048
ACUS11 KWNS 182039
SWOMCD
SPC MCD 182038
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 WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...LOT...ILX...MKX...DVN...
LAT...LON 41568968 42278893 42778847 43278785 43268726 42808701
42218696 41758711 41358766 41128833 41118914 41218980
41568968
MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
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