250
FZUS53 KLOT 041455
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
955 AM CDT Thu Sep 4 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.

LMZ740-042115-
Winthrop Harbor to Wilmette Harbor IL-
955 AM CDT Thu Sep 4 2025

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
MORNING...

.REST OF TODAY...Northwest winds 10 to 15 kt becoming west late.
Partly cloudy. Waves 1 to 3 ft.
.TONIGHT...Southwest winds around 20 kt increasing to gales to 40
kt. Slight chance of showers overnight. Waves 1 to 3 ft building
to 3 to 5 ft.
.FRIDAY...West gales to 40 kt diminishing to 20 to 25 kt. Partly
cloudy. Waves 3 to 5 ft subsiding to 2 to 4 ft.
.FRIDAY NIGHT...West winds around 20 kt diminishing to 10 to
15 kt. Partly cloudy in the evening then clearing. Waves 1 to
3 ft.

$$

LMZ741>743-042115-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-
955 AM CDT Thu Sep 4 2025

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
MORNING...

.REST OF TODAY...Northwest winds 10 to 15 kt becoming west late.
Mostly sunny late in the morning, then becoming partly cloudy.
Waves 3 to 5 ft subsiding to 2 to 4 ft this afternoon.
.TONIGHT...Southwest winds around 20 kt increasing to gales to 40
kt. Mostly clear in the evening, then becoming mostly cloudy.
Waves 3 to 5 ft.
.FRIDAY...West gales to 40 kt diminishing to 20 to 25 kt. Partly
cloudy. Waves 2 to 4 ft.
.FRIDAY NIGHT...West winds around 20 kt diminishing to 10 to
15 kt. Partly cloudy in the evening then clearing. Waves 1 to
3 ft.

$$

LMZ744-745-042115-
Gary to Burns Harbor IN-Burns Harbor to Michigan City IN-
955 AM CDT Thu Sep 4 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 PM CDT THIS AFTERNOON...
...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
MORNING...

.REST OF TODAY...Northwest winds around 20 kt becoming west 10 to
15 kt. Partly cloudy late in the morning then clearing. Waves
3 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft this
afternoon.
.TONIGHT...Southwest winds around 20 kt becoming south gales to 40
kt. Mostly clear in the evening, then becoming mostly cloudy.
Waves 3 to 5 ft.
.FRIDAY...West gales to 40 kt diminishing to 20 to 25 kt in the
afternoon. Partly cloudy. Waves 4 to 6 ft occasionally to 8 ft.
.FRIDAY NIGHT...West winds around 20 kt. Partly cloudy in the
evening then clearing. Waves 2 to 4 ft.

$$

Borchardt