Issued: 2:33 PM PST Tuesday, November 23, 2021
by Robert Hahn

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

Weather Synopsis

Tuesday's trough shifts eastward overnight as a ridge attempts to build northward into the region. Light snow showers will continue to taper and mostly end, bringing up to 2" of additional accumulations in weak convergence lingering in the central Washington Cascades.

Wednesday features mostly cool, dry weather with a subtle ridge over the area. Low clouds along the west slopes should retreat early in the day, leaving a mid and upper-level incoming cloud deck. Temperatures moderate significantly as an approaching system (moderate atmospheric river) brings rising freezing levels from south to north.

The frontal rainband increasingly brushes NW Washington Wednesday night. Most areas will experience continued significant warming. However, light precipitation encounters sufficient entrenched cold air to maintain snowfall for Mt. Baker while increasing light E flow through the Passes maintain snowfall at Stevens and Washington Passes with a changeover to rain at Snoqualmie Pass likely.

Rain and snow become moderate to heavy over NW Washington on Thursday as the front sags southward. Milder air continues to stream into the region and should change precipitation to rain at all ski area bases. Washington Pass may mix with rain by afternoon as E flow loses steam.

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
Tuesday Night Partly cloudy with isolated snow flurries.
Wednesday Cloudy.
Tuesday Night Mostly cloudy with isolated snow flurries.
Wednesday Cloudy.
Tuesday Night Decreasing very light snow showers and weak convergence shifting from S to N.
Wednesday Cloudy.
Tuesday Night Decreasing very light snow showers and weak convergence ending around midnight.
Wednesday Cloudy.
Tuesday Night Decreasing very light snow showers and weak convergence ending by morning. Decreasing light W wind at the Pass.
Wednesday Cloudy. Increasing light E wind through the Pass.
Tuesday Night Decreasing very light snow showers and weak convergence ending around midnight. Decreasing light W wind at the Pass.
Wednesday Cloudy. Increasing light E wind through the Pass.
Tuesday Night Partly cloudy with clouds mostly near the Cascade Crest.
Wednesday Cloudy.
Tuesday Night Mostly cloudy with light snow showers in convergence spillover near the Cascade Crest.
Wednesday Cloudy.
Tuesday Night Partly to mostly cloudy near the Cascade Crest with isolated snow flurries.
Wednesday Cloudy.
Tuesday Night Mostly cloudy in the evening, then becoming partly cloudy.
Wednesday Cloudy.

Precipitation (in)

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

Snow Level (ft)

