The Appalachian region is currently experiencing significant foggy conditions, leading to reduced visibility across the area. Temperatures are around 44°F (7°C) under partly cloudy skies, with the fog primarily caused by the combination of cool temperatures and high humidity typical of the mountainous terrain. Fog, a common meteorological phenomenon, consists of suspended water droplets or ice crystals that reduce visibility, often below 1 kilometer. In the Appalachians, the topography encourages advection fog, where warm, moist air cools over a colder surface, causing condensation.