A “roll cloud” spotted off the coast of Portugal looked like something out of a movie. Here’s the science behind it.

The dark, tsunami-like cloud formation billowed across parts of Portugal’s northern and central coasts, as the country set a ...

It resembles a giant wave rolling across the sky. Read more at straitstimes.com. Read more at straitstimes.com.

A dramatic “roll cloud“ spotted up and down the country’s central coast formed during a weeklong heat wave.

A rare and stunning roll cloud formation captivated beachgoers in Portugal, resembling a massive horizontal wave. The unusual ...

Portugal like much of Europe has been experiencing a heat wave in recent days, but another rare weather phenomenon also ...

People relaxing on Furadouro beach, south of the city of Porto, saw a huge cloud rolling in from over the ocean.

A rare roll cloud was seen passing over several beaches in Portugal on Sunday, June 29. The phenomenon features a cloud that ...

People in Portugal witnessed one of the most beautiful natural phenomena– after ‘roll clouds’ took over the ocean, turning it ...

A rare 'tsunami roll' appeared in the sky off the coast of northern Portugal on Sunday, 29 June, causing beachgoers to flee ...

A rare roll cloud stunned beachgoers in Portugal as it swept across the sky during a heatwave. Watch the breathtaking moment.

Check out this incredible roll cloud spotted off the coast of Portugal on Sunday. Roll clouds are most common with ...