A moist warm front overran cold air trapped against the Cascades during the early morning hours of January 27th. Heavy snow accumulations in the Wenatchee area and on the Waterville Plateau resulted. Moderate accumulations of 2 to 4 inches of snow were noted in the Okanogan Valley as well as the mountains and valleys of northeast Washington.
In the Cascades, the southern valleys south of Lake Chelan received heavy snow accumulations with 8 to 10 inches in the Wenatchee River and Entiat River Valleys. This heavy wet snow toppled trees and produced scattered power outages in the upper Wenatchee Valley. Areas north of Lake Chelan received moderate amounts of snow in the 4 to 6 inch range, which is below heavy snow criteria and not unusual for winter in these valleys.
A following cold front ended the precipitation by dawn in the Cascades, but then strong post frontal winds developed over the area. A wind sensor on Mission Peak at 6730 feet elevation recorded a westerly gust of 110 mph. Some of these high winds aloft descended down the east slopes of the Cascades and channeled through the Wenatchee Valley and produced damage in the Wenatchee area during the afternoon hours.

Heavy Snow in WATERVILLE PLATEAU, WASHINGTON
From 27-JAN-18 01:00:00 to 27-JAN-18 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public near Waterville reported 4.0 inches of new snow accumulation. The COOP observer at Chief Joseph Dam just north of the sparsely populated Waterville Plateau recorded 4.7 inches of new snow accumulation.

Heavy Snow in WENATCHEE AREA, WASHINGTON
From 27-JAN-18 00:00:00 to 27-JAN-18 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter near Manson reported 6.0 inches of new snow accumulation.

Heavy Snow in WENATCHEE AREA, WASHINGTON
From 27-JAN-18 00:00:00 to 27-JAN-18 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Multiple reports on social media indicated accumulations of 4 to 5 inches of snow in the East Wenatchee area.

Heavy Snow in WENATCHEE AREA, WASHINGTON
From 27-JAN-18 00:00:00 to 27-JAN-18 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

An observer 5 miles south of Wenatchee  reported 4.2 inches of new snow accumulation.

Heavy Snow in WENATCHEE AREA, WASHINGTON
From 27-JAN-18 00:00:00 to 27-JAN-18 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at the Entiat Fish Hatchery recorded 6.6 inches of new snow accumulation.

Heavy Snow in WENATCHEE AREA, WASHINGTON
From 27-JAN-18 00:00:00 to 27-JAN-18 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Chelan reported 5.0 inches of new snow accumulation.

High Wind in WENATCHEE AREA, WASHINGTON
From 27-JAN-18 14:00:00 to 27-JAN-18 17:00:00 (PST-8)
Magnitude: 70.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Newspaper

The Wenatchee World Newspaper reported numerous trees downed by strong wind gusts in and around Wenatchee between 3 pm and 5 pm. At least two large trees fell on houses in Wenatchee and East Wenatchee and numerous power lines were taken out by falling trees.

High Wind in WENATCHEE AREA, WASHINGTON
From 27-JAN-18 14:00:00 to 27-JAN-18 17:00:00 (PST-8)
Magnitude: 70.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Newspaper

The Wenatchee World Newspaper reported numerous trees downed by strong wind gusts in and around Wenatchee between 3 pm and 5 pm. At least two large trees fell on houses in Wenatchee and East Wenatchee and numerous power lines were taken out by falling trees.

High Wind in WENATCHEE AREA, WASHINGTON
From 27-JAN-18 14:00:00 to 27-JAN-18 17:00:00 (PST-8)
Magnitude: 70.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Utility Company

Chelan County Public Utilities reported wind related power outages affecting up to 2000 residents in the Wenatchee area.