The polar vortex is a “constant feature” that begins to develop sometime in September and persists through sometime in spring ...

Weather analysts are divided over the polar vortex’s influence on weather and what that means for the rest of this year’s winter.

The polar vortex is coming back. After a half-month hiatus, frigid air will again surge across the United States beginning this weekend through next week, as the unusually cold blob of air dips ...

The polar vortex is a persistent area of low pressure ... Well when we look at the graphic below, we see a ridge of high pressure bringing warm air northward. It's important to remember that ...

A group of people walk toward the pedestrian tunnel that connects Hyde Park to Promontory Point as Presidents Day temperatures dropped and stayed cold across the Chicago area on Monday. Tyler ...

Bitter cold temperatures are expected to continue throughout the week in Chicago, with wind chills plunging to minus 20, the National Weather Service said. A cold weather advisory is in effect ...

This AccuWeather graphic shows Arctic air returning to ... and the northernmost U.S. as part of a disruption in the polar vortex, but that does not mean that NYC is experiencing the onset of ...

The best news on this graphic for us is our most extreme numbers ... As you can see, this encounter with a lobe of the polar vortex stretched to the Southeast, while far from a local phenomenon ...

Many times during winter in the northern hemisphere, the polar vortex will expand, sending cold air southward with the jet stream (see graphic above)." "This occurs fairly regularly during wintertime ...

The audible teeth chattering “brrrr’s” have ended a 10-day bone chilling on February 20th. The 5 a.m. public forecast issued ...

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