Snow Storms
radar data is used to identify bands of heavy snow

This image shows the different scales on which snow can occur. The large snow band extending across the figure is associated with a large storm system moving across the country.

Image by: NWS

Superimposed on the large system, is a smaller scale snow band located off the west shoreline of Lake Michigan. Each of these bands individually produced heavy snow and where they intersected near Chicago, the snow was particularly intense.

flash floods
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Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.