Issued: 1:55 PM PST Thursday, January 13, 2022
by Dallas Glass

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

Weather Synopsis

We're in for a quiet few days on the weather front. A high-pressure ridge is already beginning to build over the region this afternoon and push any remaining showers down into Oregon. This trend will continue overnight. Areas close to Mt Hood and Mt St Helens could see precipitation hang on into the evening hours, but eventually the high pressure will win, and dry conditions will prevail across our entire region. As skies clear, particularly from about Mt Rainier northward, you may find temperature inversions overnight and into the morning hours. This should result in some low-level clouds and fog in the mountain valleys and passes. 

Warm air will start to seep into the Pacific Northwest late Thursday night but should arrive in earnest on Friday. This will be the most impactful weather factor in our near-term forecast. Freezing levels will peak in the afternoon around 7500-10000 ft and should remain nearly that high well into the weekend. While warm and dry weather easily describes Friday's forecast, the cloud cover will be a bit trickier. Passing bands of high clouds may cross the northern portion half of the region as a few weak disturbances head along the ridge into Canada. For locations further south and east, expect mostly clear skies. This should once again allow temperature inversions to develop in the mountain valleys and passes Friday night into Saturday morning.  

A few sprinkles may clip the north Cascades first thing Saturday, but generally, this appears to be yet another warm and dry day. The only real change in the weather is a flattening high-pressure ridge could allow a few additional clouds into the area for the weekend. 

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
Thursday Night Mostly clear and calm. Warming.
Friday Mostly sunny and warm with light to moderate SSW winds in the morning decreasing in the afternoon.
Thursday Night Mostly clear. Temperature inversions, low clouds, and fog possible in mountain valleys.
Friday Mostly sunny and warm with some passing high clouds. SSW winds increasing in the afternoon.
Thursday Night Mostly clear. Temperature inversions, low clouds, and fog possible in mountain valleys.
Friday Mostly sunny and warm with some passing high clouds. SSW winds increasing in the afternoon.
Thursday Night Partly cloudy with isolated showers near Mt St Helens and Mt Adams. Mostly clear north of Hwy 12. Temperature inversions, low clouds, and fog possible near the mountain valleys and passes.
Friday Mostly sunny and warm. Passing high clouds possible.
Thursday Night Mostly clear. Light E flow developing overnight. Temperature inversions, low clouds, and fog possible.
Friday Mostly sunny and warm with light easterly flow. Passing high clouds possible.
Thursday Night Mostly clear. Light E flow developing overnight. Temperature inversions, low clouds, and fog possible.
Friday Mostly sunny and warm with light easterly flow. Passing high clouds possible.
Thursday Night Mostly clear. Temperature inversions with patchy low-clouds in the mountain valleys and passes.
Friday Mostly sunny and warm with passing high clouds.
Thursday Night Mostly clear. Temperature inversion, with patchy low clouds in the mountain valleys and passes.
Friday Sunny and warm. Light to moderate SSW winds decreasing in the afternoon.
Thursday Night Partly to mostly clear. A few sprinkles near Mt Adams. Temperatures inversion and patchy low clouds possible particularly north of Hwy 12.
Friday Sunny and warm. A few high clouds in the morning.
Thursday Night Cloudy with rain and snow showers. Becoming partly cloudy. Moderate winds decreasing.
Friday Mostly sunny and warm.

Precipitation (in)

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

Snow Level (ft)

