Issued: 2:28 PM PDT Tuesday, April 6, 2021
by Dennis D'Amico

Jump to: Weather Forecast I Snow Level I Precipitation I Ridgeline Winds I Extended Weather

Weather Synopsis

After a beautiful and mild spring day, winter-like weather is set to return on Wednesday through Thursday. A frontal system dropping down from central British Columbia will reach our coast by early tomorrow morning, with high clouds increasing over the region overnight. Precipitation will spread over the Olympics and northwest Cascades in the morning, and then into the south Washington Cascades by later afternoon. Snow levels will drop quickly with the onset of precipitation into the 3000-4000' range. Look for ridgeline winds to increase during the day as well.

The front should pass through the central Cascades just after midnight, with a burst of moderate precipitation and strong westerly winds for most areas in the evening. Behind the front, a Puget Sound Convergence zone will form, focusing on the Mtn Loop and Hwy 2 corridor late Wednesday night, and then shifting south towards Snoqualmie by Thursday morning. This frontal system should produce 4-12 inches of snow across the west slopes of the Cascades and Mt Hood through Thursday morning. Cool and cloudy conditions will continue on Thursday with showers becoming light and scattered in the afternoon.  

Weather Forecast

Olympics
West North
West Central
West South
Stevens Pass
Snoqualmie Pass
East North
East Central
East South
Mt. Hood
Use dropdown to select your zone
Tuesday Night Partly cloudy, then becoming cloudy late.
Wednesday Cloudy with light rain and snow developing in the morning becoming light to occasionally moderate in the afternoon. Increasing ridgeline winds.
Tuesday Night Partly cloudy, then becoming cloudy late.
Wednesday Cloudy with light rain and snow developing in the morning becoming light to moderate in the afternoon. Increasing ridgeline winds.
Tuesday Night Mostly clear, then becoming mostly cloudy late.
Wednesday Cloudy in the morning with light to occasionally rain and snow developing mid-day. Increasing ridgeline winds.
Tuesday Night Mostly clear, then becoming partly cloudy with increasing high clouds overnight.
Wednesday Cloudy in the morning with light rain and snow developing in the afternoon. Increasing ridgeline winds.
Tuesday Night Mostly clear, then becoming partly cloudy with increasing high clouds overnight.
Wednesday Cloudy in the morning with light rain and snow developing mid-day. Increasing ridgeline winds.
Tuesday Night Mostly clear, then becoming partly cloudy with increasing high clouds overnight.
Wednesday Cloudy in the morning with light rain and snow developing mid-day. Increasing ridgeline winds.
Tuesday Night Mostly clear, then becoming partly cloudy with increasing high clouds overnight.
Wednesday Mostly cloudy in the morning. Becoming cloudy with light rain and snow developing mid-day. Increasing ridgeline winds.
Tuesday Night Mostly clear, then becoming partly cloudy with increasing high clouds overnight.
Wednesday Mostly cloudy in the morning. Becoming cloudy with light rain and snow developing near the Cascade crest early afternoon. Increasing ridgeline winds.
Tuesday Night Mostly clear.
Wednesday Mostly clear in the morning, becoming cloudy in the afternoon. Chance of light rain and snow late. Increasing ridgeline winds.
Tuesday Night Mostly clear.
Wednesday Mostly clear in the morning, becoming cloudy in the afternoon. Chance of light rain and snow late. Increasing ridgeline winds.

Precipitation (in)

