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

The thunderstorms on July 28 produced two damage-causing tornadoes in South Dakota, and a third in Iowa, according to the National Weather Service.

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

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

The last time a derecho hit eastern South Dakota, the sky above Sioux Falls turned green, prompting Reddit users to create images of everything from Cthulhu to the Stay-Puft Marshmallow Man rampaging ...

A moderate threat for severe storms is in place for parts of South Dakota and Minnesota on Monday afternoon into the evening due to the threat of a derecho.

Much of eastern South Dakota continues to be in a hazardous weather outlook on Tuesday, with a 40 percent chance of showers ...

BREAKING: Parts of South Dakota face a dangerous weather situation today as conditions favor the development of a derecho - a ...

Barns were collapsed and a cell tower tipped over in Lincoln County, a result of two strong storm cells that swept the Sioux ...

Severe Thunderstorm Watch is in effect for Sioux Falls and surrounding areas, with wind gusts up to 70 mph and large hail ...

Heat advisories have already been issued for Saturday for counties west of Sioux Falls. The heat index is expected to reach ...

A Heat Advisory is in effect for eastern South Dakota today, with temperatures soaring into the 90s and humidity pushing the ...