

000 

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

