Rare natural spectacle
Gust roller causes amazement in small US town
A rare natural spectacle caused amazement in Bowling Green in the US state of Ohio on Tuesday. In front of an approaching storm, a so-called roll cloud adorned the sky above the small town (see video above).
A roll cloud (registered in the International Cloud Atlas with the name Volutus, note) is a low, horizontally oriented cloud in the form of a roll, which mainly occurs in connection with thunderstorms and in particular with gust fronts - more rarely also with cold fronts.
Roll clouds "are low-flying, cylindrical clouds that rotate slowly around their own axis," say UBIMET experts Julia Schöberl and Josef Lukas. Such gust rollers are relatively rare to observe.
The English term "roll cloud" is used internationally; in German-speaking countries it is usually referred to as "Böenwalze" and occasionally also as "Rollkragen".
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