The National Weather Service in Sioux Falls has confirmed a tornado in Lyon County, Iowa, that occurred during Monday's ...

While two derechos in less than two months is extremely unusual for South Dakota, experts say it's just that — a fluke.

Severe storms overnight in Iowa caused fallen trees and downed power lines. See storm damage reports from across the state.

A 2020 derecho caused widespread damage across Massachusetts and southern New England. What to know about these destructive storms.

The National Weather Service in Sioux Falls has confirmed a tornado in Lyon County, Iowa, that occurred during Monday's ...

The thunderstorm risk level went from enhanced to moderate for the area, with timing now pushed back to between 5 p.m. and 1 ...

A dangerous derecho is expected to form in parts of the Northern Plains and Upper Midwest on Monday, with wind gusts over 75 ...

To be called a derecho, the thunderstorm-generated high winds and wind damage should cover a distance of at least 250 miles ...

Potent storms were hitting the northern U.S. on Monday, with a potential to turn into a derecho with hurricane-force winds.

Monday’s storm system produced two tornadoes in Gregory County and a third near Alvord, Iowa, in Lyon County, the National ...

The severe thunderstorms that passed through eastern South Dakota on July 28 brought powerful winds to the region.