Usually before a storm and in the afternoon
http://en.wikipedia.org/wiki/File:Mammatus_Clouds_Over_Mountains.jpg
http://en.wikipedia.org/wiki/File:Mammatus_over_Altom%C3%BCnster.jpg
Clouds before a storm
http://earthsky.org/todays-image/northern-illinois-storm-clouds-on-june-30
National Geographic Photgraphy
http://www.fotobeginner.com/9624/2014-nat-geo-traveler-contest/
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