Subj : MESO: Mesoscale Discussion 1987
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Mon Aug 18 2025 20:40:42

ACUS11 KWNS 182039
SWOMCD
SPC MCD 182038=20
INZ000-ILZ000-WIZ000-182215-

Mesoscale Discussion 1987
NWS Storm Prediction Center Norman OK
0338 PM CDT Mon Aug 18 2025

Areas affected...northern Illinois and southeast Wisconsin

Concerning...Severe Thunderstorm Watch 599...

Valid 182038Z - 182215Z

The severe weather threat for Severe Thunderstorm Watch 599
continues.

SUMMARY...The damaging wind threat is increasing across northeast
Illinois and southeast Wisconsin.

DISCUSSION...The earlier line of storms mostly weakened/broke apart
as it moved across southern Wisconsin and northern Illinois.
However, additional storms have started to develop along the remnant
outflow in north-central Illinois. This will likely bring a renewed
severe weather focus this afternoon, especially if storms congeal
into a eastward moving cluster. Strong instability amid upper 70s
dewpoints will provide a thermodynamic environment favorable for
damaging wind gusts. In addition, mid-level flow has started to
strengthen somewhat on the LOT VWP (~30 knots) which may aid in
storm maintenance and this more organized threat.

...Bentley.. 08/18/2025

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!93eIJSovMLFqQKl7Xns8bpAmtrp-IzdBapKyuyVq6-Zd-dwvTIqa1IktJ_RRQHue9r77X_RNE=
TzArqWxKbLsEYoKqHg$  for graphic product...

ATTN...WFO...LOT...ILX...MKX...DVN...

LAT...LON   41568968 42278893 42778847 43278785 43268726 42808701
            42218696 41758711 41358766 41128833 41118914 41218980
            41568968=20

MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH


=3D =3D =3D
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