Flash Flood — Tuolumne, California

2020-08-17 · near Aspen Vly, Tuolumne, California

Event narrative

Park Service Rangers reported flash flooding on SR 120. A nearby weather station at Tuolumne Meadows reported 0.42 inches of rain and hail between 1500 and 1600 PST.

Wider weather episode

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.

View location on OpenStreetMap → (37.8785, -119.3374)

Source: NOAA Storm Events Database, event_id 903137. Narrative written by the NWS forecast office that issued the report.