Tuesday Night Wednesday Wednesday Night Thursday
5 pm - 5 am 5 am - 5 pm 5 pm - 5 am 5 am - 5 pm
Hurricane Ridge 0 LT 0.25 0.25 0
Mt Baker Ski Area 0 0.50 0.50 - 0.75 LT 0.25
Mt. Loop - Barlow Pass 0 0.25 0.75 0.25
Stevens Pass 0 LT 0.25 0.50 LT 0.25
Snoqualmie Pass 0 LT 0.25 0.50 - 0.75 0.25
Crystal Mt 0 LT 0.10 0.25 LT 0.10
Paradise 0 LT 0.10 0.50 - 0.75 LT 0.25
White Pass 0 LT 0.10 0.25 - 0.50 LT 0.10
Washington Pass 0 LT 0.10 0.25 LT 0.10
Mission Ridge 0 0 LT 0.10 LT 0.10
Salmon la Sac - Gallagher Head 0 LT 0.10 0.25 - 0.50 LT 0.25
Tieton River - Darland Mt. 0 0 LT 0.25 LT 0.10
Mt Hood Meadows 0 0 0.25 LT 0.10
Timberline 0 0 0.25 - 0.50 LT 0.25
Hurricane Ridge Precipitation (in)
Tuesday Night 0
Wednesday LT 0.25
Wednesday Night 0.25
Thursday 0
Mt Baker Ski Area Precipitation (in)
Tuesday Night 0
Wednesday 0.50
Wednesday Night 0.50 - 0.75
Thursday LT 0.25
Mt. Loop - Barlow Pass Precipitation (in)
Tuesday Night 0
Wednesday 0.25
Wednesday Night 0.75
Thursday 0.25
Stevens Pass Precipitation (in)
Tuesday Night 0
Wednesday LT 0.25
Wednesday Night 0.50
Thursday LT 0.25
Snoqualmie Pass Precipitation (in)
Tuesday Night 0
Wednesday LT 0.25
Wednesday Night 0.50 - 0.75
Thursday 0.25
Crystal Mt Precipitation (in)
Tuesday Night 0
Wednesday LT 0.10
Wednesday Night 0.25
Thursday LT 0.10
Paradise Precipitation (in)
Tuesday Night 0
Wednesday LT 0.10
Wednesday Night 0.50 - 0.75
Thursday LT 0.25
White Pass Precipitation (in)
Tuesday Night 0
Wednesday LT 0.10
Wednesday Night 0.25 - 0.50
Thursday LT 0.10
Washington Pass Precipitation (in)
Tuesday Night 0
Wednesday LT 0.10
Wednesday Night 0.25
Thursday LT 0.10
Mission Ridge Precipitation (in)
Tuesday Night 0
Wednesday 0
Wednesday Night LT 0.10
Thursday LT 0.10
Salmon la Sac - Gallagher Head Precipitation (in)
Tuesday Night 0
Wednesday LT 0.10
Wednesday Night 0.25 - 0.50
Thursday LT 0.25
Tieton River - Darland Mt. Precipitation (in)
Tuesday Night 0
Wednesday 0
Wednesday Night LT 0.25
Thursday LT 0.10
Mt Hood Meadows Precipitation (in)
Tuesday Night 0
Wednesday 0
Wednesday Night 0.25
Thursday LT 0.10
Timberline Precipitation (in)
Tuesday Night 0
Wednesday 0
Wednesday Night 0.25 - 0.50
Thursday LT 0.25

Snow Level (ft)

Tuesday Evening Tuesday Night Wednesday Morning Wednesday Afternoon Wednesday Evening Wednesday Night Thursday Morning Thursday Afternoon
Olympics 7000' 4500' 3500' 3000' 2500' 2000' 2000' 3000'
West North 6000' 5000' 3500' 3000' 2500' 2000' 2000' 3000'
West Central 7000' 5000' 4000' 4000' 2500' 2500' 2000' 3000'
West South 7500' 6000' 5000' 4500' 3000' 2500' 2000' 3500'
Stevens Pass 7000' 5000' 4500' 3500' 3000' 2500' 2000' 3000'
Snoqualmie Pass 7000' 5000' 4500' 3500' 3000' 2500' 2000' 3000'
East North 7500' 6000' 5500' 5000' 3500' 2500' 2500' 4500'
East Central 7500' 7000' 5500' 5000' 3500' 2500' 2500' 4000'
East South 8000' 7000' 6000' 5000' 3500' 2500' 2500' 4500'
Mt. Hood 9000' 8000' 7000' 5500' 4000' 3000' 2500' 3500'
Olympics Elevation
Tuesday Evening 7000'
Tuesday Night 4500'
Wednesday Morning 3500'
Wednesday Afternoon 3000'
Wednesday Evening 2500'
Wednesday Night 2000'
Thursday Morning 2000'
Thursday Afternoon 3000'
West North Elevation
Tuesday Evening 6000'
Tuesday Night 5000'
Wednesday Morning 3500'
Wednesday Afternoon 3000'
Wednesday Evening 2500'
Wednesday Night 2000'
Thursday Morning 2000'
Thursday Afternoon 3000'
West Central Elevation
Tuesday Evening 7000'
Tuesday Night 5000'
Wednesday Morning 4000'
Wednesday Afternoon 4000'
Wednesday Evening 2500'
Wednesday Night 2500'
Thursday Morning 2000'
Thursday Afternoon 3000'
West South Elevation
Tuesday Evening 7500'
Tuesday Night 6000'
Wednesday Morning 5000'
Wednesday Afternoon 4500'
Wednesday Evening 3000'
Wednesday Night 2500'
Thursday Morning 2000'
Thursday Afternoon 3500'
Stevens Pass Elevation
Tuesday Evening 7000'
Tuesday Night 5000'
Wednesday Morning 4500'
Wednesday Afternoon 3500'
Wednesday Evening 3000'
Wednesday Night 2500'
Thursday Morning 2000'
Thursday Afternoon 3000'
Snoqualmie Pass Elevation
Tuesday Evening 7000'
Tuesday Night 5000'
Wednesday Morning 4500'
Wednesday Afternoon 3500'
Wednesday Evening 3000'
Wednesday Night 2500'
Thursday Morning 2000'
Thursday Afternoon 3000'
East North Elevation
Tuesday Evening 7500'
Tuesday Night 6000'
Wednesday Morning 5500'
Wednesday Afternoon 5000'
Wednesday Evening 3500'
Wednesday Night 2500'
Thursday Morning 2500'
Thursday Afternoon 4500'
East Central Elevation
Tuesday Evening 7500'
Tuesday Night 7000'
Wednesday Morning 5500'
Wednesday Afternoon 5000'
Wednesday Evening 3500'
Wednesday Night 2500'
Thursday Morning 2500'
Thursday Afternoon 4000'
East South Elevation
Tuesday Evening 8000'
Tuesday Night 7000'
Wednesday Morning 6000'
Wednesday Afternoon 5000'
Wednesday Evening 3500'
Wednesday Night 2500'
Thursday Morning 2500'
Thursday Afternoon 4500'
Mt. Hood Elevation
Tuesday Evening 9000'
Tuesday Night 8000'
Wednesday Morning 7000'
Wednesday Afternoon 5500'
Wednesday Evening 4000'
Wednesday Night 3000'
Thursday Morning 2500'
Thursday Afternoon 3500'

