VIDEO: ‘Dust devil’ tornado in US

A sandy tornado, known as a ‘dust devil’, has been caught on camera in northern California.

The phenomenon is formed when hot air near the surface rises quickly through a pocket of cool low-pressure air which can rotate and stretch vertically.

Article source: http://www.bbc.co.uk/news/world-us-canada-24150374#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa

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