Head in the clouds.

Today's evening ride home contained a special treat ... Mammatus clouds.

While associated with thunderstorms, Mammatus clouds are not necessarily an indicator of severe weather. Mammatus results from the sinking of moist air into dry air.


It is in essence an upside down cloud.


The sharp boundary of Mammatus is much like the sharp boundary of a rising cumulonimbus cloud before an anvil has formed.

More from NOAA can be found here.