Dense Fog — Merced and Madera, California

2020-12-19 to 2020-12-20 · Merced and Madera, California

Event narrative

Merced, Atwater and Madera reported visibility below a quarter mile.

Wider weather episode

Strengthening high pressure over central California resulted in areas of dense fog reforming during the evening of December 19, and by the morning of December 20 widespread dense fog was present across the San Joaquin Valley reducing visibility to a few hundred feet over a large area. The fog persisted across much of the valley through midday on December 20 then lifted into a stratus deck during the early afternoon.

Source: NOAA Storm Events Database, event_id 925619. Narrative written by the NWS forecast office that issued the report.