Sep 11, 2017
A disturbance rotating around an upper level low west of San Diego brought thunderstorm activity to the Bay Area on September 11. Widespread reports of lightning were received along with a few small hail reports and strong wind gusts. It has been reported that there were over 40,000 lightning strikes across the Central Coast of California during this event. Several brush fires were also ignited due to lightning strikes.
Source: NOAA National Weather Service Storm Events Database (event 718743). 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.