WATCHES: Tornado Watch Number 145

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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