![]() Each line represents 30 minutes of time from left to right and goes from 7am at the top of the image to 7pm at the bottom of the image. The IGS' Jason Vogelgesang says, "You can see the waveform responding to the immense wind, beginning at 10:26am & fading back to normal background conditions at 12:08pm". Iowa Geological Survey's (IGS) real-time seismometer near Des Moines, IA captured the derecho as it moved through the metro. Power outages caused as the derecho moved through Iowa into Indiana on August 10, 2020. Total customers Affected: Over 1.9 Million Max customers out at one time: 1.4 million Image courtesy NWS Chicago ( original).ĭerecho's path across the region on Augwas over 750 miles! Image courtesy NWS Storm Prediction Center ( original). Hourly radar images of the derecho's progression across the region. This drop in Iowa is a result of both the ongoing drought and the derecho. Data are from USDA-NASS Maps and are shared by Brad Rippey from USDA-Office of the Chief Economist World Agricultural Outlook Board. Toggle between August 2, 16, showing a drop in the USDA Good to Excellent Soybean Condition in Iowa. Toggle between August 2, 16, showing a drop in the USDA Good to Excellent Corn Condition in Iowa. Courtesy of the USDA Weekly Weather and Crop Bulletin - August 18, 2020. 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. Not all nights were cloudless so 'blurring' of lights may occur in some areas. 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. The loop starts on the morning of Augbefore the derecho as a reference of nighttime lights in Iowa. NASA/NOAA Suomi Visible Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band showing the nighttime lights in Iowa. NASA TERRA satellite MODIS imagery toggle between Jand Augshowing the approximate damage to cropland (outlined) from the derecho that moved across Iowa on August 10, 2020. Imagery courtesy MODIS Today at University of Wisconsin-Madison Space Science and Engineering Center. Imagery courtesy MODIS Today at University of Wisconsin-Madison Space Science and Engineering Center. ![]() NASA Aqua satellite MODIS imagery toggle between Jand Augshowing the approximate damage area to cropland (outlined) from the derecho that moved across Iowa on August 10, 2020. Image courtesy of the Iowa Environmental Mesonet. Iowa Environmental Mesonet (IEM) feature showing AugAqua MODIS satellite image showing crop damage (smiliar to above) with wind reports overlaid. Thanks to Scott Lincoln, WFO Chicago for working with numerous offices to gather and refine this regional map. This is a collaborative effort between weather forecast offices Des Moines, IA Sioux Falls, SD Omaha, NE, Quad Cities, IA/IL, La Crosse, WI, Milwaukee, WI, Chicago, IL, central Illinois, IL, northern Indiana, IN, Indianapolis, IN, northern Indiana, IN, and Grand Rapids, MI. Preliminary map above shows the estimated wind speeds of the Augderecho across the region as of August 21, 2020. KMZ available here - this is preliminary and subject to change. There were to distinct locations of 100+mph winds with the area near Cedar Rapids estimating gusts of 120+mph! This map combines both NWS Des Moines and NWS Quad Cities service areas. Preliminary map of the estimated winds across central to eastern Iowa. Overview images of the swath of damage and power outages from the derecho and the progression of the derecho on Monday, August 10, 2020. Courtesy of Kip LadageĬorn damaged near Adel. ![]() Wind Gusts Greater than 70 mph in NWS Des Moines' area of responsibility Location NWS Central Illinois | NWS Northern Indiana | NWS Indianapolis NWS Quad Cities | NWS Chicago | NWS Milwaukee The strongest winds were between the Highway 30 and Interstate 80 corridor (including, but not limited to the Des Moines metro, Ames, Newton, Marshalltown, Tama/Toledo, Carroll) from central Iowa eastward into east central Iowa and northern Illinois. The highest official wind gusts measured was 99 mph at the Marshalltown Airport with an unofficial wind gust of 106 mph at Le Grand (east of Marshalltown). ![]() Widespread, destructive straight line winds blew across central Iowa during the day on August 10, 2020. ![]()
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