Severe · Special Marine WarningThis alert has expired. It is kept for reference.
Special Marine Warning issued September 4 at 11:16PM CDT until September 5
Affecting Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake; Lake Michigan from Wilmette Harbor to Michigan City in 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; Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake
Likely impact; effects through 5:00 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)
For the following areas... Open Waters from Winthrop Harbor to Michigan City out to Mid Lake... At 1116 PM CDT, strong thunderstorms were located along a line extending from 23 nm west of St. Joseph Light to 18 nm northeast of Harrison-Dever Crib, moving east at 30 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. Strong thunderstorms will remain over mainly open waters.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™