Nov 29, 2018
A mid/upper level low moved through the region at the end of November. A cool unstable air mass allowed for the development of scattered thunderstorms across the region that produced lightning and small hail. An associated surface low approached the coast during this time causing high surf and gusty winds. Some locations saw wave heights above 25 feet. This system caused roadway flooding, minor debris flows, and downed trees along with damage from gusty winds.
Source: NOAA National Weather Service Storm Events Database (event 788882). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Napa County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.