![]() ![]() “All of these ingredients came into place at the exact time that we were developing some very low-topped thunderstorms,” Gross said. ![]() There was a low pressure system in the area at the same time, causing increased wind shear. The skies started to clear in the early afternoon, causing the temperature to increase to around 50 degrees Fahrenheit in some areas. The tornadoes were caused by a combination of factors that are rare for this time of year, Gross said. It was rated EFU because its peak wind speed and path length and width are unknown. It was spotted north of Ely, and didn’t cause any observable damage, Gross said. The second tornado, observed by a storm chaser, touched down only briefly. It also blew a semi-trailer over on Interstate 80, according to NWS Meteorologist Tim Gross. The tornado caused minor damage to a cattle shelter and tree damage at a farmstead west of Highway 151. It was rated a 1, or EF1, on the Enhanced Fujita scale. Assistance from Iowa County Emergency Management in completing the survey is much appreciated." (Text and map image from National Weather Service event summary) The tornado was on the ground for roughly 8 minutes, along a path estimated at 4.7 miles. ![]() The tornado caused minor damage to a cattle shelter, and tree damage at a farmstead, before lifting near U.S. The tornado blew over a semi tractor trailer on I-80, then continued to the northeast. A tornado developed just northeast of Williamsburg, and south of Interstate 80. It traveled northeast for 4.7 miles, with a peak wind speed of 90 mph. The first tornado touched down two miles northeast of Williamsburg at 2:01 p.m. They were the first January tornadoes Iowa has seen in more than 50 years, according to the National Weather Service Quad Cities Office. Track lengths use polylines created in the NWS Damage Assessment Toolkit when available, which may be longer than the official Storm Data track (derived from start and end points only).Two tornadoes touched down in Iowa Monday afternoon. * Red entries indicate that the information is still under review Iowa tornado statistics for 2020 can be accessed here.Ĭlick each date for storm survey or event summaries (for select events) Fortunately, no injuries or deaths were observed with the tornado activity in 2020. 3 tornadoes were recorded in Marshall county with another one in Tama county and another in Linn county as the derecho plowed through the state. There was a relatively long break in activity from June 19th through all of July until several tornadoes touched down during the August 10th derecho. The next tornado occurred on June 18th when one weak tornado occurred in Kossuth county in a rural field with no damage. The strongest tornado of the day occurred south of Eagle Grove, resulting in significant tree damage and destroying a large machine shed. This tornado caused minor damage to a church before moving into open farmland. The next day brought seven more tornadoes, with another occurring in a suburb of Des Moines - this time in Waukee. While it went through a fairly populated area, nearly all reported damage was to trees and power line poles rather than homes and businesses. On May 25th, Memorial Day, a single tornado went through Johnston in the Des Moines metro. Five tornadoes occurred on May 23rd with the two strongest occurring to the southeast of Cedar Rapids. It would then be nearly two months before another tornado occurred in Iowa. Most damage was to trees and sheds or outbuildings, however in Oelwein multiple apartment buildings sustained significant damage. The 2020 tornado season kicked off on March 28th, with nine tornadoes across central and eastern Iowa. ![]()
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