Flood in Contra Costa County, California

Flood April 7, 2018 · Contra Costa County, California

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

What the National Weather Service wrote

I-80 E adjacent to the Pomona on ramp, 2 feet of water in number 1 lane.

The wider storm

A late season Atmospheric River impacted the area in early April. A very moist airmass made landfall across the North Bay before moving southward across the rest of the Bay Area. The Oakland sounding measured record PWAT values of 1.69. The absence of large scale forcing prevent record breaking rainfall. Enough rain did fall, however, to cause minoir/nuisance flooding across much of the region. Numerous flood advisories were issued. Storm total rainfall amounts up to 7 were reported. The bulk of the impacts were felt on April 6,7.

Began near Selby (38.0525, -122.2267).

Source: NOAA Storm Events Database, event 744503. Narratives are written by the National Weather Service forecast office that issued the report.

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