Tropical Moisture Brings Slight Risk of Excessive Rainfall to the Southwest; Strong to Locally Severe Storms on the Plains

Heavy rain and flash flooding are possible across portions of the Southwest through Friday, where Flood Watches are in effect. Strong to locally severe thunderstorms are possible today across portions of the Plains. A tropical wave is causing heavy rainfall in Puerto Rico and the Virgin Islands, which may cause urban and small stream flooding and landslides today. Read More >

Last Update: 949 AM CDT Thu Sep 18 2025

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Chicago, IL Local Forecast Office

6NM WNW Michigan City IN

Marine Zone Forecast

Rest Of Today
Southeast winds 5 to 10 kt becoming northeast 10 to 15 kt in the afternoon. Sunny. Waves around 1 ft.
Tonight
Northeast winds 5 to 10 kt becoming east overnight. Mostly clear. Waves 1 to 2 ft.
Friday
Southeast winds 5 to 10 kt becoming east in the afternoon. Mostly sunny in the morning, then becoming partly cloudy. Waves 1 to 2 ft.
Friday Night
East winds 10 to 15 kt becoming southeast overnight. Slight chance of showers and thunderstorms in the evening, then slight chance of showers overnight. Waves 1 to 3 ft.



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949 AM CDT Thu Sep 18 2025
 
 

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