Issued: 1:53 PM PST Thursday, December 8, 2022
by Dallas Glass

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

Weather Synopsis

It's been stormy out in the mountains Thursday. However, the cold front pushed through mid-day. Since then, precipitation and wind speeds slowly decreased. Showers will persist overnight and into Friday morning as the mountains experience a very gradual drying trend from north to south. Not surprisingly, Mt Hood, Mt St Helens, and Mt Rainier will be the focus of these remaining snow showers as lingering moisture continues to move southward. 

After showers in the morning, many locations will experience a generally dry day Friday. Even as the skies start to clear, high clouds will quickly replace any patches of blue sky you may see. As these clouds thicken and lower, you'll know the next storm is knocking at that door. A low-pressure system will start to slide down the coast, but stall just offshore. This storm sends the bulk of its moisture to California, but with its close proximity to our mountains, snow should rotate up into our region from the south. Expect snow to spread from SSW to NNE Friday night. South to south-easterly winds should help enhance shower activity for places like Mission Ridge, Ahtanum Meadows, and Mt Hood. Similarly, southerly flow will continue to favor the volcanoes where a foot or more of snow could quickly accumulate overnight. 

By Saturday morning, the stalled low pressure will slowly begin to meander its way further south and take with it the majority of the precipitation. Showers should very slowly diminish in the North Cascades by the afternoon. Locations further north and east may even start to see a few breaks in the sky. 

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 cloudy with isolated showers. SW winds becoming light to moderate.
Friday Mostly cloudy with isolated showers in the morning. S winds becoming moderate to strong in the afternoon. Showers increasing in the southern Olympics late in the day.
Thursday Night Cloudy with snow showers. SW winds becoming light to moderate overnight.
Friday Cloudy with snow showers particularly in the morning. Moderate S winds increasing slightly in the afternoon.
Thursday Night Cloudy with snow showers, heavies south of highway 2.
Friday Cloudy with snow showers in the morning. Winds becoming moderate from the south.
Thursday Night Cloudy with snow showers heaviest near Mt St Helens and Mt Rainier. Light to moderate W winds.
Friday Cloudy with showers lingering on the volcanoes. Moderate winds moving from SW to SSE.
Thursday Night Cloudy with isolated snow showers. Light W flow at pass level.
Friday Cloudy with a few isolated showers in the morning. Ridgetop winds becoming light to moderate and shifting to the SE. Light E flow developing at pass level.
Thursday Night Cloudy with snow showers. Light to moderate W winds decreasing slightly.
Friday Cloudy with a few snow showers in the morning. Winds becoming moderate from the SE. E flow developing at pass level.
Thursday Night Cloudy with a few isolated showers.
Friday Partly to mostly cloudy with a few light showers possible in the morning.
Thursday Night Mostly cloudy with a few showers possible near the crest. Moderate W winds decreasing.
Friday Partly to mostly cloudy with some sun breaks. Winds becoming SSW light to moderate in the afternoon.
Thursday Night Cloudy with snow showers possible. Light to moderate W winds.
Friday Mostly cloudy with a few showers possible. Light to moderate SW winds.
Thursday Night Cloudy with snow showers continuing. Moderate W winds.
Friday Cloudy with snow showers lingering. SW winds becoming moderate to strong.

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

Snow Level (ft)

