However, a deep freeze, thanks to the polar vortex dipping down from Siberia, is bringing an even harsher arctic blast to million Americans this week. Maps show what to expect as the cold front ...

It’s about to get much colder across northeastern Oklahoma, with an arctic front dropping temperatures from Saturday through at least Tuesday and a chance of some weekend snow flurries. Wind ...

As happened earlier this month, this cold snap comes from a disruption in the polar vortex, the ring of cold air usually trapped about the North Pole. That ring is being stretched south across ...

As happened earlier this month, this cold snap comes from a disruption in the polar vortex, the ring of cold air usually trapped about the North Pole. That ring is being stretched south across ...

The polar vortex, a ring of frigid air typically located near the North Pole, will become stretched and displaced through early next week, carving a path across the central and eastern United States.

The temperature is predicted to be around 22 degrees during the swearing-in, the coldest since Ronald Reagan’s second inauguration.

Most interestingly, we observe that the output profiles of the vortex beams shrink with increasing power, accompanied by slight fragmentation, before expanding into asymmetric rings with fork- like ...

A series of disturbances in the atmosphere is sending the polar vortex south (again) next week with a burst of even colder Arctic air than last week.

Most of the US will enjoy milder temperatures on Thursday, but the warmup will be brief as a polar vortex will send temperatures tumbling below freezing for most of the nation starting this ...

As happened earlier this month, this cold snap comes from a disruption in the polar vortex, the ring of cold air usually trapped about the North Pole. That ring is being stretched south across ...