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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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