Altocumulus undulatus, Fillmore, UT, March 21, 2014 at 7:28 AM.

By Brian Kazar for Spring 2014 Clouds Second.
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Altocumulus undulatus, Fillmore, UT, March 21, 2014 at 7:28 AM.

Stratus clouds, Boulder CO, March 19, 2014 around 6:30 pm.

Altocumulus, Boulder CO, 7:19pm on March, 19th.

Altostratus undulatus duplicatus, 3:45PM on March 17, 2014 in Boulder, Colorado.

Stratocumulus on the bottom, and altostratus lenticularis on the top, near Idaho Springs, CO, 3/15/14 at 7:20 am.

Mountain wave cloud, March 10, 2014 at approximately 8:45am, Boulder CO.

Mountain wave clouds time lapse (2 and 4 fps), March 9 and 10 at sunset.

Cumulus, March 3 around 1 Pm, Boulder CO.

Nimbostratus, March 3rd, 2014 at 7:30 AM, Highlands Ranch CO.

Altostratus, March 2nd 2014 5:45 PM MST, Boulder CO