736
WWUS9 KMKC 162014
SEL6
MKC WW 162006
ILZ000-INZ000-170100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 236
STORM PREDICTION CENTER NORMAN OK
306 PM CDT WED MAY 16 2001

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

CENTRAL AND EASTERN ILLINOIS
WESTERN AND CENTRAL INDIANA

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 315 PM UNTIL
800 PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 80 STATUTE MILES
EAST AND WEST OF A LINE FROM 55 MILES NORTH OF DANVILLE ILLINOIS TO
45 MILES SOUTH SOUTHWEST OF BLOOMINGTON INDIANA.

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.

OTHER WATCH INFORMATION...  CONTINUE...WW 235...

DISCUSSION...THUNDERSTORMS EXPECTED TO BACKBUILD GENERALLY WWD OR
NWWD FROM LOW LEVEL CONVERGENCE MAX OVER W CNTRL IND.  THE
CONVERGENCE MAX APPEARS TO BE AT INTERSECTION OF OUTFLOW BOUNDARY
FROM EARLIER CONVECTION AND WEAK W/E COLD FRONT DRIFTING SLOWLY S
FROM NE IL.  CONTINUED SURFACE HEATING SHOULD LEAD TO AN INCREASE
IN COVERAGE/INTENSITY...WITH STRONG INSTABILITY /SBCAPE TO 3000
J/KG/ AND MODEST DEEP LAYER SHEAR /25-30 KTS/ FAVORING LARGE
HAIL/LOCALLY DAMAGING WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 31025.

...CORFIDI

;383,0882 405,0890 405,0860 383,0852;