Issued: 2:13 PM PST Wednesday, November 24, 2021
by Robert Hahn

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

Weather Synopsis

A series of mild, wet storms will impact the Pacific Northwest over the next week. However, it will take some time for the initial storm Wednesday night through Friday to displace the entrenched cold air across the northern Cascades.

As a frontal system shifts southward Wednesday night and Thursday will bring increasing moisture and moderate SW winds to the region. Snow levels start around 2500 ft in the Mt. Baker and Washington Pass areas. Snow levels rise as moderate to heavy precipitation focuses on the Olympics and northern Cascades. Exact snow levels are difficult to forecast for Mt. Baker as temperatures will be marginal for snow between 4000-5000 ft by Thursday afternoon. 6-12" of wet snow are possible at Mt. Baker ski area base before snow levels rise to 5000 ft Thursday night. Washington Pass should stay all snow on Thursday, but could experience a brief changeover to rain on Thursday night. Stevens Pass and points southward should shift to all rain early Thursday morning.

The heaviest rain and highest elevation snow shifts to the central Washington Cascades Thursday night with a weakened front dropping south of Mt. Hood early Friday. Flow switches W behind the front, bringing some cooling and showery weather in its wake, but snow accumulations should remain light and at high elevations.

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
Wednesday Night Light rain and snow. Rapidly rising snow levels.
Thursday Light to moderate rain and high elevation snow becoming moderate in the afternoon.
Wednesday Night Increasing light rain and snow.
Thursday Moderate rain and snow becoming heavy in the afternoon. Rising snow levels.
Wednesday Night Light rain and snow developing around midnight.
Thursday Light rain and snow becoming moderate in the afternoon. Rising snow levels.
Wednesday Night Cloudy with light rain and snow developing.
Thursday Light rain and high elevation snow.
Wednesday Night Cloudy with light rain and snow developing in the early morning hours. Light E wind at the Pass.
Thursday Increasing light rain and high elevation snow. Rapidly rising snow levels. Light E wind switching W early at the Pass.
Wednesday Night Cloudy with light rain and snow developing in the early morning hours. Light E wind at the Pass.
Thursday Increasing light rain. Light E wind switching W early at the Pass.
Wednesday Night Cloudy with snow developing after midnight.
Thursday Increasing light to moderate snow with rising snow levels. WA Pass likely remaining snow throughout the day.
Wednesday Night Cloudy with light rain or snow developing in the early morning hours.
Thursday Light rain and high elevation snow. Strong ridgeline winds.
Wednesday Night Clouds lowering and thickening.
Thursday Very light rain at times.
Wednesday Night Cloudy. Strong ridgeline wind gusts.
Thursday Cloudy. Strong ridgeline winds.

Precipitation (in)

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

Snow Level (ft)

