Flash Flood in Tuolumne County, California

Flash Flood August 17, 2020 · Tuolumne County, California

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

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.

The wider storm

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.

Began near Aspen Vly (37.8785, -119.3374).

Source: NOAA Storm Events Database, event 903137. Narratives are written by the National Weather Service forecast office that issued the report.

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