Hoar Frost

[Jim]

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[quote="[URL=http://en.wikipedia.org/wiki/Frost#Types_of_frost>>]>>Wikipedia[/URL]"]Radiation frost (also called hoar frost or, sometimes, hoarfrost) refers to the white ice crystals, loosely deposited on the ground or exposed objects, that form when the air is moist, the wind is weak or absent and surfaces are cold. It is often seen on clear winter nights, especially in valleys and hollows. Hoar frost can form in these areas even when the reported temperature is above the freezing point of water.[/quote]