California, 2019

Dense Fog in California, August 11, 2019

August 11, 2019 · NWS MTR · 5 events in 4 counties and zones

Dense fog was observed over the North Bay and portions of the Monterey Bay region on the morning of August 11. Multiple stations reported visibility at less than 1/4 mile.

Where it happened

Every event with a place to put it; 5 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

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  • Wind
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  • Cold
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  • Marine and coastal
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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 MTR wrote it up.

Dense fog was observed over the North Bay and portions of the Monterey Bay region on the morning of August 11. Multiple stations reported visibility at less than 1/4 mile.

The radar

The national radar mosaic for the moment the first event began.

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Event by event

5 dense fog. Local standard time, as filed.

Dense Fog, North Bay Interior Valleys

When
August 11, 5:00 AM PST to 7:50 AM PST
Where
North Bay Interior Valleys forecast zone
Reported by
ASOS
Coordinates
38.362, -122.667 (the zone’s center; the record gives no point)

The KSTS ASOS reported visibility less than 1/4 mile during this time.

Dense Fog, Northern Monterey Bay

When
August 11, 5:20 AM PST to 6:55 AM PST
Where
Northern Monterey Bay forecast zone
Reported by
AWOS
Coordinates
37.022, -122.010 (the zone’s center; the record gives no point)

The AWOS in Santa Cruz reported periods of reduced visibility down to 1/4 mile.

Dense Fog, Southern Monterey Bay and Big Sur Coast

When
August 11, 5:20 AM PST to 8:15 AM PST
Where
Southern Monterey Bay and Big Sur Coast forecast zone
Reported by
ASOS
Coordinates
36.240, -121.309 (the zone’s center; the record gives no point)

The ASOS at the KMRY airport reported reduced visibility at or less than 1/4 mile during this time.

Dense Fog, Northern Monterey Bay

When
August 11, 6:30 AM PST to 6:55 AM PST
Where
Northern Monterey Bay forecast zone
Reported by
ASOS
Coordinates
37.022, -122.010 (the zone’s center; the record gives no point)

The ASOS at KWVI airport reported visibility at or less than 1/4 mile during this time.

Dense Fog, Northern Salinas Valley / Hollister Valley / Carmel Valley

When
August 11, 6:40 AM PST to 7:30 AM PST
Where
Northern Salinas Valley / Hollister Valley / Carmel Valley forecast zone
Reported by
ASOS
Coordinates
36.423, -121.192 (the zone’s center; the record gives no point)

The ASOS at KSNS airport reported visibility at or less than 1/4 mile during this time.

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 2019Every state in 2019This day in weather historyWarnings in California, August 2019

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: 841999, 842003, 842004, 842002, 842000.