Wednesday Evening* Wednesday Night* Thursday Morning Thursday Afternoon Thursday Evening* Thursday Night Friday Morning Friday Afternoon
Olympics 3500' 7000' 8500' 8000' 7500' 6500' 5500' 5000'
West North 2500' 2500' 3000' 4500' 5000' 5000' 5000' 4500'
West Central 2000' 3500' 4500' 6000' 7000' 6000' 5000' 5000'
West South 3500' 6500' 8000' 8000' 8000' 7500' 6500' 5500'
Stevens Pass 2000' 3500' 5000' 7500' 7500' 6500' 5500' 5500'
Snoqualmie Pass 2500' 5000' 7000' 8000' 7500' 7000' 6000' 5500'
East North 2000' 2500' 3000' 5000' 5500' 5000' 5000' 5000'
East Central 2500' 4500' 6000' 7500' 7500' 7000' 6000' 5500'
East South 4000' 7000' 9000' 9000' 8500' 7500' 7000' 6000'
Mt. Hood 6000' 8000' 10500' 10000' 9000' 8000' 8000' 7000'
Olympics Elevation
Wednesday Evening* 3500'
Wednesday Night* 7000'
Thursday Morning 8500'
Thursday Afternoon 8000'
Thursday Evening* 7500'
Thursday Night 6500'
Friday Morning 5500'
Friday Afternoon 5000'
West North Elevation
Wednesday Evening* 2500'
Wednesday Night* 2500'
Thursday Morning 3000'
Thursday Afternoon 4500'
Thursday Evening* 5000'
Thursday Night 5000'
Friday Morning 5000'
Friday Afternoon 4500'
West Central Elevation
Wednesday Evening* 2000'
Wednesday Night* 3500'
Thursday Morning 4500'
Thursday Afternoon 6000'
Thursday Evening* 7000'
Thursday Night 6000'
Friday Morning 5000'
Friday Afternoon 5000'
West South Elevation
Wednesday Evening* 3500'
Wednesday Night* 6500'
Thursday Morning 8000'
Thursday Afternoon 8000'
Thursday Evening* 8000'
Thursday Night 7500'
Friday Morning 6500'
Friday Afternoon 5500'
Stevens Pass Elevation
Wednesday Evening* 2000'
Wednesday Night* 3500'
Thursday Morning 5000'
Thursday Afternoon 7500'
Thursday Evening* 7500'
Thursday Night 6500'
Friday Morning 5500'
Friday Afternoon 5500'
Snoqualmie Pass Elevation
Wednesday Evening* 2500'
Wednesday Night* 5000'
Thursday Morning 7000'
Thursday Afternoon 8000'
Thursday Evening* 7500'
Thursday Night 7000'
Friday Morning 6000'
Friday Afternoon 5500'
East North Elevation
Wednesday Evening* 2000'
Wednesday Night* 2500'
Thursday Morning 3000'
Thursday Afternoon 5000'
Thursday Evening* 5500'
Thursday Night 5000'
Friday Morning 5000'
Friday Afternoon 5000'
East Central Elevation
Wednesday Evening* 2500'
Wednesday Night* 4500'
Thursday Morning 6000'
Thursday Afternoon 7500'
Thursday Evening* 7500'
Thursday Night 7000'
Friday Morning 6000'
Friday Afternoon 5500'
East South Elevation
Wednesday Evening* 4000'
Wednesday Night* 7000'
Thursday Morning 9000'
Thursday Afternoon 9000'
Thursday Evening* 8500'
Thursday Night 7500'
Friday Morning 7000'
Friday Afternoon 6000'
Mt. Hood Elevation
Wednesday Evening* 6000'
Wednesday Night* 8000'
Thursday Morning 10500'
Thursday Afternoon 10000'
Thursday Evening* 9000'
Thursday Night 8000'
Friday Morning 8000'
Friday Afternoon 7000'

5000' Temperatures (°F)

Wednesday Night Thursday
Max / Min Max / Min
Olympics 35 / 30 37 / 34
West North 32 / 27 33 / 31
West Central 32 / 27 34 / 31
West South 34 / 30 41 / 34
Stevens Pass 33 / 27 37 / 33
Snoqualmie Pass 32 / 28 36 / 33
East North 30 / 22 36 / 31
East Central 34 / 27 38 / 34
East South 36 / 30 43 / 35
Mt. Hood 40 / 35 46 / 40
Olympics 5000' Temperature Forecast
(Max / Min)
Wednesday Night 35 / 30
Thursday 37 / 34
West North 5000' Temperature Forecast
(Max / Min)
Wednesday Night 32 / 27
Thursday 33 / 31
West Central 5000' Temperature Forecast
(Max / Min)
Wednesday Night 32 / 27
Thursday 34 / 31
West South 5000' Temperature Forecast
(Max / Min)
Wednesday Night 34 / 30
Thursday 41 / 34
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Wednesday Night 33 / 27
Thursday 37 / 33
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Wednesday Night 32 / 28
Thursday 36 / 33
East North 5000' Temperature Forecast
(Max / Min)
Wednesday Night 30 / 22
Thursday 36 / 31
East Central 5000' Temperature Forecast
(Max / Min)
Wednesday Night 34 / 27
Thursday 38 / 34
East South 5000' Temperature Forecast
(Max / Min)
Wednesday Night 36 / 30
Thursday 43 / 35
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Wednesday Night 40 / 35
Thursday 46 / 40

Ridgeline Winds (mph)

