California, 2009

Dense Fog in California, December 5, 2009

December 5, 2009 · NWS STO · 1 event in 1 county or zone

Reduced visibility due to dense fog caused accidents creating a 33 vehicle pileup, with numerous resulting injuries.

The toll

Deaths
0
Injuries
16
Property damage
$700,000
Crop damage
None recorded
Events
1

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.

What happened

The episode as NWS STO wrote it up.

Reduced visibility due to dense fog caused accidents creating a 33 vehicle pileup, with numerous resulting injuries.

Event by event

1 dense fog. Local standard time, as filed.

Dense Fog, Northern San Joaquin Valley

When
December 5, 7:25 AM PST to 8:00 AM PST
Where
Northern San Joaquin Valley forecast zone
Injuries
0 direct, 16 indirect
Property damage
$700,000
Reported by
Newspaper

Thirteen separate collisions caused a 33 vehicle pileup in dense fog on Interstate 5 near Lodi. There were 16 injuries reported, one of them serious.

What these are

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.

The same day elsewhere

More

Every storm in California in 2009Every state in 2009This day in weather historyWarnings in California, December 2009

Sources

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 2026-09-30. Each event’s entry at NCEI: 205856.