5000' Temperatures (°F)

Tuesday Night Wednesday
Max / Min Max / Min
Olympics 37 / 30 30 / 25
West North 35 / 30 30 / 26
West Central 36 / 30 31 / 26
West South 40 / 32 33 / 28
Stevens Pass 38 / 31 31 / 27
Snoqualmie Pass 36 / 31 31 / 25
East North 39 / 31 33 / 28
East Central 41 / 32 34 / 29
East South 43 / 32 35 / 31
Mt. Hood 44 / 34 38 / 31
Olympics 5000' Temperature Forecast
(Max / Min)
Tuesday 5pm - 5am 37 / 30
Wednesday 5am - 5pm 30 / 25
West North 5000' Temperature Forecast
(Max / Min)
Tuesday 5pm - 5am 35 / 30
Wednesday 5am - 5pm 30 / 26
West Central 5000' Temperature Forecast
(Max / Min)
Tuesday 5pm - 5am 36 / 30
Wednesday 5am - 5pm 31 / 26
West South 5000' Temperature Forecast
(Max / Min)
Tuesday 5pm - 5am 40 / 32
Wednesday 5am - 5pm 33 / 28
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Tuesday 5pm - 5am 38 / 31
Wednesday 5am - 5pm 31 / 27
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Tuesday 5pm - 5am 36 / 31
Wednesday 5am - 5pm 31 / 25
East North 5000' Temperature Forecast
(Max / Min)
Tuesday 5pm - 5am 39 / 31
Wednesday 5am - 5pm 33 / 28
East Central 5000' Temperature Forecast
(Max / Min)
Tuesday 5pm - 5am 41 / 32
Wednesday 5am - 5pm 34 / 29
East South 5000' Temperature Forecast
(Max / Min)
Tuesday 5pm - 5am 43 / 32
Wednesday 5am - 5pm 35 / 31
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Tuesday 5pm - 5am 44 / 34
Wednesday 5am - 5pm 38 / 31

Ridgeline Winds (mph)

