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Chicago, IL Local Forecast Office

20NM NNE Gary IN

Marine Zone Forecast

Tonight

South winds 15 to 25 kt becoming southwest. Patchy fog this evening, then areas of dense fog overnight. Thunderstorms likely with a chance of showers this evening, then showers likely with a chance of thunderstorms overnight. Waves 2 to 4 ft.

Wednesday

Southwest winds 10 to 20 kt becoming south. Areas of dense fog in the morning, then patchy dense fog in the afternoon. Rain showers likely with a chance of thunderstorms in the morning, then chance of rain showers and thunderstorms in the afternoon. Waves 1 to 3 ft.

Wednesday Night

South winds 10 to 20 kt diminishing to 10 to 15 kt. Patchy fog in the evening. Rain showers with a chance of thunderstorms. Waves 1 to 3 ft.

Thursday

Southwest winds 15 to 25 kt becoming west 10 to 15 kt in the afternoon. Rain showers likely in the morning, then rain showers likely with a chance of thunderstorms in the afternoon. Waves 1 to 3 ft.

Thursday Night

Northwest winds 5 to 10 kt becoming north. Waves 1 to 3 ft.

Friday

Southeast winds 5 to 10 kt increasing to 10 to 15 kt. Waves 1 to 2 ft building to 1 to 3 ft.

Friday Night

Southeast winds 15 to 25 kt becoming south. Showers with a chance of thunderstorms. Waves 3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.

Saturday

South winds 15 to 25 kt becoming southwest. Chance of showers. Waves 5 to 8 ft occasionally to 10 ft.

Sunday

West winds to 30 kt becoming northwest. Waves 8 to 12 ft occasionally to 16 ft.