Dense Fog — San Francisco Peninsula Coast, California

2021-01-09 · San Francisco Peninsula Coast, California

Event narrative

Visibility dropped down to 1/4 mile at the SF airport while runway visibility was reduced to 600 ft. This caused 22 aircraft holds for 669 minutes and 16 diversions at the airport.

Wider weather episode

Residual moisture from a system that passed through the previous day allowed patchy dense fog to develop across the Bay Area. Visibility dropped down to 1/4 mile at the SF airport while runway visibility was reduced to 600 ft. This caused 22 aircraft holds for 669 minutes and 16 diversions at the airport.

Source: NOAA Storm Events Database, event_id 944094. Narrative written by the NWS forecast office that issued the report.