Tracking Storm System Across the Eastern U.S.
A storm system will continue to produce widespread showers and thunderstorms as it progresses eastward across the central U.S. into the Northeast through the weekend. There are risks of severe thunderstorms and excessive rainfall on Saturday from the Ozarks into the mid-Mississippi River Valley with potential for damaging winds, large hail, tornadoes, and flash flooding. Read More >
| NWS Forecast for: Winthrop Harbor to Wilmette Harbor IL (LMZ740) Issued by: National Weather Service Chicago, IL Last Update: 247 PM CDT Fri Oct 17 2025 |  |
Tonight: South winds 15 to 25 kt. Chance of showers and slight chance of thunderstorms after midnight. Waves 2 to 4 ft. Saturday: Southwest winds 15 to 20 kt. Showers likely and a chance of thunderstorms in the morning, then chance of showers and slight chance of thunderstorms in the afternoon. Waves 1 to 3 ft. Saturday Night: South winds 10 to 15 kt becoming west and increasing to 20 to 25 kt overnight. Showers likely and a chance of thunderstorms in the evening, then showers and slight chance of thunderstorms overnight. Waves 1 to 2 ft building to 2 to 4 ft. Sunday: Northwest gales to 35 kt. Showers likely in the morning, then slight chance of showers in the afternoon. Waves quickly building to 4 to 7 ft occasionally to 9 ft. | |
| Zone Forecast: Winthrop Harbor to Wilmette Harbor IL (LMZ740) | |
Visit your local NWS office at: https://www.weather.gov/lot |