Add Yahoo as a preferred source to see more of our stories on Google. As temperatures rise, the timing of the ice thaw changes. Vincent Denarie via Arctic Report Card The Arctic is transforming faster ...

A weakened polar vortex is pushing frigid Arctic air into the central and eastern United States. Michigan will experience its coldest temperatures over the weekend, with some areas dipping below zero.

A surge of Arctic air will sweep into North Carolina late this week, bringing a sharp temperature drop, light mountain snow ...

Florida is preparing for a sharp temperature drop this week as Arctic air pushes deep into the Southeast.