Thursday Evening Thursday Night* Friday Morning* Friday Afternoon* Friday Evening* Friday Night* Saturday Morning Saturday Afternoon
Olympics 8000' 8500' 8500' 9000' 8000' 7500' 6500' 6500'
West North 5500' 6500' 7000' 7500' 6000' 5000' 5000' 5000'
West Central 5500' 6500' 7500' 8500' 6500' 5000' 5000' 5500'
West South 5500' 6500' 7500' 9500' 7000' 6500' 6500' 7000'
Stevens Pass 5500' 6500' 7500' 8000' 6000' 5500' 5000' 5500'
Snoqualmie Pass 5500' 6500' 7500' 8500' 6500' 6000' 5500' 6000'
East North 4500' 5500' 6500' 7500' 6000' 5500' 5000' 5500'
East Central 5500' 6000' 6500' 7500' 6500' 5500' 5500' 6500'
East South 5000' 6000' 6500' 8500' 7000' 6500' 6500' 7500'
Mt. Hood 5500' 7000' 8000' 10000' 8000' 7500' 7500' 9000'
Olympics Elevation
Thursday Evening 8000'
Thursday Night* 8500'
Friday Morning* 8500'
Friday Afternoon* 9000'
Friday Evening* 8000'
Friday Night* 7500'
Saturday Morning 6500'
Saturday Afternoon 6500'
West North Elevation
Thursday Evening 5500'
Thursday Night* 6500'
Friday Morning* 7000'
Friday Afternoon* 7500'
Friday Evening* 6000'
Friday Night* 5000'
Saturday Morning 5000'
Saturday Afternoon 5000'
West Central Elevation
Thursday Evening 5500'
Thursday Night* 6500'
Friday Morning* 7500'
Friday Afternoon* 8500'
Friday Evening* 6500'
Friday Night* 5000'
Saturday Morning 5000'
Saturday Afternoon 5500'
West South Elevation
Thursday Evening 5500'
Thursday Night* 6500'
Friday Morning* 7500'
Friday Afternoon* 9500'
Friday Evening* 7000'
Friday Night* 6500'
Saturday Morning 6500'
Saturday Afternoon 7000'
Stevens Pass Elevation
Thursday Evening 5500'
Thursday Night* 6500'
Friday Morning* 7500'
Friday Afternoon* 8000'
Friday Evening* 6000'
Friday Night* 5500'
Saturday Morning 5000'
Saturday Afternoon 5500'
Snoqualmie Pass Elevation
Thursday Evening 5500'
Thursday Night* 6500'
Friday Morning* 7500'
Friday Afternoon* 8500'
Friday Evening* 6500'
Friday Night* 6000'
Saturday Morning 5500'
Saturday Afternoon 6000'
East North Elevation
Thursday Evening 4500'
Thursday Night* 5500'
Friday Morning* 6500'
Friday Afternoon* 7500'
Friday Evening* 6000'
Friday Night* 5500'
Saturday Morning 5000'
Saturday Afternoon 5500'
East Central Elevation
Thursday Evening 5500'
Thursday Night* 6000'
Friday Morning* 6500'
Friday Afternoon* 7500'
Friday Evening* 6500'
Friday Night* 5500'
Saturday Morning 5500'
Saturday Afternoon 6500'
East South Elevation
Thursday Evening 5000'
Thursday Night* 6000'
Friday Morning* 6500'
Friday Afternoon* 8500'
Friday Evening* 7000'
Friday Night* 6500'
Saturday Morning 6500'
Saturday Afternoon 7500'
Mt. Hood Elevation
Thursday Evening 5500'
Thursday Night* 7000'
Friday Morning* 8000'
Friday Afternoon* 10000'
Friday Evening* 8000'
Friday Night* 7500'
Saturday Morning 7500'
Saturday Afternoon 9000'

5000' Temperatures (°F)

Thursday Night Friday
Max / Min Max / Min
Olympics 35 / 28 37 / 31
West North 34 / 26 34 / 30
West Central 35 / 29 38 / 30
West South 39 / 28 39 / 29
Stevens Pass 37 / 29 37 / 28
Snoqualmie Pass 36 / 29 38 / 28
East North 36 / 26 38 / 28
East Central 37 / 29 39 / 29
East South 37 / 29 37 / 29
Mt. Hood 38 / 28 39 / 29
Olympics 5000' Temperature Forecast
(Max / Min)
Thursday Night 35 / 28
Friday 37 / 31
West North 5000' Temperature Forecast
(Max / Min)
Thursday Night 34 / 26
Friday 34 / 30
West Central 5000' Temperature Forecast
(Max / Min)
Thursday Night 35 / 29
Friday 38 / 30
West South 5000' Temperature Forecast
(Max / Min)
Thursday Night 39 / 28
Friday 39 / 29
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Thursday Night 37 / 29
Friday 37 / 28
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Thursday Night 36 / 29
Friday 38 / 28
East North 5000' Temperature Forecast
(Max / Min)
Thursday Night 36 / 26
Friday 38 / 28
East Central 5000' Temperature Forecast
(Max / Min)
Thursday Night 37 / 29
Friday 39 / 29
East South 5000' Temperature Forecast
(Max / Min)
Thursday Night 37 / 29
Friday 37 / 29
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Thursday Night 38 / 28
Friday 39 / 29

