Roll clouds are highly dynamic, typically formed along advancing weather fronts. On this particular afternoon, a cold front approaching Sydney brought cooler air surging beneath warm, moist summer ...

According to the meteorologist, roll clouds are rare in Germany but do occur. “Especially along the coast, such as near Rostock or on the North Sea islands, they can appear under certain weather ...

Wave Riders Roll clouds can stretch to lengths of hundreds of miles, and tend to appear when there's not enough moisture in the air to trigger a rain or thunderstorm. Parts of Portugal are in the ...

After its formation, the roll cloud was unable to move inland “due to high temperatures” on the surface of the water, and so “it looks like a wave that’s stopped, always breaking on the ...

So, it was even bigger!" The roll cloud allegedly stretched more than 90 miles along Portugal’s coast, with sightings reported from Vila do Conde to Figueira da Foz, according to local outlets.

NEED TO KNOW A rare phenomenon called a "roll cloud" covered Portugal beaches on Sunday, June 29 The tsunami-like formation shocked beachgoers, many of whom filmed the moment Scientists say the cloud ...