Issued: 1:45 PM PST Saturday, November 27, 2021
by Dallas Glass

Jump to: Weather Forecast I Precipitation I Snow Level I 5000' Temps I Ridgeline Winds I Extended Weather

Weather Synopsis

Warm, wet, and windy conditions will continue in the mountains for the next several days as an atmospheric river remains focused on the Pacific Northwest. Slight shifts in the storm could allow certain locations brief breaks from the action, but make no mistake, every area will be impacted by this event. Moderate to heavy precipitation and strong winds will continue to spread south Saturday afternoon and evening. As the brunt of the storm slams into the region, rain will easily spill over the Cascade crest and reach mountains further east. Snow levels overnight should peak around 8500-10000 ft. The heaviest rain and strongest winds should occur in the northern half of the forecast area, including locations near the Mt Loop Highway, Mt Baker, and Washington Pass.

During the day Sunday, the major axis of precipitation drifts back toward the Canadian border where conditions will remain wet and mild. Areas further south and east should see significantly less precipitation and could even experience some breaks in the clouds. Cooler air will allow snow levels to lower slightly, however, any snow should remain confined to areas above treeline. 

By Sunday night some uncertainty enters the forecast as a short-wave trough tries to reinvigorate rain and snow shower activity. Precipitation should increase for locations from the Mountain Loop Highway to Highway 12 (White Pass). Westerly winds and plenty of moisture, will help showers continue to stack up on the west slopes of the Cascades. This pattern lingers into Monday as the weak through finally crosses the region and allows rain and snow showers to decrease by late afternoon. 

 

Weather Forecast

Olympics
West North
West Central
West South
Stevens Pass
Snoqualmie Pass
East North
East Central
East South
Mt. Hood
Use dropdown to select your zone
Saturday Night Stormy. Periods of heavy rain and strong SW winds.
Sunday Moderate to heavy rain and snow, becoming showers in the afternoon. Moderate to strong winds becoming W and decreasing in the afternoon.
Saturday Night Very stormy. Heavy rain and strong SSW winds.
Sunday Stormy. Periods of heavy rain and high elevation snow. Strong SW winds becoming W and decreasing in the afternoon.
Saturday Night Very stormy. Heavy rain and strong SW winds.
Sunday Stormy. Periods of heavy rain and very high elevation snow. Strong WSW winds decreasing slightly in the afternoon.
Saturday Night Rain, heaviest near the volcanoes. Locally moderate to heavy showers elsewhere. Strong WSW winds.
Sunday Cloudy. Scattered showers mostly near Mt Rainier. Moderate to strong WSW winds decreasing slightly in the afternoon.
Saturday Night Moderate to heavy rain with moderate to strong WSW winds increasing slightly overnight. Light E flow at pass level ending.
Sunday Periods of moderate rain and very high elevation snow. Strong WSW winds decreasing in the afternoon.
Saturday Night Moderate to heavy rain with strong WSW winds. Light E flow ending overnight.
Sunday Showers with periods of moderate rain. Strong WSW winds decreasing in the afternoon.
Saturday Night Moderate to heavy rain with SW winds becoming strong overnight.
Sunday Scattered showers with rain and high elevation snow. Strong W winds decreasing in the afternoon.
Saturday Night Rain, heaviest near the crest, with moderate rain showers further east. Strong WSW winds increasing overnight.
Sunday Scattered showers, heaviest near the crest. Strong W winds decreasing in the afternoon.
Saturday Night Rain, heaviest near the crest, with moderate rain showers further east. Strong WSW winds increasing overnight.
Sunday Scattered showers, heaviest near the crest. Strong W winds decreasing in the afternoon.
Saturday Night Occasionally moderate to heavy rain developing overnight. Strong WSW winds increasing.
Sunday Mostly cloudy with the slight chance of an isolated shower in the morning. Strong W winds decreasing slightly in the afternoon.

Precipitation (in)

