919
ACUS11 KWNS 212124
SWOMCD
SPC MCD 212123
OHZ000-KYZ000-INZ000-ILZ000-212300-
MESOSCALE DISCUSSION 1233
NWS STORM PREDICTION CENTER NORMAN OK
0423 PM CDT SUN JUN 21 2026
AREAS AFFECTED...SOUTHERN AND CENTRAL INDIANA
CONCERNING...SEVERE POTENTIAL...WATCH NEEDED SOON
VALID 212123Z - 212300Z
PROBABILITY OF WATCH ISSUANCE...95 PERCENT
SUMMARY...THE TORNADO THREAT IS INCREASING ACROSS PORTIONS OF
SOUTHERN INDIANA AS THUNDERSTORMS WITH A HISTORY OF PRODUCING
TORNADOES ACROSS SOUTHERN ILLINOIS MOVE EAST INTO THE AREA. A
TORNADO WATCH WILL BE NEEDED SOON.
DISCUSSION...SEVERAL SUPERCELLS WITH A HISTORY OF PRODUCING
TORNADOES HAVE DEVELOPED THIS AFTERNOON ACROSS PORTIONS OF SOUTHERN
ILLINOIS IN ASSOCIATION WITH A CONVECTIVELY AUGMENTED VORTICITY
MAXIMUM MOVING EAST WITHIN ZONAL MID-LEVEL FLOW. AHEAD OF THESE
SUPERCELLS, A SURFACE BOUNDARY IS SLOWLY LIFTING NORTHWARD ACROSS
PORTIONS OF INDIANA. TO THE SOUTH OF THIS BOUNDARY, SURFACE
DEWPOINTS HAVE RISEN INTO THE 60FS TO LOW 70FS CONTRIBUTING TO
MLCAPE VALUES BETWEEN 500-1000 J/KG. ALONG THE BOUNDARY EASTERLY
LOW-LEVEL FLOW WILL MAXIMIZE STORM-RELATIVE HELICITY, AS INDICATED
BY THE INDIANAPOLIS VAD (KIND) WHICH SUGGESTS AROUND 300 M2/S2. THE
RESULT WILL BE A CONTINUED TORNADO THREAT THIS EVENING ACROSS
PORTIONS OF SOUTHERN AND CENTRAL INDIANA AND A TORNADO WATCH WILL BE
REQUIRED SOON.
..MARSH/SMITH.. 06/21/2026
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...ILN...LMK...IND...ILX...
LAT...LON 39798785 40148739 40348673 40268550 39928483 39418459
38868482 38618545 38558629 38628775 39798785
MOST PROBABLE PEAK TORNADO INTENSITY...100-125 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN
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