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Mountain Weather Forecast

Issued: 4:02 PM PST Saturday, April 14, 2018
by Robert Hahn

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

Weather Synopsis for Saturday & Sunday

A cool upper trough will drop SE from the Gulf of Alaska on Saturday, while out ahead of it, a frontal wave is currently moving NE along a stalled frontal boundary with copious moisture heading for the Washington Cascades and Olympics as of mid-afternoon on Saturday. Rain and snow previously focused on a more narrow band over the central Cascades is expected to fill in throughout the Washington Cascades, with significant precipitation spilling over to the east slopes of the Cascades. Mild temperatures will keep snow levels above pass level and temperatures are particularly warm along the east slopes of the Cascades associated with subsidence warm. Mazama reached 61F on Saturday afternoon.

The front will push south and east late Saturday night, shifting the precipitation south to the Mt. Hood area, but it will not bring much more than diurnal cooling.

As the upper trough moves into our offshore waters on Sunday, a new surface feature will slide north, extending light to moderate rain and snow showers throughout the Cascades. Expect some convection with cool air aloft as the upper level trough continues moving into the region. 

Sunday night the upper low moves near the Washington/Oregon coastline, bringing cooling. The northward exit of the surface feature, will allow moderate Westerly flow to develop over our region.

 

Weather forecast

Olympics
Saturday Light rain or snow.
Saturday Night Light rain or snow during the evening with mostly high clouds after midnight.
Sunday Filtered sunlight with cumulus clouds building during the afternoon and a chance of a rain or snow shower.
A chance of light rain or snow showers. Cooler.
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
Saturday Increasing moderate to heavy rain and snow spreading throughout the Cascades.
Saturday Night Moderate to occasionally heavy rain and snow during the evening hours. Becoming light rain and snow showers after midnight.
Sunday Mostly cloudy with high clouds above with light rain and snow spreading from south to north during the afternoon. Heaviest precipitation in the south. Expect some convective precipitation with locally heavy amounts in the afternoon.
Light rain and snow showers with locally heavier amounts.
East Slopes of the Washington Cascades
Saturday Decreasing light to moderate rain and snow central and south Cascades in the morning, with mostly light rain or snow north. Increasing moderate rain and snow spreading throughout the Cascades in the afternoon.
Saturday Night Moderate rain and snow during the evening hours. Becoming light rain and snow showers mainly near the Cascade crest after midnight.
Sunday Mostly cloudy with high clouds above with light rain and snow spreading from south to north during the afternoon. Heaviest precipitation in the south. Expect some convective precipitation with locally heavy amounts in the afternoon.
Light rain and snow showers with locally heavier amounts.
Mt. Hood
Saturday Mostly cloudy with a chance of a light rain or snow shower, particularly late in the day.
Saturday Night Light rain and snow.
Sunday Light to moderate rain and snow developing. Convection likely during the afternoon.
Light to occasionally moderate rain and snow showers.

Snow/Freezing Level (ft)

Hurricane Ridge Mt. Baker Washington Pass Stevens Pass Snoqualmie Pass Leavenworth Mt. Rainier, Crystal & White Pass Mt. Hood
Saturday Afternoon Snow Level 3500' 4000' 5000' None' 5000' None' None' 5500'
Saturday Night Snow Level 2500' 3000' 3500' None' 4000' None' None' 4500'
Sunday Morning Snow Level 2500' 3500' 4500' None' 4000' None' None' 5000'
Sunday Afternoon Snow Level 3000' 4000' 5000' None' 4500' None' None' 4500'
Hurricane Ridge Elevation
Saturday Afternoon Snow Level
3500'
Saturday Night Snow Level
2500'
Sunday Morning Snow Level
2500'
Sunday Afternoon Snow Level
3000'
Sunday Night Snow Level
3000'
Mt. Baker Elevation
Saturday Afternoon Snow Level
4000'
Saturday Night Snow Level
3000'
Sunday Morning Snow Level
3500'
Sunday Afternoon Snow Level
4000'
Sunday Night Snow Level
3000'
Washington Pass Elevation
Saturday Afternoon Snow Level
5000'
Saturday Night Snow Level
3500'
Sunday Morning Snow Level
4500'
Sunday Afternoon Snow Level
5000'
Sunday Night Snow Level
4000'
Stevens Pass Elevation
Saturday Afternoon Snow Level
None'
Saturday Night Snow Level
None'
Sunday Morning Snow Level
None'
Sunday Afternoon Snow Level
None'
Sunday Night Snow Level
None'
Snoqualmie Pass Elevation
Saturday Afternoon Snow Level
5000'
Saturday Night Snow Level
4000'
Sunday Morning Snow Level
4000'
Sunday Afternoon Snow Level
4500'
Sunday Night Snow Level
3000'
Leavenworth Elevation
Saturday Afternoon Snow Level
None'
Saturday Night Snow Level
None'
Sunday Morning Snow Level
None'
Sunday Afternoon Snow Level
None'
Sunday Night Snow Level
None'
Mt. Rainier & Crystal Elevation
Saturday Afternoon Snow Level
None'
Saturday Night Snow Level
None'
Sunday Morning Snow Level
None'
Sunday Afternoon Snow Level
None'
Sunday Night Snow Level
None'
Mt. Hood Elevation
Saturday Afternoon Snow Level
5500'
Saturday Night Snow Level
4500'
Sunday Morning Snow Level
5000'
Sunday Afternoon Snow Level
4500'
Sunday Night Snow Level
2500'

