FZUS53 KLOT 190251
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
951 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>742-190930-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
951 PM CDT Mon May 18 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 6 AM CDT TUESDAY THROUGH
TUESDAY AFTERNOON...

.REST OF 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 20 to 25 kt becoming west 15 to 25 kt 
in the late afternoon. Chance of showers and slight chance of 
thunderstorms. Waves 3 to 5 ft subsiding to 2 to 4 ft. 
.TUESDAY NIGHT...Northwest winds 15 to 20 kt becoming north
overnight. 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>745-190930-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
951 PM CDT Mon May 18 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 6 AM CDT TUESDAY THROUGH
TUESDAY AFTERNOON...

.REST OF TONIGHT...South winds 15 to 25 kt. Chance of showers and
slight chance of thunderstorms after midnight. Waves 1 to 3 ft 
building to 2 to 4 ft. 
.TUESDAY...Southwest winds 20 to 25 kt becoming west 15 to 25 kt
in the late afternoon. 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
overnight. 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.  

$$
DK