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Mountain Weather Forecast

Issued: 2:30 PM PST Friday, March 22, 2019
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 night through Sunday

A negatively tilted frontal band extending from a low pressure in the Gulf of Alaska continues to slowly approach the Cascades this afternoon. Precipitation has reached the Olympics and Mt. Hood at 2 pm. 

The front will weaken as it passes through the Cascades this evening with pretty unimpressive precipitation totals expected overnight. Showers should diminish quickly after midnight. The one exception will the Mt. Baker area where a modest half inch of water or so is expected overnight in post-frontal showers. Generally light snowfall accumulations are expected above 4000-4500 ft. The front will usher in much cooler air and we should see widespread temperatures below freezing for the first time in over a week. 

Weak longwave troughing will remain over the area Saturday along with onshore (westerly flow) at the surface. This should translate to slowly building cumulus in the afternoon with a chance of showers mainly for the Cascade Passes, west slopes and Olympics and a bit more sun for the east slopes of the Cascades. 

The longwave trough passes inland on Sunday. This should again allow for an afternoon increase in cloud cover with daytime heating with the best chance for showers closer to the trough over the Washington Pass area. Freezing levels will rebound somewhat on Sunday. 

Weather Forecast

Hurricane Ridge
Friday Night Cloudy with light rain and snow showers in the evening decreasing after midnight. Cooling trend.
Partly sunny in the morning becoming mostly cloudy in the afternoon. Chance of afternoon light rain and snow showers.
Mt. Baker
Friday Night Cloudy with light to moderate rain and snow showers in the evening decreasing after midnight. Winds also decreasing overnight. Cooling trend.
Mostly cloudy with light scattered rain and snow showers mainly in the afternoon.
Washington Pass and Leavenworth
Friday Night Cloudy with scattered light rain and snow showers in the evening, becoming mostly cloudy after midnight.
Partly sunny in the morning becoming mostly cloudy in the afternoon. Slight chance of afternoon mountain showers.
Stevens and Snoqualmie Pass
Friday Night Cloudy with light rain and snow showers in the evening, becoming mostly cloudy with scattered showers after midnight. Light to moderate west wind in the Passes.
Partly sunny in the morning becoming mostly cloudy in the afternoon. Chance of afternoon showers. Light west wind in the Passes.
Mt. Rainier, Crystal and White Pass
Friday Night Cloudy with light rain and snow showers in the evening, becoming mostly cloudy with scattered showers after midnight.
Partly sunny in the morning becoming mostly cloudy in the afternoon. Chance of afternoon showers.
Mt. Hood
Friday Night Cloudy with light rain and snow showers in the evening, becoming mostly cloudy with scattered showers after midnight.
Mostly cloudy with light scattered rain and snow showers.

Snow/Freezing Level (ft)

Hurricane Ridge Mt. Baker Washington Pass Leavenworth Stevens Pass Snoqualmie Pass Mt. Rainier, Crystal & White Pass Mt. Hood
Friday Evening Snow Level 4000' 5000' 6000' 6000' 5000' 5000' 4500' 4500'
Friday Night Snow Level 4000' 4000' 4000' 4000' 4000' 4000' 4000' 4000'
Saturday Morning Snow Level 3500' 3500' 3500' 3500' 3500' 3500' 3500' 3500'
Saturday Afternoon Snow Level 4000' 4500' 5000' 5000' 4500' 4500' 4500' 4500'
Saturday Evening Snow Level 4000' 4000' 4000' 4000' 4000' 4000' 4000' 4000'
Saturday Night Snow Level 3500' 3500' 3500' 3500' 3500' 3500' 3500' 3500'
Sunday Morning Freezing Level 4500' 4500' 4500' 4500' 4500' 4500' 4500' 4500'
Hurricane Ridge Elevation
Friday Evening Snow Level
4000'
Friday Night Snow Level
4000'
Saturday Morning Snow Level
3500'
Saturday Afternoon Snow Level
4000'
Saturday Evening Snow Level
4000'
Saturday Night Snow Level
3500'
Sunday Morning Freezing Level
4500'
Sunday Afternoon Freezing Level
5000'
Mt. Baker Elevation
Friday Evening Snow Level
5000'
Friday Night Snow Level
4000'
Saturday Morning Snow Level
3500'
Saturday Afternoon Snow Level
4500'
Saturday Evening Snow Level
4000'
Saturday Night Snow Level
3500'
Sunday Morning Freezing Level
4500'
Sunday Afternoon Freezing Level
5500'
Washington Pass Elevation
Friday Evening Snow Level
6000'
Friday Night Snow Level
4000'
Saturday Morning Snow Level
3500'
Saturday Afternoon Snow Level
5000'
Saturday Evening Snow Level
4000'
Saturday Night Snow Level
3500'
Sunday Morning Freezing Level
4500'
Sunday Afternoon Freezing Level
6000'
Leavenworth Elevation
Friday Evening Snow Level
6000'
Friday Night Snow Level
4000'
Saturday Morning Snow Level
3500'
Saturday Afternoon Snow Level
5000'
Saturday Evening Snow Level
4000'
Saturday Night Snow Level
3500'
Sunday Morning Freezing Level
4500'
Sunday Afternoon Freezing Level
6000'
Stevens Pass Elevation
Friday Evening Snow Level
5000'
Friday Night Snow Level
4000'
Saturday Morning Snow Level
3500'
Saturday Afternoon Snow Level
4500'
Saturday Evening Snow Level
4000'
Saturday Night Snow Level
3500'
Sunday Morning Freezing Level
4500'
Sunday Afternoon Freezing Level
6000'
Snoqualmie Pass Elevation
Friday Evening Snow Level
5000'
Friday Night Snow Level
4000'
Saturday Morning Snow Level
3500'
Saturday Afternoon Snow Level
4500'
Saturday Evening Snow Level
4000'
Saturday Night Snow Level
3500'
Sunday Morning Freezing Level
4500'
Sunday Afternoon Freezing Level
6000'
Mt. Rainier & Crystal Elevation
Friday Evening Snow Level
4500'
Friday Night Snow Level
4000'
Saturday Morning Snow Level
3500'
Saturday Afternoon Snow Level
4500'
Saturday Evening Snow Level
4000'
Saturday Night Snow Level
3500'
Sunday Morning Freezing Level
4500'
Sunday Afternoon Freezing Level
6500'
Mt. Hood Elevation
Friday Evening Snow Level
4500'
Friday Night Snow Level
4000'
Saturday Morning Snow Level
3500'
Saturday Afternoon Snow Level
4500'
Saturday Evening Snow Level
4000'
Saturday Night Snow Level
3500'
Sunday Morning Freezing Level
4500'
Sunday Afternoon Freezing Level
6500'

