FZUS53 KLOT 211413

NSHLOT



Nearshore Marine Forecast

National Weather Service Chicago/Romeoville IL

913 AM CDT Tue Apr 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.



LMZ740-212115-

Winthrop Harbor to Wilmette Harbor IL-

913 AM CDT Tue Apr 21 2026



.REST OF TODAY...South winds 15 to 25 kt becoming southwest in 

the afternoon. Chance of showers and thunderstorms in the 

afternoon. Waves 2 to 4 ft.

.TONIGHT...West winds 10 to 15 kt becoming north overnight.

Patchy fog in the evening, then areas of fog overnight. Waves

1 to 2 ft. 

.WEDNESDAY...North winds around 10 kt becoming northeast in the

afternoon. Areas of fog in the morning, then patchy fog in the

afternoon. Waves 1 to 2 ft. 

.WEDNESDAY NIGHT...Southeast winds around 10 kt becoming south

overnight. Partly cloudy. Waves 1 to 2 ft.  



$$



LMZ741-742-212115-

Wilmette Harbor to Northerly Island IL-

Northerly Island to Calumet Harbor IL-

913 AM CDT Tue Apr 21 2026



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



.REST OF TODAY...South winds 15 to 20 kt becoming southwest and 

increasing to 20 to 25 kt, then diminishing to 15 to 20 kt late in

the afternoon. Chance of showers and thunderstorms in the 

afternoon. Waves 1 to 3 ft. 

.TONIGHT...Southwest winds 10 to 15 kt becoming northwest

overnight. Slight chance of showers and thunderstorms in the

evening. Patchy fog in the evening, then areas of fog overnight.

Waves 1 to 2 ft. 

.WEDNESDAY...North winds around 10 kt becoming northeast in the

afternoon. Areas of fog in the morning, then patchy fog in the

afternoon. Waves 1 to 2 ft. 

.WEDNESDAY NIGHT...Southeast winds around 10 kt becoming south

overnight. Mostly cloudy in the evening, then becoming partly

cloudy. Waves 1 to 2 ft.  



$$



LMZ743>745-212115-

Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-

Burns Harbor to Michigan City IN-

913 AM CDT Tue Apr 21 2026



...SMALL CRAFT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING...



.REST OF TODAY...South winds 15 to 25 kt becoming southwest and 

increasing to 20 to 25 kt. Chance of showers and thunderstorms in 

the afternoon. Waves 1 to 3 ft. 

.TONIGHT...Southwest winds 10 to 20 kt becoming northwest 

overnight. Chance of showers and thunderstorms in the evening. 

Areas of fog overnight. Waves 1 to 3 ft subsiding to around 1 ft.

.WEDNESDAY...North winds around 10 kt. Areas of fog in the

morning. Waves around 1 ft. 

.WEDNESDAY NIGHT...East winds around 10 kt becoming south

overnight. Partly cloudy. Waves around 1 ft.  



$$



Ratzer