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Mountain Weather Forecast

Issued: 7:23 AM PST Friday, February 9, 2018
by Kenny Kramer

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.

Weather synopsis for Friday & Saturday

Moderate and weakening NW flow is keeping a few light snow showers going along the west slopes early Friday morning, mainly at Stevens and Snoqualmie. Freezing levels dropped sharply overnight behind a weak passing frontal system as the upper flow turned more northerly.

Showers should end later Friday morning as the onshore flow weakens. 

A strong upper ridge of high pressure remains offshore and will keep the Pacific Northwest cool with low freezing levels through Saturday and beyond.

The ridge nudges closer to the coast and builds a little further northward Saturday allowing for clearing skies Friday night and plenty of sunshine for Saturday.

High clouds increase Saturday afternoon and night as a weak disturbance approaches from the northwest.

Weather forecast for Friday & Saturday

Olympics
Date Weather
Friday Partly cloudy in the morning becoming mostly sunny. Cool
Friday Night Mostly clear. Cool.
Saturday Mostly sunny and cool. Increasing high clouds in the afternoon.
Becoming mostly cloudy.
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
Date Weather
Friday Mostly cloudy with scattered light snow showers through midday, mainly in the passes. Becoming partly to mostly cloudy in the afternoon.
Friday Night Mostly clear. Cool.
Saturday Mostly sunny and cool. Increasing high clouds in the afternoon.
Becoming mostly cloudy.
East Slopes of the Washington Cascades
Date Weather
Friday Partly cloudy and cool.
Friday Night Mostly clear and cool.
Saturday Mostly sunny. Cool.
Increasing high clouds becoming mostly cloudy.
Mt. Hood
Date Weather
Friday Mostly sunny and cool.
Friday Night Clear and cool.
Saturday Mostly sunny. Increasing high clouds in the afternoon.
Increasing clouds becoming mostly cloudy.

Snow Level/Freezing Level in feet

Date Olympics Northwest Cascades Northeast Cascades Central Cascades South Cascades Easterly Flow in Passes
Friday Morning Snow Level 1500' 1500' 1000' 2000' 3500'
Friday Afternoon Snow Level 1500' 1000' 1000' 2000' 2500'
Friday Night Freezing Level 1500' 1000' 1000' 1500' 2500'
Saturday Morning Freezing Level 2000' 2000' 3000' 3500' 4000'
Saturday Afternoon Freezing Level 3500' 3000' 3000' 3500' 5500'
Olympics
Date Elevation
Friday Morning Snow Level
1500'
Friday Afternoon Snow Level
1500'
Friday Night Freezing Level
1500'
Saturday Morning Freezing Level
2000'
Saturday Afternoon Freezing Level
3500'
Saturday Night Freezing Level
3000'
Northwest Cascades
Date Elevation
Friday Morning Snow Level
1500'
Friday Afternoon Snow Level
1000'
Friday Night Freezing Level
1000'
Saturday Morning Freezing Level
2000'
Saturday Afternoon Freezing Level
3000'
Saturday Night Freezing Level
1500'
Northeast Cascades
Date Elevation
Friday Morning Snow Level
1000'
Friday Afternoon Snow Level
1000'
Friday Night Freezing Level
1000'
Saturday Morning Freezing Level
3000'
Saturday Afternoon Freezing Level
3000'
Saturday Night Freezing Level
2000'
Central Cascades
Date Elevation
Friday Morning Snow Level
2000'
Friday Afternoon Snow Level
2000'
Friday Night Freezing Level
1500'
Saturday Morning Freezing Level
3500'
Saturday Afternoon Freezing Level
3500'
Saturday Night Freezing Level
2500'
South Cascades
Date Elevation
Friday Morning Snow Level
3500'
Friday Afternoon Snow Level
2500'
Friday Night Freezing Level
2500'
Saturday Morning Freezing Level
4000'
Saturday Afternoon Freezing Level
5500'
Saturday Night Freezing Level
6000'

Cascade Snow / Freezing Levels noted above refer to the north (approximately Mt Baker and Washington Pass), central (approximately Stevens to White Pass) and south (near Mt Hood). Freezing Level is when no precipitation is forecast.
* Note that surface snow levels are common near the passes during easterly pass flow and may result in multiple snow / freezing levels.

24 Hour Quantitative Precipitation ending at 4 am

Location Sat Sun
Hurricane Ridge 0 0
Mt Baker Ski Area lt .10 0
Washington Pass 0 0
Stevens Pass lt .10 0
Snoqualmie Pass lt .10 0
Mission Ridge 0 0
Crystal Mt 0 0
Paradise lt .10 0
White Pass 0 0
Mt Hood Meadows 0 0

Winds in Miles per Hour (MPH) "Cascade Pass Level Winds"

Date Direction - Speed
Friday Morning W 5 - 15
Friday Afternoon W 0 - 10
Friday Night E 0 - 10
Saturday Morning E 0 - 10
Saturday Afternoon W 0 - 10

Directions above indicate the direction the wind blows from on the 16-point cardinal scale. Winds near the passes tend to be highly channeled by the topography and normally blow either easterly or westerly depending on the surface pressure gradients that drive such winds.

