The flowers bloom in the Atacama Desert, Chile, in years when rainfall is unusually high. Normally the region receives less than 12mm of rain annually.
Misleadingly known as fire rainbows, this is an optical phenomenon featuring an ice halo formed by plate-shaped ice crystals in high level cirrus clouds.
Lenticular clouds over Mount Olympus
Stationary lens-shaped clouds form in the troposphere. Because of their shape, they have been offered as an explanation for some UFO sightings.
Also known as mammary clouds or mammatus clouds, the clouds show a rare pattern of pouches hanging underneath the base.
Polar stratospheric clouds
These are also known as nacreous clouds (from nacre, or mother of pearl, due to their iridescence).
Undulatus asperatus aka “roughened or agitated waves”
This cloud formation has been proposed as a separate cloud classification by the founder of the Cloud Appreciation Society and would be the first new type of cloud recognised since 1951.
Lake Natron in Tanzania