Posted for
Our World Tuesday. Here's what our world looked like Jan. 1, 2012.
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| Snow |
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| Hoar frost |
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| Snow on the ground, hoar frost on the branches. |
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| Hoar frost, close-up. |
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| Snow on the evergreens, hoar frost on the deciduous trees. |
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© Photos above by Richard Schear, January 1, 2012 |
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| Wikipedia photo |
Hoar frost (also called
radiation frost or
hoarfrost or
pruina) refers to the white ice crystals, loosely deposited on the ground or exposed objects, that form on cold clear nights when heat losses into the open skies cause objects to become colder than the surrounding air. A related effect is
flood frost which occurs when air cooled by ground-level radiation losses travels downhill to form pockets of very cold air in depressions, valleys, and hollows. Hoar frost can form in these areas even when the air temperature a few feet above ground is well above freezing. Nonetheless the frost itself will be at or below the freezing temperature of water.
Wikipedia
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| The tracks of one deer across the snow in our cul-de-sac. |
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| Snow on my little Alberta Spruce outside my new window. |
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© Photos from my new window by Kay Davies, January 1, 2012 |
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| Hoar frost on the leafless trees and on the overhead wires. |
