"Hoar frost" forms amid ice storm
In between bouts of freezing rain, fog formed in a few areas. The artistic frost, known as "hoar frost" developed when water vapor, or fog fog touched a very cold surface and froze on it instantly.
This can happen to any object that's cold enough for the water vapor to freeze on.
Hoar frost requires a lot of moisture and is typically found along the rivers and streams when the air gets very cold and fog or mist rises from the water and freezes on the plants and trees.