It’s amazing how fast fog can form. The photos above are from the Radford High School WeatherBug Camera. Fog is a common occurrence during October due to the large temperature swings.
The first photo is around 7:05 a.m. Friday morning. Since temperatures are usually the coldest just before sunrise, the moist air cools to the dew point and fog forms along the New River.
As the temperatures gets even cooler at sunrise, more fog forms. Once temperatures begin to warm after sunrise, the fog evaporates.