Storm clouds in Byers, CO (DI01183), Photo by Carlye Calvin

Lenticular clouds from the Mesa Lab (DI01184) Photo by Carlye Calvin

Sunrise in the Outer Banks (DI01185) Photo by Carlye Calvin

Lenticular clouds (DI01186) Photo by Carlye Calvin

Kelvin-Helmholtz cloud (DI01175) Photo by Benjamin Foster

Kelvin-Helmholtz clouds (DI01442) Photo by Carlye Calvin

Stratocumulus clouds at sunset (DI01443) Photo by Carlye Calvin

Mammatus cloud (DI01444), Photo by Carlye Calvin

Mammatus cloud (DI01445) Photo by Carlye Calvin

Halo around the Sun (DI01448) Photo by Carlye Calvin

Silver lining around a dark cloud (DI01449) Photo by Carlye Calvin

Iridescence in wave clouds (DI01450) Photo by Carlye Calvin