A shift in the polar vortex could bring a blast of Arctic air to millions of Americans in the second half of March, forecasters have warned. The polar vortex usually keeps cold Arctic air confined ...

Both of these Arctic blasts are the result of pieces of the polar vortex pinwheeling out of Canada, bringing the coldest air in years to tens of millions of people.

Every year, weather enthusiasts eagerly watch and wait for signs that the polar vortex, a mass of cold air spinning around the Arctic, might meander south, sending cold and snow into the lower ...

The coldest burst of Arctic air this season is coming to put an icy exclamation point on America's winter of repeated polar vortex invasions, meteorologists warn. It will stay frozen there all ...

Earth’s major climate goal is too warm for the polar ice sheets, study says If Earth stays at its current levels of warming — below policymakers’ goal of 1.5 degrees Celsius — polar ice ...