The Polar Vortex Is Behaving Strangely. What It Means for the U.S.
Summary
AccuWeather says the polar vortex is weakening unusually early in the season, with winds high above the Arctic forecast to fall to 9 mph on November 3. The forecaster does not expect a major Arctic cold outbreak in the United States because much of Canada remains unusually warm; it says colder periods may develop later in November and into December.Key Facts
- AccuWeather forecast polar-vortex winds of 9 mph on November 3, compared with a reported average of 58 mph and a previous record low of 32 mph for that date.
- The polar vortex is a large area of low pressure and cold air around each pole that strengthens during winter.
- AccuWeather meteorologist Tyler Roys said too little cold air has built up in Canada to fuel a major Arctic outbreak in the United States.
- The article reports that the coldest air is centered over northern Russia, where a southward shift could affect Asia and Europe more than the United States.
- AccuWeather said high pressure has kept temperatures in parts of Canada 10 to 20 degrees Fahrenheit above historical averages.
- AccuWeather expects some U.S. areas to turn cooler in the first half of November, with some of the sharpest temperature drops possible in the Southwest.
- The forecaster said the jet stream pattern could allow chillier air to move south later in November and into December.
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