FZUS53 KLOT 182046
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
346 PM CDT Mon May 18 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>742-190345-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
346 PM CDT Mon May 18 2026

.TONIGHT...Southwest winds 15 to 25 kt becoming south. Chance of 
showers and slight chance of thunderstorms after midnight. Waves 2
to 4 ft.
.TUESDAY...Southwest winds 15 to 25 kt becoming west in the
afternoon. Chance of showers and slight chance of thunderstorms
in the morning, then chance of showers and thunderstorms in the
afternoon. Waves 3 to 5 ft subsiding to 2 to 4 ft. 
.TUESDAY NIGHT...Northwest winds 15 to 20 kt becoming north.
Slight chance of showers and thunderstorms in the evening. Waves
1 to 3 ft building to 2 to 4 ft. 
.WEDNESDAY...North winds 15 to 20 kt becoming northeast. Partly
cloudy. Waves 2 to 4 ft building to 3 to 5 ft.  

$$

LMZ743>745-190345-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
346 PM CDT Mon May 18 2026

.TONIGHT...South winds 15 to 25 kt. Chance of showers and slight 
chance of thunderstorms after midnight. Waves 2 to 4 ft. 
.TUESDAY...Southwest winds 15 to 25 kt. Slight chance of showers 
and thunderstorms in the morning, then chance of showers and 
thunderstorms in the afternoon. Waves 2 to 4 ft. 
.TUESDAY NIGHT...Northwest winds 15 to 20 kt becoming north.
Showers likely and a chance of thunderstorms in the evening.
Waves 2 to 4 ft. 
.WEDNESDAY...North winds 15 to 20 kt. Mostly cloudy in the
morning, then becoming partly cloudy. Waves 3 to 5 ft.  

$$

KMD