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Mountain Weather Forecast

Issued: 3:09 PM PST Thursday, February 8, 2018
by Kenny Kramer

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

Weather Synopsis for Thursday & Friday

Strong WNW flow near and above crest level persists across the Pacific Northwest Thursday afternoon. The region is being squeezed between an upper ridge offshore and a trough across western Canada, thus tightening the gradients over the forecast area.

A  weak frontal boundary moved across the region early Thursday causing a period of mostly light precipitation at high freezing levels. Low level moisture is now being lifted along the west slopes in moderate onshore flow, maintaining light precipitation along the west slopes and over the volcanoes.

Little moisture will make it much further south than about Mt Rainier Thursday afternoon and night.

The greatest expected precipitation will be over the Stevens to Snoqualmie Pass area in an active convergence zone which should gradually weaken Thursday night. 

Freezing levels remain relatively high Thursday afternoon and should lower significantly in the wake of the passing disturbance Thursday evening and overnight.

The ridge offshore gains strength Friday and turns the upper level flow to a more northerly direction. This should cause further cooling but more drying with only a few scattered showers expected Friday.

Weather Forecast

Olympics
Thursday Afternoon Partly cloudy in the afternoon. Strong ridgetop W winds.
Thursday Night Becoming mostly clear. Moderate ridgetop W winds.
Friday Partly cloudy and cool.
Mostly clear. Cool.
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
Thursday Afternoon Periods of light or moderate rain and snow showers with slowly lowering snow levels. Heaviest rain or snow in convergence near Stevens Pass to Snoqualmie Pass. Cloudy with occasional light rain or snow in the southern part south of about Mt Rainier. Moderate to strong W-SW crest-level winds.
Thursday Night Showers diminishing in the passes. Otherwise, mostly cloudy, with westerly winds decreasing.
Friday Partly cloudy and cool.
Mostly clear and cool.
East Slopes of the Washington Cascades
Thursday Afternoon Mostly cloudy with light rain or snow showers, mainly nearer the crest. Filtered sunshine away from the crest.
Thursday Night Partly cloudy and cool.
Friday Mostly sunny and cool.
Mostly clear and cool.
Mt. Hood
Thursday Afternoon Increasing clouds.
Thursday Night Mostly cloudy. Gradual cooling
Friday Mostly sunny and cool.
Clear and cool.

Snow/Freezing Level (ft)

Hurricane Ridge Mt. Baker Washington Pass Leavenworth Stevens Pass Snoqualmie Pass Mt. Rainier, Crystal & White Pass Mt. Hood
Thursday Afternoon Snow Level 3500' 3500' 3500' None' None' 4000' None' 7500'
Thursday Night Snow Level 2500' 2000' 2000' None' None' 2500' None' 6000'
Friday Morning Snow Level 2000' 1500' 1500' None' None' 2000' None' 3000'
Friday Afternoon Snow Level 2000' 1500' 1500' None' None' 2000' None' 3000'
Hurricane Ridge Elevation
Thursday Afternoon Snow Level
3500'
Thursday Night Snow Level
2500'
Friday Morning Snow Level
2000'
Friday Afternoon Snow Level
2000'
Friday Night Snow Level
1500'
Mt. Baker Elevation
Thursday Afternoon Snow Level
3500'
Thursday Night Snow Level
2000'
Friday Morning Snow Level
1500'
Friday Afternoon Snow Level
1500'
Friday Night Snow Level
500'
Washington Pass Elevation
Thursday Afternoon Snow Level
3500'
Thursday Night Snow Level
2000'
Friday Morning Snow Level
1500'
Friday Afternoon Snow Level
1500'
Friday Night Snow Level
500'
Leavenworth Elevation
Thursday Afternoon Snow Level
None'
Thursday Night Snow Level
None'
Friday Morning Snow Level
None'
Friday Afternoon Snow Level
None'
Friday Night Snow Level
None'
Stevens Pass Elevation
Thursday Afternoon Snow Level
None'
Thursday Night Snow Level
None'
Friday Morning Snow Level
None'
Friday Afternoon Snow Level
None'
Friday Night Snow Level
None'
Snoqualmie Pass Elevation
Thursday Afternoon Snow Level
4000'
Thursday Night Snow Level
2500'
Friday Morning Snow Level
2000'
Friday Afternoon Snow Level
2000'
Friday Night Snow Level
2000'
Mt. Rainier & Crystal Elevation
Thursday Afternoon Snow Level
None'
Thursday Night Snow Level
None'
Friday Morning Snow Level
None'
Friday Afternoon Snow Level
None'
Friday Night Snow Level
None'
Mt. Hood Elevation
Thursday Afternoon Snow Level
7500'
Thursday Night Snow Level
6000'
Friday Morning Snow Level
3000'
Friday Afternoon Snow Level
3000'
Friday Night Snow Level
2000'

