Dense Fog — North Bay Interior Valleys, California

2021-09-05 · North Bay Interior Valleys, California

Event narrative

Napa County Airport ASOS reported visibility down to a quarter mile on and off during this time period. Weather sensor also reported fog.

Wider weather episode

Patches of dense fog formed into the early morning of September 5th around the San Francisco Bay Area and down to Monterey. Observations ranged from 1/8 of a mile to 2 miles in affected areas.

Source: NOAA Storm Events Database, event_id 979071. Narrative written by the NWS forecast office that issued the report.