Mysterious horizontal tornado appeared in the sky of Virginia

A rare phenomenon appeared in the sky of the U.S. State of Virginia on Tuesday: a cloud that looked like a giant tornado horizontal astonished inhabitants (scroll down for video).

Horizontal tornado: strangely-shaped arcus cloud emerged in Virginia sky (Youtube/WWN)

The unusual weather phenomenon, known as arcus cloud appeared rolled in over the sky at around 7:30 p.m. Such a stunning cloud forms so rarely that even meteorologists from the National Weather Service in northern Virginia snapped photos of it from the windows of their offices.
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The horizontal tornadoes are caused by wind as well as changes in air temperature which roll the cloud in its strange shape.

“The cold air that descends, makes the hot wet air from the surface climb up to higher altitudes, where the moisture condenses into a cloud. Wind storms “roll” the cloud parallel to the horizon, creating an effect that looks like a horizontal tornado” explains Live Science.