Issued: 1:59 PM PST Friday, November 18, 2022
by Dennis D'Amico

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

Weather Synopsis

Dry and mostly clear weather will continue through the weekend, extending our lengthy dry stretch during what is climatologically speaking the wettest time of year. The biggest question this weekend will be how freezing levels play out across the forecast area. With strong high pressure and cold air anchored over the inland NW, we've seen offshore flow lead to moderate to locally strong east winds and a large West-East temperature gradient across the Cascade crest, including Mt. Hood, with much milder temperatures located to the west and cooler temperatures to the east. 

On Saturday, those milder temperatures and high freezing levels will chip away at the colder air entrenched east of the Cascade crest. Even for the east-side, generally below-freezing temperatures are expected to moderate and rise over the weekend.  In addition to the geographic differences in temperatures, expect to encounter strong temperature inversions.  You'll likely be chilly at the trailhead or in the valley, and as you hit mid and upper elevations, the sun and rising temperatures with elevation should feel quite nice. The air mass is quite dry at those mid and higher elevations as well, and RH's (relative humidities) are very low (chapstick warning?). 

On Sunday, we'll start to see some mid/high clouds grace the area. The clouds will be running ahead of a weak Pacific frontal system offshore. The air mass will become more mixed on Sunday, with less of a West-East temperature/freezing gradient across the Cascades. 

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
Friday Night Mostly clear.
Saturday Mostly sunny.
Friday Night Mostly clear.
Saturday Mostly sunny.
Friday Night Mostly clear.
Saturday Mostly sunny.
Friday Night Mostly clear. Cooler and breezy closer to the Cascade crest. Milder for areas further west like Mt St Helens and the west side of Mt Rainier.
Saturday Mostly sunny. Cooler and breezy closer to the Cascade crest in the morning. Milder for areas further west like Mt St Helens and the west side of Mt Rainier.
Friday Night Mostly clear. Light to occasionally moderate east winds both at Pass level and ridgelines.
Saturday Mostly sunny. Light east winds becoming variable.
Friday Night Mostly clear. Light to moderate east winds both at Pass level and ridgelines.
Saturday Mostly sunny. Light east winds becoming variable.
Friday Night Mostly clear.
Saturday Mostly sunny.
Friday Night Mostly clear.
Saturday Mostly sunny.
Friday Night Mostly clear.
Saturday Mostly sunny.
Friday Night Mostly clear. Moderate ridgeline winds.
Saturday Mostly sunny. Temperatures milder at mid/upper elevations and west side of the mountain.

Precipitation (in)

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

Snow Level (ft)

Friday Evening* Friday Night* Saturday Morning* Saturday Afternoon* Saturday Evening* Saturday Night* Sunday Morning Sunday Afternoon
Olympics 9000' 9000' 8500' 8500' 8500' 8000' 7500' 7000'
West North 8000' 8000' 8000' 8000' 8000' 7500' 7000' 6000'
West Central 7000' 7000' 8000' 8000' 8000' 7500' 7500' 7000'
West South 7000' 8000' 9000' 9000' 9000' 8000' 7500' 7000'
Stevens Pass 3000' 2000' 3500' 4000' 4000' 3000' 4000' 5000'
Snoqualmie Pass 3000' 4000' 6500' 7500' 7500' 7000' 7000' 6500'
East North 2000' 0 1000' 2500' 1000' 0 2000' 5000'
East Central 2000' 0 1000' 2500' 1000' 0 2000' 4000'
East South 2000' 0 1000' 4500' 3000' 3000' 3000' 5500'
Mt. Hood 3000' 4000' 4500' 10000' 9000' 9000' 8000' 7500'
Olympics Elevation
Friday Evening* 9000'
Friday Night* 9000'
Saturday Morning* 8500'
Saturday Afternoon* 8500'
Saturday Evening* 8500'
Saturday Night* 8000'
Sunday Morning 7500'
Sunday Afternoon 7000'
West North Elevation
Friday Evening* 8000'
Friday Night* 8000'
Saturday Morning* 8000'
Saturday Afternoon* 8000'
Saturday Evening* 8000'
Saturday Night* 7500'
Sunday Morning 7000'
Sunday Afternoon 6000'
West Central Elevation
Friday Evening* 7000'
Friday Night* 7000'
Saturday Morning* 8000'
Saturday Afternoon* 8000'
Saturday Evening* 8000'
Saturday Night* 7500'
Sunday Morning 7500'
Sunday Afternoon 7000'
West South Elevation
Friday Evening* 7000'
Friday Night* 8000'
Saturday Morning* 9000'
Saturday Afternoon* 9000'
Saturday Evening* 9000'
Saturday Night* 8000'
Sunday Morning 7500'
Sunday Afternoon 7000'
Stevens Pass Elevation
Friday Evening* 3000'
Friday Night* 2000'
Saturday Morning* 3500'
Saturday Afternoon* 4000'
Saturday Evening* 4000'
Saturday Night* 3000'
Sunday Morning 4000'
Sunday Afternoon 5000'
Snoqualmie Pass Elevation
Friday Evening* 3000'
Friday Night* 4000'
Saturday Morning* 6500'
Saturday Afternoon* 7500'
Saturday Evening* 7500'
Saturday Night* 7000'
Sunday Morning 7000'
Sunday Afternoon 6500'
East North Elevation
Friday Evening* 2000'
Friday Night* 0'
Saturday Morning* 1000'
Saturday Afternoon* 2500'
Saturday Evening* 1000'
Saturday Night* 0'
Sunday Morning 2000'
Sunday Afternoon 5000'
East Central Elevation
Friday Evening* 2000'
Friday Night* 0'
Saturday Morning* 1000'
Saturday Afternoon* 2500'
Saturday Evening* 1000'
Saturday Night* 0'
Sunday Morning 2000'
Sunday Afternoon 4000'
East South Elevation
Friday Evening* 2000'
Friday Night* 0'
Saturday Morning* 1000'
Saturday Afternoon* 4500'
Saturday Evening* 3000'
Saturday Night* 3000'
Sunday Morning 3000'
Sunday Afternoon 5500'
Mt. Hood Elevation
Friday Evening* 3000'
Friday Night* 4000'
Saturday Morning* 4500'
Saturday Afternoon* 10000'
Saturday Evening* 9000'
Saturday Night* 9000'
Sunday Morning 8000'
Sunday Afternoon 7500'

