NWS Chicago ILMA.W 0078September 4, 2026
Special Marine Warning: Winthrop Harbor to Wilmette Harbor IL and Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake
The National Weather Service office in Chicago issued a special marine warning for Winthrop Harbor to Wilmette Harbor IL and Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake, which was in force until 12:00 a.m. local time on September 5. It was the 78th special marine warning the NWS office in Chicago issued in 2026.
ExpiredWarning
In force for 1.6 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Chicago IL
- Area
- Winthrop Harbor to Wilmette Harbor IL and Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake
- Level
- Warning
- Issued
- 10:26 p.m. CDT, September 4, 2026
- Expires
- 12:00 a.m. CDT, September 5, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Immediate
- VTEC event
- KLOT MA.W 0078
- Official source
- National Weather Service: the notice at its source
NWS notices, September 2026The latest from the National Weather Service
Source: National Weather Service: the notice at its source. AreaZine rebuilds this page from the agency's record; the agency's page is the one to act on. A U.S. Government work, in the public domain.
The notice as issued
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 midnight CDT. * At 1026 PM CDT, a severe thunderstorm was located near Waukegan Harbor, moving east at 20 knots. HAZARD...Wind gusts to 40 knots 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. * Locations impacted include... Winthrop Harbor and Waukegan Harbor.
What the agency told people to do
Move to safe harbor immediately as gusty winds and high waves are expected.
Source: National Weather Service: the notice at its source. The text is the agency's, unedited. A U.S. Government work, in the public domain.