Stratocumulus, Boulder CO, March 15th, 2013, 3:00 pm.

By Jon Horneber for Spring 2013 Clouds 2.
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Stratocumulus, Boulder CO, March 15th, 2013, 3:00 pm.

Stratocumulus below altostratus, Boulder CO, 2 pm on the 15th of March 2013.

Fluffy cumulus clouds contrasting with altocumulus undulatus gravity wave clouds above. Boulder CO, March 15th, 2013 at 1:47 pm.

Stratus and cumulus prior to a front, Boulder CO, March 15th, 2013, 1:00pm.

Mountain wave clouds in Boulder, CO, March 14, 2013, at 7:00 P.M.

Mountain wave clouds, Boulder CO, March 14, 2013 at 6:34 pm.

Altocumulus lenticularis, March 13th 2013, 6:20 pm, Boulder CO.

Cumulus fractus leading a front, Boulder CO, March 11, 4 pm.

A persistent spreading contrail below altostratus, color reversed, Boulder CO, March 11, 2013 at 3:45 pm.

Kelvin-Helmholtz curls atop a stratocumulus. Boulder CO, 12:55 PM on March 8th, 2013.