Formation of <a href="//commons.wikimedia.org/wiki/Mammatus_cloud" class="mw-redirect" title="Mammatus cloud">mammatus clouds</a> over the city of Regina Saskatchewan on 2012-06-26 following a severe storm warning and tornado watch.
<a href="//commons.wikimedia.org/w/index.php?title=User:Bizenya&amp;action=edit&amp;redlink=1" class="new" title="User:Bizenya (page does not exist)">Craig Lindsay</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>