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Thundersnow.
That was properly mad, it woke us up at 4:40am, like a huge explosion, bright flash right beforehand which made me open my eyes.
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In 2003 I found myself literally inside a thundersnow storm in Switzerland. One of the most terrifying experiences of my life. I felt the lightning more than I heard it despite it being like a bomb going off. I remember feeling a shockwave hit my chest. Makes the hair stand up on the backs of my arms just thinking about it even now!
Thundersnow.
https://www.theguardian.com/uk-news/2020/dec/04/edinburgh-hit-by-thundersnow-as-sonic-boom-wakes-residents