FZUS53 KLOT 190908
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
408 AM CDT Tue May 19 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>742-191515-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
408 AM CDT Tue May 19 2026

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 PM CDT THIS AFTERNOON...

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

$$

LMZ743>745-191515-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
408 AM CDT Tue May 19 2026

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 PM CDT THIS AFTERNOON...

.TODAY...Southwest winds 20 to 25 kt becoming west 15 to 25 kt  
late. Slight chance of showers in the morning, then chance of 
showers and thunderstorms in the afternoon. Waves 1 to 3 ft
building to 2 to 4 ft.
.TONIGHT...Northwest winds 15 to 20 kt becoming north. Slight
chance of showers and thunderstorms in the evening. Waves 2 to 4 
ft. 
.WEDNESDAY...North winds 20 to 25 kt. Mostly cloudy in the
morning, then becoming partly cloudy. Waves 3 to 6 ft
occasionally to 8 ft. A small craft advisory may be needed.
.WEDNESDAY NIGHT...North winds 15 to 25 kt becoming northeast and
diminishing to around 15 kt overnight. Partly cloudy. Waves 4 to 
6 ft occasionally to 8 ft subsiding to 3 to 5 ft. 

$$

Ratzer