What is a roll cloud? It looks like a tsunami or a giant barreling wave marching from the horizon line toward the coastline, but it's just a cloud. Here's why, when, and how the Volutus forms.

It is very rare and looks like a giant barreling wave marching toward the coastline. Meet Volutus, the roll cloud.

#rollcloud #volutus #clouds #meteorology #environment

Nuvem rolo. O fenómeno raro a que se assistiu este domingo em Portugal Imagens captadas em vários locais do país foram partilhadas pela página de Facebook Meteo Trás os Montes. O fenómeno é comum no nordeste da Austrália, mas raro em Portugal.

In Portugal wurde an einigen Stränden am Sonntag ein seltenes Phänomen beobachtet: Eine #RollCloud, ganz nah am Wasser.
Der Fachbegriff für diese Wolkenform ist #Volutus: 🔗 cloudatlas.wmo.int/en/clouds-sp...
Hier der Bericht einer portugiesischen Zeitung: 🔗 observador.pt/2025/06/29/n...

Photo of a roll cloud (a long tube shape) above the sea, following the chalk cliffs at Bempton in Yorkshire. There is sunlight on the water but the sun itself is mostly hidden by other clouds.

Something calming to escape the madness. A roll cloud (volutus) at RSPB Bempton Cliffs. #RSPBBemptonCliffs #rollcloud #volutus #serenesky #BemptonCliffs #chalkcliffs