Severe weather over northeast Illinois
Severe thunderstorms developed over northeast Illinois late in the afternoon on 9 August, and a series of tornadoes resulted. Storm Reports (from the Storm Prediction Center) are shown below. The mp4 animation above (click here for a large animated gif) shows 1-minute GOES-16 Mesoscale Sector 2 visible imagery (0.64 µm) from 1900 UTC on 9 August through 0040 UTC on 10 August. The active convection is apparent.
![](https://cimss.ssec.wisc.edu/satellite-blog/wp-content/uploads/sites/5/2021/08/SPCStormReports.png)
Part of the region hit by severe weather is in a persistent drought, as shown below (an image from this website). Rains that accompanied the severe weather provided some drought relief. (Click here for hourly CMORPH2 precipitation estimates from RealEarth)
![](https://cimss.ssec.wisc.edu/satellite-blog/wp-content/uploads/sites/5/2021/08/DroughtMonitor3August2021.png)
RCM3 (RADARSAT Constellation Mission 3) Synthetic Aperture Radar (SAR) winds from a 2340 UTC overpass on 9 August (from this site) show a wind feature over Lake Michigan associated with the convection. These wind estimates might be affected by ice within the glaciated clouds
![](https://cimss.ssec.wisc.edu/satellite-blog/wp-content/uploads/sites/5/2021/08/RCM3_SHUB_2021_08_09_23_40_00_0681867600_087.62W_43.27N_VV_C5_GFS05CDF_wind-911x1024.png)