Nearshore Marine Forecast
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
870 FZUS53 KLOT 271938 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 238 PM CDT Wed Aug 27 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>742-280315- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 238 PM CDT Wed Aug 27 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY AFTERNOON THROUGH FRIDAY AFTERNOON... .LATE THIS AFTERNOON...West winds at around 10 kt. Partly cloudy. Waves around 1 ft. .TONIGHT...West winds 10 to 15 kt. Scattered showers and a few thunderstorms after midnight. Waves 1 to 2 ft. .THURSDAY...West winds 10 to 15 kt becoming north and increasing to 20 to 25 kt in the afternoon. Scattered showers and a few thunderstorms. Waves 1 to 2 ft quickly building to 3 to 6 ft occasionally to 8 ft in the evening. .THURSDAY NIGHT...North winds 20 to 25 kt becoming northeast. Decreasing cloudiness. Waves 4 to 7 ft occasionally to 9 ft. .FRIDAY...Northeast winds 10 to 15 kt. Partly cloudy. Waves 3 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft. $$ LMZ743>745-280315- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 238 PM CDT Wed Aug 27 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY AFTERNOON THROUGH FRIDAY MORNING... .LATE THIS AFTERNOON...Variable winds at less than 10 kt. Partly cloudy. Waves around 1 ft. .TONIGHT...Southwest winds 10 to 15 kt. Scattered showers and a few thunderstorms after midnight. Waves 1 to 2 ft. .THURSDAY...West winds 10 to 15 kt becoming north and increasing to 20 to 25 kt in the evening. Scattered showers and a few storms. Waves 1 to 3 ft quickly building to 3 to 6 ft occasionally to 8 ft in the evening. .THURSDAY NIGHT...North winds 20 to 25 kt becoming northeast overnight. Waves 4 to 7 ft occasionally to 9 ft. .FRIDAY...Northeast winds 10 to 15 kt in the morning. Partly cloudy. Waves 3 to 5 ft subsiding to 2 to 4 ft. $$ Borchardt