5000' Temperatures (°F)

Friday Night Saturday
Max / Min Max / Min
Olympics 37 / 33 44 / 33
West North 36 / 30 40 / 31
West Central 36 / 30 40 / 32
West South 33 / 27 44 / 29
Stevens Pass 23 / 18 33 / 20
Snoqualmie Pass 25 / 22 35 / 24
East North 21 / 12 31 / 19
East Central 22 / 16 31 / 20
East South 23 / 19 35 / 22
Mt. Hood 27 / 22 37 / 24
Olympics 5000' Temperature Forecast
(Max / Min)
Friday Night 37 / 33
Saturday 44 / 33
West North 5000' Temperature Forecast
(Max / Min)
Friday Night 36 / 30
Saturday 40 / 31
West Central 5000' Temperature Forecast
(Max / Min)
Friday Night 36 / 30
Saturday 40 / 32
West South 5000' Temperature Forecast
(Max / Min)
Friday Night 33 / 27
Saturday 44 / 29
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Friday Night 23 / 18
Saturday 33 / 20
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Friday Night 25 / 22
Saturday 35 / 24
East North 5000' Temperature Forecast
(Max / Min)
Friday Night 21 / 12
Saturday 31 / 19
East Central 5000' Temperature Forecast
(Max / Min)
Friday Night 22 / 16
Saturday 31 / 20
East South 5000' Temperature Forecast
(Max / Min)
Friday Night 23 / 19
Saturday 35 / 22
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Friday Night 27 / 22
Saturday 37 / 24

Ridgeline Winds (mph)

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

Extended Weather Synopsis

That aforementioned weak frontal system will likely bring some cloud cover and perhaps a few sprinkles on Monday with continued mild temperatures.  A fast moving front will arrive on Tuesday, perhaps bringing 0.50-1.00" of water equivalent to the west slopes of the Cascades near and north of Snoqualmie Pass with lower amounts elsewhere.  This front will arrive in westerly flow, and right now it seems to be on the milder side for perhaps everyone except the Mt Baker area. Stay tuned for a more accurate snow level forecast as we move closer in time. 

Forecast models are beginning to show some agreement as we head into Thanksgiving and towards the end of next week, with strong upper level ridging building offshore and milder temperatures entering the region. There's a chance some warm frontal precipitation will glance the area, mainly near the Canadian border as the ridge builds.   

Extended Snow Level (ft)

Sunday Night Monday Monday Night* Tuesday
West North 4500' 5500' 4500' 4000'
Snoqualmie Pass 5500' 6000' 6000' 5000'
Mt. Hood 7000' 7500' 7000' 6500'
West North Elevation
Sunday Night 4500'
Monday 5500'
Monday Night* 4500'
Tuesday 4000'
Snoqualmie Pass Elevation
Sunday Night 5500'
Monday 6000'
Monday Night* 6000'
Tuesday 5000'
Mt. Hood Elevation
Sunday Night 7000'
Monday 7500'
Monday Night* 7000'
Tuesday 6500'

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

Previous forecast from Nov 17, 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