Feb 4, 2019
A mid/upper low with a very cold airmass moved through in early February bringing snow to lower elevation peaks across the region prompting a rare Winter Weather Advisory. Junipero Serra Peak received around a foot of snow. Rainfall just ahead of this system also brought roadway flooding and minor debris flows.
Source: NOAA National Weather Service Storm Events Database (event 800426). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in San Francisco County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.