

746 

WWUS20 KWNS 132239

SEL8

SPC WW 132239

NCZ000-VAZ000-140400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 468

NWS STORM PREDICTION CENTER NORMAN OK

640 PM EDT TUE JUL 13 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL NORTH CAROLINA

       SOUTHEASTERN VIRGINIA



EFFECTIVE THIS TUESDAY NIGHT FROM 640 PM UNTIL MIDNIGHT 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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES NORTH

NORTHWEST OF RICHMOND VIRGINIA TO 30 MILES SOUTH SOUTHWEST OF

FAYETTEVILLE NORTH 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...CONTINUE...WW 465...WW 466...WW 467...



DISCUSSION...LARGE SCALE ASCENT WILL SPREAD EWD INTO SERN VA AND

CENTRAL NC AS UPPER WAVE APPROACHES FROM THE WEST. BAND OF STRONG TO

SEVERE STORMS WEST OF THE WW ARE EXPECTED TO BE MAINTAINED INTO THE

EVENING HOURS GIVEN THE STRENGTH OF THE INSTABILITY...MLCAPES TO

2500 J/KG. THIS INSTABILITY COMBINED WITH 30 KT OF DEEP LAYER SHEAR

AND UNIDIRECTIONAL WLY WINDS ABOVE THE BOUNDARY LAYER FAVOR DAMAGING

WINDS AS THE PRIMARY THREAT.



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 27020.





...IMY

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