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Tornados revealed to accompany derecho

T-R file photo A sign is knocked down on Main Street following the Aug. 10 derecho. Satellite and aerial footage reveals the derecho brought four tornados to Central Iowa.

Satellite and aerial footage reveals the derecho brought four tornados to Central Iowa.

On Aug. 10 three tornadoes touched down in Marshall County during the derecho, and one touched down in Tama County. The tornadoes primarily caused damage to crops in rural areas.

“(Tornadoes) can sometimes happen,” said Jeff Zogg, National Weather Service meteorologist. “The big thing with the derecho is the winds that can cause a lot of damage. You can sometimes have some spin up tornadoes.

In Marshall County one tornado touched down near Melbourne and two near Albion.

The four tornadoes were the only ones confirmed in Iowa during the derecho.

The tornadoes are estimated to be EF-0 or undefined levels because there were no damage indicators to rate the tornadoes.

“They’re not out of the ordinary,” Zogg said.

The tornadoes happened at the same time as the derecho and accompanied the storm’s winds.

“With the different wind directions, as the winds are coming out of the storm you can have a spin up tornado inside of the storm. They’re pretty weak. The big thing with the derecho is the wind itself.”

The tornadoes were not shown to cause any additional structural damage.

“One damaged some crops and trees,” Zogg said.

Derechos are not unusual on their own, but the high speed winds with accompanying tornadoes.

“To be this strong is unusual,” Zogg said. “It was a very strong (derecho).”

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Contact Thomas Nelson at 641-753-6611 or tnelson@timesrepublican.com

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