Derecho with 100 mph winds moving across the Midwest

A very dangerous derecho is moving out of Iowa into northern Illinois, toward Chicago, prompting the SPC to issue a PDS thunderstorm watch through 7 p.m. central time Monday.

“PDS severe thunderstorm watches are rare, and reserved for only the strongest thunderstorm events,” CNN meteorologist Brandon Miller said. “Wind gusts are expected to reach up 100 mph with the line of thunderstorms as rolls across northern Illinois and southern Wisconsin.”

A wind gust of a 106 mph in Marshall, Iowa, has already been reported as this storm passed through.

A derecho producing widespread damaging winds, some of which should be intense, is expected to persist and expand east from Iowa into parts of the Midwest through this evening,” the Storm Prediction Center said Monday.

A derecho (pronounced similar to “deh-REY-cho”) is a widespread, long-lived wind storm associated with a band of rapidly moving showers or thunderstorms.

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

This storm complex is within the same area that is also under a moderate risk (level 4 of 5) for severe storms. The SPC upgraded this risk level Monday afternoon because of the formation of the derecho. The risk area includes over 13 million people.

In addition to wind damage, large hail — one and a half inches in diameter — is possible and a couple tornadoes possible.

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