Debris Flow in Contra Costa County, California

Debris Flow January 17, 2019 · Contra Costa County, California

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Mud flow along hillside at Bollinger Canyon Rd just west of Bear Tree Road crossing westbound lanes.

The wider storm

A moderate to strong atmospheric river impacted much of California in the middle of the month. A weak surface low developed off the coast on January 15th bringing moderate to heavy rainfall to portions of the region. Over the next 24 to 36 hours a second strong low pressure system moved to the north and east bringing heavy rain, destructive winds, high surf, flooding, and thunderstorms to the Bay Area. Numerous reports were received of downed trees and power lines. Winds were recorded between 60 and 100 mph. Downed trees resulted in two fatalities.

Began near Danville (37.7977, -122.0259).

Source: NOAA Storm Events Database, event 797448. Narratives are written by the National Weather Service forecast office that issued the report.

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