Mountain wave clouds, February 20 at 2:12 pm in Boulder, Colorado.

By Gage Henrich for Spring 2013 Clouds 1.
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Mountain wave clouds, February 20 at 2:12 pm in Boulder, Colorado.

Cirrus and cumulus clouds, February 19, 2013 at 5:15 pm, Boulder CO.

Mountain wave clouds, Boulder CO, January 19, 2013 at 5 pm.

Cirrocumulus, Feb 19, 2013, 3:30 pm, Boulder CO.

Cirrus clouds above altocumulus lenticularis clouds. February 19, 2013 near 2pm MST.

Cirrostratus fibratus, Boulder CO, 19th February, 2013 at approximately 1:50PM

Cirrus and altocumulus, February 19th, at 12:24, 2013 in Boulder, Colorado

A waxing gibbous moon shines through altostratus translucidus clouds, Boulder CO, February 19, 2013 at about 12:30 am

Cirrus fibratus, Boulder, CO on February 18, 2013 at 5:30pm.

Mountain wave clouds, February 18th 2013 at 2:20 PM, Boulder CO.