


Nearshore Marine Forecast
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
591 FZUS53 KLOT 300248 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 948 PM 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>742-301200- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 948 PM CDT Tue Jul 29 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH FRIDAY MORNING... .REST OF TONIGHT...Northeast winds 5 to 10 kt becoming north and increasing to 10 to 15 kt. Increasing cloudiness. Waves around 1 ft building to 1 to 2 ft. .WEDNESDAY...Northeast winds 10 to 15 kt increasing to 15 to 25 kt in the afternoon. Chance of showers and thunderstorms in the morning, then showers likely and a chance of thunderstorms in the afternoon. Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft in the afternoon. .WEDNESDAY NIGHT...Northeast winds to 30 kt. Occasional gale gusts to 35 kt possible. Showers likely and a chance of thunderstorms. Waves 5 to 8 ft occasionally to 10 ft. .THURSDAY...Northeast winds 15 to 25 kt. Slight chance of showers and thunderstorms in the morning. Waves 4 to 7 ft occasionally to 9 ft. $$ LMZ743>745-301200- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 948 PM CDT Tue Jul 29 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH FRIDAY MORNING... .REST OF TONIGHT...North winds around 5 kt becoming northeast. Increasing cloudiness. Waves around 1 ft. .WEDNESDAY...Northeast winds 10 to 15 kt increasing to 15 to 25 kt in the afternoon. Chance of showers and thunderstorms in the morning, then showers likely and a chance of thunderstorms in the afternoon. Waves 1 to 3 ft building to 3 to 6 ft occasionally to 8 ft in the afternoon. .WEDNESDAY NIGHT...Northeast winds to 30 kt becoming east. Showers and a chance of thunderstorms. Waves 4 to 7 ft occasionally to 9 ft. .THURSDAY...Northeast winds 15 to 25 kt. Chance of showers and slight chance of thunderstorms in the morning. Waves 4 to 6 ft occasionally to 8 ft. $$ DK