


Nearshore Marine Forecast
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
790 FZUS53 KLOT 241452 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 952 AM CDT Sun Aug 24 2025 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>742-242130- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 952 AM CDT Sun Aug 24 2025 .REST OF TODAY...West winds 10 to 20 kt becoming northwest 15 to 25 kt. Slight chance of showers in the afternoon. Waves 1 to 3 ft building to 2 to 4 ft. .TONIGHT...Northwest winds 15 to 25 kt. Slight chance of showers in the evening. Waves 2 to 4 ft. .MONDAY...Northwest winds 15 to 20 kt. Partly cloudy. Waves 2 to 4 ft. .MONDAY NIGHT...Northwest winds 10 to 15 kt. Mostly clear. Waves 1 to 3 ft. $$ LMZ743-744-242130- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- 952 AM CDT Sun Aug 24 2025 .REST OF TODAY...West winds 10 to 20 kt becoming northwest 15 to 25 kt. Slight chance of showers in the afternoon. Waves 2 to 4 ft building to 3 to 5 ft. .TONIGHT...Northwest winds 15 to 25 kt. Slight chance of showers in the evening. Waves 3 to 5 ft. .MONDAY...Northwest winds 15 to 20 kt. Partly cloudy. Waves 3 to 5 ft. .MONDAY NIGHT...Northwest winds 10 to 15 kt. Partly cloudy. Waves 2 to 4 ft. $$ LMZ745-242130- Burns Harbor to Michigan City IN- 952 AM CDT Sun Aug 24 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY AFTERNOON... .REST OF TODAY...West winds 10 to 20 kt becoming northwest 15 to 25 kt. Slight chance of showers late in the afternoon. Waves 3 to 6 ft occasionally to 8 ft. .TONIGHT...Northwest winds 20 to 25 kt. Slight chance of showers. Waves 4 to 6 ft occasionally to 8 ft. .MONDAY...Northwest winds 15 to 20 kt. Slight chance of showers in the morning. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft. .MONDAY NIGHT...Northwest winds 10 to 20 kt. Slight chance of showers. Waves 2 to 4 ft. $$ Kluber