Nearshore Marine Forecast
Issued by NWS Chicago, IL

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591
FZUS53 KLOT 300248
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
948 PM CDT Tue Jul 29 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>742-301200-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
948 PM CDT Tue Jul 29 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH FRIDAY MORNING...

.REST OF TONIGHT...Northeast winds 5 to 10 kt becoming north and
increasing to 10 to 15 kt. Increasing cloudiness. Waves around 1
ft building to 1 to 2 ft.
.WEDNESDAY...Northeast winds 10 to 15 kt increasing to 15 to 25
kt in the afternoon. Chance of showers and thunderstorms in the
morning, then showers likely and a chance of thunderstorms in the
afternoon. Waves 2 to 4 ft building to 4 to 6 ft occasionally to
8 ft in the afternoon.
.WEDNESDAY NIGHT...Northeast winds to 30 kt. Occasional gale
gusts to 35 kt possible. Showers likely and a chance of
thunderstorms. Waves 5 to 8 ft occasionally to 10 ft.
.THURSDAY...Northeast winds 15 to 25 kt. Slight chance of showers
and thunderstorms in the morning. Waves 4 to 7 ft occasionally to
9 ft.

$$

LMZ743>745-301200-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
948 PM CDT Tue Jul 29 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH FRIDAY MORNING...

.REST OF TONIGHT...North winds around 5 kt becoming northeast.
Increasing cloudiness. Waves around 1 ft.
.WEDNESDAY...Northeast winds 10 to 15 kt increasing to 15 to 25
kt in the afternoon. Chance of showers and thunderstorms in the
morning, then showers likely and a chance of thunderstorms in the
afternoon. Waves 1 to 3 ft building to 3 to 6 ft occasionally to
8 ft in the afternoon.
.WEDNESDAY NIGHT...Northeast winds to 30 kt becoming east.
Showers and a chance of thunderstorms. Waves 4 to 7 ft
occasionally to 9 ft.
.THURSDAY...Northeast winds 15 to 25 kt. Chance of showers and
slight chance of thunderstorms in the morning. Waves 4 to 6 ft
occasionally to 8 ft.

$$
DK