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000 

WWUS20 KWNS 271705

SEL1

SPC WW 271705

MDZ000-NCZ000-VAZ000-CWZ000-280000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 761

NWS STORM PREDICTION CENTER NORMAN OK

105 PM EDT SUN JUL 27 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN MARYLAND

       CENTRAL AND EASTERN NORTH CAROLINA

       SOUTHERN AND EASTERN VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 105 PM UNTIL 800

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 85

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH OF

RICHMOND VIRGINIA TO 5 MILES WEST SOUTHWEST OF FAYETTEVILLE NORTH

CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 759...WW 760...



DISCUSSION...THUNDERSTORMS WILL INCREASE IN COVERAGE/INTENSITY

THROUGH THE AFTERNOON ALONG SEVERAL DIFFUSE PRE-FRONTAL BOUNDARIES

ACROSS VA/NC...AS WELL AS ALONG THE INLAND ADVANCING SEA BREEZE IN

ERN NC.  THE APPROACH A MID LEVEL TROUGH AND ASSOCIATED 30 KT MID

LEVEL FLOW WILL CONTRIBUTE TO SUFFICIENT VERTICAL SHEAR FOR

ORGANIZED MULTICELL CLUSTERS...AND PERHAPS MARGINAL SUPERCELL

STRUCTURES FARTHER N IN VA.  STEEP LAPSE RATES/STRONG INSTABILITY

WILL SUPPORT A THREAT FOR DAMAGING DOWNBURSTS AND LARGE HAIL WITH

THE STRONGER STORMS THROUGH THE AFTERNOON/EVENING.



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 29025.





...THOMPSON

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