Dense Fog in E Central S.j. Valley, California

Visibility below a quarter mile was reported in Madera.

Although the upper ridge that was centered over California weakened and shifted east during the morning of December 21, areas of dense fog formed in the central and south San Joaquin Valley and impacted travel along the State Route 99 corridor between Merced and Visalia. Only a few school districts in Tulare County delayed bus service as the fog coverage was not as extensive as during the previous morning. The fog dissipated by late morning as a cold front moved through the area.