712
FZUS53 KLOT 200936
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
336 AM CST Thu Nov 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>742-201630-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
336 AM CST Thu Nov 20 2025

.TODAY...Southwest winds around 10 kt. Patchy drizzle and fog in
the morning, then a chance of drizzle again late in the afternoon.
Waves 1 to 2 ft.
.TONIGHT...Southwest winds around 10 kt becoming west overnight.
Chance of drizzle in the evening. Waves around 1 ft.
.FRIDAY...Northwest winds 10 to 15 kt becoming north. Slight
chance of rain in the afternoon. Waves 1 to 2 ft.
.FRIDAY NIGHT...North winds 10 to 15 kt becoming northeast.
Slight chance of rain in the evening. Waves 1 to 3 ft building to
2 to 4 ft.

$$

LMZ743>745-201630-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
336 AM CST Thu Nov 20 2025

.TODAY...South winds around 10 kt becoming southwest. Patchy
drizzle and fog in the morning, then a chance of drizzle in the
afternoon. Waves around 1 ft.
.TONIGHT...Southwest winds around 10 kt becoming west overnight.
Chance of drizzle in the evening. Waves around 1 ft.
.FRIDAY...North winds 10 to 15 kt. Slight chance of rain in the
afternoon. Waves 1 to 3 ft.
.FRIDAY NIGHT...North winds 10 to 15 kt becoming northeast.
Slight chance of rain in the evening. Waves 2 to 4 ft.

$$

- Izzi