Northerly Island To Calumet Harbor-Calumet Harbor To Gary-
Southwest winds 10 to 15 kt becoming northwest 15 to 20 kt late in the evening, then becoming northeast overnight. Partly cloudy. Waves 1 ft or less building to 2 to 4 ft.
Northeast winds 15 to 20 kt becoming east in the afternoon. Mostly cloudy. Waves 2 to 4 ft.
Southeast winds 15 to 25 kt increasing to 30 kt after midnight. Slight chance of rain in the evening, then rain likely after midnight. Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft after midnight. A Small Craft Advisory will likely be needed.
South winds to 30 kt becoming southwest in the afternoon. Rain in the morning, then rain likely in the afternoon. Waves 3 to 5 ft subsiding to 2 to 4 ft in the afternoon. A Small Craft Advisory will likely be needed.