Saturday Night Sunday Sunday Night Monday
4 pm - 4 am 4 am - 4 pm 4 pm - 4 am 4 am - 4 pm
Hurricane Ridge 0.75 -1.00 0.50 - 0.75 LT 0.25 LT 0.10
Mt Baker Ski Area 2.00 1.00 - 1.50 0.50 0.25
Mt. Loop - Barlow Pass 2.00 - 2.50 1.00 - 1.50 0.50 0.25 - 0.50
Stevens Pass 1.00 - 1.50 0.50 - 0.75 0.50 - 0.75 0.25
Snoqualmie Pass 1.00 - 1.50 0.50 0.50 - 0.75 0.25 - 0.50
Crystal Mt 0.25 - 0.50 LT 0.10 0.25 0.25
Paradise 1.50 0.25 - 0.50 1.00 0.50
White Pass 0.50 LT 0.10 0.25 - 0.50 0.25
Washington Pass 1.00 - 1.50 0.50 LT 0.25 LT 0.25
Mission Ridge 0.25 LT 0.10 LT 0.25 LT 0.10
Salmon la Sac - Gallagher Head 0.75 -1.00 0.25 0.25 - 0.50 LT 0.25
Tieton River - Darland Mt. 0.25 - 0.50 0 LT 0.25 LT 0.25
Mt Hood Meadows 0.50 - 0.75 0 LT 0.10 LT 0.25
Timberline 0.50 - 0.75 0 LT 0.10 0.25
Hurricane Ridge Precipitation (in)
Saturday Night 0.75 -1.00
Sunday 0.50 - 0.75
Sunday Night LT 0.25
Monday LT 0.10
Mt Baker Ski Area Precipitation (in)
Saturday Night 2.00
Sunday 1.00 - 1.50
Sunday Night 0.50
Monday 0.25
Mt. Loop - Barlow Pass Precipitation (in)
Saturday Night 2.00 - 2.50
Sunday 1.00 - 1.50
Sunday Night 0.50
Monday 0.25 - 0.50
Stevens Pass Precipitation (in)
Saturday Night 1.00 - 1.50
Sunday 0.50 - 0.75
Sunday Night 0.50 - 0.75
Monday 0.25
Snoqualmie Pass Precipitation (in)
Saturday Night 1.00 - 1.50
Sunday 0.50
Sunday Night 0.50 - 0.75
Monday 0.25 - 0.50
Crystal Mt Precipitation (in)
Saturday Night 0.25 - 0.50
Sunday LT 0.10
Sunday Night 0.25
Monday 0.25
Paradise Precipitation (in)
Saturday Night 1.50
Sunday 0.25 - 0.50
Sunday Night 1.00
Monday 0.50
White Pass Precipitation (in)
Saturday Night 0.50
Sunday LT 0.10
Sunday Night 0.25 - 0.50
Monday 0.25
Washington Pass Precipitation (in)
Saturday Night 1.00 - 1.50
Sunday 0.50
Sunday Night LT 0.25
Monday LT 0.25
Mission Ridge Precipitation (in)
Saturday Night 0.25
Sunday LT 0.10
Sunday Night LT 0.25
Monday LT 0.10
Salmon la Sac - Gallagher Head Precipitation (in)
Saturday Night 0.75 -1.00
Sunday 0.25
Sunday Night 0.25 - 0.50
Monday LT 0.25
Tieton River - Darland Mt. Precipitation (in)
Saturday Night 0.25 - 0.50
Sunday 0
Sunday Night LT 0.25
Monday LT 0.25
Mt Hood Meadows Precipitation (in)
Saturday Night 0.50 - 0.75
Sunday 0
Sunday Night LT 0.10
Monday LT 0.25
Timberline Precipitation (in)
Saturday Night 0.50 - 0.75
Sunday 0
Sunday Night LT 0.10
Monday 0.25

Snow Level (ft)

