Tuesdays burst of heavy snow was likely caused by airplanes making landing in Chicago. According to an article on weather.com, flight tracking on Tuesday showed evidence of flights making a loop for landing over Lake Michigan in approximately the same spot where doppler radar picked up a pocket of snow and precipitation. In a process called inadvertent cloud seeding, planes descended for landing through water-laden clouds in temperatures below freezing. The airplanes caused the formation of ice and ice crystals to happen as they passed through altocumulus clouds. These formations are rare.
https://weather.com/news/news/2018-11-28-chicago-lake-michigan-airplanes-snow
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