24 November 2010
Magma Cum Laude has a great post with a shot of the “chimneys” in Upstate New York.
Here is mine. This chimney is in Banff Nat. Park, just outside of Banff, Alberta.
A few days later I saw this. The photo was taken at 4,000 meters, on top of Telescope Mountain, above Banff.
It was very cold (-25C) and the air was very dry. Tiny ice crystals in the air cause this. You can find out much more on the excellent Atmospheric Optics page by Les Cowley in the UK.