Rime ice on tree (DI00365)
This slide shows rime ice after two days of freezing fog. Rime ice, formed from supercooled fog (water droplets that remain below freezing until they have a surface on which to freeze), is an accumulation of granular ice tufts on the windward side of exposed objects. These ice needles, about 2 inches (5 centimeters) long, point into the direction from which the wind was blowing during the fog.
copyright University Corporation for Atmospheric Research