WATCHES: Severe Thunderstorm Watch Number 146

WWUS20 KWNS 051748
SEL6
SPC WW 051748
GAZ000-NCZ000-SCZ000-CWZ000-060100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 146
NWS STORM PREDICTION CENTER NORMAN OK
150 PM EDT THU APR 5 2012

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

EASTERN GEORGIA
WESTERN NORTH CAROLINA
SOUTH CAROLINA
COASTAL WATERS

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 150 PM UNTIL
900 PM 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 60
STATUTE MILES EITHER SIDE OF A LINE FROM 25 MILES WEST OF
ASHEVILLE NORTH CAROLINA TO 30 MILES SOUTH OF CHARLESTON SOUTH
CAROLINA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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...CONTINUE...WW 143...WW 144...WW 145...

DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY ACROSS THE WATCH AREA THIS AFTERNOON ALONG AND AHEAD OF
COLD FRONT ADVANCING SWD/SWWD ACROSS THE REGION. RUC OBJECTIVE
ANALYSIS SUGGESTS THAT PRE-FRONTAL AIR MASS HAS BECOME MODERATELY
UNSTABLE WITH MLCAPE OF 1500-2500 J/KG OWING TO STRONG DAYTIME
HEATING AND DEWPOINTS IN THE 60S. WHEN COUPLED WITH 30-40 KT OF
DEEP-LAYER SHEAR...SETUP WILL SUPPORT MULTICELL AND MARGINAL
SUPERCELL STRUCTURES WITH AN ASSOCIATED THREAT FOR DAMAGING WINDS
AND LARGE HAIL.

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 500. MEAN STORM
MOTION VECTOR 27020.

...MEAD

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