATED WITH

S/WV TROUGH PASSING BY TO THE N WILL PROVIDE SUFFICIENT SHEAR FOR

ORGANIZED CONVECTION AND POSSIBLE SUPERCELLS.  IN ADDITION TO LARGE

HAIL...DAMAGING WINDS WILL BECOME AN INCREASING

THREAT...PARTICULARLY WHERE SEA BREEZE FRONT CAN ENHANCE LOW LEVEL

CONVERGENCE THIS AFTERNOON.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 24025.





...HALES

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