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Mountain Weather Forecast

Issued: 2:40 PM PST Friday, April 21, 2017
by Dennis D'Amico

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

Weather Synopsis for Friday & Saturday

After a relatively cool start this morning with most mountain sites in the mid to upper 20s, freezing levels will peak into the 7500-9000 ft range over the Olympics and Cascades this afternoon. As of 1 PM, many NWAC stations are in the 40s with a few pushing into the 50s as a high amplitude upper level ridge moves over the West Coast. As has been the case with dry weather forecasts as of late, there are a few caveats. The next approaching frontal system should start to spread some high cloud over the area from the SW in the late afternoon/early evening. Also, offshore gradients will increase though the Passes creating locally breezy conditions this afternoon and tonight. Crest level E-SE winds particularly in the southeast/central-east Washington Cascades and the Mt. Hood area will increase overnight as the next Pacific frontal system approaches.

Mid and high level clouds will increase Friday night in advance of the front, but precipitation should hold off until Saturday morning. Rain and snow will lift northeast over the area during the day on Saturday, followed by post-frontal showers late Saturday afternoon/evening. Showers should taper off Saturday night.  

Weather forecast

Olympics
Friday

Mostly sunny. Warmer. Increasing high clouds late in the afternoon. 

Friday Night

Becoming partly to mostly cloudy.

Saturday

Light to occasionally moderate rain and snow developing mid-morning and becoming light rain and snow showers in the afternoon. 

Mostly cloudy with light rain and snow showers tapering down overnight. 

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

Mostly sunny. Warmer. Locally breezy E-SE winds. Increasing high clouds late in the afternoon. 

Friday Night

Becoming partly to mostly cloudy. Locally breezy E-SE winds. 

Saturday

Light rain and snow developing late morning and becoming light to occasionally moderate in the afternoon. A few sunbreaks possible in the southwest Cascades in the afternoon. 

Mostly cloudy with light rain and snow showers tapering down overnight, except occasionally moderate Mt. Baker area. 

East slopes of the Washington Cascades
Friday

Mostly sunny. Warmer. 

Friday Night

Becoming partly cloudy with increasing high clouds. 

Saturday - Saturday Evening

Cloudy with light rain and snow developing late morning, then becoming mostly cloudy with scattered light rain and snow showers in the late afternoon and evening.

 

Partly to mostly cloudy with isolated light rain and snow showers ending in the evening.  

Mt. Hood Area
Friday

Mostly sunny. Warmer. Locally breezy E-SE winds. Increasing high clouds late in the afternoon. 

Friday Night

Becoming partly to mostly cloudy. Locally breezy E-SE winds. 

Saturday

Very light rain and snow developing in the morning and becoming mostly cloudy with scattered light rain and snow showers in the afternoon. 

Mostly cloudy with isolated light rain and snow showers in the evening ending overnight and becoming partly cloudy. 

Snow/Freezing Level (ft)

Hurricane Ridge Mt. Baker Washington Pass Leavenworth Stevens Pass Snoqualmie Pass Mt. Rainier, Crystal & White Pass Mt. Hood
Friday Afternoon - Friday Night Freezing Level* 7500' 7500' 7000' None' None' 7500' None' 8500'
Saturday Snow Level 5500' 5500' 5500' None' None' 5500' None' 6000'
Hurricane Ridge Elevation
Friday Afternoon - Friday Night Freezing Level
7500'
(Easterly Flow *)
Saturday Snow Level
5500'
Saturday Night Snow Level
4000'
Mt. Baker Elevation
Friday Afternoon - Friday Night Freezing Level
7500'
(Easterly Flow *)
Saturday Snow Level
5500'
Saturday Night Snow Level
4000'
Washington Pass Elevation
Friday Afternoon - Friday Night Freezing Level
7000'
(Easterly Flow *)
Saturday Snow Level
5500'
Saturday Night Snow Level
4000'
Leavenworth Elevation
Friday Afternoon - Friday Night Freezing Level
None'
(Easterly Flow *)
Saturday Snow Level
None'
Saturday Night Snow Level
None'
Stevens Pass Elevation
Friday Afternoon - Friday Night Freezing Level
None'
(Easterly Flow *)
Saturday Snow Level
None'
Saturday Night Snow Level
None'
Snoqualmie Pass Elevation
Friday Afternoon - Friday Night Freezing Level
7500'
(Easterly Flow *)
Saturday Snow Level
5500'
Saturday Night Snow Level
4000'
Mt. Rainier & Crystal Elevation
Friday Afternoon - Friday Night Freezing Level
None'
(Easterly Flow *)
Saturday Snow Level
None'
Saturday Night Snow Level
None'
Mt. Hood Elevation
Friday Afternoon - Friday Night Freezing Level
8500'
(Easterly Flow *)
Saturday Snow Level
6000'
Saturday Night Snow 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

