TORNADO WATCH NUMBER 623
NWS STORM PREDICTION CENTER NORMAN OK
330 PM CDT TUE JUL 13 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL ILLINOIS
CENTRAL AND SOUTHERN INDIANA
EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 330 PM UNTIL
1000 PM CDT.
TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 70 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 5 MILES WEST NORTHWEST OF SPRINGFIELD
ILLINOIS TO 45 MILES EAST SOUTHEAST OF INDIANAPOLIS INDIANA.
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 619...WW 620...WW 621...WW
622...
DISCUSSION...INTENSE TORNADIC SUPERCELLS CENTRAL IL WILL CONTINUE TO
FEED ON THE EXTREMELY UNSTABLE AIR MASS FEEDING IN FROM THE W. WITH
THE APPROACH OF THE 50-60 KT MID LEVEL WIND MAX...SHEAR WILL BECOME
INCREASINGLY FAVORABLE FOR TORNADIC STORMS WHICH WILL INCLUDE VERY
LARGE HAIL AND DAMAGING WINDS
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 650.
MEAN STORM MOTION VECTOR 32030.
