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Cazakstan-
Extremely cool! There is a better article here https://www.theguardian.com/uk-news/2023/dec/20/rare-nacreous-clouds-spotted-over-scotland-and-england with some detail about how they are formed etc
A toasty -78 degrees. Nice.
Eejit
https://www.bbc.co.uk/weather/features/67769934