Cumulus and altocumulus, Oct.5th, 2015 at 2 p.m. in Boulder CO.

By Yusen Ji for Fall 2015 Clouds First.
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Cumulus and altocumulus, Oct.5th, 2015 at 2 p.m. in Boulder CO.

Cumulus at Mirror Pond, near Hunter Peak and Conundrum hot springs, Aspen Colorado, October 5th, 2015 at 10:18 am.

Stratocumulus, Boulder CO, Oct 4, 2015, 4 pm.

Cumulus, Independence Pass, outside Aspen, CO, October 4, 2015 at approximately 2:15 PM.

Altocumulus, October 4, 2015 at approximately 2pm in Aspen, CO.

Fog on Flagstaff Mountain, Boulder CO, October 4, 2015, 1 pm.

Stratocumulus, Boulder, CO, October 4th, 2015, at 10:52 am

Cumulus congestus, Broomfield, Colorado at 5:30 pm on October 3rd, 2015

Stratocumulus, Superior, CO Oct. 3rd 2015 3:35 PM

Cumulus, at Ashcroft, a small ghost town 10 miles south of Aspen, Colorado on October 3rd, 2015 at 2:23pm