Severe · Special Marine WarningThis alert has expired. It is kept for reference.
Special Marine Warning issued September 3 at 11:19AM CDT until September 3
Affecting Winthrop Harbor to Wilmette Harbor IL; Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake
In effect until: Sep 3, 2026, 5:45 PM
Winthrop Harbor to Wilmette Harbor IL; Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake
Likely impact; effects through 5:45 PM.
Move to safe harbor until hazardous weather passes.
Read the original bulletin (official text)
SMWLOT The National Weather Service in Chicago has issued a * Special Marine Warning for... Nearshore Waters from Winthrop Harbor to Wilmette Harbor... Open Waters from Winthrop Harbor to Wilmette Harbor out to Mid Lake... * Until 1245 PM CDT. * At 1119 AM CDT, a severe thunderstorm was located near Wilmette Harbor, moving east at 20 knots. HAZARD...Wind gusts 34 knots or greater and large hail. SOURCE...Radar. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Large hail could result in structural damage. * The severe thunderstorm will remain over mainly open waters.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™