May 7, 2015
A very large and cold upper-level low deepened along the West Coast before moving inland directly over southern California. This late-season system brought significant rain and snow showers over and west of the mountains on the 7th and 8th. Most of these areas saw between one-quarter of an inch and one inch of precipitation over these two days. The snow level dropped to around 3500 feet with light snow falling, but not sticking at that elevation. Above 4000 feet, snow amounts ranged from 1 to 6
Source: NOAA National Weather Service Storm Events Database (event 582566). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in San Diego County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.