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Severe Storms Bring Tornado Risk and Flash Floods to Millions
Dangerous weather conditions expected across the Midwest and Great Lakes this weekend
Apr. 17, 2026 at 7:28pm
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A powerful storm system is set to bring a heightened risk of tornadoes, flooding, and damaging winds to millions of people across the Midwest and Great Lakes region this weekend. The National Weather Service has warned of the potential for violent storms, with the greatest tornado threat in Iowa, Wisconsin, and northern Illinois, while flash flooding is a major concern in northern Michigan, Wisconsin, Missouri, and Kansas.
Why it matters
Severe weather events like these can cause significant damage to homes, businesses, and infrastructure, as well as put lives at risk. The ability to accurately forecast and prepare for these storms is crucial for protecting communities and minimizing the impact.
The details
According to the Storm Prediction Center, 38 million people between North Texas and Michigan are at risk for severe weather on Friday. The greatest tornado risk will be concentrated in Iowa, Wisconsin, and northern Illinois, where violent storms are expected later today. Separately, severe thunderstorms are expected to affect roughly 12 million people in the Ohio Valley and eastern Great Lakes region. The National Weather Service has also warned of flooding from persistent rainfall and thunderstorms across northern Michigan, Wisconsin, western Missouri, and eastern Kansas.
- On Friday, the Storm Prediction Center has identified the Upper Mississippi Valley as having the best chance for strong tornadoes.
- Damaging winds are expected to develop across the Lower Missouri Valley into the Middle Mississippi Valley on Friday evening.
- Hourly rainfall rates of one to two inches are expected, raising the threat of flash flooding across the region.
The players
Storm Prediction Center
A division of the National Oceanic and Atmospheric Administration (NOAA) that provides forecasts and warnings for severe weather events.
National Weather Service
A government agency that is responsible for weather forecasting and issuing weather warnings in the United States.
Wisconsin Department of Health Services
The state agency responsible for public health and emergency preparedness in Wisconsin.
Cavalier Johnson
The mayor of Milwaukee, Wisconsin.
What they’re saying
“Communities are beginning cleanup efforts despite 'more severe weather on the way.'”
— Wisconsin Department of Health Services
“It was an overwhelming force of nature.”
— Cavalier Johnson, Mayor of Milwaukee
What’s next
The National Weather Service will continue to monitor the storm system and issue updates on the potential for severe weather, including any tornado watches or warnings, as well as flood alerts. Residents in the affected areas are advised to stay informed, have a plan in place, and be prepared to take shelter if necessary.
The takeaway
This severe weather event highlights the importance of robust weather forecasting and emergency preparedness systems, as well as the need for communities to be resilient in the face of increasingly extreme and unpredictable weather patterns driven by climate change.
