I think its some form of alien dandruff (AD) . Rumor has it that there is a "AD" warning in effect for our area in mid NC. Haven't seen the stuff in a few years. I guess its the result of all those "alien" "drone" activities recently....
We're in the middle of getting 1"-2" of snow/ice mixture. In SC this is like Armageddon. The way people act and drive, you would think its the end of the world, even though it'll all be gone tomorrow by noon.