Nearshore Marine Forecast
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
323 FZUS53 KLOT 151946 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 246 PM CDT Tue Jul 15 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>742-160315- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 246 PM CDT Tue Jul 15 2025 .TONIGHT...Southeast winds 10 to 15 kt becoming south late. Slight chance of showers. Waves 1 to 2 ft. .WEDNESDAY...Southeast winds 10 to 15 kt becoming southwest 15 to 20 kt in the late afternoon. Chance of showers and thunderstorms in the afternoon. Waves 1 to 2 ft. .WEDNESDAY NIGHT...Southwest winds 10 to 20 kt becoming northwest overnight. Showers and thunderstorms likely in the evening, then chance of showers and slight chance of thunderstorms overnight. Waves 1 to 3 ft. .THURSDAY...Northwest winds 10 to 20 kt becoming north 15 to 25 kt. Slight chance of showers and thunderstorms. Waves 1 to 3 ft building to 4 to 6 ft occasionally to 8 ft. A small craft advisory will likely be needed. $$ LMZ743>745-160315- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 246 PM CDT Tue Jul 15 2025 .TONIGHT...Northeast winds 10 to 15 kt becoming south 5 to 10 kt this evening. Slight chance of showers. Waves around 1 ft. .WEDNESDAY...South winds 5 to 10 kt increasing to 10 to 15 kt. Slight chance of showers and thunderstorms. Waves around 1 ft. .WEDNESDAY NIGHT...Southwest winds 10 to 15 kt becoming west overnight. Showers and thunderstorms likely in the evening, then chance of showers and slight chance of thunderstorms overnight. Waves 1 to 2 ft. .THURSDAY...Northwest winds 10 to 20 kt becoming north 15 to 25 kt. Slight chance of showers and thunderstorms. Waves 1 to 3 ft building to 4 to 6 ft occasionally to 8 ft. A small craft advisory will likely be needed. $$