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

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

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

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 ...

At the same time we go into a touch milder southwest flow, the polar vortex will still be churning away over northeast Canada. I don’t expect a full onslaught of the polar vortex to shift south ...

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