Researchers identify a new mechanism that allows avalanches containing a mixture of rock and ice to travel very long distances.

Heavy mixed precipitation is expected, the weather service said, with snow and sleet accumulations ... And there is high confidence of at least moderate ice impacts across Northeast Florida.

The first of multiple winter storms to hit the country through this weekend is ushering in a snowy, icy mess across the mid-Atlantic, where it's likely to create commuting headaches for millions.