Flash Flood in Nevada County, California

Flash Flood August 27, 2025 · Nevada County, California

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

What the National Weather Service wrote

Flash flooding with mud and debris on westbound I-80 resulting in a lane closure. Upwards of 1.21 inches of rain was recorded during the incident.

The wider storm

A high amount of atmospheric moisture in the region interacted with a short-wave trough, allowing for widespread heavy precipitation. This was day five of an extended push of monsoon moisture that produced heavy rain, localized flooding, strong outflow winds.

Began near Flonston (39.4000, -120.0200).

Source: NOAA Storm Events Database, event 1280336. Narratives are written by the National Weather Service forecast office that issued the report.

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