Debris Flow in Lassen County, California

Debris Flow July 30, 2025 · Lassen County, California

$15K

Damage as recorded

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

What the National Weather Service wrote

Intense rainfall lead to mudslides and rockslides along US-395 north of Red Rock Rd. This caused both lanes of traffic to shutdown.

The wider storm

An upper level wave moving through N CA/NV provided plentiful forcing for storms to develop on July 30. In fact, showers lingered overnight the night before across portions of the Sierra and NE CA. These storms produced robust outflows with multiple areas of blowing dust and one true haboob/dust storm. We also had flooding that closed a roadway that afternoon/evening along US-395 near the Red Rock area.

Began near Constantia (39.9336, -120.0029).

Source: NOAA Storm Events Database, event 1270616. Narratives are written by the National Weather Service forecast office that issued the report.

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