Decembers freezing rain — an unprecedented phenomenon

Freezing rain, which was held in late December in Moscow and led to numerous power outages and transportation problems, there has been in the region for the first time, told the head of the Russian Hydrometeorological Center Roman Vilfand.

"In the Moscow region actually freezing rain this length — it lasted four hours — was celebrated for the first time" — said Vilfand.

He added that there is evidence of a similar event in January 1971, but such serious consequences had never observed.

Vilfand said that a layer of ice, formed after the "freezing rain", of 2.5 centimeters. Felled 50,000 trees.

Freezing rain, according Vilfand, is formed at the boundary of warm and cold air masses, when there is a "sandwich" of alternating warm and cold layers of air.

In December, at the height of 1.3-1.5 thousand meters form a layer of warm air with a temperature of 3.5 degrees Celsius.

"Snowflakes, once in this layer, melted and then cooled in the surface layer and the cold froze instantly, falling to the surface," — said Vilfand.

According to him, a small "ice rain" usually occur two to three times a year, but the December event was unique to the region.

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