* 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

Friday Saturday
Hurricane Ridge LT 0.10 0
Mt Baker Ski Area 0.50 LT 0.10
Washington Pass 0.25 0
Stevens Pass 0.75 LT 0.10
Snoqualmie Pass 0.50 LT 0.10
Mission Ridge 0 0
Crystal Mt LT 0.10 0
Paradise 0.25 - 0.50 LT 0.10
White Pass LT 0.10 0
Mt Hood Meadows LT 0.10 0
LT 0.10 0
Hurricane Ridge Precipitation Forecast
Friday LT 0.10
Saturday 0
Mt Baker Ski Area Precipitation Forecast
Friday 0.50
Saturday LT 0.10
Washington Pass Precipitation Forecast
Friday 0.25
Saturday 0
Stevens Pass Precipitation Forecast
Friday 0.75
Saturday LT 0.10
Snoqualmie Pass Precipitation Forecast
Friday 0.50
Saturday LT 0.10
Mission Ridge Precipitation Forecast
Friday 0
Saturday 0
Crystal Mt Precipitation Forecast
Friday LT 0.10
Saturday 0
Paradise Precipitation Forecast
Friday 0.25 - 0.50
Saturday LT 0.10
White Pass Precipitation Forecast
Friday LT 0.10
Saturday 0
Mt Hood Meadows Precipitation Forecast
Friday LT 0.10
Saturday 0
Timberline Precipitation Forecast
Friday LT 0.10
Saturday 0

Free Winds at 5000' (mph)

Hurricane Ridge Mt. Baker Stevens to Snoqualmie Pass Mt. Rainier Mt. Hood
Thursday Afternoon W 15 - 25 W 15 - 25 W 20 - 30 --- None - None WNW 15 - 25
Thursday Night WNW 10 - 20 WNW 10 - 20 WNW 15 - 25 --- None - None WNW 15 - 25
Friday Morning N 5 - 10 NNE 5 - 10 NW 10 - 20 --- None - None NW 5 - 15
Friday Afternoon N 5 - 10 NE 5 - 15 NW 5 - 15 --- None - None NW 5 - 15
Hurricane Ridge Elevation
Thursday Afternoon W 15 - 25
Thursday Night WNW 10 - 20
Friday Morning N 5 - 10
Friday Afternoon N 5 - 10
Friday Night NE 10 - 20
Mt. Baker Elevation
Thursday Afternoon W 15 - 25
Thursday Night WNW 10 - 20
Friday Morning NNE 5 - 10
Friday Afternoon NE 5 - 15
Friday Night NE 10 - 20
Stevens and Snoqualmie Pass Elevation
Thursday Afternoon W 20 - 30
Thursday Night WNW 15 - 25
Friday Morning NW 10 - 20
Friday Afternoon NW 5 - 15
Friday Night NE 5 - 15
Mt. Rainier Elevation
Thursday Afternoon --- None - None
Thursday Night --- None - None
Friday Morning --- None - None
Friday Afternoon --- None - None
Friday Night --- None - None
Mt. Hood Elevation
Thursday Afternoon WNW 15 - 25
Thursday Night WNW 15 - 25
Friday Morning NW 5 - 15
Friday Afternoon NW 5 - 15
Friday Night NE 5 - 15
Hurricane Ridge Direction - Speed
Thursday Afternoon W 15 - 25
Thursday Night WNW 10 - 20
Friday Morning N 5 - 10
Friday Afternoon N 5 - 10
Friday Night NE 10 - 20
Mt. Baker Direction - Speed
Thursday Afternoon W 15 - 25
Thursday Night WNW 10 - 20
Friday Morning NNE 5 - 10
Friday Afternoon NE 5 - 15
Friday Night NE 10 - 20
Stevens and Snoqualmie Pass Direction - Speed
Thursday Afternoon W 20 - 30
Thursday Night WNW 15 - 25
Friday Morning NW 10 - 20
Friday Afternoon NW 5 - 15
Friday Night NE 5 - 15
Mt. Rainier Direction - Speed
Thursday Afternoon --- None - None
Thursday Night --- None - None
Friday Morning --- None - None
Friday Afternoon --- None - None
Friday Night --- None - None
Mt. Hood Direction - Speed
Thursday Afternoon WNW 15 - 25
Thursday Night WNW 15 - 25
Friday Morning NW 5 - 15
Friday Afternoon NW 5 - 15
Friday Night NE 5 - 15

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.

