Heavy Rain in Lassen County, California

Trained weather spotter 5 miles west-northwest of Susanville reported 2.53 inches of rainfall in a 48-hour period from 6 December 1700PST to 8 December 1700PST at an elevation of 5072 feet MSL. Spotter also reported receiving 2.75 inches of wet snowfall during this period.

An atmospheric river associated with a large mid-latitude cyclone brought heavy rainfall and snowfall to the Sierra Nevada over the course of three days. Liquid totals were between 2 and 3 inches from central Lassen County south along the Sierra Crest west of Lake Tahoe and into Mono County, with 1 to 2 inches across much of the Lake Tahoe Basin and Alpine County. Snowfall totals were generally 4 inches or less across the Lake Tahoe Basin and northeast California below 5500 feet; 4 to 8 inches fell up to 7000 feet west of Lake Tahoe and in higher elevations of northeast California. In the Sierra above 7000 feet, snow accumulations ranged from 1 to 2 feet, with a few locations receiving up to 30 inches.