Dense Fog, Sw S.J. Valley
- When
- December 30, 6:40 AM PST to 9:35 AM PST
- Where
- Sw S.J. Valley forecast zone
- Reported by
- ASOS
Visibility below a quarter mile was reported in Hanford.
Dense Fog in California, December 30, 2017
A stagnant airmass was present over the San Joaquin Valley during the morning of December 30. High clouds streamed over the area overnight, but there was enough clearing toward sunrise and winds remained light.
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- 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 HNX wrote it up.
A stagnant airmass was present over the San Joaquin Valley during the morning of December 30. High clouds streamed over the area overnight, but there was enough clearing toward sunrise and winds remained light. A small area of dense fog developed in the southwestern portion of the San Joaquin Valley. At least 3 minor auto accidents were observed by commuting NWS employees.
Event by event
1 dense fog. Local standard time, as filed.
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
- Extreme Cold in Illinois, December 30 to 31, 2017
- Cold in West Virginia, December 30 to 31, 2017
- Winter Weather in Texas, December 30 to 31, 2017
- Extreme Cold and Cold in Iowa, December 30 to 31, 2017
- Extreme Cold in South Dakota, December 30 to 31, 2017
- Extreme Cold in South Dakota, December 30 to 31, 2017
- Cold in South Dakota, December 30 to 31, 2017
- Winter Weather in Texas, December 30 to 31, 2017
- Extreme Cold in Iowa, December 30 to 31, 2017
- Extreme Cold in Minnesota, December 30 to 31, 2017
- Extreme Cold in Montana, December 30 to 31, 2017
- Extreme Cold in Montana, December 30 to 31, 2017
More
Every storm in California in 2017Every state in 2017This day in weather historyWarnings in California, December 2017
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: 725757.