An arcus cloud is a rather long bar or shelf which extends outward from the front side of the base of a well-organized thunderstorm. It's common name is a shelf cloud and it is caused by the ...
An arcus cloud glided over Portland, Maine, amid a severe thunderstorm warning on September 15. Dini Lamot was crossing Casco Bay on a ferry when he shot this footage of the shelf cloud. Lightning can ...
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