715
FZUS53 KLOT 200759
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
259 AM CDT Wed Aug 20 2025

For waters within five nautical miles of shore on Lake Michigan

Waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the waves, along with the
average height of the highest 10 percent of the waves which will
occasionally be encountered.

LMZ740>742-202115-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
259 AM CDT Wed Aug 20 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM 7 AM CDT THIS MORNING
THROUGH LATE TONIGHT...

.EARLY THIS MORNING...Northwest winds 10 to 15 kt. Partly cloudy.
Waves 1 to 3 ft.
.TODAY...North winds 15 to 20 kt becoming northeast this afternoon.
Increasing cloudiness. Waves 2 to 4 ft building to 3 to 6 ft
occasionally to 8 ft.
.TONIGHT...Northeast winds 20 to 25 kt. Decreasing cloudiness.
Waves 3 to 6 ft occasionally to 8 ft.
.THURSDAY...Northeast winds 10 to 15 kt. Mostly sunny. Waves 3 to
5 ft subsiding to 2 to 4 ft in the afternoon.
.THURSDAY NIGHT...Northeast winds 10 to 15 kt. Clear. Waves 1 to
3 ft.

$$

LMZ743>745-202115-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
259 AM CDT Wed Aug 20 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TODAY...North winds 20 to 25 kt. Increasing cloudiness. Waves 3
to 6 ft occasionally to 8 ft.
.TONIGHT...North winds 20 to 25 kt becoming east. Decreasing
cloudiness. Waves 3 to 6 ft occasionally to 8 ft.
.THURSDAY...Northeast winds 10 to 15 kt becoming north in the
afternoon. Mostly sunny. Waves 3 to 5 ft subsiding to 2 to 4 ft in
the afternoon.
.THURSDAY NIGHT...Northeast winds 10 to 15 kt becoming east 5 to
10 kt overnight. Clear. Waves 1 to 3 ft.

$$

Borchardt