Cumulus below altostratus undulatus Monday, April 7, 2014 at approximately 3:15 p.m..

By Philip Latiff for Spring 2014 Clouds Second.
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Cumulus below altostratus undulatus Monday, April 7, 2014 at approximately 3:15 p.m..

Stratus and stratocumulus, Monday April 7 around 1:00 pm, Boulder CO.

Mountain wave clouds on a bluebird day, Beuna Vista, CO, April 6th 2014 at about 6 pm.

Stratocumulus, April 6, 2014, 3 pm, Boulder CO

Stratocumulus, 06th April 2014, 12:12 pm, Boulder CO.

Cumulus congestus, April 6, 2014, Boulder CO.

Cumulus castellanus, near Curacao, Venezuela, April 5th 2014 , 1 pm.

Cumulus humilis, Thursday, April 3rd at 5:36 pm, Erie, CO.

Time lapse of mountain wave clouds, April 2 and 3, near Boulder CO. Video sped up between 50 and 100 times.

Altocumulus time lapse at 10 fps, March 31, 2014, Boulder CO.