Flash Flood — Nevada, California

2021-10-24 · near Soda Spgs, Nevada, California

Event narrative

California Highway Patrol reported ton of rocks and water come off the mountain side of old 40, (Donner Pass Rd between Truckee and Donner Summit.) the road is now closed as it is not safe to pass due to erosion and falling debris.

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 → (39.3300, -120.3100)

Source: NOAA Storm Events Database, event_id 987335. Narrative written by the NWS forecast office that issued the report.