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Mountain Weather Forecast

Issued: 8:08 AM PST Saturday, April 29, 2017
by Kenny Kramer

Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k

Weather Synopsis for Saturday & Sunday

An upper level ridge of high pressure is weakening along the coast early Saturday as a cold front approaches from the west. A deck of high clouds has spread rapidly across the Olympics and NW Washington early Saturday and will cover the remainder of the forecast area through the day Saturday. The front should bring light precipitation initially to the Olympics and NW Washington Cascades Saturday afternoon.

The main frontal passage should move across the Cascade crest before midnight, and pass the Mt Hood area early Sunday morning.  A period of moderate precipitation should accompany the frontal passage with showers following by early Sunday. Freezing levels rise modestly overnight and cool behind the front by early Sunday.

Onshore flow should maintain showers, mainly along the west slope Cascade areas early Sunday and diminish or end during the day Sunday.

Upper level high pressure begins to rebuild along the coast Sunday night to allow for a cool but drying NW flow aloft. 

Weather forecast

Olympics
Saturday Morning

Increasing high clouds becoming mostly cloudy.

Saturday Afternoon - Saturday Night

Light rain and snow developing Saturday afternoon. Light to briefly moderate rain and snow Saturday night, changing to showers late.

Sunday

Partly to mostly cloudy with light rain and snow showers. Showers diminishing or ending afternoon.

Diminishing clouds becoming partly to mostly clear.

Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
Saturday

Increasing high clouds early. Clouds lowering in the north with a chance of light rain or snow Saturday afternoon.

Saturday Afternoon - Saturday Night

Light rain and snow developing in the north Saturday afternoon and in the central and south by evening or early Saturday night. Light to briefly moderate rain and snow Saturday night. Rain and snow changing to showers late night.

Sunday

Partly to mostly cloudy with light rain and snow showers. Showers diminishing or ending afternoon.

Diminishing clouds becoming partly cloudy.

East slopes of the Washington Cascades
Saturday

Increasing high clouds.

Saturday Night

Periods of light rain and snow, changing to light showers late night.

Sunday

Partly to mostly cloudy with light rain and snow showers at times, mainly nearer the crest. Showers diminishing or ending afternoon.

Becoming mostly clear.

Mt. Hood Area
Saturday

Clear early with increasing high clouds.

Saturday Night

Light rain and snow developing Saturday evening. Light to briefly moderate rain and snow Saturday night.

Sunday

Mostly cloudy with light rain and snow showers early. Showers diminishing or ending afternoon.

Becoming partly to mostly clear.

Snow/Freezing Level (ft)

Hurricane Ridge Mt. Baker Washington Pass Leavenworth Stevens Pass Snoqualmie Pass Mt. Rainier, Crystal & White Pass Mt. Hood
Saturday Morning Freezing Level 5500' 5500' 5500' None' None' 5500' None' 6000'
Saturday Afternoon - Night Snow Level 5500' 5000' 5000' None' None' 5500' None' 6500'
Sunday Morning Snow Level 3000' 3500' 3500' None' None' 3500' None' 4500'
Sunday Afternoon Snow Level 3500' 4000' 4000' None' None' 4000' None' 4500'
Hurricane Ridge Elevation
Saturday Morning Freezing Level
5500'
Saturday Afternoon - Night Snow Level
5500'
Sunday Morning Snow Level
3000'
Sunday Afternoon Snow Level
3500'
Sunday Night Freezing Level
4000'
Mt. Baker Elevation
Saturday Morning Freezing Level
5500'
Saturday Afternoon - Night Snow Level
5000'
Sunday Morning Snow Level
3500'
Sunday Afternoon Snow Level
4000'
Sunday Night Freezing Level
4500'
Washington Pass Elevation
Saturday Morning Freezing Level
5500'
Saturday Afternoon - Night Snow Level
5000'
Sunday Morning Snow Level
3500'
Sunday Afternoon Snow Level
4000'
Sunday Night Freezing Level
4500'
Leavenworth Elevation
Saturday Morning Freezing Level
None'
Saturday Afternoon - Night Snow Level
None'
Sunday Morning Snow Level
None'
Sunday Afternoon Snow Level
None'
Sunday Night Freezing Level
None'
Stevens Pass Elevation
Saturday Morning Freezing Level
None'
Saturday Afternoon - Night Snow Level
None'
Sunday Morning Snow Level
None'
Sunday Afternoon Snow Level
None'
Sunday Night Freezing Level
None'
Snoqualmie Pass Elevation
Saturday Morning Freezing Level
5500'
Saturday Afternoon - Night Snow Level
5500'
Sunday Morning Snow Level
3500'
Sunday Afternoon Snow Level
4000'
Sunday Night Freezing Level
4500'
Mt. Rainier & Crystal Elevation
Saturday Morning Freezing Level
None'
Saturday Afternoon - Night Snow Level
None'
Sunday Morning Snow Level
None'
Sunday Afternoon Snow Level
None'
Sunday Night Freezing Level
None'
Mt. Hood Elevation
Saturday Morning Freezing Level
6000'
Saturday Afternoon - Night Snow Level
6500'
Sunday Morning Snow Level
4500'
Sunday Afternoon Snow Level
4500'
Sunday Night Freezing Level
4500'

