Aircraft landing in Chicago likely contributed to a burst of heavy snow as they flew above the waters of Lake Michigan on Tuesday.Flight tracking provided additional evidence that air traffic was a contributor to the formation of this localized pocket of snow. Planes arriving from the west made a looping turn over Lake Michigan while on approach into Chicago's O'Hare airport, a similar pattern to how the radar echoes appeared.
They concluded that aircraft propellers and wings cause the formation of those ice crystals. There are zones of locally low pressure along the wing and propeller tips which allow the air to expand and cool well below the original temperature of the cloud layer, forming ice crystals.
https://www.wunderground.com/news/news/news/2018-11-28-chicago-lake-michigan-airplanes-snow
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