An upper level ridge over Southern California plus light winds resulted in dense fog in San Diego County in the early morning hours of September 8th and 9th. Northern San Diego County experienced dense fog on the 8th, while southern San Diego County had fog on the 9th.
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 SGX wrote it up.
An upper level ridge over Southern California plus light winds resulted in dense fog in San Diego County in the early morning hours of September 8th and 9th. Northern San Diego County experienced dense fog on the 8th, while southern San Diego County had fog on the 9th. Both mornings, the most dense fog occurred between 5 AM and 7 AM PST. Fog was particularly dense near Miramar Airport, Carlsbad Airport, Montgomery Field and Brown Field.
The national radar mosaic for the moment the first event began.
2 dense fog. Local standard time, as filed.
Dense fog with visibility 1/4 mile or less was observed at Carlsbad Airport between 5 AM and 7 AM PST on the 8th. Fog began to clear after sunrise.
Visibility of 1/4 SM or less was observed in the valley areas of San Diego County at NKX, SDM, and MYF on the morning of September 9th. This dense fog was observed from 2 AM to 7 AM PST at those ASOS sites, and began clearing after sunrise.
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, September 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 2026-10-01. Each event’s entry at NCEI: 786381, 786380.