Nearshore Marine Forecast
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
183 FZUS53 KLOT 291449 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 949 AM CDT Tue Jul 29 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>742-292115- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 949 AM CDT Tue Jul 29 2025 .REST OF TODAY...South winds 5 to 10 kt becoming southeast in the afternoon. Slight chance of showers and thunderstorms mid to late afternoon. Waves around 1 ft. .TONIGHT...Northwest winds 5 to 10 kt becoming north 10 to 15 kt overnight. Slight chance of showers and thunderstorms. Waves 1 to 2 ft. .WEDNESDAY...North winds 10 to 15 kt increasing to 15 to 20 kt. Chance of showers and thunderstorms. Waves 2 to 4 ft building to 3 to 5 ft. A small craft advisory may be needed. .WEDNESDAY NIGHT...Northeast winds 20 to 25 kt. Chance of showers and thunderstorms. Waves 4 to 7 ft occasionally to 9 ft. A small craft advisory will likely be needed. $$ LMZ743>745-292115- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 949 AM CDT Tue Jul 29 2025 .REST OF TODAY...South winds 5 to 10 kt becoming northeast in the afternoon. Mostly sunny. Waves around 1 ft. .TONIGHT...Northwest winds 5 to 10 kt becoming north 10 to 15 kt overnight. Partly cloudy in the evening, then becoming mostly cloudy. Waves 1 ft or less building to 1 to 2 ft. .WEDNESDAY...Northeast winds 10 to 15 kt becoming north 15 to 20 kt. Chance of showers and thunderstorms. Waves 1 to 2 ft building to 2 to 4 ft. .WEDNESDAY NIGHT...Northeast winds 15 to 20 kt. Chance of showers and thunderstorms in the evening, then showers likely and a chance of thunderstorms overnight. Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft. A small craft advisory will likely be needed. $$ Kluber