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Originally posted by atsguy_106
could have been some high alt clouds casting shadows from above? Why has there been like 3 stories that all started the same way.."I was outside having a smoke.." lol
Originally posted by PartChimp
Would it be possible for fast moving clouds so high to make such formidably dark shadows?
Originally posted by OzWeatherman
No, high level clouds do not create shadows. High level clouds like cirrus, cirrostratus and cirrocumulus occur in between 20,000ft and 35,000ft and consist of ice crystals, so a lot of the time the sun significantly penetrates them. The thickest cirrus clouds occur at the top of thunderstorms but you said that the sky was pretty much clear, so that rules that out. I cant presently think of any atmospheric phenomenen that would occur how you described it.....certainly strange