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Special Marine Warning for Winthrop Harbor to Wilmette Harbor IL; Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake

Official alert fields

What you need to know

Effective
Ends or expires
Official severity
Severe
Official urgency
Immediate
Official certainty
Likely

What is happening

For the following areas... Nearshore Waters from Winthrop Harbor to Wilmette Harbor... Open Waters from Winthrop Harbor to Wilmette Harbor out to Mid Lake... At 824 PM CDT, strong thunderstorms were located along a line extending from 17 nm southeast of Wind Pt. to near Winthrop Harbor to 7 nm northeast of McHenry,...

What the bulletin says to do

Move to safe harbor until hazardous weather passes.

Read official NWS bulletin

Full official description

Bulletin details

For the following areas... Nearshore Waters from Winthrop Harbor to Wilmette Harbor... Open Waters from Winthrop Harbor to Wilmette Harbor out to Mid Lake... At 824 PM CDT, strong thunderstorms were located along a line extending from 17 nm southeast of Wind Pt. to near Winthrop Harbor to 7 nm northeast of McHenry, moving southeast at 25 knots. HAZARD...Wind gusts 34 knots or greater. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. Locations impacted include... Winthrop Harbor and Waukegan Harbor.

Official geometry where available

Alert boundary

Lifecycle record

Official revisions

3 captured
  1. Update

    Special Marine Warning issued August 18 at 8:25PM CDT until August 18 at 9:30PM CDT by NWS Chicago IL

    Official revision
  2. Update

    Special Marine Warning issued August 18 at 8:00PM CDT until August 18 at 9:30PM CDT by NWS Chicago IL

    Official revision
  3. Alert

    Special Marine Warning issued August 18 at 7:36PM CDT until August 18 at 9:30PM CDT by NWS Chicago IL

    Official revision

Source and limitations

Publisher: Weather Alert Watch. Primary source: NWS Chicago IL. This page reorganizes official fields and does not add a forecast or expand the affected area.

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