Speedy Updraft From The Speedway

Rapidly rising updrafts push the tops of the cumulonimbus cloud in this image to over 45,000 feet. A partially visible overshooting top can be seen in the upper right portion of the cloud. Overshooting tops form when the rapid momentum of an updraft breaks through the equilibrium level (anvil) in a cumulonimbus cloud and forms a dome-like structure above it. This view looks east along Interstate 80 about a half-mile west of the Iowa Speedway exit (Exit 168) in Newton, Iowa around 3:48 PM, Monday, May 28, 2012. The Memorial Day storm cell would become severe-warned.