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000 

WWUS20 KWNS 212025

SEL0

SPC WW 212025

NCZ000-VAZ000-CWZ000-220300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 630

NWS STORM PREDICTION CENTER NORMAN OK

425 PM EDT TUE AUG 21 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH CENTRAL AND NORTHEAST NORTH CAROLINA

       SOUTHEAST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 425 PM UNTIL

1100 PM EDT.



HAIL TO 1.5 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 55 MILES NORTHEAST OF

RICHMOND VIRGINIA TO 25 MILES SOUTH OF RALEIGH NORTH CAROLINA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 629...



DISCUSSION...ORGANIZED LINE SEGMENTS WILL CONTINUE TO SPREAD EWD

FROM CENTRAL VA/NW NC INTO SE VA AND NE NC THROUGH LATE EVENING...IN

ADVANCE OF THE REMNANTS OF TC ERIN.  A VERY DEEP MIXED

LAYER/INVERTED-V PROFILES ARE PRESENT FROM CENTRAL VA INTO CENTRAL

NC...WHILE STRONGER INSTABILITY AND RICHER BOUNDARY LAYER MOISTURE

ARE PRESENT FARTHER TO THE E.  THE NET RESULT WILL BE A FAVORABLE

ENVIRONMENT FOR MAINTAINING THE STORMS INTO THE LATE EVENING

HOURS...WITH AN ATTENDANT THREAT FOR DAMAGING WINDS AND ISOLATED

LARGE HAIL.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 27035.





...THOMPSON

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