Flash Flood — Lassen, California

2021-10-24 · near Doyle, Lassen, California

Event narrative

California Highway Patrol reported 3.5 feet of water over the road on the north end of Constantia Road making the roadway impassable.

Wider weather episode

A strong atmospheric river event produced a major heavy rain, high wind, and high elevation snow event for much of the region. Record-setting rainfall amounts for many areas of the Sierra into western Nevada. NWS Reno received multiple reports of mud and rock slides in the Sierra along I-80 near the summit, and CA 70 and CA 89 in Sierra, Plumas, and Lassen Counties.

View location on OpenStreetMap → (40.0108, -120.0980)

Source: NOAA Storm Events Database, event_id 987334. Narrative written by the NWS forecast office that issued the report.