Interior valley fog that drifted into the East Bay brought visibility down to less than 1/4 mile. This prompted a Dense Fog Advisory to be issued for the East Bay valleys.
Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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.
The episode as NWS MTR wrote it up.
Interior valley fog that drifted into the East Bay brought visibility down to less than 1/4 mile. This prompted a Dense Fog Advisory to be issued for the East Bay valleys.
The national radar mosaic for the moment the first event began.
2 dense fog. Local standard time, as filed.
Concord airport recorded visibility of a quarter mile or less.
A quarter mile visibility or less was reported at Livermore Airport.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2018Every state in 2018This day in weather historyWarnings in California, December 2018
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: 791572, 791571.