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

Free Winds at 5000' (mph)

Hurricane Ridge Mt. Baker Stevens to Snoqualmie Pass Mt. Rainier Mt. Hood
Friday Afternoon SE 10 - 20 E 5 - 15 ESE 15 - 25 --- None - None E 15 - 25
Friday Night - Saturday Morning SE 10 - 20 E 5 - 15 ESE 20 - 35 --- None - None ESE 15 - 30
Saturday Afternoon SSW 15 - 25 S 15 - 25 SW 10 - 20 --- None - None WSW 10 - 20
Hurricane Ridge Elevation
Friday Afternoon SE 10 - 20
Friday Night - Saturday Morning SE 10 - 20
Saturday Afternoon SSW 15 - 25
Saturday Night SW 0 - 10
Mt. Baker Elevation
Friday Afternoon E 5 - 15
Friday Night - Saturday Morning E 5 - 15
Saturday Afternoon S 15 - 25
Saturday Night S 5 - 15
Stevens and Snoqualmie Pass Elevation
Friday Afternoon ESE 15 - 25
Friday Night - Saturday Morning ESE 20 - 35
Saturday Afternoon SW 10 - 20
Saturday Night SW 0 - 10
Mt. Rainier Elevation
Friday Afternoon --- None - None
Friday Night - Saturday Morning --- None - None
Saturday Afternoon --- None - None
Saturday Night --- None - None
Mt. Hood Elevation
Friday Afternoon E 15 - 25
Friday Night - Saturday Morning ESE 15 - 30
Saturday Afternoon WSW 10 - 20
Saturday Night WSW 5 - 15
Hurricane Ridge Direction - Speed
Friday Afternoon SE 10 - 20
Friday Night - Saturday Morning SE 10 - 20
Saturday Afternoon SSW 15 - 25
Saturday Night SW 0 - 10
Mt. Baker Direction - Speed
Friday Afternoon E 5 - 15
Friday Night - Saturday Morning E 5 - 15
Saturday Afternoon S 15 - 25
Saturday Night S 5 - 15
Stevens and Snoqualmie Pass Direction - Speed
Friday Afternoon ESE 15 - 25
Friday Night - Saturday Morning ESE 20 - 35
Saturday Afternoon SW 10 - 20
Saturday Night SW 0 - 10
Mt. Rainier Direction - Speed
Friday Afternoon --- None - None
Friday Night - Saturday Morning --- None - None
Saturday Afternoon --- None - None
Saturday Night --- None - None
Mt. Hood Direction - Speed
Friday Afternoon E 15 - 25
Friday Night - Saturday Morning ESE 15 - 30
Saturday Afternoon WSW 10 - 20
Saturday Night WSW 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' (mph)

