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000 

WWUS20 KWNS 150603

SEL5

SPC WW 150603

GAZ000-NCZ000-SCZ000-CWZ000-151300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 145

NWS STORM PREDICTION CENTER NORMAN OK

205 AM EDT SUN APR 15 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME EAST CENTRAL GEORGIA

       SOUTHERN NORTH CAROLINA

       THE SOUTH CAROLINA COASTAL PLAIN

       COASTAL WATERS



EFFECTIVE THIS SUNDAY MORNING FROM 205 AM UNTIL 900 AM EDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

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



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTHEAST OF MYRTLE

BEACH SOUTH CAROLINA TO 30 MILES NORTH NORTHWEST OF SAVANNAH

GEORGIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 144...



DISCUSSION...THUNDERSTORMS ARE INCREASING IN THE WAA REGIME OVER

SC...WHERE BOUNDARY LAYER DEWPOINTS HAVE INCREASED INTO THE UPPER

60S.  THIS MOISTURE IS RESULTING IN AT LEAST WEAK SURFACE-BASED

INSTABILITY...WHILE VERTICAL SHEAR WILL BECOME MORE FAVORABLE WITH

TIME FOR SUPERCELLS WITH TORNADOES.  EXPECT THE SUPERCELL/TORNADO

THREAT TO GRADUALLY INCREASE OVERNIGHT AND SPREAD NEWD INTO SRN NC

AS THE PRIMARY SURFACE LOW DEEPENS AND LIFTS NEWD IN THE LEE OF THE

SRN APPALACHIANS.  MEANWHILE...A SEPARATE THUNDERSTORM COMPLEX AND

APPARENT MESOLOW IN CENTRAL GA WILL CONTINUE MOVING NEWD TOWARD

SC...WITH AN ATTENDANT TORNADO THREAT IN THE REGION OF ENHANCED

SHEAR/LIFT IMMEDIATELY NE OF THE LOW.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 24040.





...THOMPSON

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