Hazardous Weather Outlook for McHenry Co., IL

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

FLUS43 KLOT 272018
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
318 PM CDT Sun Jul 27 2025


Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
318 PM CDT Sun Jul 27 2025 /418 PM EDT Sun Jul 27 2025/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Tonight.

Weather hazards expected...

Limited Thunderstorm Risk Mainly Tonight...with an associated:
Level 1 of 5 Damaging Wind Risk...up to 60 mph.
Limited Flooding Risk.
Limited Excessive Heat Risk this afternoon.

DISCUSSION...

A few storms are possible this afternoon. Brief downpours and a
few lightning strikes are the main threats. Hot and humid
conditions will continue with heat indices near 100 degrees away
from the lake.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Monday and Tuesday...
Limited Thunderstorm Risk...with an associated:
Level 1 of 5 Severe Thunderstorm Risk.
Elevated Excessive Heat Risk.
Limited Flooding Risk.
Wednesday...
Limited Thunderstorm Risk.
High Swim Risk Lake Michigan Beaches.
Elevated Flooding Risk.
Thursday...
High Swim Risk Lake Michigan Beaches.

DISCUSSION...

A thunderstorm complex may develop into the region late tonight
and early Monday morning. A few storms could produce strong to
locally damaging wind gusts.

Dangerous heat and humidity is expected area-wide on Monday. These
conditions will continue on Tuesday, but some uncertainty
regarding impacts potential morning storms remains.

Periods of thunderstorms are possible Tuesday through Wednesday.
Some of these thunderstorms could be strong to severe and may
also produce torrential rain which may lead to localized flash
flooding.

...

https://wxn.io/zwmwf