A Squall Line over the Okavango Delta, Botswana
The Cloud of the Month for February is Basil Stathoulis’s photograph of dramatic thunderstorms lined up across the vast expanse of Botswana’s Okavango Delta. When Cumulonimbus clouds become aligned like this, they are known as a ‘squall line’. It is a weather formation that can persist for many hours, producing fierce winds, hail, and even tornados. At the leading edge of the weather system, strong updrafts of air develop into new storm cells, starting as large Cumulus clouds before maturing into the Cumulonimbus storm clouds. These squall lines can stretch hundreds of miles, as they sweep across the terrain.
Photograph © Basil Stathoulis.