Free Winds at 5000' (in Miles per Hour (MPH))

Date Olympics Northwest Cascades Central Cascades South Cascades
Friday Morning NW 5 - 15 NNE 5 - 15 NW 10 - 20 NW 10 - 20
Friday Afternoon NW 5 - 10 NNE 5 - 10 NW 5 - 15 NW 5 - 15
Friday Night NE 10 - 20 NE 10 - 20 NE 5 - 10 NNW 5 - 15
Saturday Morning NE 5 - 15 NE 5 - 10 NE 5 - 10 ENE 5 - 15
Saturday Afternoon WSW 5 - 10 SW 5 - 10 W 5 - 10 SE 5 - 10
Olympics
Date Elevation
Friday Morning NW 5 - 15
Friday Afternoon NW 5 - 10
Friday Night NE 10 - 20
Saturday Morning NE 5 - 15
Saturday Afternoon WSW 5 - 10
Saturday Night W 10 - 20
Northwest Cascades
Date Elevation
Friday Morning NNE 5 - 15
Friday Afternoon NNE 5 - 10
Friday Night NE 10 - 20
Saturday Morning NE 5 - 10
Saturday Afternoon SW 5 - 10
Saturday Night W 5 - 15
Central Cascades
Date Elevation
Friday Morning NW 10 - 20
Friday Afternoon NW 5 - 15
Friday Night NE 5 - 10
Saturday Morning NE 5 - 10
Saturday Afternoon W 5 - 10
Saturday Night W 10 - 20
South Cascades
Date Elevation
Friday Morning NW 10 - 20
Friday Afternoon NW 5 - 15
Friday Night NNW 5 - 15
Saturday Morning ENE 5 - 15
Saturday Afternoon SE 5 - 10
Saturday Night W 5 - 15
Olympics
Date Direction - Speed
Friday Morning NW 5 - 15
Friday Afternoon NW 5 - 10
Friday Night NE 10 - 20
Saturday Morning NE 5 - 15
Saturday Afternoon WSW 5 - 10
Saturday Night W 10 - 20
Northwest Cascades
Date Direction - Speed
Friday Morning NNE 5 - 15
Friday Afternoon NNE 5 - 10
Friday Night NE 10 - 20
Saturday Morning NE 5 - 10
Saturday Afternoon SW 5 - 10
Saturday Night W 5 - 15
Central Cascades
Date Direction - Speed
Friday Morning NW 10 - 20
Friday Afternoon NW 5 - 15
Friday Night NE 5 - 10
Saturday Morning NE 5 - 10
Saturday Afternoon W 5 - 10
Saturday Night W 10 - 20
South Cascades
Date Direction - Speed
Friday Morning NW 10 - 20
Friday Afternoon NW 5 - 15
Friday Night NNW 5 - 15
Saturday Morning ENE 5 - 15
Saturday Afternoon SE 5 - 10
Saturday Night W 5 - 15

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' (in Miles per Hour (MPH))

Date Northwest Cascades Northeast Cascades Central Cascades South Cascades
Friday Morning NW 25 - 35 NW 25 - 35 NW 30 - 40 NW 40 - 50
Friday Afternoon NNW 10 - 20 NNW 15 - 25 NW 25 - 35 NW 30 - 40
Friday Night NNE 10 - 20 NNE 15 - 25 NNW 15 - 25 NNW 20 - 30
Saturday Morning N 15 - 25 N 15 - 25 N 15 - 25 NNE 20 - 30
Saturday Afternoon NW 20 - 30 NW 20 - 30 NW 15 - 25 N 10 - 20
Northwest Cascades
Date Direction - Speed
Friday Morning NW 25 - 35
Friday Afternoon NNW 10 - 20
Friday Night NNE 10 - 20
Saturday Morning N 15 - 25
Saturday Afternoon NW 20 - 30
Saturday Night W 25 - 35
Northeast Cascades
Date Direction - Speed
Friday Morning NW 25 - 35
Friday Afternoon NNW 15 - 25
Friday Night NNE 15 - 25
Saturday Morning N 15 - 25
Saturday Afternoon NW 20 - 30
Saturday Night W 25 - 35
Central Cascades
Date Direction - Speed
Friday Morning NW 30 - 40
Friday Afternoon NW 25 - 35
Friday Night NNW 15 - 25
Saturday Morning N 15 - 25
Saturday Afternoon NW 15 - 25
Saturday Night W 25 - 35
South Cascades
Date Direction - Speed
Friday Morning NW 40 - 50
Friday Afternoon NW 30 - 40
Friday Night NNW 20 - 30
Saturday Morning NNE 20 - 30
Saturday Afternoon N 10 - 20
Saturday Night W 25 - 35

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.

The Extended Mountain Weather Forecast (Days 3-5) will be included with the afternoon forecast issuance between 2 - 3 PM.