Thursday, March 09, 2006

Iridescence





I saw this in Tampines the other day and was quite upset I didn't have any camera with me. Some guy over in Changi took a video though (same date), its strange what you can find online.

"Pileus or "mushroom cap" clouds are formed above cumulus. During the day warm moist air in cumulus rises and the clouds tower upwards. Sometimes their vertical growth pushes up a layer of moist air above them. The air layer expands as it is forced up into lower pressure surroundings and adiabatically cools. The water vapour in it suddenly condenses forming a misty veil-like layer of droplets above the cumulus - pileus cloud. Any cloud formed suddenly has all its droplets of similar size - ideal for iridescence or a coron."

I miss Geog class.

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