Dense Fog — Merced and Madera, California

2020-12-15 · Merced and Madera, California

Event narrative

Merced and Atwater reported visibility below a quarter mile. California Highway Patrol reported visibility between 500 to 1000 feet on Sante Fe Ave between Le Grand and the Madera County border.

Wider weather episode

High pressure strengthened over central California between the afternoon of December 14 and the early morning of December 15. This resulted in inversion conditions over the central San Jaoquin Valley during the morning of December 15 and with clear skies and light winds previaling, an area of dense fog formed along the State Route 99 corridor between Turlock and Tulare. The fog was most prevalent in Merced County where it persisted until late morning.

Source: NOAA Storm Events Database, event_id 924599. Narrative written by the NWS forecast office that issued the report.