Dense Fog, W Riverside T X Nw
- When
- December 9, 5:54 AM PST to December 14, 10:00 PM PST
- Where
- W Riverside T X Nw forecast zone
- Reported by
- TRAINED SPOTTER
Dense Fog in California, December 9 to 14, 2004
Patchy dense fog reduced visibility to less than 100 feet at times during the late night and early morning hours. Most of the fog was confined to the coast and extreme southwestern Riverside and San Bernardino county valleys.
Where it happened
Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 5
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 SGX wrote it up.
Patchy dense fog reduced visibility to less than 100 feet at times during the late night and early morning hours. Most of the fog was confined to the coast and extreme southwestern Riverside and San Bernardino county valleys.
The radar
The national radar mosaic for the moment the first event began.
Event by event
5 dense fog. Local standard time, as filed.
Dense Fog, W/S Orange
- When
- December 9, 5:54 AM PST to December 14, 10:00 PM PST
- Where
- W/S Orange forecast zone
- Reported by
- TRAINED SPOTTER
Dense Fog, X Sw San Bernardino
- When
- December 9, 5:54 AM PST to December 14, 10:00 PM PST
- Where
- X Sw San Bernardino forecast zone
- Reported by
- TRAINED SPOTTER
- Coordinates
- 34.293, -116.086 (the zone’s center; the record gives no point)
Dense Fog, X W San Diego
- When
- December 9, 5:54 AM PST to December 14, 10:00 PM PST
- Where
- X W San Diego forecast zone
- Reported by
- TRAINED SPOTTER
- Coordinates
- 33.028, -116.770 (the zone’s center; the record gives no point)
Dense Fog, X W San Diego Valley
- When
- December 9, 5:54 AM PST to December 14, 10:00 PM PST
- Where
- X W San Diego Valley forecast zone
- Reported by
- TRAINED SPOTTER
- Coordinates
- 33.028, -116.770 (the zone’s center; the record gives no point)
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
- Tornadoes and Flash Flooding in Mississippi, December 9, 2004
- Tornado in Louisiana, December 9, 2004
- Damaging Wind in Louisiana, December 9, 2004
- Damaging Wind in Louisiana, December 9, 2004
- Flash Flooding in Alabama, December 9, 2004
- Hail and Damaging Winds in Georgia, December 9, 2004
- Damaging Winds in Alabama, December 9, 2004
- Dense Fog in Wisconsin, December 9 to 10, 2004
- Dense Fog in Wisconsin, December 9 to 10, 2004
- Flash Flooding in Tennessee, December 9, 2004
- Flash Flooding in Tennessee, December 9, 2004
- Flash Flood in Louisiana, December 9, 2004
More
Every storm in California in 2004Every state in 2004This day in weather historyWarnings in California, December 2004
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 2026-10-01. Each event’s entry at NCEI: 5431501, 5431502, 5431503, 5431504, 5431505.