Debris Flow in California, January 17 to 23, 2023

Name: Debris Flow in California, January 17 to 23, 2023
Start: 2023-01-17T08:30
End: 2023-01-23T00:00
Location: California

January 17 to 23, 2023 · NWS MTR · 1 event in 1 county or zone

On January 17th and 18th, two separate landslides impacted the ACE commuter rail track between Fremont and Sunol, forcing the cancellation of service until the 23rd.

Where it happened

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The toll

Deaths: 0
Injuries: 0
Property damage: $10
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 MTR wrote it up.

On January 17th and 18th, two separate landslides impacted the ACE commuter rail track between Fremont and Sunol, forcing the cancellation of service until the 23rd.

The radar

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

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Event by event

1 debris flow. Local standard time, as filed.

Debris Flow, Alameda

When: January 17, 8:30 AM PST to January 23, 12:00 AM PST
Where: Alameda County, 0.73 mi ESE of Decoto to 0.43 mi N of Sunol
Cause: Heavy Rain
Property damage: $10
Reported by: Broadcast Media
Coordinates: 37.598, -121.967

Two separate landslides, one on Tuesday the 17th at 8:30 AM, and another on Wednesday the 18th during the morning, resulted in the suspension of ACE commuter rail service until the 23rd. The first landslide forced the ACE trains to stop on the section of rail parallel to Niles Canyon Road, with the train brought back to Pleasanton and bus bridges bringing passengers to their final destination.

What these are

Debris Flow: A fast-moving slurry of mud, rock and debris, usually on a slope soaked by heavy rain or stripped by a fire.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in California in 2023 Every state in 2023 This day in weather history Warnings in California, January 2023

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: 1080071.