Nearshore Marine Forecast
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
979 FZUS53 KLOT 061000 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 400 AM CST Sat Dec 6 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>742-061615- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 400 AM CST Sat Dec 6 2025 .TODAY...Northwest winds 15 to 20 kt becoming west and diminishing to around 10 kt. Mostly cloudy. Waves 1 to 3 ft. .TONIGHT...Southwest winds 10 to 15 kt becoming southeast overnight. Snow late in the evening and overnight. Waves 1 to 2 ft. .SUNDAY...North winds 10 to 20 kt increasing to 20 to 25 kt. Snow likely in the morning, then slight chance of snow showers in the afternoon. Waves 2 to 4 ft building to 4 to 7 ft occasionally to 9 ft. A small craft advisory will likely be needed. .SUNDAY NIGHT...North winds 10 to 20 kt becoming northeast overnight. Chance of snow showers. Waves 4 to 7 ft occasionally to 9 ft. $$ LMZ743>745-061615- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 400 AM CST Sat Dec 6 2025 .TODAY...West winds 15 to 20 kt diminishing to 10 to 15 kt. Cloudy. Waves 2 to 4 ft subsiding to 1 to 3 ft. .TONIGHT...South winds 10 to 15 kt becoming southeast overnight. Snow overnight. Waves 1 to 2 ft. .SUNDAY...Northeast winds 10 to 20 kt becoming north 20 to 25 kt in the afternoon. Snow likely in the morning, then chance of snow showers in the afternoon. Waves 2 to 4 ft building to 5 to 8 ft occasionally to 10 ft. A small craft advisory will likely be needed. .SUNDAY NIGHT...Northeast winds 15 to 20 kt becoming east 10 to 15 kt overnight. Chance of snow showers in the evening, then slight chance of snow showers overnight. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 7 ft occasionally to 9 ft. $$ Petr