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Radar track of the derecho from August 10 at 2 a.m. CDT to August 11 at 4 a.m. CDT. The Storm Prediction Center (SPC) did not initially foresee an event of this magnitude, primarily due to sporadic model solutions, more specifically the large variance in intensity, location, and coverage of this derecho. [147]
August 2017 Middle Europe derecho series: 10–12 August 2017: 10–11 August: A strong mesoscale system formed in central Austria at about 10 pm on August 10. The storm crossed eastern Czechia and central Poland during the night and hit Warsaw at about 7 am on August 11. At least one person was dead because of storm wind gusts.
The straight-line wind storm, which produced severe wind damage across portions of eight Midwestern states on Aug. 10, 2020, is considered the most costly thunderstorm in U.S. history.
A warm-weather phenomenon, derechos mostly occur in summer, especially during June, July, and August in the Northern Hemisphere, or March, April, and May in the Southern Hemisphere, within areas of moderately strong instability and moderately strong vertical wind shear. However, derechos can occur at any time of the year.
A derecho is a significant, potentially destructive weather event that is characterized as having widespread, long-lived, straight-line winds associated with a fast-moving group of severe ...
On Aug. 10, 2020, an intense derecho produced a swath of high winds and leveled crops from eastern Nebraska to parts of Michigan and northern and central Indiana. The damage swath extended for ...
The overall derecho caused about $11 billion (2020 USD) in damage and thousands of power outages. August 15 – An EF1 anticyclonic fire tornado in California from the Loyalton Fire has a tornado warning issued by the National Weather Service, marking the first ever anticyclonic fire tornado to have a tornado warning issued for one.
A 20-month period from January 2020 to August 2021 recorded the least rainfall since 1895. [25] Lake Powell hit record low levels in July 2021, [26] [27] and due to Lake Mead dropping so low, water restrictions were imposed. [28] By mid-August 2021, Iowa was facing extreme drought. [29] [30] Drought also affected over 85% of Mexico. [31]