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Driven by the jet stream, part of the polar vortex — a large area of cold air that spins over the North Pole in the winter — will drop about 3,000 miles south into the U.S., delivering the ...
The polar vortex is a large area of cold air and low pressure that normally spins over the North and South Poles. During the winter months and when the jet stream allows, this cold air can drop ...
Areas of the southeast will see some snowfall over the weekend. According to the National Weather Service Office in Atlanta, areas of northwest Georgia have about a 50% chance of seeing snowfall.
The cities of Billings, Montana, and Fargo, North Dakota, experienced their longest streak of sub-zero (0 °F [−18 °C]) temperatures since at least 1983 and 1996, respectively. [ 16 ] [ 17 ] [ 18 ] Des Moines, Iowa , experienced its sixth-coldest February on record with an average temperature of 15.2 °F [−9.3 °C]. [ 19 ]
Starting in late December as a result of the southward shift of the polar vortex, extremely cold conditions froze the eastern United States in the last few days of 2017 as well as into the new year. Following a brief respite in mid-January, cold temperatures swung back into the eastern U.S. shortly afterwards.
The 2013–14 North American winter was one of the most significant for the United States and North America as a whole, due in part to the breakdown of the polar vortex in November 2013, which allowed very cold air to travel down into the United States, leading to an extended period of very cold temperatures.
When the polar vortex is strong, the mid-latitude Westerlies (winds at the surface level between 30° and 60° latitude from the west) increase in strength and are persistent. When the polar vortex is weak, high-pressure zones of the mid-latitudes may push poleward, moving the polar vortex, jet stream, and polar front equatorward. The jet ...
According to the Associated Press, this will be the 10th time this winter that the polar vortex — a large area of cold air that spins over the North Pole — will drop into the U.S., delivering ...