316
FZUS53 KLOT 030837
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
337 AM CDT Wed Sep 3 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.

LMZ740-031530-
Winthrop Harbor to Wilmette Harbor IL-
337 AM CDT Wed Sep 3 2025

.TODAY...Southwest winds 15 to 20 kt becoming west in the
afternoon. Slight chance of thunderstorms with isolated showers
in the morning, then numerous showers and a chance of
thunderstorms in the afternoon. Waves 1 to 2 ft.
.TONIGHT...Northwest winds 15 to 25 kt. Scattered showers and a
chance of thunderstorms early in the evening. Waves 2 to 4 ft.
.THURSDAY...Northwest winds 10 to 15 kt becoming west in the
afternoon. Mostly sunny. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.THURSDAY NIGHT...Southwest winds around 20 kt increasing to
30 kt. Slight chance of showers in the evening, then chance of
showers overnight. Waves 1 to 3 ft building to 3 to 5 ft.

$$

LMZ741-031530-
Wilmette Harbor to Northerly Island IL-
337 AM CDT Wed Sep 3 2025

.TODAY...Southwest winds 15 to 20 kt becoming west in the
afternoon. Numerous showers and a chance of thunderstorms in the
afternoon. Waves 1 to 2 ft.
.TONIGHT...Northwest winds 15 to 25 kt. Scattered showers and a
chance of thunderstorms early in the evening. Waves 2 to 4 ft
building to 3 to 5 ft.
.THURSDAY...Northwest winds 10 to 15 kt becoming west in the
afternoon. Mostly sunny. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.THURSDAY NIGHT...Southwest winds 20 to 25 kt. Chance of showers
overnight. Waves 1 to 3 ft building to 2 to 4 ft.

$$

LMZ742-743-031530-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-
337 AM CDT Wed Sep 3 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH LATE
TONIGHT...

.TODAY...Southwest winds around 20 kt becoming west in the
afternoon. Numerous showers and a chance of thunderstorms in the
afternoon. Waves 1 to 3 ft.
.TONIGHT...Northwest winds 20 to 25 kt easing to 10 to 20 kt late.
Scattered showers and a chance of thunderstorms early in the
evening. Waves 3 to 5 ft.
.THURSDAY...Northwest winds 10 to 15 kt becoming west in the
afternoon. Mostly sunny. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.THURSDAY NIGHT...Southwest winds 20 to 25 kt becoming south.
Slight chance of showers overnight. Waves 1 to 3 ft building to
2 to 4 ft.

$$

LMZ744-745-031530-
Gary to Burns Harbor IN-Burns Harbor to Michigan City IN-
337 AM CDT Wed Sep 3 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
THURSDAY AFTERNOON...

.TODAY...Southwest winds around 20 kt becoming west in the
afternoon. Numerous showers and a chance of thunderstorms in the
afternoon. Waves 1 to 2 ft building to 2 to 4 ft late.
.TONIGHT...Northwest winds 20 to 25 kt. Numerous showers and a
chance of thunderstorms early in the evening. Waves 3 to 5 ft
building to 4 to 6 ft occasionally to 8 ft.
.THURSDAY...Northwest winds around 20 kt becoming west 10 to
15 kt in the afternoon. Mostly sunny. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 2 to 4 ft.
.THURSDAY NIGHT...Southwest winds 20 to 25 kt becoming south.
Slight chance of showers overnight. Waves 1 to 3 ft building to
3 to 5 ft.

$$

KJB