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Heavy Rain in Lassen County, California
Heavy Rain October 22, 2021 – October 25, 2021 · Lassen County, California
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
CoCoRahs Observers, trained spotters, and Mesonet/ASOS sites reported rainfall amounts ranging from 0.5-3.0 in the area between Janesville to Susanville, CA; 3.0-4.0 in the Westwood to Lake Almanor region; and up to 6.0 about 3.0 mi SSW of Susanville, CA.
Trained spotter in Doyle at an elevation of 4500 feet reported 7.28 inches of rain as of midnight (24 hour period starting 24/0001 LST) with an additional 1.49 inches falling since midnight. The spotter also reported that snow was falling around midnight but not accumulating. Total rainfall amount of 8.77 was reported at this site.
The wider storm
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.
Began near Leavitt (40.5000, -120.5000).
Source: NOAA Storm Events Database, event 987742. Narratives are written by the National Weather Service forecast office that issued the report.
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