955
FZUS53 KLOT 180232
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
932 PM CDT Sun Aug 17 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>742-180930-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
932 PM CDT Sun Aug 17 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY MORNING...

.REST OF TONIGHT...Northeast winds 10 to 20 kt becoming southeast
late. Becoming mostly cloudy. Waves 3 to 6 ft occasionally to 8
ft.
.MONDAY...Southeast winds 10 to 20 kt diminishing to 10 to 15 kt.
Slight chance of showers in the morning, then chance of showers
and thunderstorms in the afternoon. Waves 4 to 6 ft occasionally
to 8 ft subsiding to 2 to 4 ft.
.MONDAY NIGHT...Southeast winds 10 to 15 kt becoming south
overnight. Showers and thunderstorms likely. Waves 1 to 3 ft.
.TUESDAY...Southwest winds 10 to 15 kt becoming northwest in the
afternoon. Chance of showers and thunderstorms, mainly in the
morning. Waves 1 to 2 ft.

$$

LMZ743>745-180930-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
932 PM CDT Sun Aug 17 2025

.REST OF TONIGHT...Northeast winds around 10 becoming southeast
10 to 20 kt overnight. Becoming mostly cloudy. Waves 2 to 4 ft
building to 3 to 5 ft.
.MONDAY...Southeast winds 10 to 20 kt diminishing to 5 to 10 kt.
Chance of showers and thunderstorms in the afternoon. Waves 3 to 5
ft subsiding to 1 to 2 ft.
.MONDAY NIGHT...South winds 10 to 15 kt. Showers and thunderstorms
likely, mainly from late evening into the overnight. Waves around
1 ft.
.TUESDAY...Southwest winds 10 to 15 kt becoming west in the
afternoon. Chance of showers and thunderstorms. Waves around
1 ft.

$$

- Izzi