FZUS53 KLOT 040830 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 330 AM CDT Mon May 4 2026 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>742-041515- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 330 AM CDT Mon May 4 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM CDT THIS MORNING THROUGH THIS EVENING... .TODAY...Southwest winds 10 to 15 kt increasing to 20 to 25 kt later this morning. A few gusts to 30 kt this afternoon. Mostly sunny. Waves 1 to 3 ft. .TONIGHT...Southwest winds 10 to 20 kt becoming northwest 10 to 15 kt overnight. Chance of showers and thunderstorms in the evening, then slight chance of showers overnight. Waves 1 to 3 ft. .TUESDAY...North winds around 10 kt becoming northeast in the afternoon. Slight chance of showers. Waves 1 to 3 ft. .TUESDAY NIGHT...Southeast winds around 10 kt becoming northwest overnight. Slight chance of showers in the evening. Waves 1 to 2 ft. $$ LMZ743>745-041515- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 330 AM CDT Mon May 4 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 10 AM CDT THIS MORNING THROUGH THIS EVENING... .TODAY...Southwest winds 10 to 15 kt increasing to 20 to 25 kt later this morning. A few gusts to 30 kt this afternoon. Mostly sunny. Waves 1 to 2 ft building to 2 to 4 ft. .TONIGHT...Southwest winds 15 to 20 kt becoming northwest 10 to 15 kt overnight. Showers likely and a chance of thunderstorms in the evening, then chance of showers and slight chance of thunderstorms overnight. Waves 2 to 4 ft subsiding to 1 to 3 ft. .TUESDAY...North winds around 10 kt becoming northeast in the afternoon. Slight chance of showers in the morning, then chance of showers in the afternoon. Waves 1 to 3 ft. .TUESDAY NIGHT...East winds around 10 kt becoming north overnight. Slight chance of showers in the evening. Waves 1 to 2 ft. $$ - Izzi