Coastal Waters Forecast for Calumet Harbor IL to Gary IN (LMZ743) (Text-Only)
NWS Forecast for: Calumet Harbor IL to Gary IN (LMZ743)
Issued by: National Weather Service Chicago, IL
Last Update: 511 PM CST Fri Mar 6 2026




Tonight: South winds 20 to 25 kt becoming southwest to 30 kt. Chance of showers and thunderstorms in the evening, then showers and a chance of thunderstorms after midnight. Some thunderstorms may be severe with damaging winds and large hail in the evening. waves 1 to 3 ft building to 2 to 4 ft.

Saturday: Southwest winds 20 to 25 kt becoming west 15 to 25 kt in the afternoon. Showers and a chance of thunderstorms in the morning, then slight chance of showers and thunderstorms in the afternoon. Waves 2 to 4 ft.

Saturday Night: West winds 10 to 15 kt. Mostly cloudy in the evening then clearing. Waves 2 to 4 ft subsiding to 1 to 2 ft.

Sunday: Southwest winds 15 to 20 kt. Partly cloudy in the morning then clearing. Waves 1 to 3 ft building to 2 to 4 ft.







Zone Forecast: Calumet Harbor IL to Gary IN (LMZ743)

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