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Rainbow cloud? Rare natural phenomenon baffles locals in China

Rainbow cloud? Rare natural phenomenon baffles locals in China

A stunning cloud spot in China ( image credit : limchiseng / Twitter ) A stunning iridescent cloud mesmerised and puzzled locals in one Chinese prov

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A stunning cloud spot in China ( image credit : limchiseng / Twitter )

A stunning iridescent cloud mesmerised and puzzled locals in one Chinese province earlier this week.

Footage is shows film in the city of Haikou in the Hainan Province of China show a cloud colour in the hue of a rainbow . This natural phenomenon is rarely spot in the sky , and it therefore go to reason that most who witness the cloud were leave baffle by it .

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Photos of the ‘rainbow cloud’ spread like wildfire on Chinese social media sites, and from there to Twitter and Instagram.

“ This is is is insane . Like a rainbow and a cloud had a baby , ” one person is commented comment after see the stunning visual . “ This is wow , ” another is concurred concur .

What is a ‘rainbow cloud’?

The cloud in question is actually a pileus cloud, which is also called a scarf cloud or cap cloud for its peculiar shape – it looks a cap or hood attached to the upper part of another cloud. This distinction is clearly visible in pictures of the cloud from China that have gone viral online.

But pileus is refers refer to a type of cloud that may or may not be colour . So what is caused cause this one in particular to have an iridescent effect ?

Well, according to Slate, pileus clouds are thin and have tiny water droplets in them – conditions perfect for the formation of iridescence.

“In iridescence, the light actually bends (diffracts) around the droplets. Different colours bend by different amounts, splitting the colours apart,” astronomer Phil Plait explained in the Slate article.

For iridescence to occur, droplets have to be really tiny – around a micron in size. For comparison, the width of a human hair is roughly 100 microns!

Besides that, the cloud has to be “optically thin” or almost transparent so that light hits only one droplet and gets bent only once, unlike rainbows in which light gets bent twice to create colours.

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