* Easterly flow in the Cascade Passes can cause locally lower Snow or Freezing levels than areas further west.
Freezing Level is when no precipitation is forecast.

Precipitation Forecast

Sunday Monday
Hurricane Ridge 0.25 LT 0.10
Mt Baker Ski Area 0.50 LT 0.25
Washington Pass LT 0.25 LT 0.10
Stevens Pass 0.25 LT 0.25
Snoqualmie Pass 0.25 - 0.50 LT 0.25
Mission Ridge 0 LT 0.10
Crystal Mt LT 0.25 LT 0.10
Paradise 0.25 - 0.50 LT 0.25
White Pass LT 0.25 LT 0.10
Mt Hood Meadows 0.25 LT 0.25
0.25 - 0.50 LT 0.25
Hurricane Ridge Precipitation Forecast
Sunday 0.25
Monday LT 0.10
Mt Baker Ski Area Precipitation Forecast
Sunday 0.50
Monday LT 0.25
Washington Pass Precipitation Forecast
Sunday LT 0.25
Monday LT 0.10
Stevens Pass Precipitation Forecast
Sunday 0.25
Monday LT 0.25
Snoqualmie Pass Precipitation Forecast
Sunday 0.25 - 0.50
Monday LT 0.25
Mission Ridge Precipitation Forecast
Sunday 0
Monday LT 0.10
Crystal Mt Precipitation Forecast
Sunday LT 0.25
Monday LT 0.10
Paradise Precipitation Forecast
Sunday 0.25 - 0.50
Monday LT 0.25
White Pass Precipitation Forecast
Sunday LT 0.25
Monday LT 0.10
Mt Hood Meadows Precipitation Forecast
Sunday 0.25
Monday LT 0.25
Timberline Precipitation Forecast
Sunday 0.25 - 0.50
Monday LT 0.25

Free Winds at 5000' (mph)

