The United States has been at the epicenter of the planet’s most unusually cold conditions early in 2025. The polar vortex is to blame.

It’s really, really cold again — as the US shivers through at least the eighth blast of air from the Arctic this winter. Winter, which is warming faster than any other season for much of the ...

There is a sudden warming about to happen high up in the atmosphere. This warming usually affects the Polar Vortex.

“Our memories are short as to what a normal winter is.” This diagram shows the general pattern and position of a stretched polar vortex that has brought the US multiple blasts of Arctic cold ...

Scientists say it’s being caused by a misbehaving polar vortex combining with a key weather pattern that seems to be stuck in place. Some scientists say these factors and this winter could be ...