Dense Fog in Merced-madera-mendota, California

Visibility below a quarter mile was reported in Madera.

A weak system moved through northern California on December 16 which brought some light precipitation to the area mainly to the north of Fresno County. An upper ridge shifted inland into California during the morning of December 17 behind this system which brought clearing skies and light winds to the San Joaquin Valley. This allowed for patchy dense fog to form in the center portion of the valley around sunrise on December 17. At least one multiple vehicle accident took place on SR 198 when visibility was reduced to an eighth of a mile. The fog lifted into a low cloud deck by late morning.