WATCHES: Severe Thunderstorm Watch Number 439

WWUS20 KWNS 171656
SEL9
SPC WW 171656
KYZ000-NCZ000-TNZ000-VAZ000-180000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 439
NWS STORM PREDICTION CENTER NORMAN OK
1255 PM EDT WED JUN 17 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

PARTS OF EASTERN AND SOUTHERN KENTUCKY
WESTERN NORTH CAROLINA
PARTS OF MIDDLE AND EASTERN TENNESSEE
PARTS OF WESTERN VIRGINIA

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1255 PM UNTIL
800 PM EDT.

HAIL TO 2 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 110
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF
LONDON KENTUCKY TO 55 MILES SOUTH SOUTHEAST OF KNOXVILLE
TENNESSEE. 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...AIR MASS HAS BECOME MDTLY UNSTABLE WITH LITTLE
REMAINING CINH ACROSS THE WATCH AREA. THUNDERSTORMS EXPECTED TO
INCREASE IN NUMBER AND INTENSITY THRU THE AFTERNOON. WITH MLCAPES
AOA 2000 J/KG AND EFFECTIVE SHEAR OF 30-40KT...SEVERE THUNDERSTORMS
SHOULD DEVELOP. AS STORMS EVOLVE INTO CLUSTERS/SHORT
LINES...DAMAGING WINDS WILL BECOME INCREASING THREAT.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 30030.

...HALES

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