Cumulous Clouds (DI02642), Photograph by Carlye Calvin

Sunrise in the Bahama Islands (DI02638), Photo by Carlye Calvin

Cumulonimbus over Mitchell Lake on the day of the Big Thompson flood, 1976 (DI02637) Photo by Bob Maddox

Dramatic November sunset (DI02548) Photo by Carlye Calvin

Dramatic November sunset (DI02547) Photo by Carlye Calvin

Dramatic November sunset (DI02546) Photo by Carlye Calvin

Lenticular clouds (DI02538)

Barker Reservoir with low-lying cloud (DI02535) Photo by Carlye Calvin

Cumulus at sunset (DI02510) Photo by Carlye Calvin

Colorado sunset (DI02509) Photo by Carlye Calvin

Mountain wave clouds (DI02408)

Cirrocumulus clouds? (DI02407) Photo by Carlye Calvin