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A photo of the sky in Japan has recently taken Twitter by storm, with many commenters marvelling at the extraordinary sight.

雲がすごい pic.twitter.com/ivYkTZBloD

— ℕ𝕖𝕚ℕ𝕖𝕚 (@neinei_ninja250) December 20, 2021

In the photo, the sky looked as if it had been divided cleanly in two, with a blanket of clouds on the right, and clear, blue skies on the left.

The icing on the cake is perhaps the electrical wires, which served to enhance the illusion of acting as a boundary in between the sky and the clouds.

However, the Twitter user did not mention the location where the photo was taken.

The photo of the unusual phenomenon has since gone viral on Twitter, with over 102,500 "likes" and 19,000 "retweets".

Twitter users share similar encounters

A similar sight was also captured by people in various parts of Japan as seen from photos shared online.

Here are more photos of the phenomenon:

Shikoku

自分も四国で遭遇しました😆 pic.twitter.com/FBdHi3N7gf

— YASU_1119Breath (@YASU_1119Breath) December 21, 2021

Hiroshima

広島の朝もありました(*⁰▿⁰*) pic.twitter.com/027ilPUnDD

— アザラ氏🦭 (@popsealsale) December 21, 2021

Okayama

"This is Okayama. I also encountered it in the morning. It's kind of mysterious, isn't it?", another commenter added.

https://twitter.com/yatuka_307/status/1473215037901017091

Fukuoka

Additionally, a netizen from Fukuoka also came across the same phenomenon on the way back from work.

FF外から失礼します🙇‍♂️
福岡県なんですけど仕事帰りに遭遇しました！ pic.twitter.com/oDqZ7c2x3G

— こーたろ (@kotachan_darts) December 21, 2021

The extraordinary sight also trended on Reddit, garnering more than 15,200 "upvotes" and 164 comments, and several Taiwanese media outlets also reported on the sighting.

Earthquake clouds?

Some Japanese netizens who tweeted photos of the phenomenon also described this to be the "Earthquake clouds" or jishingumo, according to SoraNews24.

However, jishingumo is just a local folk wisdom and scientists have not established any evidence that cloud formations are signs of earthquakes.

The weather phenomenon is likely due to the collision of two air masses known as a front.

今日は、いつもと違う雲が
出ているワン( ｰ̀дｰ́ )ﾑﾑｯ…

地震雲 じゃないよね?!😱 pic.twitter.com/i1mZYesPpE

— パグのマヨ (@pagupagumayo6) December 20, 2021

朝うわなにこれと思って
写真撮ったけど、これ地震雲なの…？
しかも瀬戸内地域だけとか怖いんだけど pic.twitter.com/2nRqSe14wF

— なっぱ (@_wahu_wahu_) December 21, 2021

https://twitter.com/Po9n1x/status/1473150222109147138

今朝の空 何年見上げても見れない空

#地震雲 #いまそら #いまそら部 pic.twitter.com/tUgDjueSge

— 炭水化物 (@LfSOM8De2Zr1c36) December 21, 2021

https://twitter.com/Qzy172/status/1473216027316355075

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Top image via @neinei_ninja250/Twitter & @qzy172/Twitter