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.