Severe Weather With Mammatus

Mammatus clouds dominate the northeast sky as seen from the parking lot at Noelridge Christian Church in Cedar Rapids, Iowa around 4:00 PM, Sunday, May 22, 2011. West-central Linn County, of which Cedar Rapids is a part of, was under a tornado warning that had expired earlier at 3:45 PM. Though no tornado sightings in Linn County were confirmed, severe weather produced a volatile sky of this nature. Mammatus extend from the base of the anvil of a cumulonimbus cloud and are produced by intense wind shear.