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578 

WWUS20 KWNS 131816

SEL6

SPC WW 131816

GAZ000-NCZ000-SCZ000-VAZ000-140200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 466

NWS STORM PREDICTION CENTER NORMAN OK

215 PM EDT TUE JUL 13 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR NORTHEAST GEORGIA

       WESTERN AND PART OF CENTRAL NORTH CAROLINA

       NORTHWEST SOUTH CAROLINA

       PART OF SOUTHWEST VIRGINIA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 215 PM UNTIL

1000 PM EDT.



HAIL TO 1 INCH 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 20 MILES SOUTHWEST OF

ANDERSON SOUTH CAROLINA TO 30 MILES NORTHEAST OF GREENSBORO NORTH

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 464...WW 465...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY ACROSS THE AREA IN ADVANCE OF MIDLEVEL TROUGH APPROACHING

FROM THE WEST.  AMBIENT AIR MASS HAS EXPERIENCED STRONG DAYTIME

HEATING...AND WHEN COUPLED WITH THE MOIST BOUNDARY

LAYER...ENVIRONMENT IS MODERATELY UNSTABLE WITH MLCAPE OF 1000-2000

J/KG.  EXPECT MID AND HIGH-LEVEL WIND FIELD TO STEADILY STRENGTHEN

THROUGH THE REMAINDER OF THE DIURNAL HEATING CYCLE WITH VERTICAL

SHEAR BECOMING SUPPORTIVE OF ORGANIZED MULTICELL CLUSTERS AND LINE

SEGMENTS.  DAMAGING WIND GUSTS WILL BE THE PRIMARY HAZARD.



AVIATION...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 500. MEAN STORM MOTION

VECTOR 26030.





...MEAD

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