NWS Marine Forecast



 Hazardous marine condition(s):
 Hazardous Weather Outlook
 Small Craft Advisory
   LMZ740>742-061530-  Winthrop Harbor to Wilmette Harbor IL-  Wilmette Harbor to Northerly Island IL-  Northerly Island to Calumet Harbor IL-  304 AM CDT Mon Apr 6 2026    SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM CDT THIS MORNING  THROUGH TUESDAY AFTERNOON    TODAY  Northwest winds 15 to 20 kt increasing to 20 to 25 kt.  Mostly cloudy. Waves 1 to 3 ft building to 2 to 4 ft.  TONIGHT  North winds 20 to 25 kt. Slight chance of rain and  snow showers in the evening, then slight chance of snow showers  overnight. Waves 3 to 6 ft occasionally to 8 ft building to 5 to  8 ft occasionally to 10 ft.  TUESDAY  Northeast winds 10 to 20 kt in the morning, becoming  east around 10 kt in the afternoon. Mostly cloudy in the morning  then clearing. Waves 4 to 7 ft occasionally to 9 ft subsiding to  2 to 4 ft.  TUESDAY NIGHT  East winds 10 to 15 kt becoming southeast 15 to  20 kt overnight. Slight chance of rain and snow showers  overnight. Waves 1 to 3 ft building to 2 to 4 ft.    $$