Altocumulus undulatus, 5:30PM on September 22, 2015 in Boulder, Colorado,

Altocumulus undulatus, 5:30PM on September 22, 2015 in Boulder, Colorado,

By Stefan Schultz for Fall 2015 Clouds First.
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Orographic altocumulus stratiformis perlucidus, Boulder CO, 6:18 PM on September 22, 2015

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