Hazardous Weather Outlook for McHenry Co., IL

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

FLUS43 KLOT 180946
HWOLOT

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
446 AM CDT Wed Jun 18 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-
446 AM CDT Wed Jun 18 2025 /546 AM EDT Wed Jun 18 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...

Significant Thunderstorm Risk...with an associated:
Level 3 of 5 Damaging Wind Risk...up to 70 mph.
Level 2 of 5 Tornado Risk.
Level 2 of 5 Large Hail Risk...up to quarter size.
Elevated Flooding Risk.

DISCUSSION...

Thunderstorms are expected today, becoming more numerous late
this morning and this afternoon. Some of these storms may be
severe, especially along and southeast of I-55 across eastern
Illinois and northwest Indiana. Damaging winds, large hail and
tornadoes are possible, in addition to locally heavy rainfall.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday and Friday...
Limited Thunderstorm Risk.
Saturday through Monday...
Limited Excessive Heat Risk.
Tuesday...
Limited Thunderstorm Risk.

DISCUSSION...

Hot and humid weather is expected to develop this weekend into
early next week. Peak afternoon heat indices at or above 100
degrees are expected.

Isolated strong storms are possible across southeast Wisconsin
Thursday afternoon and evening, and again Friday afternoon. A few
of these could clip far northeast Illinois near the Wisconsin
border, with a brief damaging wind and hail threat.

.SPOTTER INFORMATION STATEMENT...

Spotters will likely be needed this afternoon.

GENERAL STORM MOTION OF THE DAY:

Moving toward the east-northeast at 30 mph this morn...

https://wxn.io/srul9