Saturday Evening* Saturday Night Sunday Morning Sunday Afternoon Sunday Evening Sunday Night
Olympics 9500' 9000' 7500' 7000' 7000' 6500'
West North 8500' 8000' 7000' 6500' 6000' 6000'
West Central 9000' 8500' 7500' 7000' 6500' 6500'
West South 9500' 7500' 7000' 7500' 7000' 6500'
Stevens Pass 9000' 8000' 7500' 7500' 7000' 7000'
Snoqualmie Pass 9500' 8000' 7500' 7500' 7000' 7000'
East North 8500' 8500' 7500' 6500' 6000' 5500'
East Central 9500' 8000' 7500' 7500' 7000' 7000'
East South 9500' 7500' 7000' 7500' 7500' 7500'
Mt. Hood 10000' 8000' 7000' 6500' 6000' 6000'
Olympics Elevation
Saturday Evening* 9500'
Saturday Night 9000'
Sunday Morning 7500'
Sunday Afternoon 7000'
Sunday Evening 7000'
Sunday Night 6500'
West North Elevation
Saturday Evening* 8500'
Saturday Night 8000'
Sunday Morning 7000'
Sunday Afternoon 6500'
Sunday Evening 6000'
Sunday Night 6000'
West Central Elevation
Saturday Evening* 9000'
Saturday Night 8500'
Sunday Morning 7500'
Sunday Afternoon 7000'
Sunday Evening 6500'
Sunday Night 6500'
West South Elevation
Saturday Evening* 9500'
Saturday Night 7500'
Sunday Morning 7000'
Sunday Afternoon 7500'
Sunday Evening 7000'
Sunday Night 6500'
Stevens Pass Elevation
Saturday Evening* 9000'
Saturday Night 8000'
Sunday Morning 7500'
Sunday Afternoon 7500'
Sunday Evening 7000'
Sunday Night 7000'
Snoqualmie Pass Elevation
Saturday Evening* 9500'
Saturday Night 8000'
Sunday Morning 7500'
Sunday Afternoon 7500'
Sunday Evening 7000'
Sunday Night 7000'
East North Elevation
Saturday Evening* 8500'
Saturday Night 8500'
Sunday Morning 7500'
Sunday Afternoon 6500'
Sunday Evening 6000'
Sunday Night 5500'
East Central Elevation
Saturday Evening* 9500'
Saturday Night 8000'
Sunday Morning 7500'
Sunday Afternoon 7500'
Sunday Evening 7000'
Sunday Night 7000'
East South Elevation
Saturday Evening* 9500'
Saturday Night 7500'
Sunday Morning 7000'
Sunday Afternoon 7500'
Sunday Evening 7500'
Sunday Night 7500'
Mt. Hood Elevation
Saturday Evening* 10000'
Saturday Night 8000'
Sunday Morning 7000'
Sunday Afternoon 6500'
Sunday Evening 6000'
Sunday Night 6000'

5000' Temperatures (°F)

Saturday Night Sunday
Max / Min Max / Min
Olympics 42 / 39 39 / 37
West North 41 / 39 39 / 36
West Central 42 / 38 38 / 36
West South 43 / 39 39 / 37
Stevens Pass 44 / 39 39 / 38
Snoqualmie Pass 42 / 38 38 / 36
East North 42 / 34 39 / 37
East Central 43 / 38 39 / 37
East South 42 / 38 40 / 36
Mt. Hood 44 / 41 44 / 39
Olympics 5000' Temperature Forecast
(Max / Min)
Saturday Night 42 / 39
Sunday 39 / 37
West North 5000' Temperature Forecast
(Max / Min)
Saturday Night 41 / 39
Sunday 39 / 36
West Central 5000' Temperature Forecast
(Max / Min)
Saturday Night 42 / 38
Sunday 38 / 36
West South 5000' Temperature Forecast
(Max / Min)
Saturday Night 43 / 39
Sunday 39 / 37
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Saturday Night 44 / 39
Sunday 39 / 38
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Saturday Night 42 / 38
Sunday 38 / 36
East North 5000' Temperature Forecast
(Max / Min)
Saturday Night 42 / 34
Sunday 39 / 37
East Central 5000' Temperature Forecast
(Max / Min)
Saturday Night 43 / 38
Sunday 39 / 37
East South 5000' Temperature Forecast
(Max / Min)
Saturday Night 42 / 38
Sunday 40 / 36
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Saturday Night 44 / 41
Sunday 44 / 39

Ridgeline Winds (mph)

