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.

Heavy Rain in EL DORADO, CALIFORNIA
From 06-DEC-19 17:51:00 to 08-DEC-19 17:51:00 (PST-8)
Location: MEYERS
Reported by: RAWS

RAWS RWBC1 1 mile west-southwest of Meyers reported 2.15 inches of rainfall in a 48-hour period from 6 December 1751PST to 8 December 1751PST at an elevation of 6336 feet MSL.

Heavy Rain in LASSEN, CALIFORNIA
From 06-DEC-19 17:00:00 to 08-DEC-19 17:00:00 (PST-8)
Location: SUSANVILLE
Reported by: Trained Spotter

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.

Heavy Rain in EL DORADO, CALIFORNIA
From 06-DEC-19 07:00:00 to 08-DEC-19 07:00:00 (PST-8)
Location: POMINS
Reported by: COOP Observer

CO-OP Observer station TAAC1 in Tahoma reported 1.98 inches of rainfall in a 48-hour period from 6 December 0700PST to 8 December 0700PST at an elevation of 6315 feet MSL.

Heavy Snow in GREATER LAKE TAHOE AREA, CALIFORNIA
From 06-DEC-19 19:00:00 to 08-DEC-19 08:00:00 (PST-8)
Reported by: Public

Northstar Ski Resort reported 18 inches of snowfall at an elevation of 6868 feet MSL in a 37-hour period from late on the 6th through the morning of the 8th.

Heavy Snow in MONO, CALIFORNIA
From 07-DEC-19 00:00:00 to 08-DEC-19 08:00:00 (PST-8)
Reported by: Public

Mammoth Mountain Ski Resort reported 24 inches of snowfall in a 32-hour period from early on the 7th through the morning of the 8th at an elevation of 8900 feet MSL.

Heavy Snow in MONO, CALIFORNIA
From 08-DEC-19 00:00:00 to 08-DEC-19 05:00:00 (PST-8)
Reported by: Trained Spotter

Trained weather spotter 1 mile southwest of Toms Place reported 7.5 inches of snowfall in a 5-hour period between midnight and 0500PST on the 8th at an elevation of 7199 feet MSL.

Heavy Snow in GREATER LAKE TAHOE AREA, CALIFORNIA
From 06-DEC-19 19:00:00 to 08-DEC-19 08:00:00 (PST-8)
Reported by: Public

Heavenly Ski Resort reported 15 inches of snowfall at an elevation of 7499 feet MSL in a 37-hour period from late on the 6th through the morning of the 8th.

Heavy Snow in GREATER LAKE TAHOE AREA, CALIFORNIA
From 06-DEC-19 19:00:00 to 08-DEC-19 08:00:00 (PST-8)
Reported by: Public

Alpine Meadows Ski Resort reported 14 inches of snowfall at an elevation of 6200 feet and 23 inches at an elevation of 8000 feet MSL in a 37-hour period from late on the 6th through the morning of the 8th.

Heavy Snow in GREATER LAKE TAHOE AREA, CALIFORNIA
From 06-DEC-19 19:00:00 to 08-DEC-19 08:00:00 (PST-8)
Reported by: Public

Squaw Valley Ski Resort reported 9 inches of snowfall at an elevation of 6200 feet MSL and 24 inches at an elevation of 8000 feet MSL in a 37-hour period from late on the 6th through the morning of the 8th.

Heavy Rain in ALPINE, CALIFORNIA
From 07-DEC-19 17:48:00 to 08-DEC-19 17:48:00 (PST-8)
Location: MARKLEEVILLE
Reported by: Mesonet

Mesonet station MKEC1 in Markleeville reported 1.01 inches of rainfall in a 24-hour period from 7 December 1748PST to 8 December 1748PST at an elevation of 5501 feet MSL.

Heavy Rain in LASSEN, CALIFORNIA
From 06-DEC-19 08:00:00 to 08-DEC-19 08:00:00 (PST-8)
Location: JOHNSTONVILLE
Reported by: Trained Spotter

Trained weather spotter 6 miles south-southeast of Susanville reported 3.00 inches of rainfall in a 48-hour period from 6 December 0800PST to 8 December 0800PST at an elevation of 4823 feet MSL.

Heavy Rain in LASSEN, CALIFORNIA
From 06-DEC-19 11:00:00 to 08-DEC-19 11:00:00 (PST-8)
Location: SUSANVILLE
Reported by: COOP Observer

CO-OP Observer station SNVC1 1 mile west-northwest of Susanville reported 2.25 inches of rainfall in a 48-hour period from 6 December 1100PST to 8 December 1100PST at an elevation of 4184 feet MSL.

Heavy Rain in MONO, CALIFORNIA
From 06-DEC-19 17:53:00 to 08-DEC-19 17:53:00 (PST-8)
Location: CRESTVIEW
Reported by: RAWS

RAWS CRVC1 near Crestview reported 1.86 inches of rainfall in a 48-hour period from 6 December 1753PST to 8 December 1753PST at an elevation of 7570 feet MSL.

Heavy Rain in NEVADA, CALIFORNIA
From 07-DEC-19 07:49:00 to 08-DEC-19 07:49:00 (PST-8)
Location: (TRK)TRUCKEE/TAHOE A
Reported by: COOP Observer

CO-OP Observer station TRK at Truckee-Tahoe Airport reported 1.71 inches of rainfall in a 24-hour period from 7 December 0749PST to 8 December 0749PST at an elevation of 5900 feet MSL. The rain was mixed with very wet snow. 3 inches of snowfall was also recorded during this time period.

Heavy Rain in NEVADA, CALIFORNIA
From 06-DEC-19 08:00:00 to 08-DEC-19 08:00:00 (PST-8)
Location: BOCA
Reported by: COOP Observer

CO-OP Observer station BOCC1 1 mile south-southwest of Boca Reservoir reported 1.95 inches of rainfall in a 48-hour period from 6 December 0800PST to 8 December 0800PST at an elevation of 5575 feet MSL.

Heavy Rain in NEVADA, CALIFORNIA
From 06-DEC-19 20:15:00 to 08-DEC-19 20:15:00 (PST-8)
Location: FLONSTON
Reported by: COOP Observer

CO-OP Observer station FARC1 2 miles north-northwest of Floriston reported 2.64 inches of rainfall in a 48-hour period from 6 December 2015PST to 8 December 2015PST.

Heavy Rain in PLACER, CALIFORNIA
From 07-DEC-19 20:19:00 to 08-DEC-19 20:19:00 (PST-8)
Location: HOMEWOOD
Reported by: RAWS

RAWS HDMC1 in Homewood reported 1.71 inches of rainfall in a 48-hour period from 6 December 2019PST to 8 December 2019PST at an elevation of 7121 feet MSL.

Heavy Rain in PLACER, CALIFORNIA
From 07-DEC-19 09:07:00 to 08-DEC-19 09:07:00 (PST-8)
Location: TAHOE CITY
Reported by: COOP Observer

CO-OP Observer station TAHC1 in Tahoe City reported 1.16 inches of rainfall in a 24-hour period from 7 December 0907PST to 8 December 0907PST at an elevation of 6230 feet MSL. 2 inches of snowfall was also reported during this time period.

Heavy Rain in PLUMAS, CALIFORNIA
From 06-DEC-19 19:59:00 to 08-DEC-19 19:59:00 (PST-8)
Location: BECKWOURTH
Reported by: RAWS

RAWS CYVC1 6 miles north-northeast of Lake Davis reported 1.76 inches of rainfall in a 48-hour period from 6 December 1959PST to 8 December 1959PST at an elevation of 5570 feet MSL.