NWS Marine Forecast

   LMZ740>742-121015-  Winthrop Harbor to Wilmette Harbor IL-  Wilmette Harbor to Northerly Island IL-  Northerly Island to Calumet Harbor IL-  644 PM CST Wed Nov 11 2026    SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 6 AM  CST THURSDAY  GALE WARNING IN EFFECT FROM 6 AM CST THURSDAY THROUGH THURSDAY  AFTERNOON  SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY AFTERNOON THROUGH  LATE FRIDAY NIGHT    REST OF TONIGHT  North winds 10 to 20 kt increasing to 20 to  25 kt after midnight. Isolated rain showers. Waves 3 to 6 ft  increasing to 4 to 7 ft occasionally to 9 ft.  THURSDAY  North gales to 35 kt. On and off rain with a slight  chance of a waterspout. Waves 4 to 7 ft occasionally to 9 ft  building to 10 to 14 ft occasionally to 18 ft.  THURSDAY NIGHT  North winds to 30 kt with a few gale force gusts  to 35 kt. On and off rain possibly mixed with snow with a slight  chance of waterspouts. Waves 10 to 14 ft occasionally to 18 ft  subsiding to 7 to 10 ft occasionally to 13 ft.  FRIDAY  North winds 15 to 25 kt. On and off rain possibly mixed  with snow with a slight chance of waterspouts. Waves 5 to 8 ft  occasionally to 10 ft.    $$