


Nearshore Marine Forecast
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
184 FZUS53 KLOT 171505 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 1005 AM CDT Fri Oct 17 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>742-172115- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 1005 AM CDT Fri Oct 17 2025 .REST OF TODAY...South winds 15 to 25 kt. Partly cloudy. Waves 2 to 4 ft. .TONIGHT...South winds 15 to 25 kt. Showers likely and slight chance of thunderstorms overnight. Waves 2 to 4 ft. .SATURDAY...Southwest winds 15 to 20 kt. Showers and a chance of thunderstorms. Waves 2 to 4 ft subsiding to 1 to 3 ft. .SATURDAY NIGHT...Southwest winds 10 to 15 kt becoming west and increasing to 15 to 25 kt overnight. Showers and a chance of thunderstorms. Waves 1 to 2 ft building to 2 to 4 ft. $$ LMZ743>745-172115- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 1005 AM CDT Fri Oct 17 2025 .REST OF TODAY...South winds 15 to 20 kt. Mostly cloudy. Waves 1 to 2 ft. .TONIGHT...South winds 15 to 25 kt. Chance of showers overnight. Waves 1 to 3 ft. .SATURDAY...South winds 15 to 20 kt becoming southwest. Showers and a chance of thunderstorms. Waves 1 to 3 ft. .SATURDAY NIGHT...Southwest winds 10 to 15 kt becoming west and increasing to 15 to 25 kt overnight. Showers and a chance of thunderstorms. Waves 1 to 2 ft building to 3 to 5 ft. $$ Yack