A rare and stunning roll cloud formation captivated beachgoers in Portugal, resembling a massive horizontal wave. The unusual atmospheric phenomenon, preceded by strong winds, rolled across the sky, astonishing both residents and tourists.

A dramatic video showing a "roll cloud" over a beach in Portugal is going viral on social media, leaving netizens mesmerised.

A record-breaking roll cloud, described as a massive ocean wave, rolled over the Atlantic during a heatwave in Portugal and Western Europe. The unusual phenomenon, which occurs when hot, dry air meets cooler sea breezes,