Don't be fooled by the string of uneventful weather — the polar vortex is rebooting and will take another swing, or several, at the greater Philadelphia region, leading to a turbulent weather pattern ...

Rising Arctic temperatures and melting sea ice could be causing cold air to flow into the Northern Hemisphere. But not all scientists agree. By Eric Niiler The polar vortex is a ribbon of ...

True Arctic cold air is going to drop into the Great Lakes region Monday and Tuesday. This looks like just the start of significantly colder-than-normal weather for a long stretch. Michigan does ...

When the polar vortex stumbles, the weather at ground level can pivot from mild to brutal in a matter of days. A circulation that usually spins quietly above the pole can suddenly send lobes of Arctic ...

There is a major weather pattern change underway across the U.S. As we get into next week, the storm track looks really interesting. Major upper-air pattern changes are quite normal. Sometimes we have ...

After sending temperatures plunging across Michigan this winter, the polar vortex has retreated. As if we hadn't noticed. "We are actually on the opposite side of it, on the warmer side," said Jaclyn ...