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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 801

NWS STORM PREDICTION CENTER NORMAN OK

310 AM EST WED DEC 9 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN NORTH CAROLINA

       FAR SOUTHEASTERN VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY MORNING FROM 310 AM UNTIL 800 AM EST.



TORNADOES...HAIL TO 1 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 50 STATUTE

MILES EITHER SIDE OF A LINE FROM 45 MILES SOUTH SOUTHWEST OF

WILMINGTON NORTH CAROLINA TO 40 MILES EAST NORTHEAST OF ELIZABETH

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

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 800...



DISCUSSION...SLY WINDS AT 20-25 KT HAD ADVECTED A MOISTURE BOUNDARY

LAYER... WITH DEWPOINTS INTO THE MID 60S...ACROSS THE ERN CAROLINAS

AND FAR SERN VA...AHEAD OF A STATIONARY FRONT. A WEAK UPPER WAVE

APPEARS TO HAVE AIDED THE DEVELOPMENT OF ELEVATED THUNDERSTORMS ON

THE COLD SIDE OF THE FRONT. AS THESE STORMS SHIFT EWD...THE UPDRAFTS

SHOULD BE ABLE TO TAP INTO MOIST AND UNSTABLE AIR MASS. WITH

EFFECTIVE SHEAR AT 60 KT AND LOW LEVEL SRH AROUND 500 M2/S2...

ROTATING STORMS ARE LIKELY WITH THE POTENTIAL OF A TORNADO OR TWO.



AVIATION...TORNADOES AND 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 400.

MEAN STORM MOTION VECTOR 23040.





...IMY

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