Dense Fog in La Sal & Abajo Mountains, Utah

Widespread dense fog developed near the Abajo mountains during the afternoon and evening of January 1. The KU64 AWOS at the Monticello Airport reported several hours of 1/4-mile visibility due to dense fog. No reports of injuries, damages, or fatalities were received.

A deep Pacific trough brought moist southwesterly flow to much of the western CONUS on January 1. A weak upper-level jet streak arrived in coincidence with the surge of moisture, prompting widespread precipitation in eastern Utah throughout the morning of the 1st. Strong cold air advection behind the storms rapidly saturated valleys, and areas of dense fog developed during the afternoon and lasting through the morning of January 2.