A deep shortwave trough over the eastern Pacific moved on shore the 5th and then spread through the Sierra Nevada and northeastern California the 6th into the 7th. This system brought localized high winds and heavy snowfall to the Sierra Nevada and northeastern California through the 7th.

Heavy Snow in LASSEN/EASTERN PLUMAS/EASTERN SIERRA, CALIFORNIA
From 06-JAN-19 20:39:00 to 07-JAN-19 20:39:00 (PST-8)
Reported by: Trained Spotter

Trained weather spotter, 5 miles west-northwest of Susanville reported 14 inches of snowfall at an elevation of 5200 feet MSL in a 24 hour period from 5 January 2039PST to 6 January 2039PST.

Heavy Snow in MONO, CALIFORNIA
From 06-JAN-19 07:00:00 to 07-JAN-19 07:00:00 (PST-8)
Reported by: Public

Mammoth Mountain Ski Resort reported 18 inches of snowfall at an elevation of 8909 feet MSL in a 24 hour period from 6 January 0700PST to 7 January 0700PST.

Heavy Snow in MONO, CALIFORNIA
From 06-JAN-19 07:00:00 to 07-JAN-19 07:00:00 (PST-8)
Reported by: Trained Spotter

Trained weather spotter, 1 mile southwest of Toms Place reported 5 inches of snowfall in a 24 hour period from 6 January 0700PST to 7 January 0700PST.

Heavy Snow in MONO, CALIFORNIA
From 06-JAN-19 07:00:00 to 07-JAN-19 07:00:00 (PST-8)
Reported by: Public

June Mountain Ski Area reported 18 to 24 inches of snowfall at an elevation of 7545 feet MSL in a 24 hour period from 6 January 0700PST to 7 January 0700PST.

Heavy Snow in LASSEN/EASTERN PLUMAS/EASTERN SIERRA, CALIFORNIA
From 06-JAN-19 10:00:00 to 07-JAN-19 10:00:00 (PST-8)
Reported by: Trained Spotter

A trained weather spotter in Portola reported 15 inches of snowfall at an elevation of 4848 feet MSL in a 24 hour period from 6 January 1000PST to 7 January 1000PST.

Heavy Snow in GREATER LAKE TAHOE AREA, CALIFORNIA
From 06-JAN-19 05:00:00 to 07-JAN-19 08:00:00 (PST-8)
Reported by: Public

Snowfall amounts between 14.5 and 18 inches fell near and west of California Highway 89 between the 6th and 7th, with 22 to 29 inches falling above 7000 feet. Below 7000 feet east of California Highway 89 and south of Interstate 80, between 7.5 and 26 inches of snow fell. South of US Highway 50, 4.5 inches of snow fell at Meyers and a foot of snow fell at Heavenly Ski Resort. Interstate 80 was closed from Colfax to the Nevada State line between 1345PST on the 6th and 0700PST on the 7th due to low visibility and heavy snow. California Highway 89 closed on the west shore of Lake Tahoe with California Highway 88 closed over Carson Pass.

High Wind in GREATER LAKE TAHOE AREA, CALIFORNIA
From 06-JAN-19 20:53:00 to 06-JAN-19 20:54:00 (PST-8)
Magnitude: 55.00 MG
Reported by: ASOS

ASOS TVL, South Lake Tahoe Airport measured a 63 mph wind gust. Elevation 6264 feet MSL.

High Wind in MONO, CALIFORNIA
From 06-JAN-19 20:55:00 to 06-JAN-19 20:56:00 (PST-8)
Magnitude: 62.00 MG
Reported by: AWOS

AWOS MMH, Mammoth Yosemite Airport reported a 71 mph wind gust. Elevation 7129 feet MSL.

Heavy Snow in MONO, CALIFORNIA
From 06-JAN-19 07:00:00 to 07-JAN-19 07:00:00 (PST-8)
Reported by: CoCoRaHS

CoCoRaHS station CA-MN-1, 3 miles south of Conway Summit reported 4 inches of snowfall in a 24 hour period from 6 January 0700PST to 7 January 0700PST.

Heavy Snow in MONO, CALIFORNIA
From 06-JAN-19 07:00:00 to 07-JAN-19 07:00:00 (PST-8)
Reported by: CoCoRaHS

CoCoRaHS station CA-MN-4, 4 miles southeast of Toms Place reported 5 inches of snowfall in a 24 hour period from 6 January 0700PST to 7 January 0700PST.

Heavy Snow in LASSEN/EASTERN PLUMAS/EASTERN SIERRA, CALIFORNIA
From 06-JAN-19 07:00:00 to 07-JAN-19 07:00:00 (PST-8)
Reported by: CoCoRaHS

CoCoRaHS station CA-LS-1, 3 miles south-southwest of Susanville reported 4 inches of snowfall in a 24 hour period from 6 January 0700PST to 7 January 0700PST.

Heavy Snow in LASSEN/EASTERN PLUMAS/EASTERN SIERRA, CALIFORNIA
From 06-JAN-19 08:15:00 to 07-JAN-19 08:15:00 (PST-8)
Reported by: CoCoRaHS

CoCoRaHS station CA-PM-9, 3 miles east of Beckwourth reported 6.5 inches of snowfall in a 24 hour period from 6 January 0815PST to 7 January 0815PST.

Heavy Snow in LASSEN/EASTERN PLUMAS/EASTERN SIERRA, CALIFORNIA
From 05-JAN-19 18:45:00 to 06-JAN-19 18:45:00 (PST-8)
Reported by: Trained Spotter

Trained weather spotter 5 miles west-northwest of Susanville reported 13 inches of snowfall at an elevation of 5072 feet MSL in a 24 hour period from 5 January 1845PST to 6 January 1845PST.

Heavy Snow in LASSEN/EASTERN PLUMAS/EASTERN SIERRA, CALIFORNIA
From 06-JAN-19 07:00:00 to 07-JAN-19 07:00:00 (PST-8)
Reported by: CoCoRaHS

CoCoRaHS station CA-SI-2, 1 mile southwest of Sierraville reported 10 inches of snowfall in a 24 hour period from 6 January 0700PST to 7 January 0700PST.

Heavy Snow in LASSEN/EASTERN PLUMAS/EASTERN SIERRA, CALIFORNIA
From 06-JAN-19 08:55:00 to 07-JAN-19 08:55:00 (PST-8)
Reported by: COOP Observer

CO-OP Observer station VERC1, 2 miles west of Verdi reported 13 inches of snowfall in a 24 hour period from 6 January 0855PST to 7 January 0855PST.