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771 

WWUS20 KWNS 281649

SEL0

SPC WW 281649

GAZ000-SCZ000-CWZ000-290000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 90

NWS STORM PREDICTION CENTER NORMAN OK

1250 PM EDT SAT MAR 28 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST GEORGIA

       CENTRAL AND COASTAL SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL

800 PM 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 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHWEST OF

CHARLESTON SOUTH CAROLINA TO 30 MILES EAST SOUTHEAST OF VALDOSTA

GEORGIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 89...



DISCUSSION...A LARGE CONVECTIVE CLUSTER WITH AN EMBEDDED MCV WILL

LIKELY PERSIST THROUGH THE AFTERNOON WHILE MOVING NEWD FROM GA INTO

SC.  INSTABILITY IS NOT PARTICULARLY STRONG E OF THE ONGOING

STORMS...BUT SOME MOISTENING AND CONTINUED SURFACE HEATING SHOULD

RESULT IN SUFFICIENT DESTABILIZATION TO MAINTAIN THE CLUSTER.  GIVEN

THE ORGANIZED BOWING SEGMENTS AND MODERATELY STRONG VERTICAL

SHEAR...A COUPLE OF TORNADOES WILL BE POSSIBLE IN ADDITION TO

DAMAGING WINDS.



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 500.

MEAN STORM MOTION VECTOR 24035.





...THOMPSON

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