The lower clouds, including the predominant dark cloud, are Cumulus humilis. In the middle are weak Altocumulus undulatus with a lingering contrail and the upper most clouds are Cirrostratus fibratus. January 24 around 5 p.m, near the intersection of CO Hiwys 93 and 128.By James Shefchik for Spring 2013 Clouds 1.
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