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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 252

NWS STORM PREDICTION CENTER NORMAN OK

850 AM EDT THU APR 28 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST GEORGIA

       EASTERN NORTH CAROLINA

       EASTERN SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 850 AM UNTIL

400 PM EDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 15 MILES SOUTH OF SAVANNAH

GEORGIA TO 75 MILES NORTHEAST OF NEW BERN NORTH CAROLINA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU2).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 249...WW 250...WW 251...



DISCUSSION...BROKEN BAND OF PRE-FRONTAL CONVECTION WILL PERSIST FOR

THE NEXT FEW HOURS...WITH ADDITIONAL DEVELOPMENT POSSIBLE CLOSER TO

THE COAST AS DAYTIME HEATING PROCEEDS.  THE ENVIRONMENT IS EXPECTED

TO REMAIN MODERATELY UNSTABLE /MLCAPE AOA 1500 J PER KG/...WITH

SUFFICIENT VERTICAL SHEAR TO MAINTAIN A THREAT FOR DAMAGING

WINDS/LARGE HAIL...AS WELL AS A COUPLE OF TORNADOES WITH EMBEDDED

SUPERCELLS/BOWS.



AVIATION...TORNADOES AND 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 24035.





...THOMPSON

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