Asperitas clouds are a distinctive, but relatively rare cloud formation that takes the appearance of rippling waves.

A viral video from 2022, showing a strange, dark cloud formation over Sydney, has resurfaced, sparking comparisons to dementors from Harry Potter. Despite the eerie appearance, experts have ...

A striking cloud formation, known as asperitas ... "They would come in every now and then from different places: Australia, from Greenland, from across the US, from Europe and here in the UK." ...