Pyrocumulonimbus clouds forming near Colorado fires

As seen by GOES-15 (left panels) and GOES-13 (right panels) 0.63 µm visible channel and 3.9 µm shortwave IR channel images on 21-22 June 2013 at 15:00 - 02:02 UTC. Produced by the Space Science and Engineering Center, University of Wisconsin-Madison with funding from National Aeronautics and Space Administration (NASA); 22 seconds; silent.