What is Freezing Fog?

Photo: Amy Woodward

From the National Weather Service in Jackson, Ky.:

Freezing fog occurs when the water droplets that the fog is composed of are "supercooled." Supercooled water droplets remain in the liquid state until they come into contact with a surface upon which they can freeze. As a result, any object the freezing fog comes into contact with will become coated with ice. The same thing happens with freezing rain or drizzle.

The after-effects of frozen fog, as photographed by Flickr user Amy Woodward. "Woke up to this winter wonderland which, according to the weatherman, is caused by frozen fog. The air was filled with sparkles as it melted off the trees."

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This Day In Weather History

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Hottest day ever: Baltimore (downtown), MD - 107, highest ever. Cumberland & Frederick, MD - 109 degrees, state record. Runion, New Jersey - 110 degrees, state record. Philadelphia, PA - 104 degrees, tied July record. Phoenixville, PA - 111 degrees, state record. Richmond, VA - 105 degrees, tied July record. Martinsburg, WV - 112 degrees, state record

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A tornado tracked 17 miles through the Black Forest. Three people were killed and 1,780 homes were destroyed.