This causes the cloud to take on a beautiful wave-like appearance. Towering Kelvin-Helmholtz clouds over Montreal on Dec. 2, 2024. (Sebast Poulin/Submitted).

Sky-watchers were treated to a unique sight on Sunday evening as rare clouds developed west of Calgary, Alberta. DON'T MISS: Weirdest cloud in Canadian history? Here’s the explanation Kelvin ...

A woman in Calgary, Alberta, Canada, saw a strange, wavy cloud in the sky on Feb. 22, 2025, and took to X, formerly known as Twitter, to crowdsource an answer. "Does anyone know what is happening ...

The Met Office said: "Kelvin Helmholtz clouds, or fluctus clouds, are quite rare. "These clouds are more likely to be seen on windy days when there is a difference in density of the air.

Keep in mind, Kelvin-Helmholtz clouds are a type of formation, not type of clouds on their own. They tend to appear on these five cloud types: cirrus, altocumulus, cumulus, stratus, and stratocumulus.

Posted 2:37 a.m. Apr 28 - Updated 3:00 a.m. Apr 28 Kelvin-Helmholtz wave clouds in Cameron, NC - Photo taken by Martina Renaud By Chris Michaels , WRAL meteorologist ...

SEE ALSO: Rare clouds make a wave over Montreal The best chance of spotting Kelvin-Helmholtz clouds is on windy days during sunrise or sunset. At these times, the lower cloud layers tend to be cooler, ...

The Met Office said: "Kelvin Helmholtz clouds, or fluctus clouds, are quite rare. "These clouds are more likely to be seen on windy days when there is a difference in density of the air.

The Met Office said: "Kelvin Helmholtz clouds, or fluctus clouds, are quite rare. "These clouds are more likely to be seen on windy days when there is a difference in density of the air.