617
WHUS73 KLOT 210232
MWWLOT

URGENT - MARINE WEATHER MESSAGE
National Weather Service Chicago IL
932 PM CDT Sun Sep 20 2026

LMZ740>742-211045-
/O.CON.KLOT.SC.Y.0083.000000T0000Z-260924T0000Z/
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
932 PM CDT Sun Sep 20 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT
WEDNESDAY...

* WHAT...Northeast winds to 30 kt and significant waves to 9 ft
  occasionally to 12 ft.

* WHERE...Winthrop Harbor to Calumet Harbor, IL.

* WHEN...Until 7 PM CDT Wednesday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

LMZ743-744-211045-
/O.CON.KLOT.SC.Y.0083.000000T0000Z-260923T1500Z/
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
932 PM CDT Sun Sep 20 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 AM CDT
WEDNESDAY...

* WHAT...Northeast winds to 30 kt and significant waves to 8 ft
  occasionally to 10 ft.

* WHERE...Calumet Harbor, IL to Burns Harbor, IN.

* WHEN...Until 10 AM CDT Wednesday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

LMZ745-211045-
/O.CON.KLOT.SC.Y.0083.000000T0000Z-260921T1200Z/
Burns Harbor to Michigan City IN-
932 PM CDT Sun Sep 20 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 7 AM CDT MONDAY...

* WHAT...Northeast winds to 25 kt and significant waves to 6 ft
  occasionally to 8 ft.

* WHERE...Burns Harbor to Michigan City, IN.

* WHEN...Until 7 AM CDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$