NWS coastal zone LMZ740

Winthrop Harbor to Wilmette Harbor IL weather alerts

Marine alerts linked to this verified National Weather Service zone.

NWS feedSource freshLast successful check: Aug 2, 2026, 3:23 AM UTC

Current answer

1 active alert

Open official zone data

Active Official severity: Minor

Small Craft Advisory for Winthrop Harbor to Wilmette Harbor IL; Wilmette Harbor to Northerly Island IL; Northerly Island to Calumet Harbor IL

Burns Harbor to Michigan City IN, Calumet Harbor IL to Gary IN, Gary to Burns Harbor IN and 3 more

Until Aug 3, 2026, 8:00 AM UTC

Official zone ID: LMZ740
Zone type: coastal
State: Marine or multi-state area
Metadata verified: Yes, from NWS

Context only

Recently ended alerts

Ended Official severity: Severe

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

Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake, Winthrop Harbor to Wilmette Harbor IL

Ended Jul 27, 2026, 9:30 PM UTC

Ended Official severity: Severe

Special Marine Warning for Winthrop Harbor to Wilmette Harbor IL; Wilmette Harbor to Northerly Island IL; Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake +1 more

Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake, Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake, Wilmette Harbor to Northerly Island IL and 1 more

Ended Jul 27, 2026, 6:45 PM UTC

Ended Official severity: Minor

Small Craft Advisory for Winthrop Harbor to Wilmette Harbor IL; Wilmette Harbor to Northerly Island IL; Northerly Island to Calumet Harbor IL +3 more

Burns Harbor to Michigan City IN, Calumet Harbor IL to Gary IN, Gary to Burns Harbor IN and 3 more

Ended Jul 29, 2026, 12:00 PM UTC

Ended Official severity: Minor

Small Craft Advisory for Calumet Harbor IL to Gary IN; Gary to Burns Harbor IN; Burns Harbor to Michigan City IN

Burns Harbor to Michigan City IN, Calumet Harbor IL to Gary IN, Gary to Burns Harbor IN and 3 more

Ended Jul 23, 2026, 2:22 AM UTC

Zone matching is not a personal forecast

This page uses official NWS zone membership. For exact location matching, an alert must include official geometry or be linked to a verified zone geometry that contains the point.

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