A persistent spreading contrail below altostratus, color reversed, Boulder CO, March 11, 2013 at 3:45 pm.

A persistent spreading contrail below altostratus, color reversed, Boulder CO, March 11, 2013 at 3:45 pm.

By Zachary Brunson for Spring 2013 Clouds 2.
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Kelvin-Helmholtz curls atop a stratocumulus. Boulder CO, 12:55 PM on March 8th, 2013.
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Cumulus fractus leading a front, Boulder CO, March 11, 4 pm.

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