

000 

WWUS20 KWNS 112047

SEL9

SPC WW 112047

NCZ000-SCZ000-VAZ000-CWZ000-120300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 309

NWS STORM PREDICTION CENTER NORMAN OK

445 PM EDT SUN MAY 11 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN NORTH CAROLINA

       EXTREME NORTHEAST SOUTH CAROLINA

       SOUTHEAST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 445 PM UNTIL

1100 PM EDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 65 MILES NORTHEAST OF

ELIZABETH CITY NORTH CAROLINA TO 20 MILES SOUTH OF WILMINGTON

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 307...WW 308...



DISCUSSION...SECONDARY CYCLOGENESIS IS UNDERWAY ALONG PIEDMONT FRONT

AHEAD OF POWERFUL DEEP-LAYER CYCLONE SPINNING ACROSS OH ATTM. AIR

MASS AHEAD OF THE DEVELOPING LOW HAS BEEN MOISTENING BUT RELATIVELY

SLOW TO DESTABILIZE DUE TO EXTENSIVE CLOUD COVER NOW DEPARTING PARTS

OF ERN NC. FORCING WITH THE SECONDARY LOW AND LATER WITH ADVANCING

COLD FRONT SHOULD BE SUFFICIENT FOR STRONG TO SEVERE STORMS TO

SPREAD EAST ACROSS PARTS OF THE COASTAL PLAIN/TIDEWATER AND OUTER

BANKS AREAS THROUGH LATER THIS EVENING. INTENSE DEEP-LAYER

TROPOSPHERIC WIND FIELDS /100KT AT 500MB/...MAGNITUDE OF LARGE SCALE

FORCING...AND PRONOUNCED MID LEVEL DRY INTRUSION...SHOULD ALL

SUPPORT DAMAGING STRAIGHT-LINE WIND POTENTIAL...AS WELL AS BRIEF

TORNADOES.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24035.





...CARBIN

