Tornado Watch 306

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