| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 305 AM CDT Mon May 19 2025 | |
Today: Northeast winds 15 to 25 kt. Mostly cloudy. Waves 3 to 6 ft occasionally to 8 ft. Tonight: Northeast winds 15 to 25 kt becoming east and increasing to 30 kt overnight. Occasional 35 kt gales possible late. Showers likely overnight. Waves 3 to 6 ft occasionally to 8 ft building to 5 to 8 ft occasionally to 10 ft. Tuesday: East winds to 30 kt with occasional 35 kt gales. Rain and slight chance of thunderstorms. Waves 7 to 10 ft occasionally to 13 ft. Tuesday Night: East winds to 30 kt becoming northeast and diminishing to 15 to 25 kt. Showers and a chance of thunderstorms in the evening, then showers likely and slight chance of thunderstorms overnight. Waves 6 to 9 ft occasionally to 12 ft subsiding to 5 to 8 ft occasionally to 10 ft. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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