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Dense Fog in East Bay Interior Valleys, California

Dense Fog December 9, 2019 · East Bay Interior Valleys, California

What the National Weather Service wrote

Concord Airport ASOS recorded visibility down to a quarter mile on and off during this time period.

The wider storm

Residual low-level moisture from recent rainfall in combination with longer December nights and a stable airmass allowed for the formation of dense fog across the North and East Bay Valleys as well as along the San Francisco Bay shoreline. Multiple airports recorded visibility down to a quarter of a mile or less.

Source: NOAA Storm Events Database, event 864884. Narratives are written by the National Weather Service forecast office that issued the report.

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