A rare natural spectacle amazed people in Bowling Green, Ohio on Tuesday. A so-called squall (also known as a roll cloud) graced the skies above the small town ahead of an approaching storm (see video above).
A roll cloud (entered in the International Cloud Atlas with the name Volutus, note) is a deep, horizontally oriented cloud in the shape of a roll that mainly occurs during thunderstorms and especially with gusts of wind – more rarely also with cold fronts.
Roller clouds “are low-flying, cylindrical clouds that rotate slowly around their own axis,” say UBIMET experts Julia Schöberl and Josef Lukas. Such showers are relatively rare to observe.
The English term roll cloud is used internationally, in German-speaking countries it is usually spoken of as gust roller and occasionally also as “turtle collar”.
Source: Krone
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