9/28/2023 0 Comments Rainfall totals map for des moinesNASA 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). If the Sunday rainfall forecast proves accurate, this February, which ends Tuesday, will be the wettest in central Iowa since 2019.Widespread, destructive straight line winds blew across central Iowa during the day on August 10, 2020. But so far, precipitation in 2023 has been slightly above normal, and the National Climate Prediction Center, an arm of the weather service, is calling for above-normal precipitation across central and eastern Iowa through May. It's far too early to say whether the rain represents a turnaround for Iowa after three droughty years. There's another chance of precipitation late Tuesday and on Wednesday. Gusty winds and thunder are expected along with the rain. The river gauge on the Racoon River at Fleur Drive near flood-prone Water Works Park forecasts the river's volume will more than double by the end of Monday, but remain within its banks. The weather service isn't forecasting flooding, though it warns it is possible in some northerly sections of the state where there is more snow on the ground ― snow that's melting Sunday as highs reach the upper 30s in northern Iowa and the low 50s in Des Moines and southern Iowa. More: Derechos, rare haboob in Iowa raise concerns: Is the Midwest headed to another Dust Bowl? Flooding not expected, but possible in north Sunday ― and continue until around midday Monday. In a slight deviation from its Saturday forecast, the weather service expects the precipitation to reach the Des Moines metro a little later ― about 8 p.m. The rain, part of a system that originated off the California coast and has brought heavy snow to higher elevations near Los Angeles, is expected to spread from southwest to northeast across Iowa. Rain to reach Des Moines metro Sunday evening Even at that level, it could be historic the forecast guidance Saturday noted there are only three two-day February rainfalls on record in Des Moines that reached or exceeded 1.75 inches. The forecast calls for up to 2 inches of rain ― and perhaps even more in isolated areas ― though forecast guidance says most of central Iowa could see a maximum of about 1.5 inches. Up to 2 inches possible in some locations Don't let the sunshine fool you: The National Weather Service is sticking by its forecast of heavy rain tonight, though it's made some adjustments in the timing.
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