Laurel Swift

Contrails involve jet engine exhaust drawn into trailing wing tip vortices. The long vortices then pinch off into loops and break down.

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Rick Silva

Cumulonimbus over Tokyo, viewed from 30,000 feet. 11/6/2004.

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Adrien Robert

Cumulonimbus over southwest Colorado, plus cirrus, possibly cumuliform.

Sascha Huges-Cayley

Cumulus clouds over the SF Bay area, 11/04. Slide film was cross-processed with C-41.

Josh Grages

Contrail over Boulder,CO, 11/15/04.

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Eric Larson

Cumulus clouds, looking north from Pikes Peak.

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Clay Corbett

Jen Masini

Cumulus.

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Bronwyn Hayworth

Mountain wave clouds over Flagstaff Mtn, Boulder CO, 6pm, 10/14/04.

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Katina Butler

Mountain wave, or altolenticulus undulatus dissipating to individual altocumulus clouds. Boulder CO, 6:30pm, 10/14/04.

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Chris Fauble

Dissipating lenticular wave clouds, Boulder CO, 6:30pm, 10/14/04.

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David Harbaugh

Altocumulus stratiformis undulatus. 6pm, 11/6/04, Superior, CO.

Matt Weber

Altocumulus stratiformus in the form of a cellular clump. It is a midlevel cloud consisting of thin flat layers broken up into distinct elements. 11/5/04, Boulder CO.

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Aaron Brown

Cumulus over the Indian Peaks, CO, 7/4/04.

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Chris Wilke

Cumulus, sunset, 10/14/04, from NCAR in Boulder, CO.

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Lindsey Wohlman

Stratocumulus, 8/30/05, 8:40 pm, Boulder, CO

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Karl Hausmann