Stratocumulus, Boulder CO, 21st March, 2013 at approximately 7:40AM.

By Andrew Locke for Spring 2013 Clouds 2.
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Stratocumulus, Boulder CO, 21st March, 2013 at approximately 7:40AM.

Mountain wave clouds, Boulder, CO, March 20th, 2013 at 2:22 pm.

Altocumulus, March 19, 2 pm, somewhere between Denver and Las Vegas NV.

Mountain wave cloud, Boulder CO, March 15th 2013 at 4:15 pm.

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.