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056 

WWUS20 KWNS 300140

SEL7

SPC WW 300140

NCZ000-SCZ000-VAZ000-CWZ000-301100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 687

NWS STORM PREDICTION CENTER NORMAN OK

940 PM EDT WED SEP 29 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN NORTH CAROLINA

       EASTERN SOUTH CAROLINA

       FAR SOUTHEAST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 940 PM

UNTIL 700 AM EDT.



TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 40 STATUTE

MILES EITHER SIDE OF A LINE FROM 15 MILES SOUTH SOUTHEAST OF

CHARLESTON SOUTH CAROLINA TO 20 MILES EAST NORTHEAST OF ELIZABETH

CITY NORTH CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



DISCUSSION...COASTAL FRONT SHOULD CONTINUE TO PIVOT WWD OVERNIGHT IN

ADVANCE OF DEEPENING SURFACE LOW DEVELOPING NNWWD INTO THE

CAROLINAS.  AMBIENT AIR MASS ALONG AND TO THE E OF THE COASTAL

BOUNDARY IS MOIST...MARGINALLY UNSTABLE AND STRONGLY SHEARED.  AS

SUCH...SETUP WILL BE SUPPORTIVE OF EMBEDDED SUPERCELL STRUCTURES

CAPABLE OF A COUPLE TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 16030.





...MEAD

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