Severe Thunderstorms Threaten Chicago Lakefront

National Weather Service issues Special Marine Warning for high winds and dangerous waves

Apr. 3, 2026 at 4:04am

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A sweeping, atmospheric landscape painting depicting the Chicago skyline partially obscured by dramatic, swirling storm clouds and heavy rain, conveying the overwhelming power of an approaching severe weather system.The National Weather Service's warning of impending severe storms along the Chicago lakefront underscores the region's vulnerability to the unpredictable forces of nature.Chicago Today

The National Weather Service in Chicago has issued a Special Marine Warning for the nearshore waters and open waters along the Illinois lakefront, including the Chicago and Indiana harbors, due to severe thunderstorms capable of producing wind gusts over 50 knots and waves that could capsize small craft. The storms are moving east at 30 knots and are expected to impact the area through midnight.

Why it matters

Sudden high winds and large waves pose a serious threat to boaters, swimmers, and other recreational users of the Chicago lakefront, which is a popular destination for residents and tourists. The National Weather Service is urging people to avoid the water and seek safe shelter until the storms pass.

The details

According to radar, the severe thunderstorms are located along a line extending from 12 nautical miles south of Waukegan Harbor to Wilmette Harbor to 7 nautical miles southwest of Midway Airport. The storms are expected to impact areas like Montrose Harbor, Monroe Harbor, 31st Street Harbor, Burnham Harbor, Belmont Harbor, and others around 10:30 PM CDT. Hail up to 0.00 inches in diameter and wind gusts up to 50 knots are possible.

  • At 10:24 PM CDT, the severe thunderstorms were detected.
  • The storms are expected to impact the Chicago and Indiana harbors around 10:30 PM to 10:55 PM CDT.

The players

National Weather Service

The federal agency responsible for weather forecasting and issuing weather alerts and warnings.

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What’s next

The National Weather Service will continue to monitor the storms and provide updates as needed. Boaters and others near the lakefront should heed the warning and seek safe shelter until the storms pass.

The takeaway

This severe weather event highlights the importance of heeding weather warnings, especially for those enjoying outdoor activities near large bodies of water. Sudden high winds and waves can pose a serious threat to safety, and the National Weather Service's timely alerts allow people to take appropriate precautions.