WATCHES: Severe Thunderstorm Watch Number 316

WWUS20 KWNS 302052
SEL6
SPC WW 302052
ILZ000-INZ000-KYZ000-OHZ000-WVZ000-310400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 316
NWS STORM PREDICTION CENTER NORMAN OK
450 PM EDT SAT MAY 30 2009

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

PARTS OF SOUTHERN ILLINOIS
PARTS OF SOUTHERN INDIANA
PARTS OF NORTHERN AND EASTERN KENTUCKY
PARTS OF SOUTHERN OHIO
PARTS OF WESTERN WEST VIRGINIA

EFFECTIVE THIS SATURDAY AFTERNOON FROM 450 PM UNTIL MIDNIGHT 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES SOUTHWEST
OF DECATUR ILLINOIS TO 35 MILES SOUTH SOUTHEAST OF HUNTINGTON
WEST VIRGINIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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...THUNDERSTORMS EXPECTED TO INCREASE IN NUMBER AND
INTENSITY ACROSS THE WATCH AREA AS AIR MASS CONTINUES TO DESTABILIZE
UNDER STRONG HEATING. WITH 35-45KT OF SHEAR AND MLCAPES AOA 2000
J/KG...SEVERE THUNDERSTORMS INCLUDING POSSIBLE SUPERCELLS ARE
LIKELY. PRIMARY THREAT WILL BE LARGE HAIL AND DAMAGING WINDS
PARTICULARLY WITH ANY SUPERCELL AND LINE SEGMENTS THAT DEVELOP.

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 27030.

...HALES

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