Dense Fog in Northwestern San Juan Mountains, Colorado

Areas of dense fog developed within high-elevation valleys of the San Juan mountains resulting from multiple hours of snowfall during the early overnight period. The KTEX AWOS at the Telluride Regional Airport reported about four hours of 1/4-mile visibility from freezing fog around sunrise on the 20th. No reports of injuries, damages, or fatalities were received.

Southwesterly flow ahead of a trough brought increased moisture to southwestern Colorado. Terrain-driven showers fell over portions of the San Juan mountains as a result. Falling overnight temperatures paired with the increased moisture promoted widespread dense fog over high-elevation valleys in the San Juans.