FZUS53 KLOT 220247
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
947 PM CDT Fri Aug 21 2026

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>742-220930-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
947 PM CDT Fri Aug 21 2026

.REST OF TONIGHT...Southwest winds around 10 kt. Chance of 
showers before midnight. Waves 1 to 2 ft. 
.SATURDAY...Northwest winds 10 to 20 kt becoming north. Scattered
showers and slight chance of thunderstorms in the afternoon.
Waves 2 to 4 ft. 
.SATURDAY NIGHT...Northwest winds 10 to 15 kt becoming north.
Mostly clear. Waves 2 to 4 ft. 
.SUNDAY...Northwest winds 10 to 15 kt becoming north. Mostly
sunny. Waves 2 to 4 ft.

$$

LMZ743-744-220930-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
947 PM CDT Fri Aug 21 2026

.REST OF TONIGHT...Southwest winds around 10 kt. Chance of 
showers before midnight. Waves 1 to 2 ft. 
.SATURDAY...Northwest winds 10 to 20 kt becoming north in the
afternoon. Slight chance of thunderstorms with isolated showers
in the afternoon. Waves 2 to 4 ft. 
.SATURDAY NIGHT...Northwest winds 10 to 15 kt becoming north.
Mostly clear in the evening, then becoming partly cloudy. Waves
2 to 4 ft.
.SUNDAY...Northwest winds 10 to 20 kt becoming north in the
afternoon. Mostly sunny. Waves 3 to 5 ft.

$$

LMZ745-220930-
Burns Harbor to Michigan City IN-
947 PM CDT Fri Aug 21 2026

.REST OF TONIGHT...Southwest winds 10 kt. Chance of showers. 
Waves 1 to 2 ft. 
.SATURDAY...Northwest winds 15 to 20 kt. Slight chance of
thunderstorms with isolated showers in the afternoon. Waves 3 to
5 ft. A small craft advisory will likely be needed. 
.SATURDAY NIGHT...Northwest winds 15 to 20 kt becoming north.
Slight chance of showers overnight. Waves 3 to 5 ft. 
.SUNDAY...Northwest winds 15 to 20 kt becoming north. Mostly
sunny. Waves 3 to 6 ft occasionally to 8 ft. A small craft 
advisory will likely be needed.

$$

Borchardt