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Weather

Upside-down rainbow

13 replies

Yamadori · 10/08/2026 18:53

I was standing in my garden looking at clouds and l just saw an upside-down rainbow and can't quite believe it. Towards the west and high up, with some very high wispy cloud there too.

It pretty much disappeared by the time I got my phone out, so no photo, but I looked it up online and apparently it is called a circumzenithal arc.

Wow. Has anyone else ever seen one?

OP posts:
DonaldWheresMaTweezers · 10/08/2026 19:06

No! How fascinating. The best I have seen is a double rainbow, one under the other.

Yamadori · 10/08/2026 19:10

@DonaldWheresMaTweezers I could hardly believe my eyes, to be honest.

Love the username by the way!

OP posts:
DonaldWheresMaTweezers · 10/08/2026 19:25

Ha ha, thank you😆

I'm going to be looking out for upside down rainbows now - I had no idea they existed.

parkezvous · 10/08/2026 20:10

Was it a sundog?

Yamadori · 10/08/2026 21:15

@parkezvous No, I've seen those several times before, this was definitely an actual u-shaped rainbow.

OP posts:
StormGazing · 10/08/2026 21:17

Was it the underside of a round rainbow? 🌈

StormGazing · 10/08/2026 21:19

Just looked it up … it’s a thing!

O00ps · 10/08/2026 21:22

How wonderful!
I saw one on its side, not quite upside down but definitely not the usual way up, it was also quite high up, or was smaller than a usual rainbow.

Morethanadecade · 10/08/2026 21:22

I’ve seen one before, many years ago. It was astonishing. No idea it was called that, though.

Youcunnyfunt · 10/08/2026 21:56

A few months ago I saw London on the horizon driving on the m3 into Basingstoke. London is around 50 miles from Basingstoke. Apparently the phenomenon is called fata morgana, aka superior mirage. Conditions project the horizon into the sky.

Physics is so mad and cool sometimes.

Yamadori · 10/08/2026 22:12

O00ps · 10/08/2026 21:22

How wonderful!
I saw one on its side, not quite upside down but definitely not the usual way up, it was also quite high up, or was smaller than a usual rainbow.

That might have been a sun dog. Usually there are two some distance apart, but sometimes you can only see one of them.

OP posts:
Norugratsatall · 10/08/2026 22:47

Youcunnyfunt · 10/08/2026 21:56

A few months ago I saw London on the horizon driving on the m3 into Basingstoke. London is around 50 miles from Basingstoke. Apparently the phenomenon is called fata morgana, aka superior mirage. Conditions project the horizon into the sky.

Physics is so mad and cool sometimes.

I have just googled this. Absolutely fascinating! I never knew this was a thing……positively blows the mind.

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