SEL1
SPC WW 180944
ILZ000-INZ000-KYZ000-181400-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 721
NWS STORM PREDICTION CENTER NORMAN OK
535 AM EDT THU OCT 18 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHEASTERN ILLINOIS
WESTERN AND CENTRAL INDIANA
NORTHWESTERN KENTUCKY
EFFECTIVE THIS THURSDAY MORNING FROM 535 AM UNTIL 1000 AM EDT.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
MILES EITHER SIDE OF A LINE FROM 65 MILES NORTH NORTHWEST OF
DANVILLE ILLINOIS TO 10 MILES SOUTH OF LOUISVILLE KENTUCKY. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).
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 718...WW 719...WW 720...
DISCUSSION...STRONG SHORTWAVE TROUGH IS MOVING NEWD THROUGH MO INTO
IL. THIS SYSTEM IS FORCING A LINE OF STORMS EAST-NORTHEASTWARD AT 50
KT THROUGH ILLINOIS INTO INDIANA. STRONG ENVIRONMENTAL WINDS AND
THE FAST MOTION OF THE STORMS SUGGEST WIND DAMAGE IS THE MAIN
THREAT. HOWEVER...THE COMBINATION OF 1 KM SHEAR AT 40-50 KT AND
DEWPOINTS IN THE MID AND UPPER 60S INDICATE A POTENTIAL FOR ISOLATED
TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 23050.
..IMY
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