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

By Daniel Lopez for Spring 2013 Clouds 2.
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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.

Stratocumulus, Broomfield CO, March 30th 2013 at 6:02 pm.

Cumulus below cirrus, between Cedar City, UT and Beaver, UT on March 30, 2013 at 11:27 am.

Stratocumulus, Denver CO, 8:03 pm, 3/29/2013.

The shadow of a contrail is projected upward on a cirrus cloud by the setting sun. Boulder CO, March 29th 2013 at 5:20 pm.