A viral video from Portugal captures beachgoers reacting to a large, tsunami-like roll cloud approaching the shore. This cloud forms when cold air meets high temperatures. Portugal is experiencing a severe heatwave, with temperatures soaring to record levels, providing ideal conditions for the formation of such clouds. Roll clouds can extend hundreds of miles without moisture to produce rain and are striking yet harmless. Experts note that climate change will likely increase occurrences of roll clouds in the future.
"These clouds are spectacular. They look massive, like it goes on forever, but they look scarier than they really are."
"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."
"The heat wave contributed to the perfect conditions for the ominous, tsunami-like clouds."
"It is beautiful to watch. It's just like, for those who like race cars, the equivalent of driving a Ferrari."
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