Hazardous Weather Outlook for McHenry Co., IL

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

FLUS43 KLOT 270950
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
450 AM 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-
450 AM CDT Sun Jul 27 2025 /550 AM EDT Sun Jul 27 2025/

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

.DAY ONE...Today and Tonight.

Weather hazards expected...

Limited Thunderstorm Risk Tonight...with an associated:
Level 1 of 5 Damaging Wind Risk...up to 60 mph.
Limited Excessive Heat Risk.
Limited Fog Risk early in the morning.

DISCUSSION...

Scattered showers and thunderstorms will persist along and south
of I-80 through the morning. There is another chance for
thunderstorms late tonight into Monday morning mainly west of the
Fox Valley. Storms tonight could be strong to severe with damaging
winds up to 60 mph.

Warm and humid conditions are expected today which will result in
afternoon heat indices between 95 and 100 degrees.

Patchy fog, some locally dense, will persist through 8 AM this
morning.

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

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

DISCUSSION...

Dangerous heat and humidity is possible Monday and maybe again on
Tuesday.

There is a chance of thunderstorms Monday morning. Some of these
storms could be strong to severe especially across nor...

https://wxn.io/tnj9j