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

By Jeremy Parsons for Spring 2013 Clouds 1.
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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.

Mountain wave cloud, Boulder CO, February 18th 2013, 1:15 pm.

Stratocumulus, Boulder CO, 18th of February 2013 at 11:31 A.M.

Stratocumulus, Boulder CO, 7:00 AM on February 18th, 2013.

Kelvin Helmholtz waves, 6:30 a.m. on Monday February 18th, 2013, Lafayette, CO.