Unlike the cyclonic winds that wrap around and up into a tornado, a derecho’s winds descend and spread outward, typically pushed by a powerful jet stream that feeds into the back of a thunderstorm complex.
“The vortex was one of the most distinctive ones of that size that I have ever seen,” said Stephen Corfidi, a meteorologist at the University of Oklahoma and derecho expert, in an email. The exception is Hurricane Laura, which struck Louisiana in late August and caused an estimated $14 billion in damage. Preparation now can prevent a bad day from becoming worse. Several derechos strike the United States in a typical year. The most important news stories of the day, curated by Post editors and delivered every morning. Aon released an initial damage estimate of $5 billion for the derecho, not yet including agricultural impacts. “To have a Midwest city endure [such] wind speeds, and also see such a devastating impact to a large volume of regional crops, is almost unbelievable,” Bowen said. U.S. derechos typically form along the north edge of a very hot, humid surface air mass with the approach of a strong upper-level impulse. Along with the wind itself, crops were thrashed by small hail — pea to penny size — that was propelled “like machine-gun fire,” Glisan said.
“Increases in aggregated or mean damages have been modest,” they said, “but evidence for a rightward skewing and tail fattening of the distributions is statistically significant and robust — with most pronounced increases in the largest percentiles (e.g., 95% and 99%), i.e., the catastrophic events.”.
“We’re going to see impacts 30 years from now from this storm.”. The term languished until it was revived in the 1980s by Robert Johns, now retired from the National Weather Service Storm Prediction Center.
The highest estimated gust, based on the partial destruction of an apartment complex in Cedar Rapids, was 140 mph. Iowa state climatologist Justin Glisan highlighted the scope of agricultural impacts in a September webinar. “We have a whole distribution of damages that we usually average to determine economic impacts … but it is the extreme events that cause the damages that are most difficult to deal with,” said co-author Francesca Chiaromonte, a professor of statistics at Pennsylvania State University, in a news release.
Severe thunderstorm and tornado watches and warnings, radar, and satellite loops for Washington State Department, WA Washington State Department, WA 98504 Severe Thunderstorm … The first to gain widespread public attention by that label tore from Illinois to the Mid-Atlantic on June 29, 2012. The term derecho (deh-REY-cho), which can mean “straight ahead” in Spanish, was first applied to these events in 1888 by Gustavus Hinrichs, a professor at the University of Iowa and the state’s first climatologist.
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