Arctic air remains settled over southern Colorado on Wednesday with negative morning wind chills and freezing fog giving way to chilly afternoon sunshine. Another weak snowstorm arrives Thursday.

This week we're stuck in a cold air outbreak that some experts say is happening more frequently, and paradoxically, because of a warming world.

The plunging polar vortex brought subfreezing temperatures Tuesday to some of the southernmost points of the U.S., threatening to dump snow on parts of Texas and Oklahoma in the coming days and ...

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Schools in several states will remain closed on Wednesday after a winter storm brought over a foot of snow in some areas.