A heart-shaped cloud above the setting sun
A circumhorizontal arc is an optical phenomenon - an ice-halo formed by the refraction of sun- or moonlight in plate-shaped ice crystals suspended in the atmosphere, typically in cirrus or cirrostratus clouds
Mammatus clouds in Nebraska. Mammatus, also known as mammatocumulus (meaning "mammary cloud"), is a meteorological term applied to a cellular pattern of pouches hanging underneath the base of a cloud
Purple clouds above Northern Scotland
Rainbow on water splash-like clouds above Nepal
The sky after a thunderstorm above Sichuan, China
The sky above East Lothian, Scotland
A thunderstorm in Nebraska
Rainbow on the clouds in China's Shanxi province
A foggy sunset above Ambleside, north-west of England