FZUS53 KLOT 200247 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 947 PM CDT Tue May 19 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>742-200930- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 947 PM CDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM WEDNESDAY MORNING THROUGH LATE WEDNESDAY NIGHT... .REST OF TONIGHT...Northwest winds 10 to 20 kt becoming north after midnight. Mostly cloudy. Waves 1 to 3 ft building to 2 to 4 ft. .WEDNESDAY...North winds 15 to 20 kt becoming northeast 20 to 25 kt. Mostly cloudy in the morning, then becoming partly cloudy. Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft. .WEDNESDAY NIGHT...North winds 15 to 25 kt becoming northeast 15 to 20 kt. Partly cloudy. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 6 ft. .THURSDAY...East winds 15 to 20 kt becoming northeast in the afternoon. Partly cloudy in the morning, then becoming mostly cloudy. Waves 2 to 4 ft. $$ LMZ743>745-200930- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 947 PM CDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 7 AM CDT WEDNESDAY THROUGH LATE WEDNESDAY NIGHT... .REST OF TONIGHT...Northwest winds 10 to 20 kt becoming north after midnight. Mostly cloudy. Waves 1 to 3 ft building to 2 to 4 ft. .WEDNESDAY...North winds 20 to 25 kt. Mostly cloudy. Waves 3 to 5 ft building to 4 to 7 ft occasionally to 9 ft. .WEDNESDAY NIGHT...North winds 15 to 25 kt becoming northeast and diminishing to around 15 kt overnight. Partly cloudy. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft. .THURSDAY...East winds 15 to 20 kt becoming northeast in the afternoon. Partly cloudy. Waves 2 to 4 ft. $$ DK