WATCHES: Tornado Watch Number 687

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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