Stunning Shelf Cloud Captured In Dorset

UnresolvedExternal shares a report from the BBC: A video showing a shelf cloud forming, ahead of a thunderstorm, has been captured in Dorset. The dramatic footage was filmed by Steve Coggins in Portland on Monday evening before a thunderstorm hit the south coast. BBC South weather presenter Alexis Green said: "It's shelf cloud -- a type of arcus cloud. They form on the leading edge of thunderstorms. Cool, sinking air from a storm cloud's downdraught spreads out across the land surface, with the leading edge called a gust front. This outflow cuts under warm air being drawn into the storm's updraft. As the lower and cooler air lifts the warm moist air, its water condenses, creating the shelf cloud."

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