Twenty states, from Texas to Delaware, were on alert Friday for snow and ice as the storm continued to move across the South.

Snow will turn into sleet and freezing rain along parts of the Southeast, as well as southern Arkansas, the weather service reported. Forecasters warn that icy conditions, between a tenth and a quarter inch of ice, will make travel dangerous for many. Power outages and downed branches are also a concern.

Millions of residents across the Southern U.S. woke up to a rare chance to bust out the mittens and snow pants thanks to a cold snap that dumped snow in their backyards.