Severe · Special Marine WarningThis alert has expired. It is kept for reference.

Special Marine Warning issued September 4 at 11:14PM CDT until September 5

Affecting Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake

In effect until: Sep 5, 2026, 5:00 AM

Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake

Likely impact; effects through 5:00 AM.

Move to safe harbor until hazardous weather passes.

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For the following areas...

Open Waters from Winthrop Harbor to Wilmette Harbor out to Mid
Lake...

At 1113 PM CDT, a strong thunderstorm was located 14 nm east of
Waukegan Harbor, moving east at 20 knots.

HAZARD...Wind gusts to 40 knots and small hail.

SOURCE...Radar indicated.

IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.

The strong thunderstorm will remain over mainly open waters.

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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™

Special Marine Warning issued September 4 at 11:14PM CDT until September 5

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