The third week of January brought very active winter weather to the Inland Northwest as a series of surface low pressures tracked along a stalled arctic air mass boundary laying near or over eastern Washington and north Idaho. Occasional feeds of Pacific moisture directed into this storm track lead to periodic heavy accumulations of snow across the region through the week. During the whole week of repeated snow storms many northern valley locations received 2 to 3 feet of snow accumulation with some mountain ski resorts reporting 4 to 5 feet of fresh powder.
The first surface low pressure system tracked through northern Washington and Idaho on January 10th and 11th. A stationary front followed by a cold front produced a  period of accumulating snow across the region.

Heavy Snow in CENTRAL PANHANDLE MOUNTAINS, IDAHO
From 10-JAN-20 12:00:00 to 11-JAN-20 22:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Kellogg recorded 4.6 inches of new snow accumulation.

Heavy Snow in CENTRAL PANHANDLE MOUNTAINS, IDAHO
From 10-JAN-20 12:00:00 to 11-JAN-20 22:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Prichard recorded 6.6 inches of new snow accumulation.

Heavy Snow in CENTRAL PANHANDLE MOUNTAINS, IDAHO
From 10-JAN-20 12:00:00 to 11-JAN-20 22:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Wallace recorded 9.7 inches of new snow accumulation.

Heavy Snow in CENTRAL PANHANDLE MOUNTAINS, IDAHO
From 10-JAN-20 12:00:00 to 11-JAN-20 22:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The Lookout Pass Ski Resort reported 19 inches of new snow accumulation.

Heavy Snow in NORTHERN PANHANDLE, IDAHO
From 10-JAN-20 11:00:00 to 11-JAN-20 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The Schweitzer Mountain Ski Resort reported 13 inches of new snow from this storm.

Heavy Snow in COEUR D'ALENE AREA, IDAHO
From 10-JAN-20 13:00:00 to 11-JAN-20 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer at Rathdrum recorded 11.8 inches of new snow accumulation.

Heavy Snow in IDAHO PALOUSE, IDAHO
From 10-JAN-20 12:00:00 to 11-JAN-20 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An Observer near Moscow recorded 9.0 inches of new snow accumulation.

Heavy Snow in COEUR D'ALENE AREA, IDAHO
From 10-JAN-20 13:00:00 to 11-JAN-20 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public in Coeur D'Alene reported 6.5 inches of new snow accumulation.

Heavy Snow in COEUR D'ALENE AREA, IDAHO
From 10-JAN-20 13:00:00 to 11-JAN-20 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

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

Heavy Snow in COEUR D'ALENE AREA, IDAHO
From 10-JAN-20 13:00:00 to 11-JAN-20 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

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

Heavy Snow in IDAHO PALOUSE, IDAHO
From 10-JAN-20 12:00:00 to 11-JAN-20 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

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

Heavy Snow in NORTHERN PANHANDLE, IDAHO
From 10-JAN-20 11:00:00 to 11-JAN-20 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A weather spotter near Ponderay reported 4.5 inches of new snow from this storm.

Heavy Snow in COEUR D'ALENE AREA, IDAHO
From 10-JAN-20 13:00:00 to 11-JAN-20 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A weather spotter 5 miles north of Rathdrum reported 8.7 inches of new snow accumulation.

Heavy Snow in NORTHERN PANHANDLE, IDAHO
From 10-JAN-20 11:00:00 to 11-JAN-20 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A weather spotter near Blanchard reported 7.5 inches of new snow from this storm.

Heavy Snow in NORTHERN PANHANDLE, IDAHO
From 10-JAN-20 11:00:00 to 11-JAN-20 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public near Dover reported 7.0 inches of new snow accumulation from this storm.

Heavy Snow in IDAHO PALOUSE, IDAHO
From 10-JAN-20 12:00:00 to 11-JAN-20 02:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A weather spotter near Moscow reported 6.0 inches of new snow accumulation with drifting snow noted on the exposed terrain around the area.

Heavy Snow in NORTHERN PANHANDLE, IDAHO
From 10-JAN-20 11:00:00 to 11-JAN-20 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A weather spotter near Moyie Springs reported 4.5 inches of new snow from this storm.

Heavy Snow in CENTRAL PANHANDLE MOUNTAINS, IDAHO
From 10-JAN-20 12:00:00 to 11-JAN-20 22:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer near St. Maries recorded 8.8 inches of new snow accumulation.