NWS Marine Forecast

   LMZ740>742-310915-  Winthrop Harbor to Wilmette Harbor IL-  Wilmette Harbor to Northerly Island IL-  Northerly Island to Calumet Harbor IL-  927 PM CDT Mon Mar 30 2026    SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY EVENING  SEVERE THUNDERSTORM WATCH 77 IN EFFECT UNTIL 3 AM CDT  TUESDAY    REST OF TONIGHT  South winds 20 to 25 kt becoming southwest  with a few gusts around 30 kt. Scattered thunderstorms. Some  storms could be severe with damaging winds and large hail. Waves  2 to 4 ft. Winds and waves higher in and near thunderstorms.  TUESDAY  Southwest winds 20 to 25 kt increasing to 30 kt.  Chance of showers and thunderstorms in the morning, then showers  with thunderstorms likely in the afternoon. Waves 2 to 4 ft.  TUESDAY NIGHT  North winds 20 to 25 kt. Rain showers with  thunderstorms likely in the evening, then chance of showers  overnight. Waves 3 to 5 ft building to 4 to 7 ft occasionally to  9 ft.  WEDNESDAY  Northeast winds 20 to 25 kt. Chance of showers.  Waves 5 to 8 ft occasionally to 10 ft.    $$