785
FZUS53 KLOT 200137
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
837 PM CDT Tue Aug 19 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>742-200930-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
837 PM CDT Tue Aug 19 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM 1 AM CDT WEDNESDAY THROUGH
LATE WEDNESDAY NIGHT...

.REST OF TONIGHT...North winds 10 to 15 kt increasing to 15 to 20
kt late. A chance of sprinkles. Waves 2 to 4 ft building to 3 to
6 ft occasionally to 8 ft.
.WEDNESDAY...Northeast winds 15 to 25 kt becoming north. A chance
of sprinkles in the morning. Waves 4 to 6 ft occasionally to 8
ft.
.WEDNESDAY NIGHT...North winds 15 to 25 kt becoming northeast 10
to 15 kt overnight. Mostly clear. Waves 4 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.

$$

LMZ743>745-200930-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
837 PM CDT Tue Aug 19 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM 1 AM CDT WEDNESDAY THROUGH
LATE WEDNESDAY NIGHT...

.REST OF TONIGHT...North winds 15 to 20 kt. A chance of
sprinkles. Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY...Northeast winds 15 to 20 kt becoming north. A chance
of sprinkles in the morning. Waves 3 to 6 ft occasionally to 8 ft.
.WEDNESDAY NIGHT...Northeast winds 15 to 20 kt diminishing to
10 to 15 kt overnight. Mostly clear. Waves 3 to 6 ft occasionally
to 8 ft.
.THURSDAY...Northeast winds 10 to 15 kt becoming north 15 to
20 kt in the afternoon. Mostly sunny. Waves 2 to 4 ft.

$$

- Izzi