The National Weather Service is calling Thursday night’s storms in the Northern Plains a derecho, which is a long duration wind event. “A derecho usually spans several miles,” said Kari Fleegel, meteorologist, National Weather Service. “There were lots of severe weather reports flowing in on Friday about the high winds. There are wind estimates from 60-to-80 miles-per-hour. In southeastern South Dakota, there were wind reports more than 100 miles-per-hour. We also had reports of a few tornadoes.” The high winds damaged buildings, trees and farm structures across eastern South Dakota, portions of southeastern North Dakota and Minnesota.
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