Free Winds at 9000' (mph)

Mt. Baker Washington Pass Stevens to Snoqualmie Pass Mt. Rainier Mt. Hood
Thursday Afternoon WNW 30 - 40 WNW 35 - 50 WNW 40 - 60 --- None - None WNW 40 - 60
Thursday Night WNW 15 - 25 WNW 30 - 40 WNW 35 - 50 --- None - None WNW 40 - 60
Friday Morning NW 15 - 25 NW 15 - 25 NW 30 - 40 --- None - None NW 30 - 40
Friday Afternoon NNW 15 - 25 NNW 20 - 30 NW 15 - 25 --- None - None NW 30 - 40
Mt. Baker Direction - Speed
Thursday Afternoon WNW 30 - 40
Thursday Night WNW 15 - 25
Friday Morning NW 15 - 25
Friday Afternoon NNW 15 - 25
Friday Night NNE 10 - 20
Washington Pass Direction - Speed
Thursday Afternoon WNW 35 - 50
Thursday Night WNW 30 - 40
Friday Morning NW 15 - 25
Friday Afternoon NNW 20 - 30
Friday Night NNE 10 - 20
Stevens and Snoqualmie Pass Direction - Speed
Thursday Afternoon WNW 40 - 60
Thursday Night WNW 35 - 50
Friday Morning NW 30 - 40
Friday Afternoon NW 15 - 25
Friday Night N 10 - 20
Mt. Rainier Direction - Speed
Thursday Afternoon --- None - None
Thursday Night --- None - None
Friday Morning --- None - None
Friday Afternoon --- None - None
Friday Night --- None - None
Mt. Hood Direction - Speed
Thursday Afternoon WNW 40 - 60
Thursday Night WNW 40 - 60
Friday Morning NW 30 - 40
Friday Afternoon NW 30 - 40
Friday Night NNW 10 - 20

Extended Weather Synopsis for Saturday night through Monday

The region should be dominated by cool and dry northerly flow aloft on Saturday, being on the downwind side of the upper ridge offshore. This should provide a mostly fair and cool day Saturday.

There remains a great deal of uncertainty in the computer weather models regarding an expected disturbance to impact the region Sunday. One strong case tracks the system from off Vancouver Island early Sunday southward, mostly offshore, providing only a glancing blow. Another solution is to move the disturbance across the region. Either way, it is not a strong system, but the details remain uncertain. Whatever precipitation received should fall with relatively low freezing levels.

The ridge offshore should rebound Monday to bring a cool and drier NNE flow. Showers should end early Monday with gradual clearing.

 

Extended Weather

Olympics, Washington Cascades and Mt. Hood Area
Saturday A mostly sunny day and clear night Saturday and Saturday night. Cool.
Sunday Cloudy with periods of light to briefly moderate snow beginning in the north part early Sunday and tracking southward through the day. Track of disturbance remains uncertain.

Extended Snow/Freezing Levels

Mt. Baker Snoqualmie Pass Mt. Hood Easterly Flow *
Saturday Freezing Level 1500' - 3500' 3000' - 5000' 3000' - 5000'
Saturday Night Freezing Level 1500' - 2500' 3500' - 5000' 4500' - 6000'
Sunday Snow Level 500' - 1500' 1000' - 2500' 3000' - 4000'
Sunday Night Snow Level 500' - 1500' 1500' - 2500' 2000' - 3000'
Mt. Baker Elevation
Saturday Freezing Level
1500' - 3500'
Saturday Night Freezing Level
1500' - 2500'
Sunday Snow Level
500' - 1500'
Sunday Night Snow Level
500' - 1500'
Monday Snow Level
2000' - 3500'
Snoqualmie Pass Elevation
Saturday Freezing Level
3000' - 5000'
Saturday Night Freezing Level
3500' - 5000'
Sunday Snow Level
1000' - 2500'
Sunday Night Snow Level
1500' - 2500'
Monday Snow Level
2000' - 3000'
Mt. Hood Elevation
Saturday Freezing Level
3000' - 5000'
Saturday Night Freezing Level
4500' - 6000'
Sunday Snow Level
3000' - 4000'
Sunday Night Snow Level
2000' - 3000'
Monday Snow Level
2000' - 3000'

* 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.

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

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