* 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 - 0.50 0.25
Mt Baker Ski Area 1.00 - 1.50 0.50
Washington Pass 0.50 - 0.70 0.50 - 0.75
Stevens Pass 1.00 0.50
Snoqualmie Pass 1.00 - 1.50 0.50 - 0.75
Mission Ridge LT 0.25 0.25 - 0.50
Crystal Mt 0.50 - 0.75 0.50
Paradise 1.50 0.75
White Pass 0.25 - 0.50 0.50
Mt Hood Meadows 0.25 0.75
0.25 0.75 - 1.00
Hurricane Ridge Precipitation Forecast
Sunday 0.25 - 0.50
Monday 0.25
Mt Baker Ski Area Precipitation Forecast
Sunday 1.00 - 1.50
Monday 0.50
Washington Pass Precipitation Forecast
Sunday 0.50 - 0.70
Monday 0.50 - 0.75
Stevens Pass Precipitation Forecast
Sunday 1.00
Monday 0.50
Snoqualmie Pass Precipitation Forecast
Sunday 1.00 - 1.50
Monday 0.50 - 0.75
Mission Ridge Precipitation Forecast
Sunday LT 0.25
Monday 0.25 - 0.50
Crystal Mt Precipitation Forecast
Sunday 0.50 - 0.75
Monday 0.50
Paradise Precipitation Forecast
Sunday 1.50
Monday 0.75
White Pass Precipitation Forecast
Sunday 0.25 - 0.50
Monday 0.50
Mt Hood Meadows Precipitation Forecast
Sunday 0.25
Monday 0.75
Timberline Precipitation Forecast
Sunday 0.25
Monday 0.75 - 1.00

Free Winds at 5000' (mph)

Hurricane Ridge Mt. Baker Stevens to Snoqualmie Pass Mt. Rainier Mt. Hood
Saturday Afternoon SW 10 - 20 S 5 - 15 S 10 - 20 --- None - None SW 20 - 30
Saturday Night WSW 0 - 10 S 0 - 10 W 5 - 15 --- None - None WSW 15 - 25
Sunday Morning E 5 - 15 E 5 - 15 E 5 - 15 --- None - None S 10 - 20
Sunday Afternoon N 5 - 15 N 5 - 15 VAR 0 - 10 --- None - None W 5 - 15
Hurricane Ridge Elevation
Saturday Afternoon SW 10 - 20
Saturday Night WSW 0 - 10
Sunday Morning E 5 - 15
Sunday Afternoon N 5 - 15
Sunday Night W 10 - 20
Mt. Baker Elevation
Saturday Afternoon S 5 - 15
Saturday Night S 0 - 10
Sunday Morning E 5 - 15
Sunday Afternoon N 5 - 15
Sunday Night WSW 5 - 15
Stevens and Snoqualmie Pass Elevation
Saturday Afternoon S 10 - 20
Saturday Night W 5 - 15
Sunday Morning E 5 - 15
Sunday Afternoon VAR 0 - 10
Sunday Night W 15 - 25
Mt. Rainier Elevation
Saturday Afternoon --- None - None
Saturday Night --- None - None
Sunday Morning --- None - None
Sunday Afternoon --- None - None
Sunday Night --- None - None
Mt. Hood Elevation
Saturday Afternoon SW 20 - 30
Saturday Night WSW 15 - 25
Sunday Morning S 10 - 20
Sunday Afternoon W 5 - 15
Sunday Night W 20 - 30
Hurricane Ridge Direction - Speed
Saturday Afternoon SW 10 - 20
Saturday Night WSW 0 - 10
Sunday Morning E 5 - 15
Sunday Afternoon N 5 - 15
Sunday Night W 10 - 20
Mt. Baker Direction - Speed
Saturday Afternoon S 5 - 15
Saturday Night S 0 - 10
Sunday Morning E 5 - 15
Sunday Afternoon N 5 - 15
Sunday Night WSW 5 - 15
Stevens and Snoqualmie Pass Direction - Speed
Saturday Afternoon S 10 - 20
Saturday Night W 5 - 15
Sunday Morning E 5 - 15
Sunday Afternoon VAR 0 - 10
Sunday Night W 15 - 25
Mt. Rainier Direction - Speed
Saturday Afternoon --- None - None
Saturday Night --- None - None
Sunday Morning --- None - None
Sunday Afternoon --- None - None
Sunday Night --- None - None
Mt. Hood Direction - Speed
Saturday Afternoon SW 20 - 30
Saturday Night WSW 15 - 25
Sunday Morning S 10 - 20
Sunday Afternoon W 5 - 15
Sunday Night W 20 - 30