* 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 Night Saturday Saturday Night Sunday
5 pm - 5 am 5 am - 5 pm 5 pm - 5 am 5 am - 5 pm
Hurricane Ridge LT 0.10 LT 0.10 LT 0.10 0
Mt Baker Ski Area 0.50 LT 0.10 LT 0.10 0
Washington Pass LT 0.10 0 LT 0.10 LT 0.10
Leavenworth LT 0.10 0 0 0
Stevens Pass LT 0.10 LT 0.10 LT 0.10 0
Snoqualmie Pass LT 0.25 LT 0.10 LT 0.10 0
Mission Ridge LT 0.10 0 0 0
Crystal Mt LT 0.10 LT 0.10 LT 0.10 0
Paradise 0.25 LT 0.10 LT 0.10 0
White Pass LT 0.10 LT 0.10 LT 0.10 0
Mt Hood Meadows LT 0.10 LT 0.10 LT 0.10 0
LT 0.25 LT 0.10 LT 0.10 0
Hurricane Ridge Precipitation Forecast
Friday Night LT 0.10
Saturday LT 0.10
Saturday Night LT 0.10
Sunday 0
Mt Baker Ski Area Precipitation Forecast
Friday Night 0.50
Saturday LT 0.10
Saturday Night LT 0.10
Sunday 0
Washington Pass Precipitation Forecast
Friday Night LT 0.10
Saturday 0
Saturday Night LT 0.10
Sunday LT 0.10
Leavenworth Precipitation Forecast
Friday Night LT 0.10
Saturday 0
Saturday Night 0
Sunday 0
Stevens Pass Precipitation Forecast
Friday Night LT 0.10
Saturday LT 0.10
Saturday Night LT 0.10
Sunday 0
Snoqualmie Pass Precipitation Forecast
Friday Night LT 0.25
Saturday LT 0.10
Saturday Night LT 0.10
Sunday 0
Mission Ridge Precipitation Forecast
Friday Night LT 0.10
Saturday 0
Saturday Night 0
Sunday 0
Crystal Mt Precipitation Forecast
Friday Night LT 0.10
Saturday LT 0.10
Saturday Night LT 0.10
Sunday 0
Paradise Precipitation Forecast
Friday Night 0.25
Saturday LT 0.10
Saturday Night LT 0.10
Sunday 0
White Pass Precipitation Forecast
Friday Night LT 0.10
Saturday LT 0.10
Saturday Night LT 0.10
Sunday 0
Mt Hood Meadows Precipitation Forecast
Friday Night LT 0.10
Saturday LT 0.10
Saturday Night LT 0.10
Sunday 0
Timberline Precipitation Forecast
Friday Night LT 0.25
Saturday LT 0.10
Saturday Night LT 0.10
Sunday 0

Free Winds at 5000' (mph)

