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Caption:
The rotating updraft base of a supercell thunderstorm is pictured against the setting sun in Climax, Kansas, US.
Credit: Stephen Locke/Barcroft Media, found at The Guardian.
[youtube https://www.youtube.com/watch?v=VoO89cqDgJU?feature=oembed&enablejsapi=1&origin=https://safe.txmblr.com&wmode=opaque&w=250&h=141]
An Incredible Time-Lapse Video of a Supercell Thunderstorm Forming Over Wyoming
(Source: https://www.youtube.com/)