Tuesday Evening Tuesday Night Wednesday Morning Wednesday Afternoon* Wednesday Evening* Wednesday Night* Thursday Morning* Thursday Afternoon
Olympics 2500' 2000' 2500' 3500' 3500' 7500' 8500' 8000'
West North 2000' 1500' 2000' 3000' 2500' 2500' 3500' 4500'
West Central 2500' 2000' 2000' 3000' 2500' 3500' 5500' 6000'
West South 2500' 1500' 2000' 3500' 3500' 6500' 8000' 8000'
Stevens Pass 2000' 1500' 2000' 3500' 2000' 3500' 6500' 7000'
Snoqualmie Pass 2000' 2000' 2500' 3500' 2500' 5000' 8000' 7500'
East North 2000' 1500' 2000' 3500' 2000' 3000' 3500' 5000'
East Central 2000' 2000' 2000' 3500' 3000' 5000' 7000' 7500'
East South 2500' 2500' 2500' 4000' 4500' 7500' 9000' 9000'
Mt. Hood 3000' 3000' 2500' 5000' 8000' 10000' 10500' 10000'
Olympics Elevation
Tuesday Evening 2500'
Tuesday Night 2000'
Wednesday Morning 2500'
Wednesday Afternoon* 3500'
Wednesday Evening* 3500'
Wednesday Night* 7500'
Thursday Morning* 8500'
Thursday Afternoon 8000'
West North Elevation
Tuesday Evening 2000'
Tuesday Night 1500'
Wednesday Morning 2000'
Wednesday Afternoon* 3000'
Wednesday Evening* 2500'
Wednesday Night* 2500'
Thursday Morning* 3500'
Thursday Afternoon 4500'
West Central Elevation
Tuesday Evening 2500'
Tuesday Night 2000'
Wednesday Morning 2000'
Wednesday Afternoon* 3000'
Wednesday Evening* 2500'
Wednesday Night* 3500'
Thursday Morning* 5500'
Thursday Afternoon 6000'
West South Elevation
Tuesday Evening 2500'
Tuesday Night 1500'
Wednesday Morning 2000'
Wednesday Afternoon* 3500'
Wednesday Evening* 3500'
Wednesday Night* 6500'
Thursday Morning* 8000'
Thursday Afternoon 8000'
Stevens Pass Elevation
Tuesday Evening 2000'
Tuesday Night 1500'
Wednesday Morning 2000'
Wednesday Afternoon* 3500'
Wednesday Evening* 2000'
Wednesday Night* 3500'
Thursday Morning* 6500'
Thursday Afternoon 7000'
Snoqualmie Pass Elevation
Tuesday Evening 2000'
Tuesday Night 2000'
Wednesday Morning 2500'
Wednesday Afternoon* 3500'
Wednesday Evening* 2500'
Wednesday Night* 5000'
Thursday Morning* 8000'
Thursday Afternoon 7500'
East North Elevation
Tuesday Evening 2000'
Tuesday Night 1500'
Wednesday Morning 2000'
Wednesday Afternoon* 3500'
Wednesday Evening* 2000'
Wednesday Night* 3000'
Thursday Morning* 3500'
Thursday Afternoon 5000'
East Central Elevation
Tuesday Evening 2000'
Tuesday Night 2000'
Wednesday Morning 2000'
Wednesday Afternoon* 3500'
Wednesday Evening* 3000'
Wednesday Night* 5000'
Thursday Morning* 7000'
Thursday Afternoon 7500'
East South Elevation
Tuesday Evening 2500'
Tuesday Night 2500'
Wednesday Morning 2500'
Wednesday Afternoon* 4000'
Wednesday Evening* 4500'
Wednesday Night* 7500'
Thursday Morning* 9000'
Thursday Afternoon 9000'
Mt. Hood Elevation
Tuesday Evening 3000'
Tuesday Night 3000'
Wednesday Morning 2500'
Wednesday Afternoon* 5000'
Wednesday Evening* 8000'
Wednesday Night* 10000'
Thursday Morning* 10500'
Thursday Afternoon 10000'

5000' Temperatures (°F)

Tuesday Night Wednesday
Max / Min Max / Min
Olympics 26 / 23 29 / 23
West North 27 / 22 27 / 23
West Central 27 / 23 29 / 23
West South 27 / 21 30 / 22
Stevens Pass 26 / 20 28 / 21
Snoqualmie Pass 28 / 22 29 / 23
East North 23 / 17 25 / 18
East Central 28 / 23 28 / 23
East South 29 / 24 30 / 25
Mt. Hood 28 / 23 36 / 25
Olympics 5000' Temperature Forecast
(Max / Min)
Tuesday Night 26 / 23
Wednesday 29 / 23
West North 5000' Temperature Forecast
(Max / Min)
Tuesday Night 27 / 22
Wednesday 27 / 23
West Central 5000' Temperature Forecast
(Max / Min)
Tuesday Night 27 / 23
Wednesday 29 / 23
West South 5000' Temperature Forecast
(Max / Min)
Tuesday Night 27 / 21
Wednesday 30 / 22
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Tuesday Night 26 / 20
Wednesday 28 / 21
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Tuesday Night 28 / 22
Wednesday 29 / 23
East North 5000' Temperature Forecast
(Max / Min)
Tuesday Night 23 / 17
Wednesday 25 / 18
East Central 5000' Temperature Forecast
(Max / Min)
Tuesday Night 28 / 23
Wednesday 28 / 23
East South 5000' Temperature Forecast
(Max / Min)
Tuesday Night 29 / 24
Wednesday 30 / 25
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Tuesday Night 28 / 23
Wednesday 36 / 25

Ridgeline Winds (mph)

