Derecho with winds of 100 mph moving across the Midwest

08/11/2020 USA


A very dangerous derecho is moving from Iowa to northern Illinois, toward Chicago, prompting the SPC to issue a PDS thunderstorm via 7 a.m. central time Monday.

“PDS-serious thunderstorms are rare, and reserved for only the strongest thunderstorms,” ​​said CNN meteorologist Brandon Miller. “Wind gusts are expected to reach 100 km / h with the line of thunder rolling across northern Illinois and southern Wisconsin.”

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A 106 mph vine in Marshall, Iowa, has already been reported as this storm continued.

“A derecho that produces widespread damaging winds, some of which must be intense, is expected to continue this east of Iowa and expand into parts of the Midwest,” the Storm Prediction Center said Monday.

A derecho (pronounced “deh-REY-cho”) is a widespread, long-lived windstorm associated with a band of fast-moving storms like thunderstorms.

A derecho can produce destruction similar to that of a tornado, but the damage typically occurs in one direction along a relatively straight swaddle. The term “direct line damage to wind” is sometimes used to describe derecho damage, says the SPC.

This storm complex is in the same area that is also under moderate risk (level 4 of 5) for severe storms. The SPC upgraded this risk level Monday afternoon due to the formation of the derecho. The risk area includes more than 13 million people.

In addition to wind damage, large hail – one and a half inches in diameter – is possible and a few tornadoes are possible.

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