The rare type of cloud, whose name is Latin for "roughness," was first observed in 2006 by an amateur cloudspotter in Iowa.

Weather watchers were treated to an exceptionally rare display on Friday evening as rare cloud formations filled Vancouver ...

Roll clouds are not and do not produce tornadoes. These are considered arcus clouds, like a shelf cloud. Shelf clouds are ...

A rare cloud formation called the Taieri Pet was seen over New Zealand. NASA's satellite captured an image of this cloud. The ...

opens new tab describes Undulatus Asperatus clouds as a rare cloud formation that appears dark and storm-like but tends to dissipate without a storm forming and that the name translates ...

A rare cloud formation, that creates an optical illusion tricking viewers into thinking it looks like a UFO, has been seen in Turkey. The wave-like pattern is known as a lenticular cloud.

Stunned sky-watchers in the US state of Wyoming have snapped photos of a rare cloud formation crashing across the horizon like ocean surf. "This was special and I immediately knew I needed to ...

A rare cloud formation that is sometimes confused with a UFO has been reappearing in the same spot in New Zealand for over 100 years. A recent NASA photograph showed the smooth white cuttlefish ...

The cloud formation, known as undulatus asperatus, was first proposed in 2009. This rare type of cloud typically forms below ...

Short-lived atmospheric phenomenon is known as a fluctus cloud formation, Hong Kong Observatory says in post capturing the ...

This is the spectacular moment a vibrant pink sunset illuminated the skies over the Philippines amid successive typhoons. Locals were in awe at the breathtakingly rare cloud formation above ...