on 2011-12-22 15:08 Cotty wrote
V cool!
<http://www.bbc.co.uk/news/uk-england-leeds-16302606>
these are fairly common in the Colorado front range, especially in Boulder
where i lived for some time; i understand they form as a result of a standing
wave in the atmosphere; the examples on the BBC page are very fine and more
multi-layered than we are used to seeing
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