Aug 17, 2020
Tropical moisture streamed northward into central California around a strong area of upper high pressure which brought record heat to much of the area. The moisture was sufficient enough for scattered thunderstorms to break out over the Sierra Nevada during the afternoon of August 17. One slow moving thunderstorm produced flash flooding along SR 120 in Yosemite National Park near Tuolumne Meadows.
Source: NOAA National Weather Service Storm Events Database (event 903137). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Tuolumne County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.