


Nearshore Marine Forecast
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
415 FZUS53 KLOT 210224 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 924 PM CDT Wed Aug 20 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>742-211000- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 924 PM CDT Wed Aug 20 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 AM CDT THURSDAY... .REST OF TONIGHT...Northeast winds 15 to 25 kt becoming east and diminishing to 10 to 15 kt. Mostly cloudy late in the evening, then becoming partly cloudy. Waves 3 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft late. .THURSDAY...Northeast winds 10 to 15 kt. Mostly cloudy in the morning then clearing. Waves 3 to 5 ft subsiding to 2 to 4 ft in the afternoon. .THURSDAY NIGHT...North winds 10 to 15 kt becoming northeast 5 to 10 kt. Mostly clear. Waves 1 to 3 ft. .FRIDAY...North winds 5 to 10 kt becoming east in the afternoon. Mostly sunny. Waves 1 to 2 ft. $$ LMZ743>745-211000- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 924 PM CDT Wed Aug 20 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 AM CDT THURSDAY... .REST OF TONIGHT...Northeast winds 15 to 20 kt becoming east and diminishing to 10 to 15 kt. Mostly cloudy late in the evening then clearing. Waves 3 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft late. .THURSDAY...Northeast winds 10 to 15 kt becoming north in the afternoon. Mostly cloudy in the morning then clearing. Waves 3 to 5 ft subsiding to 2 to 4 ft in the afternoon. .THURSDAY NIGHT...Northeast winds 10 to 15 kt becoming east 5 to 10 kt overnight. Clear. Waves 1 to 3 ft. .FRIDAY...East winds 5 to 10 kt becoming northeast in the afternoon. Sunny. Waves 1 to 2 ft. $$ Carlaw