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.

This is the moment a rare phenomenon was spotted at a beach in Portugal, as the country faces a heatwave with highs of 42C. Beachgoers on Sunday (29 June) were shocked when they saw a “roll cloud” coming out of the ocean and heading towards the shore.