People saw a green-tinged sky as storms swept throughout the country. People in Sioux Falls, South Dakota, saw a unique sight Tuesday as storms rolled across the country: a green-tinged sky.
Meteorologists verified it was a “derecho” – a broad and long-lasting straight-line windstorm caused by a group of fast-moving severe thunderstorms. To be classified as such, the swath of wind damage must be more than 250 miles long, have wind gusts of at least 58 mph over the majority of its length, and have many wind gusts of at least 75 mph.
Winds were reported at 96 mph in Huron, South Dakota, and around 99 mph in Howard, South Dakota, on Tuesday. Grapefruit-sized hail has also been observed in Sioux, Nebraska.
On Wednesday, storms moved eastward and over the Mid-Atlantic, with a possible tornado flattening many buildings in Goshen, Ohio, and high winds from Colorado to Virginia.