Wicked Winds In The Upper Midwest As Wild Thunderstorms Sweep Through

Ominous thunderstorms bear down on the Lewis and
Clark Marina in Yankton, South Dakota Monday
evening in this web cam grab. Violent storms
caused a lot of damage in parts of South Dakota,
Iowa and Minnesota Monday and Monday night.'

The expected big storms - a likely derecho - in the Upper Midwest developed, spreading hurricane-force gusts in parts of South Dakota and Iowa. 

Damage reports are just started coming in, so we don't know the extent of it. But I'm sure there are structures with roof damage, houses with trees into them, and widespread power outages.

A derecho is officially defined as a batch of intense thunderstorms that spread frequent gusts of 58 mph or more, causing damage along a path at least 240 miles long. 

This just happened, so I don't know whether this will be officially defined as a derecho. But it probably will be. Reports of damage and gusts of 60 mph or more were reported between Sioux Falls, South Dakota and at least Davenport, Iowa, and those two cities are about 340 miles apart as the crow flies.

NOAA's Storm Prediction Center will make a final determination as to whether last night's weather meets the derecho criteria.   

The complex of storms created some pretty incredible winds in the eastern half of South Dakota and through Iowa and parts of southern Minnesota.

Wind reports include 99 mph and 92 mph northeast of Sioux City, Iowa; 92 mph in Spencer, Iowa, 90 mph in Janesville, Iowa and 87 mph in Irene, South Dakota. 

Cedar Rapids, Iowa, had gusts to 83 mph. The city was ground zero for arguably the nation's worst derecho on record back in 2020 when wind gusts in Cedar Rapids reached an incredible 140 mph. Still, last night's storm had to be disheartening for a community trying to regrow its tree canopy from the storm five years ago.

Campers, some of them occupied, were blown over in north central Iowa, near the Buddy Holly Crash site.  At least 27,000 Iowans were without power last night.

In South Dakota, tree damage was widespread through much of the eastern part of the sate. A 200-foot tall cell tower collapsed in the town of Hudson.  The tower had carried signals for Verizon, AT&T, and T-Mobile. Companies were working on a temporary fix to return service to the area, according to the Sioux Falls Argus Leader. 

A second clump of storms that was part of the same system produced storms further north in Minnesota and Wisconsin. A storm gust of 76 mph was reported in Rochester, Minnesota. 

Although there won't be anything as widespread as last night, severe storms are still a good bet in a broad zone from Montana through parts of Wyoming, South Dakota, pretty much all of Nebraska and western Iowa through this evening. 

Video:

Before the likely derecho coalesced, a tornado formed in southern South Dakota. A lightning strike associated with the same storm resulting in this video of the fire and the tornado simultaneously. Click on this link to view, or if you see the image below, click on that.