The heavy rains both in Chicago and surrounding regions of the Midwest have led to rising rivers and widespread flooding.
Check out the transformation of the Mississippi and Illinois rivers between April 20 and April 5 in the imagery below (obtained from the MODIS instrument aboard NASA’s Aqua satellite):
NASA, which produced these images, offers this commentary:
In early April, some stretches of the Mississippi and Illinois rivers were confined to braided river channels. But by April 20, the water rose high enough to merge some channels and spill onto floodplains in multiple locations. Water generally appears lighter in color in the April 20 image, likely because of heavier loads of mud and sediment.
For more on the Midwest flooding, see: