Cirrus uncinus, Boulder, CO, 4 April 2013 at roughly 9:40 am.

Cirrus uncinus, Boulder, CO, 4 April 2013 at roughly 9:40 am.

By Ross Pitcairn for Spring 2013 Clouds 2.
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Cumulus and altostratus clouds seen from above near Fort Worth, TX, March 31, 2013, 2 pm.
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Boulder, CO, April 4 2013, 10:55 am.

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