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An illustration of the polar jet stream and the polar vortex in the layers of atmosphere above the northern hemisphere shows the elongated shape of the vortex on Jan. 16, 2025.
Is the polar vortex coming? Looking ahead, much colder air is predicted to arrive in waves across the central, eastern and southern U.S. over the first week to 10 days of January.
Such plunges occur when the air currents that keep frigid air over the North Pole — the polar vortex — weaken, and the freezing arctic air slips south and pushes the vortex down with it.
On December 6, the continued deterioration of the polar vortex led to the jet stream pushing southward, bringing record cold temperatures across the Eastern U.S. During the cold wave, which extended from December 6–10, over 150 daily precipitation records [ 24 ] and close to 100 daily snowfall records were broken across the northeastern ...
The term polar vortex can be used to describe two distinct phenomena; the stratospheric polar vortex, and the tropospheric polar vortex. The stratospheric and tropospheric polar vortices both rotate in the direction of the Earth's spin, but they are distinct phenomena that have different sizes, structures, seasonal cycles, and impacts on weather.
The south polar vortex was imaged again in 2013 and it was determined that the vortex forms higher up in the atmosphere than previously thought. The hazy atmosphere that Titan has leaves the moon unilluminated in the Sun's rays but the image of the vortex showed a bright spot on the south pole.
Late in 2020 and early in 2021, AccuWeather meteorologists warned that a weakening of the polar vortex was coming and a major southward discharge of cold air would follow during the second half of ...
" The polar vortex is defined as a mass of cold air that is tightly bound to polar regions by strong counterclockwise winds known as the polar jet stream," Thornton explained.