A phenomenon known as sudden stratospheric warming has occurred in the arctic region during the past few days. The stratosphere is located between 6 miles and 30 miles above the ground. Often when this occurs, it forces cold air to build in the lowest layer of the atmosphere then to drive southward.
The problem is the exact timing and location of the emergence of this cold air is uncertain. Typically, the movement of cold air begins 10 to 14 days later.
During the next week or so, a flow of milder Pacific air will invade much of the nation. Because of the time of year, some locations (the northern part of the Great Basin and northern New England) may hold on to the cold they have now due to long nights, light winds and weak sunshine. However, most locations will experience an upswing in temperature for at least a several-day period.
According to AccuWeather.com’s Long Range Team, including Mark Paquette, “Overlaying this with other tools, we expect to see cold air spreading out from central Canada later next week into week three of January.”-AccuWeather.com
Read more….Brutal Cold Waves Could be Heading for the U.S..