From the evening of December 18th through the morning of December 20th  a deep fetch of Pacific moisture was directed into the region. This moisture enhanced along a warm front and produced heavy snow across the mountains of eastern Washington. In the lower elevations the warm front quickly raised snow levels over the eastern Columbia Basin and the valleys of north Idaho limiting snow accumulations to 1 to 3 inches before changing over to rain. In the western Columbia Basin cold air dammed against the Cascades was slow to scrub out and precipitation remained as snow for a longer period resulting in heavy accumulations in the Wenatchee area, the Waterville Plateau and the Okanogan Valley.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 18-DEC-19 21:00:00 to 20-DEC-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer at Lake Wenatchee recorded 17.0 inches of new snow accumulation from this storm.

Heavy Snow in OKANOGAN HIGHLANDS, WASHINGTON
From 18-DEC-19 22:00:00 to 20-DEC-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer at Boyds recorded 4.1 inches of new snow accumulation from this storm.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 19-DEC-19 02:00:00 to 20-DEC-19 05:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The 49 North Ski Resort reported 8 inches of new snow accumulation from this storm.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 19-DEC-19 02:00:00 to 20-DEC-19 05:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer in Newport recorded 4.0 inches of new snow accumulation from this storm.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 19-DEC-19 02:00:00 to 20-DEC-19 05:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer in Metaline Falls reported 5.0 inches of new snow accumulation from this storm.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 19-DEC-19 02:00:00 to 20-DEC-19 05:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer in Evans reported 4.3 inches of new snow accumulation from this storm.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 18-DEC-19 21:00:00 to 20-DEC-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Mazama recorded 19.1 inches of new snow accumulation from this storm.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 18-DEC-19 21:00:00 to 20-DEC-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Plain recorded 13.8 inches of new snow accumulation from this storm.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 18-DEC-19 21:00:00 to 20-DEC-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer at Twisp recorded 6.0 inches of new snow accumulation from this storm.

Heavy Snow in WENATCHEE AREA, WASHINGTON
From 19-DEC-19 06:00:00 to 20-DEC-19 13:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer in the city of Wenatchee recorded  5.6 inches of new snow accumulation from this storm.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 18-DEC-19 21:00:00 to 20-DEC-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Winthrop recorded 6.7 inches of new snow accumulation from this storm.

Heavy Snow in OKANOGAN VALLEY, WASHINGTON
From 18-DEC-19 10:00:00 to 20-DEC-19 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public in 4 miles southeast of Okanogan reported 7.5 inches of new snow accumulation from this storm.

Heavy Snow in WENATCHEE AREA, WASHINGTON
From 19-DEC-19 06:00:00 to 20-DEC-19 13:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer in the city of Wenatchee recorded  5.1 inches of new snow accumulation from this storm.

Heavy Snow in WENATCHEE AREA, WASHINGTON
From 19-DEC-19 06:00:00 to 20-DEC-19 13:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A weather spotter in Entiat reported 6.0 inches of new snow accumulation from this storm.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 18-DEC-19 21:00:00 to 20-DEC-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public 4 miles southwest of Telma reported 28.0 inches of snow accumulation from this storm.

Heavy Snow in OKANOGAN VALLEY, WASHINGTON
From 18-DEC-19 10:00:00 to 20-DEC-19 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public 7 miles south of Molson reported 4.0 inches of new snow accumulation from this storm.

Heavy Snow in WATERVILLE PLATEAU, WASHINGTON
From 18-DEC-19 22:00:00 to 20-DEC-19 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public 2 miles north of East Wenatchee reported 6.0 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 18-DEC-19 21:00:00 to 20-DEC-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer 5 miles southwest of Peshastin recorded 20.0 inches of new snow accumulation from this storm.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 18-DEC-19 21:00:00 to 20-DEC-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Holden Village recorded 38.5 inches of new snow accumulation from this storm system. Residual upslope snow showers slopping over the Cascade crest in the 24 hours after the main storm ended produced a further 10.5 inches of snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 18-DEC-19 21:00:00 to 20-DEC-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Stehekin recorded 43.0 inches of new snow accumulation from this storm. Residual westerly flow upslope snow showers slopping over the Cascade crest produced a further 6.0 inches in the 24 hours after the main storm ended.

Heavy Snow in WENATCHEE AREA, WASHINGTON
From 19-DEC-19 06:00:00 to 20-DEC-19 13:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at the Entiat Fish Hatchery recorded  6.1 inches of new snow accumulation from this storm.

Heavy Snow in WENATCHEE AREA, WASHINGTON
From 19-DEC-19 06:00:00 to 20-DEC-19 13:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public 8 miles west of Cashmere reported 8.0 inches of new snow accumulation from this storm.

Heavy Snow in OKANOGAN VALLEY, WASHINGTON
From 18-DEC-19 10:00:00 to 20-DEC-19 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A weather spotter in Omak reported 5.0 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 18-DEC-19 21:00:00 to 20-DEC-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at the Leavenworth Fish Hatchery recorded 17.3 inches of new snow accumulation from this storm.

Heavy Snow in OKANOGAN VALLEY, WASHINGTON
From 18-DEC-19 10:00:00 to 20-DEC-19 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public in Okanogan reported 6.0 inches of new snow accumulation from this storm.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 19-DEC-19 02:00:00 to 20-DEC-19 05:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public in Deer Park reported 5.0 inches of new snow accumulation from this storm.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 19-DEC-19 02:00:00 to 20-DEC-19 05:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public in Usk reported 7.0 inches of new snow accumulation from this storm.