During the afternoon of January 23rd a warm front formed over eastern Washington and North Idaho fed by a deep and favorably directed fetch of Pacific moisture. The front became stationary and produced a 24 to 36 hour period of light to moderate snow impacting the mountains and valleys of the Cascades and northeastern Washington. The Okanogan Valley also received heavy snow from this storm system. The Columbia Basin was in the warm sector of this storm system and received mostly rain with 2 to 5 inches of wet snow noted in the far western basin near the Cascades and on the Waterville Plateau.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 23-JAN-18 14:00:00 to 25-JAN-18 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Boundary Dam reported 6.0 inches of new snow accumulation.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 23-JAN-18 14:00:00 to 25-JAN-18 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Boundary Dam reported 6.0 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Leavenworth reported 10.0 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Leavenworth reported 10.0 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer near Ardenvoir reported 6.5 inches of new snow accumulation.

Heavy Snow in OKANOGAN HIGHLANDS, WASHINGTON
From 23-JAN-18 12:00:00 to 24-JAN-18 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public near Chesaw reported 10.0 inches of new snow accumulation.

Heavy Snow in OKANOGAN HIGHLANDS, WASHINGTON
From 23-JAN-18 12:00:00 to 24-JAN-18 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public near Chesaw reported 10.0 inches of new snow accumulation.

Heavy Snow in OKANOGAN HIGHLANDS, WASHINGTON
From 23-JAN-18 12:00:00 to 24-JAN-18 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer near Boyds reported 7.0 inches of new snow accumulation.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 23-JAN-18 14:00:00 to 25-JAN-18 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer near Clayton reported 7.0 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

An observer at Lake Wenatchee State Park reported 10.6 inches of new snow accumulation.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 23-JAN-18 14:00:00 to 25-JAN-18 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter 8 miles southeast of Northport reported 5.2 inches of new snow accumulation.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 23-JAN-18 14:00:00 to 25-JAN-18 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public 6 miles west of Orin reported 8.0 inches of new snow accumulation.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 23-JAN-18 14:00:00 to 25-JAN-18 02:00:00 (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.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 23-JAN-18 14:00:00 to 25-JAN-18 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public near Loon Lake reported 7.5 inches of new snow accumulation.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 23-JAN-18 14:00:00 to 25-JAN-18 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A weather spotter 7 miles northwest of Diamond Lake reported 6.2 inches of new snow accumulation.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 23-JAN-18 14:00:00 to 25-JAN-18 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer near Metaline Falls reported 5.5 inches of new snow accumulation.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 23-JAN-18 14:00:00 to 25-JAN-18 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The 49 North ski area reported 24.0 inches of new snow accumulation.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 23-JAN-18 14:00:00 to 25-JAN-18 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The Mt. Spokane ski area reported 16.0 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Holden Village recorded 13.3 inches of new snow accumulation.

Heavy Snow in OKANOGAN VALLEY, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A member of the public near Brewster reported 4.0 inches of new snow accumulation.

Heavy Snow in OKANOGAN VALLEY, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A weather spotter near Pateros reported 6.0 inches of new snow accumulation.

Heavy Snow in OKANOGAN VALLEY, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A member of the public near Riverside reported 6.0 inches of new snow accumulation.

Heavy Snow in OKANOGAN HIGHLANDS, WASHINGTON
From 23-JAN-18 12:00:00 to 24-JAN-18 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer 4 miles north of Republic reported 7.0 inches of new snow accumulation.

Heavy Snow in NORTHEAST MOUNTAINS, WASHINGTON
From 23-JAN-18 14:00:00 to 25-JAN-18 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public near Springdale reported 4.5 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Stehekin recorded 11.0 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Winthrop recorded 7.5 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Mazama recorded 7.5 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Plain recorded 8.6 inches of new snow accumulation.

Heavy Snow in OKANOGAN HIGHLANDS, WASHINGTON
From 23-JAN-18 12:00:00 to 24-JAN-18 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Republic reported 6.0 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public near Telma reported 8.5 inches of new snow accumulation.

Heavy Snow in OKANOGAN VALLEY, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Chief Joseph Dam recorded 5.5 inches of new snow accumulation.

Heavy Snow in EAST SLOPES NORTHERN CASCADES, WASHINGTON
From 23-JAN-18 10:00:00 to 24-JAN-18 04:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public near Leavenworth reported 8.0 inches of new snow accumulation.