Hurricane Ridge Mt. Baker Stevens to Snoqualmie Pass Mt. Rainier Mt. Hood
Friday Evening SW 10 - 20 SSW 15 - 30 WSW 15 - 25 SW 10 - 20 SW 10 - 20
Friday Night SW 5 - 15 SW 5 - 15 WSW 5 - 15 SW 5 - 15 SW 10 - 20
Saturday Morning S 0 - 10 S 0 - 10 SW 0 - 10 SW 0 - 10 SW 5 - 15
Hurricane Ridge Elevation
Friday Evening SW 10 - 20
Friday Night SW 5 - 15
Saturday Morning S 0 - 10
Saturday Afternoon S 0 - 10
Mt. Baker Elevation
Friday Evening SSW 15 - 30
Friday Night SW 5 - 15
Saturday Morning S 0 - 10
Saturday Afternoon SW 0 - 10
Stevens and Snoqualmie Pass Elevation
Friday Evening WSW 15 - 25
Friday Night WSW 5 - 15
Saturday Morning SW 0 - 10
Saturday Afternoon SW 0 - 10
Mt. Rainier Elevation
Friday Evening SW 10 - 20
Friday Night SW 5 - 15
Saturday Morning SW 0 - 10
Saturday Afternoon SW 0 - 10
Mt. Hood Elevation
Friday Evening SW 10 - 20
Friday Night SW 10 - 20
Saturday Morning SW 5 - 15
Saturday Afternoon W 5 - 15
Hurricane Ridge Direction - Speed
Friday Evening SW 10 - 20
Friday Night SW 5 - 15
Saturday Morning S 0 - 10
Saturday Afternoon S 0 - 10
Mt. Baker Direction - Speed
Friday Evening SSW 15 - 30
Friday Night SW 5 - 15
Saturday Morning S 0 - 10
Saturday Afternoon SW 0 - 10
Stevens and Snoqualmie Pass Direction - Speed
Friday Evening WSW 15 - 25
Friday Night WSW 5 - 15
Saturday Morning SW 0 - 10
Saturday Afternoon SW 0 - 10
Mt. Rainier Direction - Speed
Friday Evening SW 10 - 20
Friday Night SW 5 - 15
Saturday Morning SW 0 - 10
Saturday Afternoon SW 0 - 10
Mt. Hood Direction - Speed
Friday Evening SW 10 - 20
Friday Night SW 10 - 20
Saturday Morning SW 5 - 15
Saturday Afternoon W 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
Friday Evening SSW 20 - 30 SW 5 - 15 SW 10 - 20 SW 10 - 20 SW 20 - 30
Friday Night SW 10 - 20 SW 5 - 15 SW 15 - 25 SW 15 - 25 SW 15 - 25
Saturday Morning SW 0 - 10 S 0 - 10 SW 5 - 15 SW 5 - 15 SW 10 - 20
Mt. Baker Direction - Speed
Friday Evening SSW 20 - 30
Friday Night SW 10 - 20
Saturday Morning SW 0 - 10
Saturday Afternoon S 0 - 10
Washington Pass Direction - Speed
Friday Evening SW 5 - 15
Friday Night SW 5 - 15
Saturday Morning S 0 - 10
Saturday Afternoon S 0 - 10
Stevens and Snoqualmie Pass Direction - Speed
Friday Evening SW 10 - 20
Friday Night SW 15 - 25
Saturday Morning SW 5 - 15
Saturday Afternoon SW 0 - 10
Mt. Rainier Direction - Speed
Friday Evening SW 10 - 20
Friday Night SW 15 - 25
Saturday Morning SW 5 - 15
Saturday Afternoon SW 0 - 10
Mt. Hood Direction - Speed
Friday Evening SW 20 - 30
Friday Night SW 15 - 25
Saturday Morning SW 10 - 20
Saturday Afternoon SW 5 - 15

Extended Weather Synopsis for Sunday night through Tuesday

After a dry Sunday night, a stacked and closed upper low well offshore will rotate a frontal band up from the south spreading light to moderate precipitation over the area Monday afternoon. The European model has consistently shown slower timing, with the bulk of the precipitation not arriving until late afternoon or evening.  Leftover showers will diminish Monday night. Weak upper level troughing over the area on Tuesday will allow for scattered showers and a fair bit of cloud cover. 

Extended Snow/Freezing Levels

Mt. Baker Snoqualmie Pass Mt. Hood Easterly Flow *
Sunday Night Freezing Level 4000' - 5000' 4000' - 5000' 5500' - 6500'
Monday Snow Level 4000' - 5000' 4000' - 5000' 3500' - 4500'
Monday Night Snow Level 2500' - 3500' 2500' - 3500' 2500' - 3500'
Mt. Baker Elevation
Sunday Night Freezing Level
4000' - 5000'
Monday Snow Level
4000' - 5000'
Monday Night Snow Level
2500' - 3500'
Tuesday Snow Level
3000' - 4000'
Snoqualmie Pass Elevation
Sunday Night Freezing Level
4000' - 5000'
Monday Snow Level
4000' - 5000'
Monday Night Snow Level
2500' - 3500'
Tuesday Snow Level
3500' - 4500'
Mt. Hood Elevation
Sunday Night Freezing Level
5500' - 6500'
Monday Snow Level
3500' - 4500'
Monday Night Snow Level
2500' - 3500'
Tuesday Snow Level
4000' - 5000'

* 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

Previous forecast from March 22, 2019

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