The World Meteorological Organization definitions of black ice are: Black ice can also form when roadways are slick from rain and temperatures drop below freezing overnight." It is most prevalent during the early morning hours, especially after snow melt on the roadways has a chance to refreeze over night when the temperature drops below freezing. It is often clear (not white) with the black road surface visible underneath. The term "black ice" in the United States is defined by the National Weather Service as "patchy ice on roadways or other transportation surfaces that cannot easily be seen.
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