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The 2009 U.S. event that prompted a new class of storm — super derecho

Sunday, May 8th 2022, 6:17 am - On this day in weather history, a derecho hit parts of the U.S. Midwest.

This Day In Weather History is a daily podcast by Chris Mei from The Weather Network, featuring stories about people, communities and events and how weather impacted them.


On Friday, May 8, 2009, an extreme derecho struck areas of Kansas, Mo., and Illinois.

The term "derecho" means "directionally straight" in Spanish. It's a straight-line, widespread and long-lived wind storm. Derechos can create heavy rain, hurricane-force winds, and tornadoes. This particular storm lasted 15 hours and 28 minutes, producing 39 tornadoes and killing six people.

The May 2009 derecho produced particularly strong winds that in 2010 a new class of storm was initiated -- the super derecho.

The storm created supercells that produced baseball-sized hail in southern Missouri. The Southern Illinois Airport measured wind gusts up to 171 km/h.

Business damage doniphan *"Damage to a business in downtown Doniphan, Mo. on May 8, 2009." Courtesy of Wikipedia*

Kansas and southwestern Missouri received heavy winds, as well. In Hutchinson, Kan., wind flipped over several planes at a local airport. In New Albany, Kan., a woman died when her mobile home was blown 40 feet from its foundation.

In Greene County, Mo., 346 buildings were damaged.

The worst of the confirmed tornadoes were two EF-3s, according to the Enhanced Fujita scale. One was in Howell, Mo. It travelled 3.5 km and destroyed two homes, two buildings and an auto shop. The twister blew cars 37 to 46 metres away from where they were parked.

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The other EF-3 hit Richmond, Ky., and travelled 35 km. This tornado also destroyed several homes and cars. It killed two people.

The derecho caused other damages like significant flooding in St. Louis, Mo., and widespread power outages in Illinois.

Madisoncotordamage *"Damage to home in a subdivision in Madison County, Ky., from an EF-3 tornado on May 8, 2009." Courtesy of Wikipedia*

President Barack Obama declared a major disaster for areas in Illinois. The State Emergency Management Agency of Missouri received $1,228,208.25 in federal grant money to cover the state's costs associate with managing the damage caused by the derecho. Other states received federal aid, as well.

To learn more about the May 2009 Midwest derecho, listen to today's episode of "This Day In Weather History."

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Thumbnail: "Picture of an EF-0 tornado north of Royalton, Ill., on May 8, 2009." Courtesy of Wikipedia

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