Nearshore Marine Forecast
Issued by NWS Chicago, IL

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FZUS53 KLOT 210224
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
924 PM 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>742-211000-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
924 PM CDT Wed Aug 20 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 AM CDT THURSDAY...

.REST OF TONIGHT...Northeast winds 15 to 25 kt becoming east and
diminishing to 10 to 15 kt. Mostly cloudy late in the evening,
then becoming partly cloudy. Waves 3 to 6 ft occasionally to 8 ft
subsiding to 3 to 5 ft late.
.THURSDAY...Northeast winds 10 to 15 kt. Mostly cloudy in the
morning then clearing. Waves 3 to 5 ft subsiding to 2 to 4 ft in
the afternoon.
.THURSDAY NIGHT...North winds 10 to 15 kt becoming northeast 5 to
10 kt. Mostly clear. Waves 1 to 3 ft.
.FRIDAY...North winds 5 to 10 kt becoming east in the afternoon.
Mostly sunny. Waves 1 to 2 ft.

$$

LMZ743>745-211000-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
924 PM CDT Wed Aug 20 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 AM CDT THURSDAY...

.REST OF TONIGHT...Northeast winds 15 to 20 kt becoming east and
diminishing to 10 to 15 kt. Mostly cloudy late in the evening
then clearing. Waves 3 to 6 ft occasionally to 8 ft subsiding to
3 to 5 ft late.
.THURSDAY...Northeast winds 10 to 15 kt becoming north in the
afternoon. Mostly cloudy in the morning then clearing. 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.
.FRIDAY...East winds 5 to 10 kt becoming northeast in the
afternoon. Sunny. Waves 1 to 2 ft.

$$

Carlaw