According to the National Weather Service, San Francisco will experience a mix of wet and dry conditions over the next seven ...

This upcoming system is expected to usher in even colder conditions, with some areas bracing for single-digit lows and temperatures in the low teens — marking the coldest weather of the winter so far.

A polar vortex is currently hitting the United States, with schools closed in many areas and at least four deaths caused by treacherous conditions.

According to the NWS, the Arctic polar vortex is a powerful band of west-to-east winds that develops in the stratosphere, ...