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.

Todd Heitkamp, a National Weather Service meteorologist, said the line of storms appeared to coalesce into a derecho around.

Thousands were without power and damage was seen across the Siouxland area after storms moved into the area on Monday, July ...

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

Severe thunderstorms are expected to hit eastern South Dakota in the late afternoon July 28, potentially bringing hurricane-force winds to the region.

Jeff Chapman, a meteorologist with the National Weather Service in Sioux Falls, said thunderstorms and strong winds between ...

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

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

Violent thunderstorms with hurricane-force wind gusts roared across the northern Plains and upper Midwest overnight, downing ...

The National Weather Service has preliminarily classified overnight storms from the Upper Plains to the Midwest as a derecho.