Flood — Contra Costa, California

2020-01-16 · near Martinez, Contra Costa, California

Event narrative

Roadway flooding at SR-4 W and Alhambra Ave off ramp. Flooding across entire slow lane.

Wider weather episode

A potent cold front swept through the region on January 16th bringing widespread rain, gusty winds, low elevation snow, and thunderstorms. This system brought widespread roadway flooding, downed trees, small hail, and snow as low as 2400 ft in elevation. Numerous flights were delayed or canceled at SFO due to the weather.

View location on OpenStreetMap → (37.9912, -122.1303)

Source: NOAA Storm Events Database, event_id 867344. Narrative written by the NWS forecast office that issued the report.