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Rare 'tsunami' roll cloud phenomenon surprises beachgoers in Portugal

PORTUGAL, JUN 29 – A massive 150-kilometer roll cloud formed due to contrasting air temperatures during Portugal’s heatwave, causing alarm but no danger, meteorologists said.

  • A rare "tsunami" roll cloud appeared in Portugal, surprising beachgoers and locals on a recent Sunday.
  • The roll cloud, described as sitting low in the sky and taking a tube-shaped form, is considered "relatively rare" by the National Weather Service and often associated with thunderstorms.
  • Temperatures in Portugal reached over 107°F, causing the National Civil Protection Authority to issue warnings about rural fire dangers in various regions due to severe heat.
  • Videos of the phenomenon went viral, gathering over 20,000 views, with beachgoers sharing their experiences on social media.
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Extreme heat continues to grip Europe, and Portugal recently set a new record for June. In Mora, about ten kilometers east of Lisbon, the highest temperature was 46.6 degrees. But beachgoers trying to cool off on the northern and central coast of Portugal experienced a different weather phenomenon: A dark cloud stretched across the horizon, despite...

·Stockholm, Sweden
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A huge, roll-shaped cloud that rolled towards the coast was observed on Sunday in Portugal: as a meteorologist explains the weather phenomenon.

·Munich, Germany
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A natural phenomenon causes panic on a beach in Portugal – many think it's a tsunami. However, according to one expert, there is something else behind it.

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O Minho broke the news in on Sunday, June 29, 2025.
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