Rare weather phenomenon grips Portugal beach during heatwave
Beachgoers on Sunday (29 June) were shocked when they saw a 'roll cloud' coming out of the ocean and heading towards the shore.
The dense tsunami-like cloud occurs when hot and cold air masses collide, forming a thick cloud that condenses into a curved-shape.
Climate expert Mário Marques said it is not the first time Portugal has experienced a roll cloud, but is more common to witness the phenomenon in somewhere like Australia, where cold air from Tasmania collides with hot air on the mainland.
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