

000 

WWUS20 KWNS 111357

SEL6

SPC WW 111357

KYZ000-NCZ000-OHZ000-TNZ000-VAZ000-WVZ000-111900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 306

NWS STORM PREDICTION CENTER NORMAN OK

955 AM EDT SUN MAY 11 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN KENTUCKY

       WESTERN NORTH CAROLINA

       SOUTHERN OHIO

       EASTERN TENNESSEE

       SOUTHWEST VIRGINIA

       SOUTHWEST AND CENTRAL WEST VIRGINIA



EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 955 AM UNTIL 300

PM EDT.



TORNADOES...HAIL TO 1.5 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 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF CHARLESTON

WEST VIRGINIA TO 55 MILES SOUTH OF KNOXVILLE TENNESSEE.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU6).



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 304...WW 305...



DISCUSSION...INTENSE CYCLONE OVER THE MIDWEST WAS DRIVING

PRE-FRONTAL SQUALL LINE RAPIDLY EAST TOWARD THE CNTRL APPALACHIANS

THIS MORNING. GENERALLY WEAK INSTABILITY WILL BE ENHANCED SOMEWHAT

BY ONGOING SURFACE HEATING AHEAD OF THE LINE.

FURTHERMORE...MAGNITUDE OF FORCING AND SHEAR...WITH OVER 100KT JET

MAX AT 500MB...WILL SUPPORT NOT ONLY STORM PERSISTENCE BUT THE RAPID

EWD TRANSLATION OF THE BROKEN CONVECTIVE LINE. STRONGER MID LEVEL

WINDS MAY MORE READILY MIX DOWN ACROSS THE HIGHER TERRAIN AS

CONVECTION MOVES THROUGH. HIGH LOW LEVEL SHEAR ALSO SUPPORTS BRIEF

TORNADO EVENTS WITH QUASI-DISCRETE CELLS WITHIN THE LINE.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

400. MEAN STORM MOTION VECTOR 24045.





...CARBIN

