A dramatic weather phenomenon took place along Portugal's coast this week as a rare roll cloud appeared above popular beaches, mesmerizing beachgoers and social media viewers. The rare meteorological phenomenon occurred as the country struggles through a severe heatwave, causing unstable weather phenomena throughout the region.

What Is A Roll Cloud?

A roll cloud is a low, horizontal, tube-like variety of arcus cloud. Visually striking, it seems to "roll" around a horizontal axis and is frequently observed near the forward edge of storm fronts. While vertically developed storm clouds advance horizontally, roll clouds travel horizontally and may extend several kilometres in length. They generally occur when cool air flows below warmer, moist air and produces a dramatic, wavy appearance.

A video clip of the roll cloud rolling along a beach in Portugal went viral on social media within hours, with over 20,000 views. The video captures a thick, tube-shaped cloud moving from the sea towards the shore, with gusts of strong wind that surprised beachgoers. Netizens were amazed at the sight. One said, "Holy canoly! Is this the storm front that will cool down Europe?" Another observed, "These used to be common in Northern Portugal decades ago, but have disappeared until now."

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Heatwave Triggers Unstable Weather Conditions

The unusual roll cloud was seen on Monday, even as Portugal struggled with a fierce heatwave. EuroNews reports that the severe heatwave during the weekend triggered a series of unusual meteorological phenomena, such as sudden showers, torrential storms, and hailstorms, primarily in the interior regions of the country. The Portuguese Civil Protection Authority has also released high notices, advising of a 'Very High' to 'Maximum' danger of rural fires within the North, Centre, and Algarve areas. People have been alerted to be cautious as temperatures are likely to rise even more this week.

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Meteorologists clarified that although roll clouds resemble giant ocean waves, they are not related to tsunamis or oceanic phenomena. Instead, they are purely atmospheric and pose no direct threat beyond strong winds and sudden weather changes.