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Freezing rain is one of the most difficult events to forecast.
Freezing rain occurs less frequently than other winter weather events and falls in very narrow bands, usually not more than 50 kilometers wide. When the raindrops enter the shallow layer of cold air, they supercool and freeze instantly on contact. The warm layer is very shallow so ice crystals only partially melt as they pass through. Once they enter the cold layer below, they freeze again and strike the ground as ice pellets, or sleet. The entire sounding is completely below freezing so the precipitation reaches the ground as snow.