California, 2019Dense Fog in California, December 8 to 9, 2019
December 8 to 9, 2019 · NWS MTR · 7 events in 4 counties and zones
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.
Every event with a place to put it; 7 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 7
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
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.
Dense Fog, North Bay Interior Valleys
- When
- December 8, 10:55 PM PST to December 9, 10:55 AM PST
- Where
- North Bay Interior Valleys forecast zone
- Reported by
- ASOS
- Coordinates
- 38.362, -122.667 (the zone’s center; the record gives no point)
Novato Airport station recorded visibility down to a quarter of a mile or less.
Dense Fog, North Bay Interior Valleys
- When
- December 8, 11:45 PM PST to December 9, 10:40 AM PST
- Where
- North Bay Interior Valleys forecast zone
- Reported by
- ASOS
- Coordinates
- 38.362, -122.667 (the zone’s center; the record gives no point)
Napa County Airport ASOS recorded visibility down to a quarter of a mile or less the majority of this time period.
Dense Fog, San Francisco Bay Shoreline
- When
- December 8, 11:50 PM PST to December 9, 8:53 AM PST
- Where
- San Francisco Bay Shoreline forecast zone
- Reported by
- ASOS
- Coordinates
- 37.561, -121.980 (the zone’s center; the record gives no point)
Oakland Airport ASOS recorded visibility down to a quarter mile or less during the majority of this time period.
Dense Fog, East Bay Interior Valleys
- When
- December 9, 1:23 AM PST to 10:35 AM PST
- Where
- East Bay Interior Valleys forecast zone
- Reported by
- ASOS
- Coordinates
- 37.787, -121.934 (the zone’s center; the record gives no point)
Livermore Airport ASOS recorded visibility down to a quarter mile or less.
Dense Fog, East Bay Interior Valleys
- When
- December 9, 1:28 AM PST to 3:45 AM PST
- Where
- East Bay Interior Valleys forecast zone
- Reported by
- ASOS
- Coordinates
- 37.787, -121.934 (the zone’s center; the record gives no point)
Concord Airport ASOS recorded visibility down to a quarter mile on and off during this time period.
Dense Fog, San Francisco Peninsula Coast
- When
- December 9, 2:55 AM PST to 5:55 AM PST
- Where
- San Francisco Peninsula Coast forecast zone
- Reported by
- ASOS
- Coordinates
- 37.229, -122.183 (the zone’s center; the record gives no point)
Half Moon Bay Airport ASOS recorded visibility down to a quarter mile.
Dense Fog, San Francisco Bay Shoreline
- When
- December 9, 3:49 AM PST to 7:50 AM PST
- Where
- San Francisco Bay Shoreline forecast zone
- Reported by
- ASOS
- Coordinates
- 37.561, -121.980 (the zone’s center; the record gives no point)
San Francisco Airport ASOS recorded visibility down to a quarter of a mile or less.
- Dense Fog
- Fog reducing visibility to a quarter mile or less, filed where it caused accidents or disruption.
After NWS Directive 10-1605, the rules offices file Storm Data by.
- Avalanche in Colorado, December 8, 20191 death · 1 event
- Flash Flood in Nevada, December 8, 2019$20,000 · 1 event
- Winter Storm in Minnesota, December 8 to 9, 201915 events
- Heavy Snow in Minnesota, December 8 to 10, 201913 events
- Heavy Snow in North Dakota, December 8 to 9, 20199 events
- Winter Storm in North Dakota, December 8 to 9, 20197 events
- Dense Fog in California, December 8 to 9, 20196 events
- High Wind in Texas, December 8, 201957 kt wind · 2 events
- High Wind in Alaska, December 8 to 10, 201962 kt wind · 1 event
- Blizzard in Alaska, December 8 to 10, 20191 event
- Wildfire in Texas, December 8, 20191 event
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 864879, 864878, 864881, 864883, 864884, 864882, 864880.