Altocumulus undulatus below altostratus, Boulder CO, April 5, 2013 near 4pm.

By Jeremy Parsons for Spring 2013 Clouds 2.
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Altocumulus undulatus below altostratus, Boulder CO, April 5, 2013 near 4pm.

Mountain wave clouds, 12pm, April 5, 2013, Boulder CO.

Stratocumulus clouds forming west of Moab, Utah, April 5, 2013 at 11:20 am.

Altostratus at Boulder Reservoir, April 5 2013, 6:27 am

Mountain wave clouds, Boulder, CO, April 4th 2013 at 4:00 pm.

Mountain wave clouds, April 4th, 2013, 3:32 pm, Lyons CO.

Boulder, CO, April 4 2013, 10:55 am.

Cirrus uncinus, Boulder, CO, 4 April 2013 at roughly 9:40 am.

Cumulus and altostratus clouds seen from above near Fort Worth, TX, March 31, 2013, 2 pm.

Cumulus below cirrostratus in moonlight, Hilton Head Island, South Carolina, 10:30pm on March 30th, 2013.