720
FZUS53 KLOT 190224
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
924 PM CDT Mon Aug 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>742-190915-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
924 PM CDT Mon Aug 18 2025

.REST OF TONIGHT...South winds 10 to 15 kt becoming southwest
late. Showers and thunderstorms. Waves 1 to 3 ft.
.TUESDAY...Northwest winds 10 to 15 kt becoming north in the
afternoon. Chance of showers and thunderstorms in the morning,
then slight chance of showers and thunderstorms in the afternoon.
Waves 1 to 3 ft.
.TUESDAY NIGHT...North winds 10 to 20 kt. Mostly cloudy. Waves
2 to 4 ft building to 3 to 5 ft.
.WEDNESDAY...North winds 15 to 20 kt increasing to 20 to 25 kt.
Mostly cloudy in the morning, then becoming partly cloudy. Waves
4 to 6 ft occasionally to 8 ft. A small craft advisory will
likely be needed.

$$

LMZ743>745-190915-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
924 PM CDT Mon Aug 18 2025

.REST OF TONIGHT...South winds 10 to 20 kt becoming southwest
late. Showers and thunderstorms. Waves 1 TO 3 ft.
.TUESDAY...West winds 10 to 15 kt becoming north in the
afternoon. Chance of showers and thunderstorms in the morning,
then slight chance of showers and thunderstorms in the afternoon.
Waves 1 to 3 ft.
.TUESDAY NIGHT...North winds 15 to 20 kt. Mostly cloudy. Waves
2 to 4 ft building to 3 to 5 ft.
.WEDNESDAY...North winds 15 to 20 kt increasing to 20 to 25 kt.
Partly cloudy in the morning then clearing. Waves 3 to 5 ft. A
small craft advisory will likely be needed.

$$