Severe · Special Marine WarningThis alert has expired. It is kept for reference.
Special Marine Warning issued September 4 at 11:12PM 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, 5:30 AM
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake
Likely impact; effects through 5:30 AM.
Move to safe harbor until hazardous weather passes. Frequent lightning is occurring with these storms. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects.
Read the original bulletin (official text)
SMWLOT The National Weather Service in Chicago has issued a * Special Marine Warning for... Open Waters from Winthrop Harbor to Wilmette Harbor out to Mid Lake... * Until 1230 AM CDT. * At 1112 PM CDT, strong thunderstorms were located along a line extending from 26 nm northwest of St. Joseph Light to 11 nm east of Waukegan Harbor, moving east at 25 knots. HAZARD...Wind gusts to 40 knots and small hail. SOURCE...Radar. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. * Strong thunderstorms will remain over mainly open waters.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™