Apr 7, 2018
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
Source: NOAA National Weather Service Storm Events Database (event 744513). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in San Mateo County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.