Meteorologist Sven Sundgaard predicted this wacky winter weather back in October, and he explains what's happening now and what might happen next.

Temperatures could fall below -20 F across certain parts of North Dakota and Minnesota.

Meteorologists warn that a stretched polar vortex could bring severe winter weather to much of the United States ...

Temperatures like this used to happen regularly across the state, but warming winters have made them far less frequent.

A dramatic blast of cold air may be coming for the United States in late January, courtesy of the polar vortex. Here's what ...

The northern U.S. is bracing for bone-chilling cold as a weakened polar vortex pushes Arctic air south. The planet's most extreme cold air will be barreling into the central and eastern United States ...

The frigid temperatures, massive snow and deadly ice storm taking shape east of the Rockies might seem to conflict with life on a rapidly warming planet. But all of these things still happen, even ...

Add Yahoo as a preferred source to see more of our stories on Google. Michigan is set for several days of frigid temperatures and heavy lake-effect snow as Arctic air continues its slow march across ...

A major polar vortex is about to hit the US and people across the country might face frigid temperatures for weeks, with even a chance of snowfall in Florida. Fox Weather reported an estimated 170 ...