Ridgeline Winds (mph)

Thursday Evening Thursday Night Friday Morning Friday Afternoon
Olympics E 0-10 S 5-15 SSW 10-20 SW 5-15
West North ENE 0-10 SSW 5-15 SSW 10-20 SSW 15-25
West Central E 0-10 SSW 5-15 SSW 5-15 SSW 10-20
West South VAR 0-10 S 5-15 S 5-15 SSW 5-15
Stevens Pass VAR 0-10 SSE 5-15 SSW 0-10 SSW 0-10
Snoqualmie Pass VAR 0-10 SSE 5-15 SSE 5-15 SSW 0-10
East North NNE 5-15 VAR 0-10 WSW 5-15 SW 5-15
East Central NNE 5-15 VAR 0-10 SSW 10-20 SW 5-15
East South NE 0-10 SE 5-15 SW 5-15 SW 5-15
Mt. Hood NW 10-20 ESE 5-15 S 5-15 SW 5-15
Olympics Ridgeline Winds (mph)
Thursday Evening E 0-10
Thursday Night S 5-15
Friday Morning SSW 10-20
Friday Afternoon SW 5-15
West North Ridgeline Winds (mph)
Thursday Evening ENE 0-10
Thursday Night SSW 5-15
Friday Morning SSW 10-20
Friday Afternoon SSW 15-25
West Central Ridgeline Winds (mph)
Thursday Evening E 0-10
Thursday Night SSW 5-15
Friday Morning SSW 5-15
Friday Afternoon SSW 10-20
West South Ridgeline Winds (mph)
Thursday Evening VAR 0-10
Thursday Night S 5-15
Friday Morning S 5-15
Friday Afternoon SSW 5-15
Stevens Pass Ridgeline Winds (mph)
Thursday Evening VAR 0-10
Thursday Night SSE 5-15
Friday Morning SSW 0-10
Friday Afternoon SSW 0-10
Snoqualmie Pass Ridgeline Winds (mph)
Thursday Evening VAR 0-10
Thursday Night SSE 5-15
Friday Morning SSE 5-15
Friday Afternoon SSW 0-10
East North Ridgeline Winds (mph)
Thursday Evening NNE 5-15
Thursday Night VAR 0-10
Friday Morning WSW 5-15
Friday Afternoon SW 5-15
East Central Ridgeline Winds (mph)
Thursday Evening NNE 5-15
Thursday Night VAR 0-10
Friday Morning SSW 10-20
Friday Afternoon SW 5-15
East South Ridgeline Winds (mph)
Thursday Evening NE 0-10
Thursday Night SE 5-15
Friday Morning SW 5-15
Friday Afternoon SW 5-15
Mt. Hood Ridgeline Winds (mph)
Thursday Evening NW 10-20
Thursday Night ESE 5-15
Friday Morning S 5-15
Friday Afternoon SW 5-15

Extended Weather Synopsis

Warm and dry weather should hang with us through the weekend as we sit protected under a flat high-pressure ridge. Period of clouds may pass overhead, but any precipitation will continue to deflect north into Canada. An approaching low-pressure system will try to nudge the ridge out of the way on Monday and bring precipitation back to the mountains. Right now the weather models differ on the success of the Low, with some only allowing a few showers to find their way to the mountains. 

Extended Snow Level (ft)

Saturday Night Sunday Sunday Night Monday
West North 4000' 6500' 6000' 5500'
Snoqualmie Pass 5500' 8500' 8000' 7000'
Mt. Hood 9500' 10000' 9500' 9000'
West North Elevation
Saturday Night 4000'
Sunday 6500'
Sunday Night 6000'
Monday 5500'
Snoqualmie Pass Elevation
Saturday Night 5500'
Sunday 8500'
Sunday Night 8000'
Monday 7000'
Mt. Hood Elevation
Saturday Night 9500'
Sunday 10000'
Sunday Night 9500'
Monday 9000'

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

Previous forecast from Jan 13, 2022

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