Tuesday Evening Tuesday Night Wednesday Morning Wednesday Afternoon
Olympics SW 5-15 SW 10-20 SW 10-20 SW 20-30
West North SW 5-15 SSW 10-20 SSW 15-25 SSW 20-30
West Central SW 5-15 WSW 5-15 SW 15-25 SW 20-30
West South SW 0-10 SW 5-15 WSW 15-25 SW 20-30
Stevens Pass WSW 5-15 WSW 5-15 WSW 10-20 WSW 10-20
Snoqualmie Pass W 5-15 W 5-15 WSW 15-25 WSW 20-30
East North WSW 5-15 WSW 5-15 WSW 15-25 WSW 15-25
East Central WSW 5-15 W 10-20 WSW 20-30 WSW 20-30
East South WSW 5-15 W 5-15 W 15-25 WSW 15-25
Mt. Hood SW 5-15 WSW 10-20 W 15-25 WSW 20-30
Olympics Ridgeline Winds (mph)
Tuesday Evening SW 5-15
Tuesday Night SW 10-20
Wednesday Morning SW 10-20
Wednesday Afternoon SW 20-30
West North Ridgeline Winds (mph)
Tuesday Evening SW 5-15
Tuesday Night SSW 10-20
Wednesday Morning SSW 15-25
Wednesday Afternoon SSW 20-30
West Central Ridgeline Winds (mph)
Tuesday Evening SW 5-15
Tuesday Night WSW 5-15
Wednesday Morning SW 15-25
Wednesday Afternoon SW 20-30
West South Ridgeline Winds (mph)
Tuesday Evening SW 0-10
Tuesday Night SW 5-15
Wednesday Morning WSW 15-25
Wednesday Afternoon SW 20-30
Stevens Pass Ridgeline Winds (mph)
Tuesday Evening WSW 5-15
Tuesday Night WSW 5-15
Wednesday Morning WSW 10-20
Wednesday Afternoon WSW 10-20
Snoqualmie Pass Ridgeline Winds (mph)
Tuesday Evening W 5-15
Tuesday Night W 5-15
Wednesday Morning WSW 15-25
Wednesday Afternoon WSW 20-30
East North Ridgeline Winds (mph)
Tuesday Evening WSW 5-15
Tuesday Night WSW 5-15
Wednesday Morning WSW 15-25
Wednesday Afternoon WSW 15-25
East Central Ridgeline Winds (mph)
Tuesday Evening WSW 5-15
Tuesday Night W 10-20
Wednesday Morning WSW 20-30
Wednesday Afternoon WSW 20-30
East South Ridgeline Winds (mph)
Tuesday Evening WSW 5-15
Tuesday Night W 5-15
Wednesday Morning W 15-25
Wednesday Afternoon WSW 15-25
Mt. Hood Ridgeline Winds (mph)
Tuesday Evening SW 5-15
Tuesday Night WSW 10-20
Wednesday Morning W 15-25
Wednesday Afternoon WSW 20-30

Extended Weather Synopsis

We'll dry out Thursday night as an upper level ridge makes a brief appearance over the area. Another frontal system will approach from the NW on Friday. Light rain and snow should develop over the north Cascades and Olymipcs in the afternoon. The main precipitation event will hold off until Friday night with post-frontal showers continuing through Saturday. This system may kick things up a notch versus the Wednesday system; it has the potential to produce a bit more snow and wind for the first half of the weekend. 

Extended Snow Level (ft)

Thursday Night Friday Friday Night Saturday
West North 1500' 3500' 2500' 2500'
Snoqualmie Pass 1500' 4000' 2500' 2500'
Mt. Hood 2500' 4500' 3500' 3000'
West North Elevation
Thursday Night 1500'
Friday 3500'
Friday Night 2500'
Saturday 2500'
Snoqualmie Pass Elevation
Thursday Night 1500'
Friday 4000'
Friday Night 2500'
Saturday 2500'
Mt. Hood Elevation
Thursday Night 2500'
Friday 4500'
Friday Night 3500'
Saturday 3000'

Jump to: Weather Forecast I Snow Level I Precipitation I Ridgeline Winds I Extended Weather

Previous forecast from Apr 6, 2021

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.

The 5000’ temperature forecast does not imply a trend over the 12 hr period and only represents the max and min temperatures within a 12 hr period in the zone. The 6-hr snow level forecast, the forecast discussion, and weather forecast sections may add detail regarding temperature trends.

The snow level forecast represents the general snow level over a 6 hr time period. Freezing levels are forecast when precipitation is not expected.

*Easterly or offshore flow is highlighted with an asterisk when we expect relatively cool east winds in the major Cascade Passes. Easterly flow will often lead to temperature inversions and is a key variable for forecasting precipitation type in the Cascade Passes. Strong easterly flow events can affect terrain on a more regional scale.

Ridgeline winds are the average wind speed and direction over a 6 hr time period.

The wind forecast represents an elevation range instead of a single elevation slice. The elevation range overlaps with the near and above treeline elevation bands in the avalanche forecast and differs per zone.

Wind direction indicates the direction the wind originates or comes from on the 16-point compass rose.

Water Equivalent (WE) is the liquid water equivalent of all precipitation types; rain, snow, ice pellets, etc., forecast to the hundredth of an inch at specific locations. To use WE as a proxy for snowfall amounts, start with a snow to water ratio of 10:1 (10 inches of snow = 1 inch WE). Temperatures at or near freezing will generally have a lower ratio (heavy wet snow) and very cold temperatures can have a much higher ratio (dry fluffy snow).

The label LT, is shorthand for ‘less than’.

Updated Mountain Weather Zone Name Changes – December 2020