Weather Alert WatchOfficial-source alert index
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Ended official alertUpdated

Special Marine Warning for Wilmette Harbor to Northerly Island IL; Northerly Island to Calumet Harbor IL; Calumet Harbor IL to Gary IN +3 more

This alert has ended.Kept for recent context. Do not use it as a current warning.

Official alert fields

What you need to know

Effective
Ended
Official severity
Severe
Official urgency
Immediate
Official certainty
Likely

What is happening

The affected areas were... Nearshore Waters from Wilmette Harbor to Calumet Harbor... Nearshore Waters from Calumet Harbor to Michigan City... Open Waters from Wilmette Harbor to Michigan City out to Mid Lake... The thunderstorms have weakened and no longer pose a significant threat to boaters. A Severe...

What the bulletin says to do

No separate action instruction was included in this NWS record. Read the complete official bulletin and follow local authorities.

Read official NWS bulletin

Full official description

Bulletin details

The affected areas were... Nearshore Waters from Wilmette Harbor to Calumet Harbor... Nearshore Waters from Calumet Harbor to Michigan City... Open Waters from Wilmette Harbor to Michigan City out to Mid Lake... The thunderstorms have weakened and no longer pose a significant threat to boaters. A Severe Thunderstorm Watch remains in effect until 400 AM CDT for northeastern Illinois...northwestern Indiana...and the adjacent waters of Lake Michigan.

Lifecycle record

Official revisions

2 captured
  1. Update

    Special Marine Warning issued August 10 at 1:24AM CDT until August 10 at 1:30AM CDT by NWS Chicago IL

    Official revision
  2. Alert

    Special Marine Warning issued August 9 at 11:54PM CDT until August 10 at 1:30AM 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.

CAP status
Actual
Message type
Update
Last collected
Methodology and corrections