This weekend, the Smoky Mountains are expected to be shrouded in dense fog, which will reduce visibility for tourists and outdoor enthusiasts. It is expected that the fog will be especially thick in the early morning hours, which will make driving and hiking more difficult. Because of the region's cooler temperatures and high humidity at this time of year, this weather pattern is typical. Visitors to the area should make plans in advance and be ready for reduced visibility. As temperatures rise and the sun aids in the evaporation of moisture in the air, the fog is expected to last until late morning.