River Summary, PAST WEATHER
Northern Illinois University meteorology professor Victor Gensini called the derecho one of the worst weather events in the U.S. in 2020. All NOAA.
Drone footage shared with NWS Chicago as well as satellite imagery revealed a narrow swath of corn flattened in a convergent pattern. The following images shows the progression from peak power outages on the morning of August 11 to the gradually and ongoing restoration on the mornings of the 12th, 14th, and 16th. News tips: 507-280-5125 Combined with sufficient low-level moisture and heating, this indicates explosive convection processes. The severe weather downed trees causing power outages in Des Moines in this neighborhood near SW 61st Street on Aug. 8, 2020. Please select one of the following: Several tornadic circulations developed within the main line of thunderstorms, and these accounted for 13 tornadoes across northern Illinois and northwest Indiana. All damage was to trees along the tornado path. A derecho produces a swath of particularly damaging thunderstorm winds (specifically, wind gusts of at least 58 mph along most of its length with several well-separated 75 mph or greater gusts) over an area at least 250 miles long. The Chicago Fire Department tweeted that downed power lines were causing "numerous fires" in the city.
Aug 10, 11 a.m. MCS maintenance parameter, which provides probabilistic information combining shear profile data, mid-level lapse rates, instability, and mid and upper level wind flow. Farmers in Iowa reported that some grain bins were destroyed and corn fields were flattened by the storm, and Iowa officials were assessing the total damage to its powerful agriculture industry. Tree damage consistent with winds around 95 mph occurred immediately northeast of I-90. Great Lakes Marine Portal
WARNINGS/HAZARDS In the village of Forreston, about 28 miles southwest of Rockford, officials said five people were taken to a hospital after the storm.
Courtesy of Jeff Wood. Straight-line winds accompanying a derecho storm ripped through central Iowa on Aug. 10, 2020, aking down trees and leaving at least 480,000 Iowans without power.
Courtesy, USDA major/minor corn areas with NWS storm reports overlaid shows the derecho swept through major corn producing areas of Iowa, Illinois and Indiana on August 10, 2020.
Briefing Page Weather Summary
The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories: Hazards
NWS Training Portal ", In a Twitter post, the City of Iowa City shared a video of significant tree damage caused by the storm and asked residents, "Please: do not be out on the roads unless necessary.". Courtesy Jeff Wood. Parts of Omaha had heavy damage, with downed trees littering roads and yards Monday morning. NOAA Weather Radio. This EF-1 tornado started on Harmony Road immediately southwest of I-90 near the McHenry/DeKalb County line. Hazardous Weather Outlook A swath of damaging winds consistent with speeds of 70 to 80 mph continued into Crest Hill based on prolific tree damage. Text Summary of Storm Reports - Issued August 10, 2020 at 316pm CDT, Tornado #1 - SW of La Moille Roof starting to blow off! Several large trees and power poles were snapped near their bases in this region, producing damage consistent with an EF-1 tornado. Courtesy of Lisa Schmitz. This was the first tornado in the city of Chicago since. The thing that makes derechos so devastating is how much larger the damage path is compared to a tornado.
Data are from USDA-NASS Maps and are shared by Brad Rippey from USDA-Office of the Chief Economist World Agricultural Outlook Board.
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