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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 ]
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 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.
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 ...
Editor's Note for Sat. Jan. 18: A polar vortex is set to impact much of the US. Click here for the latest update.. A polar vortex is forecasted to blanket most of the continental United States in ...
The 2021–22 North American winter was not as significant and record-breaking as the previous winter season.Despite this, several notable and significant events still occurred, including two separate record-breaking tornado outbreaks in mid-December, a significant winter storm in the South in mid-January, a powerful blizzard that impacted the Northeast coast at the end of January and a wide ...
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 ...
The polar vortex works counterintuitively to what you might expect – the stronger it is, the less impactful it is. When the polar vortex is strong, cold air is less likely to plunge deep into ...