# Widespread severe weather and flooding across the U.S

> Live situation record from CLSTR: https://clstr.news/situations/severe-weather-in-central-ohio
> Updated: 2026-08-15T18:10:00.000Z. Sources: 8. Developments: 2.

Severe weather conditions have been forecast for central Ohio, characterized by the potential for brief tornadoes and heavy rainfall. The Storm Prediction Center noted a miniature supercell over Champaign County that may produce intermittent low-level rotation.

In the Columbus area, a flood watch is in effect because of saturated ground and the possibility of several inches of rain from repeated thunderstorm rounds. Forecasters have identified damaging wind gusts as a primary concern, though increasing wind shear could support isolated tornadoes. Storm activity is expected to continue through the weekend.

This period of instability has expanded into widespread severe weather across the United States. In the Midwest, a powerful derecho produced wind gusts reaching up to 99 mph in Portage, Indiana, and caused significant damage in the Chicago area, where the National Weather Service confirmed at least three tornadoes. 

In Colorado, a flash flood emergency was issued for the Middle and Squirrel Creek drainages, while severe thunderstorm watches were active for eastern Colorado and western Kansas. Forecasts indicate continued instability across the central and eastern U.S., with the Plains and Mississippi Valley facing risks of large hail, damaging winds, and tornadoes. Additionally, the Mid-South faces potential wind gusts of 60-70 mph and hail up to 2 inches.

## Claims

- At least three tornadoes touched down in the Chicago area. (corroborated by 2 sources)
- A derecho in Portage, Indiana, produced wind gusts of up to 99 mph. (corroborated by 2 sources)
- Severe Thunderstorm Watch 587 is in effect for eastern Colorado and western Kansas. (single source)
- A flash flood emergency is in effect for Middle and Squirrel Creek drainages in Colorado. (single source)
- A slight risk of severe thunderstorms is forecast for parts of the Plains and Mississippi Valley. (single source)
- Severe storms in the Mid-South may produce wind gusts between 60 and 70 mph. (single source)

## Timeline

### 2026-08-15: United States faces widespread severe weather and flooding

Severe weather is impacting the U.S., including a derecho in Indiana with 99 mph winds, tornadoes in Chicago, and flash flood emergencies in Colorado, with more storms forecast for the central U.S.

8 sources. https://clstr.news/cluster/severe-storms-and-tornado-threats-forecast-for-central-ohio

### 2026-07-31: Heavy Rain and Flood Risk Expected in Central Indiana This Weekend

Central Indiana faces up to 2 inches of rain Saturday, raising flood risk in Indianapolis and nearby cities, with thunderstorms possible but no widespread severe weather.

3 sources. https://clstr.news/cluster/heavy-rain-and-flood-risk-expected-in-central-indiana-this-weekend

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Cite as: Widespread severe weather and flooding across the U.S. CLSTR, https://clstr.news/situations/severe-weather-in-central-ohio