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487 

WWUS20 KWNS 050435

SEL9

SPC WW 050435

NCZ000-VAZ000-051000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 99

NWS STORM PREDICTION CENTER NORMAN OK

1235 AM EDT TUE APR 5 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWESTERN NORTH CAROLINA

       SOUTHWEST AND SOUTH CENTRAL VIRGINIA



EFFECTIVE THIS TUESDAY MORNING FROM 1235 AM UNTIL 600 AM 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 55

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTHWEST OF

LYNCHBURG VIRGINIA TO 60 MILES SOUTH OF DUBLIN VIRGINIA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU9).



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 96...WW 97...WW 98...



DISCUSSION...NRN FRINGES OF A QLCS HAS INCREASED IN INTENSITY ALONG

THE BLUE RIDGE MOUNTAINS AS BOUNDARY LAYER MOISTURE SURGES TO THE

NORTH.  AS LOW-LEVEL FLOW CONTINUES TO INCREASE IN CONJUNCTION WITH

THE ENHANCED BUOYANCY...THE SQUALL LINE SHOULD BE

MAINTAINED/INCREASE THROUGH EARLY MORNING TUESDAY.  DAMAGING WINDS

WILL BE THE PRIMARY SEVERE 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 450. MEAN STORM MOTION

VECTOR 26045.





...RACY

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