FZUS53 KLOT 200156 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 856 PM CDT Mon May 19 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>742-200915- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 856 PM CDT Mon May 19 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .REST OF TONIGHT...Northeast winds 15 to 25 kt increasing to 30 kt with a few gale force gusts by daybreak. Rain by daybreak Tuesday. Waves 3 to 5 ft building to 6 to 9 ft occasionally to 12 ft. .TUESDAY...East winds to 30 kt with a few gale force gusts to 35 kt. Showers. Waves 7 to 10 ft occasionally to 13 ft. .TUESDAY NIGHT...East winds to 30 kt diminishing to 10 to 20 kt. Scattered showers and drizzle. Waves 6 to 9 ft occasionally to 12 ft subsiding to 4 to 7 ft occasionally to 9 ft. .WEDNESDAY...Northeast winds 10 to 20 kt becoming northwest in the afternoon. Scattered showers and drizzle. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft. $$ LMZ743>745-200915- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 856 PM CDT Mon May 19 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TUESDAY NIGHT... .REST OF TONIGHT...East winds 15 to 25 kt increasing to 30 kt. Rain by daybreak Tuesday. Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft. .TUESDAY...East winds to 30 kt with a few gale force gusts to 35 kt. Showers and perhaps a thunderstorm. Waves 4 to 6 ft occasionally to 8 ft. .TUESDAY NIGHT...Southeast winds to 30 kt diminishing to 10 to 15 kt. Scattered showers and drizzle. Waves 3 to 5 ft subsiding to 2 to 4 ft. .WEDNESDAY...Southwest winds 10 to 20 kt becoming west in the afternoon. Scattered showers and areas of drizzle. Waves 1 to 3 ft building to 2 to 4 ft. $$ Borchardt