Saturday Evening Saturday Night Sunday Morning Sunday Afternoon
Olympics SW 30-40 SW 35-50 WSW 20-30 W 10-20
West North SSW 35-50 SSW 40-55 SW 25-35 WSW 10-20
West Central SW 30-40 SW 35-50 WSW 30-40 WSW 15-25
West South WSW 25-35 WSW 25-35 WSW 20-30 WSW 15-25
Stevens Pass WSW 15-25 WSW 20-30 WSW 20-30 WSW 10-20
Snoqualmie Pass WSW 25-35 WSW 25-35 WSW 30-40 WSW 15-25
East North SW 20-30 WSW 30-40 W 25-35 W 15-25
East Central WSW 30-40 WSW 35-50 W 35-50 W 25-35
East South WSW 35-50 WSW 40-55 W 35-50 W 30-40
Mt. Hood WSW 30-40 WSW 40-55 W 35-50 W 25-35
Olympics Ridgeline Winds (mph)
Saturday Evening SW 30-40
Saturday Night SW 35-50
Sunday Morning WSW 20-30
Sunday Afternoon W 10-20
West North Ridgeline Winds (mph)
Saturday Evening SSW 35-50
Saturday Night SSW 40-55
Sunday Morning SW 25-35
Sunday Afternoon WSW 10-20
West Central Ridgeline Winds (mph)
Saturday Evening SW 30-40
Saturday Night SW 35-50
Sunday Morning WSW 30-40
Sunday Afternoon WSW 15-25
West South Ridgeline Winds (mph)
Saturday Evening WSW 25-35
Saturday Night WSW 25-35
Sunday Morning WSW 20-30
Sunday Afternoon WSW 15-25
Stevens Pass Ridgeline Winds (mph)
Saturday Evening WSW 15-25
Saturday Night WSW 20-30
Sunday Morning WSW 20-30
Sunday Afternoon WSW 10-20
Snoqualmie Pass Ridgeline Winds (mph)
Saturday Evening WSW 25-35
Saturday Night WSW 25-35
Sunday Morning WSW 30-40
Sunday Afternoon WSW 15-25
East North Ridgeline Winds (mph)
Saturday Evening SW 20-30
Saturday Night WSW 30-40
Sunday Morning W 25-35
Sunday Afternoon W 15-25
East Central Ridgeline Winds (mph)
Saturday Evening WSW 30-40
Saturday Night WSW 35-50
Sunday Morning W 35-50
Sunday Afternoon W 25-35
East South Ridgeline Winds (mph)
Saturday Evening WSW 35-50
Saturday Night WSW 40-55
Sunday Morning W 35-50
Sunday Afternoon W 30-40
Mt. Hood Ridgeline Winds (mph)
Saturday Evening WSW 30-40
Saturday Night WSW 40-55
Sunday Morning W 35-50
Sunday Afternoon W 25-35

Extended Weather Synopsis

Any break in the weather Monday night looks short-lived. Yet another atmospheric river will begin to bear down on the Pacific Northwest. Right now, the firehose appears to focus further north into Canada, which will help limit the amount of rain in our region. The greatest precipitation totals should occur in the northern half of the forecast area at locations like Hurricane Ridge and Mt Baker with significantly less rain near Mt Hood. Warm temperatures will once again send snow levels upward, topping out around 8000-10000' Tuesday night. This atmospheric river appears to end quickly, with lingering showers and slightly cooler weather in store for Wednesday. 

Extended Snow Level (ft)

Monday Night Tuesday Tuesday Night Wednesday
West North 4500' 4000' 7500' 6000'
Snoqualmie Pass 5500' 7500' 9000' 6500'
Mt. Hood 5500' 9500' 10000' 7500'
West North Elevation
Monday Night 4500'
Tuesday 4000'
Tuesday Night 7500'
Wednesday 6000'
Snoqualmie Pass Elevation
Monday Night 5500'
Tuesday 7500'
Tuesday Night 9000'
Wednesday 6500'
Mt. Hood Elevation
Monday Night 5500'
Tuesday 9500'
Tuesday Night 10000'
Wednesday 7500'

Jump to: Weather Forecast I Precipitation I Snow Level I 5000' Temps I Ridgeline Winds I Extended Weather

Previous forecast from Nov 26, 2021

The NWAC program is administered by the USDA-Forest Service and operates from the National Weather Service Forecast Office in Seattle. NWAC services are made possible by important collaboration and support from a wide variety of federal, state and private cooperators.

The 5000’ temperature forecast does not imply a trend over the 12 hr period and only represents the max and min temperatures within a 12 hr period in the zone. The 6-hr snow level forecast, the forecast discussion, and weather forecast sections may add detail regarding temperature trends.

The snow level forecast represents the general snow level over a 6 hr time period. Freezing levels are forecast when precipitation is not expected.

*Easterly or offshore flow is highlighted with an asterisk when we expect relatively cool east winds in the major Cascade Passes. Easterly flow will often lead to temperature inversions and is a key variable for forecasting precipitation type in the Cascade Passes. Strong easterly flow events can affect terrain on a more regional scale.

Ridgeline winds are the average wind speed and direction over a 6 hr time period.

The wind forecast represents an elevation range instead of a single elevation slice. The elevation range overlaps with the near and above treeline elevation bands in the avalanche forecast and differs per zone.

Wind direction indicates the direction the wind originates or comes from on the 16-point compass rose.

Water Equivalent (WE) is the liquid water equivalent of all precipitation types; rain, snow, ice pellets, etc., forecast to the hundredth of an inch at specific locations. To use WE as a proxy for snowfall amounts, start with a snow to water ratio of 10:1 (10 inches of snow = 1 inch WE). Temperatures at or near freezing will generally have a lower ratio (heavy wet snow) and very cold temperatures can have a much higher ratio (dry fluffy snow).

The label LT, is shorthand for ‘less than’.

Updated Mountain Weather Zone Name Changes – December 2020