Dense Fog in La Sal & Abajo Mountains, Utah

Brief and localized dense fog developed near the Abajo mountains during the early morning period of February 12. The KU64 AWOS at the Monticello Airport reported about one hour of 1/4-mile visibility due to dense fog. No reports of injuries, damages, or fatalities were received.

Weak remnants of an atmospheric river arrived to the Four Corners region during the afternoon of February 11 and overnight into the morning of February 12. Primarily virga showers dominated as the plume of moisture first arrived. Surface moisture eventually caught up near the Abajo Mountains around midnight and coinciding with brief rain showers. The mid-level atmosphere dried out again prior to sunrise, promoting radiational cooling amidst clearing skies and the development of sparse, yet dense fog.