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WWUS20 KWNS 282150

SEL9

SPC WW 282150

NCZ000-VAZ000-CWZ000-290200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 749

NWS STORM PREDICTION CENTER NORMAN OK

550 PM EDT MON SEP 28 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL NORTH CAROLINA

       SOUTHEASTERN VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 550 PM UNTIL

1000 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTHEAST OF

NORFOLK VIRGINIA TO 65 MILES WEST SOUTHWEST OF RALEIGH NORTH

CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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.



DISCUSSION...TSTMS THAT FORMED IN THE PAST 90 MIN ALONG COLD FRONT

OVER THE SRN VA/NRN NC PIEDMONT EXPECTED TO REMAIN STG/SVR FOR THE

NEXT FEW HRS AS THEY CROSS LOW LVL WARMTH/MOISTURE AXIS.  WHILE

MODEST MID LVL LAPSE RATES WILL PERSIST...FORCING/STG WIND FIELD

ASSOCIATED WITH GLANCING INFLUENCE OF GRT LKS SHORTWAVE TROUGH

SUGGEST POTENTIAL FOR SUSTAINED STORMS/SUPERCELLS WITH A THREAT FOR

LOCALLY DMGG WIND...SVR HAIL...AND POSSIBLY A BRIEF TORNADO UNTIL

AFTER SUNSET.



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 450. MEAN STORM

MOTION VECTOR 26040.





...CORFIDI

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