Mt. Baker Washington Pass Stevens to Snoqualmie Pass Mt. Rainier Mt. Hood
Friday Afternoon SE 5 - 15 SE 5 - 15 SE 20 - 30 --- None - None S 10 - 20
Friday Night - Saturday Morning S 10 - 20 S 15 - 25 S 20 - 30 --- None - None S 15 - 25
Saturday Afternoon SW 25 - 35 SW 15 - 25 SW 20 - 30 --- None - None SW 25 - 35
Mt. Baker Direction - Speed
Friday Afternoon SE 5 - 15
Friday Night - Saturday Morning S 10 - 20
Saturday Afternoon SW 25 - 35
Saturday Night SW 5 - 15
Washington Pass Direction - Speed
Friday Afternoon SE 5 - 15
Friday Night - Saturday Morning S 15 - 25
Saturday Afternoon SW 15 - 25
Saturday Night WSW 5 - 15
Stevens and Snoqualmie Pass Direction - Speed
Friday Afternoon SE 20 - 30
Friday Night - Saturday Morning S 20 - 30
Saturday Afternoon SW 20 - 30
Saturday Night WSW 10 - 20
Mt. Rainier Direction - Speed
Friday Afternoon --- None - None
Friday Night - Saturday Morning --- None - None
Saturday Afternoon --- None - None
Saturday Night --- None - None
Mt. Hood Direction - Speed
Friday Afternoon S 10 - 20
Friday Night - Saturday Morning S 15 - 25
Saturday Afternoon SW 25 - 35
Saturday Night SW 15 - 25

Extended Weather Synopsis for Sunday night through Tuesday

The trailing upper level trough will open up and position itself off of Vancouver Island Sunday. An upper level shortwave rotating from the upper low should help increase shower activity and cloudiness on Sunday afternoon, especially along the west slopes of Cascades, Olympics and Mt. Hood. From there a winter-like westerly jet aimed into southern Oregon/northern California will direct a series of weather systems into the area through much of next week. The heaviest precipitation looks to be centered on the southern Washington Cascades and Mt. Hood through Tuesday, but there will be periods of moderate precipitation for all areas as the quasi-stationary upper low off of Vancouver Island ejects inland. Summing up the whole work week, it looks like a good week for accumulating snowfall in the alpine and a poor week for sunglasses. 

Extended Weather

Olympics, Washington Cascades and Mt. Hood
Sunday - Sunday Evening

Mostly cloudy with scattered light rain and snow showers in the morning. Becoming cloudy with light to occasionally moderate rain and snow showers in the afternoon.

Sunday Night

Mostly cloudy with scattered light rain and snow showers. 

Monday

Light to moderate rain and snow over the Olympics spreading inland to Mt. Hood, and the south and central Washington Cascades. Light rain and snow north Cascades. 

Extended Snow/Freezing Levels

Mt. Baker Snoqualmie Pass Mt. Hood Easterly Flow *
Sunday Snow Level 4500' - 5500' 4500' - 5500' 4500' - 5500'
Sunday Night Snow Level 3500' - 4500' 3500' - 4500' 3500' - 4500'
Monday Snow Level 4500' - 5500' 4500' - 5500' 4500' - 5500'
Monday Night Snow Level 4000' - 5000' 4000' - 5000' 4000' - 5000'
Mt. Baker Elevation
Sunday Snow Level
4500' - 5500'
Sunday Night Snow Level
3500' - 4500'
Monday Snow Level
4500' - 5500'
Monday Night Snow Level
4000' - 5000'
Tuesday Snow Level
5000' - 6000'
Snoqualmie Pass Elevation
Sunday Snow Level
4500' - 5500'
Sunday Night Snow Level
3500' - 4500'
Monday Snow Level
4500' - 5500'
Monday Night Snow Level
4000' - 5000'
Tuesday Snow Level
5000' - 6000'
Mt. Hood Elevation
Sunday Snow Level
4500' - 5500'
Sunday Night Snow Level
3500' - 4500'
Monday Snow Level
4500' - 5500'
Monday Night Snow Level
4000' - 5000'
Tuesday Snow Level
5000' - 6000'

* 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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