470
FZUS53 KLOT 181437
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
837 AM CST Tue Nov 18 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>742-182215-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
837 AM CST Tue Nov 18 2025

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

.REST OF TODAY...Southeast winds 20 to 25 kt. Chance of showers
and drizzle. Waves 4 to 6 ft occasionally to 8 ft.
.TONIGHT...East winds 10 to 15 kt becoming northeast. Slight
chance of drizzle in the evening. Waves 4 to 6 ft occasionally to
8 ft subsiding to 2 to 4 ft.
.WEDNESDAY...East winds 10 to 15 kt becoming southeast. Mostly
cloudy. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.WEDNESDAY NIGHT...South winds around 5 kt becoming southwest
overnight. Mostly cloudy. Waves 1 to 2 ft.

$$

LMZ743>745-182215-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
837 AM CST Tue Nov 18 2025

.REST OF TODAY...Southeast winds 15 to 20 kt becoming east.
Chance of showers and drizzle. Waves 2 to 4 ft.
.TONIGHT...East winds 10 to 15 kt. Slight chance of drizzle in
the evening. Waves 2 to 4 ft.
.WEDNESDAY...East winds 10 to 15 kt. Mostly cloudy. Waves 1 to
3 ft.
.WEDNESDAY NIGHT...Southeast winds around 5 kt becoming southwest
overnight. Mostly cloudy. Waves 1 ft or less.

$$

Borchardt