Colder air is returning to the central and eastern U.S. as the polar vortex becomes more active, bringing fluctuating ...

The Arctic Oscillation is a metric used to describe the strength of the polar vortex, or mass of arctic air that rotates ...

While Earth’s climate has changed throughout its history, the current warming trend is clearly the result of human activities ...

Arctic air is expected to bring “near record cold” along with “dangerous wind chills” as it tracks south from the Northern High Plains on Friday, spreading into the Central Plains and Ohio Valley on ...

Cross-polar flow describes a unique meteorological setup most common during the winter. This is often responsible for many of the intense Arctic outbreaks that occur in the U.S. each decade. For cross ...

Boston has seen just one day so far this month where the average temperature was above the seasonal norm, daring me to ask — are you over the cold yet? Astronomical winter hasn’t even arrived (that ...

Memphis is gearing up for another round of cold temperatures the weekend of Dec. 13 and 14. The Eastern United States will experience a polar vortex, and it will impact most of Tennessee. A polar ...

It’s beginning to look a lot like Christmas around Georgia and we may have some freezing temperatures to match. And if you’re hoping for snow, this weekend could be your best bet. According to a ...

A polar vortex is expected to bring a "mega-dump" of cold air to the central and eastern United States. Western North Carolina will experience a temporary reprieve before temperatures plummet over the ...

A polar vortex is expected to bring frigid temperatures to the central and eastern United States this weekend. South Carolina will experience a significant temperature drop, with nightly lows reaching ...