Colorado will have a long stretch of below freezing and below-zero wind chills, with several inches of snow likely as well.

A polar vortex will plunge Colorado into bitter, sub-zero cold this weekend and could bring up to 10 inches of snow in some parts of the Denver metro, National Weather Service meteorologists say.

Here is what is and isn't a polar vortex when Colorado receives cold like what is forecast for the holiday weekend.

Still, several Colorado school districts will start late on Tuesday as the state waits out the last of subzero temperatures.

Here are the lowest temperatures across Colorado on Tuesday morning, according to the National Weather Service.

Research has found that rising temperatures in the Arctic are weakening weather systems that normally trap the cold around ...

A strong polar vortex in the stratosphere has brought subzero temperatures to the Midwest, Mid-Atlantic and deep into the South.