Flash Flood in Tuolumne County, California

Flash Flood July 20, 2018 · Tuolumne County, California

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

What the National Weather Service wrote

Overflowing water from a strong thunderstorm which produced heavy rain closed down a section of State Route 120 near Tuolumne Meadows. The duration of the flash flood was around one hour.

The wider storm

A southerly flow aloft brought some high level moisture into Central California on July 20. The moisture was sufficient enough for thunderstorms to develop over the higher elevations of the southern Sierra Nevada in the afternoon as the airmass became unstable with daytime heating. A few of the thunderstorms produced locally heavy rainfall over Yosemite National Park.

Began near Aspen Vly (37.8700, -119.3500).

Source: NOAA Storm Events Database, event 759279. Narratives are written by the National Weather Service forecast office that issued the report.

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