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When the polar vortex is strong, cold air is less likely to plunge deep into North America or Europe. Picture this strong vortex fencing off the coldest air from the U.S. and Europe.
The polar vortex is a large area of low-pressure and cold air surrounding both of the Earth’s poles, according to the weather service. It always exists near the poles.
The polar vortex is a gigantic, circular area of cold air high up in the atmosphere that typically spins over the North Pole (as its name suggests), USA Today previously reported. It's a normal ...
A quasi-permanent phenomenon referred to as the polar vortex may have been partly responsible for the cold weather. Temperatures in much of the United States dropped 15 to 35 °F (8.3 to 19 °C) below average by November 19, following a southward "dip" of the polar vortex into the eastern two-thirds of the country.
The pattern continued into the first week of 2018, with more record lows being set following a significant blizzard that impacted the Northeastern United States in early January. By January 11, warmer temperatures had surged northeastwards, although following a winter storm a few days later , cold temperatures returned to the Northeast.
The 2014 Bering Sea bomb cyclone at peak intensity on November 8, over the Bering Sea.This system triggered the cold wave across North America. On November 8, the northward movement of a bomb cyclone associated with Typhoon Nuri's remnants shifted the jet stream far to the north, creating an omega block pattern, which allowed a fragment of the polar vortex to descend from Arctic region into ...
This large area of cold air stays tightly around the pole when the vortex is strong but can enter southerly latitudes if it weakens. The polar vortex is not synonymous with a cold snap.
The stratospheric polar vortex is an area of high-speed, cyclonically rotating winds around 15 km to 50 km high, poleward of 50°, and is strongest in winter. It forms during autumn when Arctic or Antarctic temperatures cool rapidly as the polar night begins.