Wednesday Evening Wednesday Night Thursday Morning Thursday Afternoon
Olympics SW 15-25 SW 15-25 SW 20-30 SW 20-30
West North SSW 15-25 SSW 20-30 SSW 20-30 SSW 20-30
West Central SSW 10-20 SSW 15-25 SW 20-30 SSW 20-30
West South SW 5-15 SW 10-20 WSW 10-20 SW 15-25
Stevens Pass SW 5-15 SW 10-20 WSW 10-20 SW 15-25
Snoqualmie Pass SW 5-15 WSW 10-20 WSW 15-25 WSW 15-25
East North SW 10-20 SW 15-25 SW 15-25 SW 20-30
East Central WSW 15-25 WSW 20-30 WSW 25-35 WSW 30-40
East South WSW 10-20 WSW 10-20 WSW 15-25 WSW 15-25
Mt. Hood WSW 15-25 WSW 20-30 WSW 25-35 WSW 25-35
Olympics Ridgeline Winds (mph)
Wednesday Evening SW 15-25
Wednesday Night SW 15-25
Thursday Morning SW 20-30
Thursday Afternoon SW 20-30
West North Ridgeline Winds (mph)
Wednesday Evening SSW 15-25
Wednesday Night SSW 20-30
Thursday Morning SSW 20-30
Thursday Afternoon SSW 20-30
West Central Ridgeline Winds (mph)
Wednesday Evening SSW 10-20
Wednesday Night SSW 15-25
Thursday Morning SW 20-30
Thursday Afternoon SSW 20-30
West South Ridgeline Winds (mph)
Wednesday Evening SW 5-15
Wednesday Night SW 10-20
Thursday Morning WSW 10-20
Thursday Afternoon SW 15-25
Stevens Pass Ridgeline Winds (mph)
Wednesday Evening SW 5-15
Wednesday Night SW 10-20
Thursday Morning WSW 10-20
Thursday Afternoon SW 15-25
Snoqualmie Pass Ridgeline Winds (mph)
Wednesday Evening SW 5-15
Wednesday Night WSW 10-20
Thursday Morning WSW 15-25
Thursday Afternoon WSW 15-25
East North Ridgeline Winds (mph)
Wednesday Evening SW 10-20
Wednesday Night SW 15-25
Thursday Morning SW 15-25
Thursday Afternoon SW 20-30
East Central Ridgeline Winds (mph)
Wednesday Evening WSW 15-25
Wednesday Night WSW 20-30
Thursday Morning WSW 25-35
Thursday Afternoon WSW 30-40
East South Ridgeline Winds (mph)
Wednesday Evening WSW 10-20
Wednesday Night WSW 10-20
Thursday Morning WSW 15-25
Thursday Afternoon WSW 15-25
Mt. Hood Ridgeline Winds (mph)
Wednesday Evening WSW 15-25
Wednesday Night WSW 20-30
Thursday Morning WSW 25-35
Thursday Afternoon WSW 25-35

Extended Weather Synopsis

Light rain and high elevation snow showers dissipate Friday evening behind the first departing system, providing a break from the wet weather overnight into Saturday morning. Saturday starts cool with low snow levels as a second stronger system arrives. However, snow levels rise quickly to 4500-5000 ft in the north (much higher further south) as heavy precipitation moves in and continues Saturday night.. Models diverge on Sunday with some showing heavy rain/snow shifting north of the region, while others maintain the deluge over Washington State as the storm track rides atop a ridge over the California near-shore waters.

Extended Snow Level (ft)

Friday Night Saturday Saturday Night* Sunday
West North 3000' 5000' 8000' 7000'
Snoqualmie Pass 4500' 6500' 9000' 8500'
Mt. Hood 6500' 8000' 10000' 11000'
West North Elevation
Friday Night 3000'
Saturday 5000'
Saturday Night* 8000'
Sunday 7000'
Snoqualmie Pass Elevation
Friday Night 4500'
Saturday 6500'
Saturday Night* 9000'
Sunday 8500'
Mt. Hood Elevation
Friday Night 6500'
Saturday 8000'
Saturday Night* 10000'
Sunday 11000'

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

Previous forecast from Nov 23, 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