Nearshore Marine Forecast
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
586 FZUS53 KLOT 282047 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 347 PM CDT Thu Aug 28 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>742-290345- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 347 PM CDT Thu Aug 28 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON... .TONIGHT...Northeast winds 20 to 25 kt diminishing to 10 to 20 kt towards daybreak. Partly cloudy this evening then becoming mostly clear. Waves building to 5 to 8 ft occasionally to 10 ft, then subsiding to 4 to 6 ft occasionally to 8 ft late. .FRIDAY...Northeast winds 10 to 15 kt. Partly cloudy. Waves 3 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft in the early afternoon and then to 1 to 3 ft late. .FRIDAY NIGHT...Northeast winds 5 to 10 kt. Partly cloudy. Waves 1 to 3 ft. .SATURDAY...East winds 5 to 10 kt becoming northeast in the afternoon. Partly cloudy in the morning, then becoming mostly sunny. Waves around 1 ft. $$ LMZ743>745-290345- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 347 PM CDT Thu Aug 28 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY MORNING... .TONIGHT...North 15 to 20 kt increasing to 20 to 25 kt this evening and then diminishing to 10 to 20 kt towards daybreak and becoming northeast. Partly cloudy this evening then becoming mostly clear. Waves building to 5 to 8 ft occasionally to 10 ft, then subsiding to 4 to 6 ft occasionally to 8 ft late. .FRIDAY...Northeast winds 10 to 15 kt becoming north. Mostly sunny in the morning, then becoming partly cloudy. Waves 3 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft in the early afternoon and then to 1 to 3 ft late. .FRIDAY NIGHT...Northeast winds 5 to 10 kt becoming east overnight. Mostly clear. Waves 1 to 3 ft. .SATURDAY...Southeast winds 5 to 10 kt becoming northeast in the afternoon. Mostly sunny. Waves around 1 ft. $$ RC