940
FZUS53 KLOT 180237
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
937 PM CDT Thu Sep 17 2026

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.

LMZ740-180915-
Winthrop Harbor to Wilmette Harbor IL-
937 PM CDT Thu Sep 17 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 7 AM CDT FRIDAY THROUGH
FRIDAY AFTERNOON...

.REST OF TONIGHT...Northeast winds 10 to 15 kt. Patchy fog late
in the evening. Waves 2 to 4 ft building to 3 to 5 ft.
.FRIDAY...East winds 15 to 20 kt. Mostly cloudy. Waves 3 to 6 ft
occasionally to 8 ft.
.FRIDAY NIGHT...East winds 15 to 20 kt becoming southeast
overnight. Slight chance of showers in the evening, then showers
and a chance of thunderstorms overnight. Waves 3 to 5 ft building
to 4 to 7 ft occasionally to 9 ft.
.SATURDAY...Southeast winds 10 to 20 kt. Showers and a chance of
thunderstorms. Waves 4 to 7 ft occasionally to 9 ft.

$$

LMZ741-742-180915-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
937 PM CDT Thu Sep 17 2026

.REST OF TONIGHT...Northeast winds 10 to 15 kt. Patchy fog late
in the evening. Waves 2 to 4 ft.
.FRIDAY...East winds around 15 kt. Mostly cloudy. Waves 3 to
5 ft.
.FRIDAY NIGHT...East winds 15 to 20 kt becoming southeast
overnight. Showers likely and a chance of thunderstorms
overnight. Waves 2 to 4 ft building to 4 to 6 ft occasionally to
8 ft. A Small Craft Advisory will likely be needed.
.SATURDAY...Southeast winds 15 to 20 kt diminishing to 10 to
15 kt. Showers and a chance of thunderstorms. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft. A Small Craft
Advisory will likely be needed.

$$

LMZ743>745-180915-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
937 PM CDT Thu Sep 17 2026

.REST OF TONIGHT...Northeast winds 10 to 15 kt. Mostly cloudy.
Waves 1 to 3 ft building to 2 to 4 ft.
.FRIDAY...East winds 10 to 15 kt becoming northeast. Mostly
cloudy. Waves 2 to 4 ft subsiding to 1 to 3 ft in the afternoon.
.FRIDAY NIGHT...East winds 10 to 15 kt becoming southeast
overnight. Showers likely and slight chance of thunderstorms
overnight. Waves 1 to 3 ft.
.SATURDAY...Southeast winds 10 to 15 kt. Showers and slight
chance of thunderstorms in the morning, then showers and a chance
of thunderstorms in the afternoon. Waves 1 to 3 ft.

$$

Ogorek