Hurricane Ridge Mt. Baker Stevens to Snoqualmie Pass Mt. Rainier Mt. Hood
Saturday Morning SW 0 - 10 SW 0 - 10 SW 0 - 10 --- None - None WSW 0 - 10
Saturday Afternoon SSW 20 - 30 SSW 15 - 25 SW 10 - 20 --- None - None WSW 10 - 20
Saturday Night SW 15 - 25 SW 15 - 25 SW 25 - 35 --- None - None SW 25 - 35
Hurricane Ridge Elevation
Saturday Morning SW 0 - 10
Saturday Afternoon SSW 20 - 30
Saturday Night SW 15 - 25
Sunday - Sunday Night W 10 - 20
Mt. Baker Elevation
Saturday Morning SW 0 - 10
Saturday Afternoon SSW 15 - 25
Saturday Night SW 15 - 25
Sunday - Sunday Night W 10 - 20
Stevens and Snoqualmie Pass Elevation
Saturday Morning SW 0 - 10
Saturday Afternoon SW 10 - 20
Saturday Night SW 25 - 35
Sunday - Sunday Night W 15 - 25
Mt. Rainier Elevation
Saturday Morning --- None - None
Saturday Afternoon --- None - None
Saturday Night --- None - None
Sunday - Sunday Night --- None - None
Mt. Hood Elevation
Saturday Morning WSW 0 - 10
Saturday Afternoon WSW 10 - 20
Saturday Night SW 25 - 35
Sunday - Sunday Night W 15 - 25
Hurricane Ridge Direction - Speed
Saturday Morning SW 0 - 10
Saturday Afternoon SSW 20 - 30
Saturday Night SW 15 - 25
Sunday - Sunday Night W 10 - 20
Mt. Baker Direction - Speed
Saturday Morning SW 0 - 10
Saturday Afternoon SSW 15 - 25
Saturday Night SW 15 - 25
Sunday - Sunday Night W 10 - 20
Stevens and Snoqualmie Pass Direction - Speed
Saturday Morning SW 0 - 10
Saturday Afternoon SW 10 - 20
Saturday Night SW 25 - 35
Sunday - Sunday Night W 15 - 25
Mt. Rainier Direction - Speed
Saturday Morning --- None - None
Saturday Afternoon --- None - None
Saturday Night --- None - None
Sunday - Sunday Night --- None - None
Mt. Hood Direction - Speed
Saturday Morning WSW 0 - 10
Saturday Afternoon WSW 10 - 20
Saturday Night SW 25 - 35
Sunday - Sunday Night W 15 - 25

Directions above indicate the direction the wind blows from on the 16-point cardinal scale. These winds and the 9000 ft winds below also indicate "free" winds, or those winds in the atmosphere not influenced by terrain. Topographical effects may produce greater or lower wind speeds in certain locations as well as significant variations in direction.

Free Winds at 9000' (mph)

Mt. Baker Washington Pass Stevens to Snoqualmie Pass Mt. Rainier Mt. Hood
Saturday Morning W 15 - 25 W 5 - 15 W 10 - 20 --- None - None W 10 - 20
Saturday Afternoon - Saturday Night WSW 30 - 40 WSW 30 - 40 WSW 30 - 40 --- None - None WSW 30 - 40
Sunday WNW 15 - 25 WNW 20 - 30 WNW 25 - 35 --- None - None WNW 30 - 40
Mt. Baker Direction - Speed
Saturday Morning W 15 - 25
Saturday Afternoon - Saturday Night WSW 30 - 40
Sunday WNW 15 - 25
Sunday Night NW 5 - 15
Washington Pass Direction - Speed
Saturday Morning W 5 - 15
Saturday Afternoon - Saturday Night WSW 30 - 40
Sunday WNW 20 - 30
Sunday Night NW 5 - 15
Stevens and Snoqualmie Pass Direction - Speed
Saturday Morning W 10 - 20
Saturday Afternoon - Saturday Night WSW 30 - 40
Sunday WNW 25 - 35
Sunday Night NW 15 - 25
Mt. Rainier Direction - Speed
Saturday Morning --- None - None
Saturday Afternoon - Saturday Night --- None - None
Sunday --- None - None
Sunday Night --- None - None
Mt. Hood Direction - Speed
Saturday Morning W 10 - 20
Saturday Afternoon - Saturday Night WSW 30 - 40
Sunday WNW 30 - 40
Sunday Night NW 15 - 25

Directions above indicate the direction the wind blows from on the 16-point cardinal scale. These winds indicate "free" winds, or those winds in the atmosphere not influenced by terrain. Topographical effects may produce greater or lower wind speeds in certain locations as well as significant variations in direction.

Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k

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.

NWAC Spring Forecast Schedule

The NWAC issued daily mountain weather and avalanche forecasts through Saturday, April 15th. Mountain weather and avalanche forecasts will be issued during the spring transition April 20-22nd and April 27-29th. Weekend outlooks will be issued Thursdays, May 4th, 11th, 18th and 25th.