Thursday Evening Thursday Night Friday Morning* Friday Afternoon* Friday Evening* Friday Night* Saturday Morning* Saturday Afternoon*
Olympics 1000' 1000' 500' 1500' 2000' 3500' 3000' 3000'
West North 1000' 500' 500' 1000' 1000' 1500' 1500' 2500'
West Central 1500' 1000' 1000' 1000' 1000' 1500' 1500' 2500'
West South 1500' 1000' 1000' 1500' 2000' 2500' 2500' 3000'
Stevens Pass 1000' 1000' 1000' 1000' 1000' 1500' 1500' 2000'
Snoqualmie Pass 1500' 1000' 1000' 1000' 1000' 1500' 1500' 2500'
East North 1000' 500' 500' 500' 0 500' 1000' 1000'
East Central 1000' 500' 500' 1000' 1000' 1500' 1500' 2000'
East South 1500' 1000' 1000' 1500' 1500' 2500' 2000' 2500'
Mt. Hood 2000' 1500' 1500' 2500' 3000' 4000' 3500' 3500'
Olympics Elevation
Thursday Evening 1000'
Thursday Night 1000'
Friday Morning* 500'
Friday Afternoon* 1500'
Friday Evening* 2000'
Friday Night* 3500'
Saturday Morning* 3000'
Saturday Afternoon* 3000'
West North Elevation
Thursday Evening 1000'
Thursday Night 500'
Friday Morning* 500'
Friday Afternoon* 1000'
Friday Evening* 1000'
Friday Night* 1500'
Saturday Morning* 1500'
Saturday Afternoon* 2500'
West Central Elevation
Thursday Evening 1500'
Thursday Night 1000'
Friday Morning* 1000'
Friday Afternoon* 1000'
Friday Evening* 1000'
Friday Night* 1500'
Saturday Morning* 1500'
Saturday Afternoon* 2500'
West South Elevation
Thursday Evening 1500'
Thursday Night 1000'
Friday Morning* 1000'
Friday Afternoon* 1500'
Friday Evening* 2000'
Friday Night* 2500'
Saturday Morning* 2500'
Saturday Afternoon* 3000'
Stevens Pass Elevation
Thursday Evening 1000'
Thursday Night 1000'
Friday Morning* 1000'
Friday Afternoon* 1000'
Friday Evening* 1000'
Friday Night* 1500'
Saturday Morning* 1500'
Saturday Afternoon* 2000'
Snoqualmie Pass Elevation
Thursday Evening 1500'
Thursday Night 1000'
Friday Morning* 1000'
Friday Afternoon* 1000'
Friday Evening* 1000'
Friday Night* 1500'
Saturday Morning* 1500'
Saturday Afternoon* 2500'
East North Elevation
Thursday Evening 1000'
Thursday Night 500'
Friday Morning* 500'
Friday Afternoon* 500'
Friday Evening* 0'
Friday Night* 500'
Saturday Morning* 1000'
Saturday Afternoon* 1000'
East Central Elevation
Thursday Evening 1000'
Thursday Night 500'
Friday Morning* 500'
Friday Afternoon* 1000'
Friday Evening* 1000'
Friday Night* 1500'
Saturday Morning* 1500'
Saturday Afternoon* 2000'
East South Elevation
Thursday Evening 1500'
Thursday Night 1000'
Friday Morning* 1000'
Friday Afternoon* 1500'
Friday Evening* 1500'
Friday Night* 2500'
Saturday Morning* 2000'
Saturday Afternoon* 2500'
Mt. Hood Elevation
Thursday Evening 2000'
Thursday Night 1500'
Friday Morning* 1500'
Friday Afternoon* 2500'
Friday Evening* 3000'
Friday Night* 4000'
Saturday Morning* 3500'
Saturday Afternoon* 3500'

5000' Temperatures (°F)

Thursday Night Friday
Max / Min Max / Min
Olympics 28 / 20 29 / 21
West North 26 / 19 26 / 20
West Central 24 / 19 25 / 21
West South 27 / 21 28 / 22
Stevens Pass 26 / 20 27 / 19
Snoqualmie Pass 26 / 20 26 / 20
East North 21 / 17 21 / 15
East Central 22 / 19 24 / 19
East South 27 / 20 27 / 19
Mt. Hood 28 / 22 28 / 23
Olympics 5000' Temperature Forecast
(Max / Min)
Thursday Night 28 / 20
Friday 29 / 21
West North 5000' Temperature Forecast
(Max / Min)
Thursday Night 26 / 19
Friday 26 / 20
West Central 5000' Temperature Forecast
(Max / Min)
Thursday Night 24 / 19
Friday 25 / 21
West South 5000' Temperature Forecast
(Max / Min)
Thursday Night 27 / 21
Friday 28 / 22
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Thursday Night 26 / 20
Friday 27 / 19
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Thursday Night 26 / 20
Friday 26 / 20
East North 5000' Temperature Forecast
(Max / Min)
Thursday Night 21 / 17
Friday 21 / 15
East Central 5000' Temperature Forecast
(Max / Min)
Thursday Night 22 / 19
Friday 24 / 19
East South 5000' Temperature Forecast
(Max / Min)
Thursday Night 27 / 20
Friday 27 / 19
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Thursday Night 28 / 22
Friday 28 / 23

Ridgeline Winds (mph)

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

Extended Weather Synopsis

As the low drifts south and showers start to taper, we aren't done quite yet. Moisture continues to eject out of the low and spin up into the southern part of the forecast region Saturday night and Sunday. While uncertainty is still quite high with this feature, it could spell an additional round of precipitation for the southern volcanoes and eastern slopes from Mission Ridge to Darland Mt. By Monday, a building high-pressure ridge will shove any lingering showers out of the area and usher us into a longer period of dry weather. 

 

Extended Snow Level (ft)

Saturday Night* Sunday Sunday Night Monday
West North 2000' 2000' 1000' 500'
Snoqualmie Pass 2000' 2000' 1500' 1000'
Mt. Hood 3000' 2000' 1500' 1500'
West North Elevation
Saturday Night* 2000'
Sunday 2000'
Sunday Night 1000'
Monday 500'
Snoqualmie Pass Elevation
Saturday Night* 2000'
Sunday 2000'
Sunday Night 1500'
Monday 1000'
Mt. Hood Elevation
Saturday Night* 3000'
Sunday 2000'
Sunday Night 1500'
Monday 1500'

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

Previous forecast from Dec 8, 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