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06-20-06, 02:39 PM #1FishTail Guest
Photo in the News: Rare "Rainbow" Spotted Over Idaho
June 19, 2006óIt looks like a rainbow that's been set on fire, but this phenomenon is as cold as ice.
Known in the weather world as a circumhorizontal arc, this rare sight was caught on film on June 3 as it hung over northern Idaho near the Washington State border (map of Idaho).
The arc isn't a rainbow in the traditional senseóit is caused by light passing through wispy, high-altitude cirrus clouds. The sight occurs only when the sun is very high in the sky (more than 58į above the horizon). What's more, the hexagonal ice crystals that make up cirrus clouds must be shaped like thick plates with their faces parallel to the ground.
When light enters through a vertical side face of such an ice crystal and leaves from the bottom face, it refracts, or bends, in the same way that light passes through a prism. If a cirrus's crystals are aligned just right, the whole cloud lights up in a spectrum of colors.
This particular arc spanned several hundred square miles of sky and lasted for about an hour, according to the London Daily Mail.
06-20-06, 02:39 PM #2
That's the coolest thing ever! Wow.Thereís a promise I need you to make
While Iím gone you take care of the love
And Iíll deal with the hate.
Donít worry about me; Iíll be all right
Just care for your children and sleep tight
Iíll keep you safe on my watch tonight
On My Watch Tonight - Mike Corrado
06-20-06, 02:40 PM #3
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