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 Afternoon WSW 15 - 25 WSW 10 - 20 WSW 45 - 65 --- None - None WSW 30 - 40
Saturday Night SW 15 - 25 SW 20 - 30 SW 25 - 35 --- None - None SW 30 - 40
Sunday Morning SE 10 - 20 SE 10 - 20 ESE 20 - 30 --- None - None SW 30 - 40
Sunday Afternoon ESE 15 - 25 SE 15 - 25 SSE 20 - 30 --- None - None SSW 20 - 30
Mt. Baker Direction - Speed
Saturday Afternoon WSW 15 - 25
Saturday Night SW 15 - 25
Sunday Morning SE 10 - 20
Sunday Afternoon ESE 15 - 25
Sunday Night W 10 - 20
Washington Pass Direction - Speed
Saturday Afternoon WSW 10 - 20
Saturday Night SW 20 - 30
Sunday Morning SE 10 - 20
Sunday Afternoon SE 15 - 25
Sunday Night WNW 15 - 25
Stevens and Snoqualmie Pass Direction - Speed
Saturday Afternoon WSW 45 - 65
Saturday Night SW 25 - 35
Sunday Morning ESE 20 - 30
Sunday Afternoon SSE 20 - 30
Sunday Night W 20 - 30
Mt. Rainier Direction - Speed
Saturday Afternoon --- None - None
Saturday Night --- None - None
Sunday Morning --- None - None
Sunday Afternoon --- None - None
Sunday Night --- None - None
Mt. Hood Direction - Speed
Saturday Afternoon WSW 30 - 40
Saturday Night SW 30 - 40
Sunday Morning SW 30 - 40
Sunday Afternoon SSW 20 - 30
Sunday Night W 30 - 40

Extended Weather Synopsis for Monday night through Wednesday

The upper-level low crosses the Cascades on Monday morning with cool air continuing to spread into the region and a moist westerly flow bringing light to moderate precipitation, particularly to the west slopes of the Cascades at relatively low snow levels on Monday. Monday night, the moist flow with moderate precipitation on the Cascade west slopes continues with snow levels in the Cascades below pass level.

Tuesday stays cool. Weak ridging develops and makes the precipitation more scattered, with some convergence likely. Precipitation generally shuts off and with clearing skies, mountain temperatures will be quite cool.

On Wednesday, easterly flow develops over our region as a Pacific System drops south toward California.

 

Extended Weather

Olympics, Washington Cascades and Mt. Hood Area
Monday Light to moderate rain and snow with moderate westerly flow\, possibly becoming moderate to heavy overnight Monday. Cooler than seasonal norms.
Tuesday Decreasing light rain and snow showers, heaviest in convergence. Snow showers and convergence ending around midnight, followed by clearing skies and cool temperatures. Cooler than seasonal norms.

Extended Snow/Freezing Levels

Mt. Baker Snoqualmie Pass Mt. Hood Easterly Flow *
Monday Snow Level 2500' - 3500' 2500' - 3500' 2000' - 3000'
Monday Night Snow Level 2000' - 3000' 2000' - 3000' 2000' - 3000'
Tuesday Snow Level 2000' - 3000' 2500' - 3500' 2000' - 3000'
Tuesday Night Snow Level 1000' - 2000' 1000' - 2000' 1500' - 2500'
Mt. Baker Elevation
Monday Snow Level
2500' - 3500'
Monday Night Snow Level
2000' - 3000'
Tuesday Snow Level
2000' - 3000'
Tuesday Night Snow Level
1000' - 2000'
Wednesday Snow Level
3000' - 4000'
Snoqualmie Pass Elevation
Monday Snow Level
2500' - 3500'
Monday Night Snow Level
2000' - 3000'
Tuesday Snow Level
2500' - 3500'
Tuesday Night Snow Level
1000' - 2000'
Wednesday Snow Level
3000' - 4000'
Mt. Hood Elevation
Monday Snow Level
2000' - 3000'
Monday Night Snow Level
2000' - 3000'
Tuesday Snow Level
2000' - 3000'
Tuesday Night Snow Level
1500' - 2500'
Wednesday Snow Level
3500' - 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.

Previous forecast from April 13, 2018

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

April 14th marks the last regularly scheduled mountain weather forecast issuance for the 2017-2018 season. 

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.