WATCHES: Severe Thunderstorm Watch Number 128

WWUS20 KWNS 120301
SEL8
SPC WW 120301
GAZ000-SCZ000-121000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 128
NWS STORM PREDICTION CENTER NORMAN OK
1100 PM EDT WED APR 11 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

PARTS OF EASTERN GEORGIA
LARGE PART OF SOUTH CAROLINA

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1100 PM
UNTIL 600 AM 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 55
STATUTE MILES EITHER SIDE OF A LINE FROM 50 MILES WEST NORTHWEST
OF VIDALIA GEORGIA TO 70 MILES NORTHEAST OF COLUMBIA SOUTH
CAROLINA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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.

OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
TORNADO WATCH NUMBER 125. WATCH NUMBER 125 WILL NOT BE IN EFFECT
AFTER 1100 PM EDT. CONTINUE...WW 127...

DISCUSSION...THUNDERSTORMS EXPECTED TO INCREASE IN NUMBER AND
INTENSITY ACROSS WATCH AREA AS WARM ADVECTION INCREASES MID LEVEL
INSTABILITY AND SHEAR ABOVE SHALLOW SURFACE STABLE LAYER. STORMS
EXPECTED TO BECOME SEVERE WITH POTENTIAL FOR ELEVATED SUPERCELLS.
PRIMARY THREAT WILL BE LARGE HAIL AND LOCALIZED DAMAGING WINDS
ASSOCIATED WITH ANY LINE SEGMENTS/BOWS THAT DEVELOP.

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 450. MEAN STORM
MOTION VECTOR 24035.

..HALES

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