Tuesday Evening Tuesday Night Wednesday Morning Wednesday Afternoon
Olympics W 5-15 WSW 0-10 WSW 0-10 SW 5-15
West North WSW 0-10 SW 0-10 SW 0-10 SSW 10-20
West Central W 5-15 W 5-15 WSW 0-10 SW 5-15
West South W 0-10 W 0-10 W 0-10 WSW 5-15
Stevens Pass W 0-10 W 0-10 W 0-10 W 0-10
Snoqualmie Pass W 5-15 W 5-15 W 0-10 W 5-15
East North W 0-10 W 0-10 W 0-10 WSW 5-15
East Central WNW 5-15 WNW 5-15 W 0-10 W 0-10
East South WNW 5-15 W 0-10 W 0-10 WSW 0-10
Mt. Hood WNW 10-20 W 10-20 W 0-10 SSW 5-15
Olympics Ridgeline Winds (mph)
Tuesday Evening W 5-15
Tuesday Night WSW 0-10
Wednesday Morning WSW 0-10
Wednesday Afternoon SW 5-15
West North Ridgeline Winds (mph)
Tuesday Evening WSW 0-10
Tuesday Night SW 0-10
Wednesday Morning SW 0-10
Wednesday Afternoon SSW 10-20
West Central Ridgeline Winds (mph)
Tuesday Evening W 5-15
Tuesday Night W 5-15
Wednesday Morning WSW 0-10
Wednesday Afternoon SW 5-15
West South Ridgeline Winds (mph)
Tuesday Evening W 0-10
Tuesday Night W 0-10
Wednesday Morning W 0-10
Wednesday Afternoon WSW 5-15
Stevens Pass Ridgeline Winds (mph)
Tuesday Evening W 0-10
Tuesday Night W 0-10
Wednesday Morning W 0-10
Wednesday Afternoon W 0-10
Snoqualmie Pass Ridgeline Winds (mph)
Tuesday Evening W 5-15
Tuesday Night W 5-15
Wednesday Morning W 0-10
Wednesday Afternoon W 5-15
East North Ridgeline Winds (mph)
Tuesday Evening W 0-10
Tuesday Night W 0-10
Wednesday Morning W 0-10
Wednesday Afternoon WSW 5-15
East Central Ridgeline Winds (mph)
Tuesday Evening WNW 5-15
Tuesday Night WNW 5-15
Wednesday Morning W 0-10
Wednesday Afternoon W 0-10
East South Ridgeline Winds (mph)
Tuesday Evening WNW 5-15
Tuesday Night W 0-10
Wednesday Morning W 0-10
Wednesday Afternoon WSW 0-10
Mt. Hood Ridgeline Winds (mph)
Tuesday Evening WNW 10-20
Tuesday Night W 10-20
Wednesday Morning W 0-10
Wednesday Afternoon SSW 5-15

Extended Weather Synopsis

Thursday night features the heaviest precipitation as a cold front cuts off the atmospheric river of moisture from north to south. Snow levels Thursday evening peak around 6000 ft in the north and 9500 ft for Mt Hood, before starting to drop. The heaviest rainfall will likely focus on the central Washington Cascades with 1-2.5" of precipitation Thursday night.

Mostly light post-frontal snow showers decrease Friday and Friday night as snow levels gradually lower. Expect snow to return to ski area bases from Stevens Pass northward by late Friday or Friday evening.

The next atmospheric river event lifts a warm front across Washington State on Saturday, bringing increasing moderate to heavy rain and high elevation snow. Without much cold air in place, expect a changeover from snow to rain as snow levels rise above the tops of most ski areas by the afternoon. Washington Pass will probably maintain snowfall.

Extended Snow Level (ft)

Thursday Night Friday Friday Night Saturday
West North 6000' 4500' 4000' 5000'
Snoqualmie Pass 7500' 5500' 5000' 6500'
Mt. Hood 8500' 7500' 7000' 9500'
West North Elevation
Thursday Night 6000'
Friday 4500'
Friday Night 4000'
Saturday 5000'
Snoqualmie Pass Elevation
Thursday Night 7500'
Friday 5500'
Friday Night 5000'
Saturday 6500'
Mt. Hood Elevation
Thursday Night 8500'
Friday 7500'
Friday Night 7000'
Saturday 9500'

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

Previous forecast from Nov 22, 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