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What is the rare ‘tsunami’ roll cloud phenomenon?

A terrifying cloud recently rolled over Portugal

What is the rare ‘tsunami’ roll cloud phenomenon?
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StarsInsider
10/07/2025 09:00 ‧ 8 hours ago | StarsInsider

LIFESTYLE

Weather

On June 29, 2025, Portugal witnessed a rare "tsunami" roll cloud. This strange and scary weather event caused a massive roll cloud to stretch over 93 miles (150 kilometers) of the coastline.

Resembling a giant tsunami wave, beachgoers were seen fleeing in panic, and as pictures began to circulate, curiosity spread as to what could cause such a meteorological spectacle and how dangerous it could be if it happened again.

So, click on to find out about this rare phenomenon.

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