To be classified as a derecho, a windstorm must have winds of at least 58 mph, some gusts over 75 mph and a wind damage path ...

The risk for severe weather is expected to peak this weekend as a new storm develops over the Mississippi Valley, strengthens and tracks toward the Great Lakes region. Some of the severe thunderstorms ...

Nine states across the southern Plains are under the threat of severe thunderstorms, with parts of Arkansas and Oklahoma, in particular, threatened by storms capable of generating a few tornadoes ...