ACUS11 KWNS 180153
SWOMCD
SPC MCD 180152=20
ILZ000-180315-

Mesoscale Discussion 0487
NWS Storm Prediction Center Norman OK
0852 PM CDT Fri Apr 17 2026

Areas affected...Central to east-central Illinois

Concerning...Tornado Watch 131...

Valid 180152Z - 180315Z

The severe weather threat for Tornado Watch 131 continues.

SUMMARY...A corridor of higher severe wind and QLCS tornado
potential is evident across central and east-central Illinois and
will likely persist for the next hour or two.

DISCUSSION...Radar imagery from KILX has recently been sampling
45-55 knot winds between 500-1000 ft ARL with the approach of a
bowing segment of a convective line. Additionally, several embedded circulations have been noted on the leading edge of the bow. Per
recent mesoanalysis, the regional convective environment appears
most favorable immediately downstream of the bow, and the KILX VWP
continues to show strengthening low-level winds with 0-1 km SRH
recently increasing to over 400 m2/s2 immediately ahead of the line. Consequently, confidence is high that the severe wind/QLCS tornado
threat will likely be maximized downstream into east-central IL over
the next 1-2 hours.

..Moore.. 04/18/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!-wMvbDt4rdzIdwCKnx2g-7xj5e-8EUxpsMXAwswYGyWoewNGkipYowWkgrA51kv2imKYCVtZw= mC3FUym9OI0t4-ofj8$ for graphic product...

ATTN...WFO...LOT...ILX...

LAT...LON 39858950 39978965 40178952 40348932 40478925 40668919
40888780 40748758 40478758 40208761 39988772 39838798
39858950=20

MOST PROBABLE PEAK TORNADO INTENSITY...85-115 MPH
MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN


=3D =3D =3D
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