Issued: 2:42 PM PDT Friday, April 21, 2023
by Robert Hahn

Jump to: Weather Forecast I Precipitation I Snow Level I 5000' Temps I Ridgeline Winds I Extended Weather

Weather Synopsis

Friday may be the last hurrah for the sustained cold and snowy April pattern that has amplified snow depths to 100-120% of seasonal averages at most NWAC stations. Post-frontal very light rain/snow showers linger into the evening hours on Friday along the west slopes of the Cascades. Mostly cloudy skies remain overnight with a warm front just offshore spreading light showers into the Olympics and Mt Hood areas during the early morning hours and initiating a warming trend. The front lifts from SW to NE across the region on Saturday, bringing light rain and snow primarily near and west of the Cascade Crest. Models can't make up their minds whether shower activity will occurs south of I-90 during the daylight hours, but most indicate shower activity in the northern Cascades. Snow levels rise above ski area bases by 8 AM for Mt Hood and Snoqualmie Passes, by 10 AM for Stevens Pass, and by 2 PM for Mt Baker.

Saturday night, southerly winds continue to transport milder air into the region ahead of an associated cold front. Light rain and high-elevation snow gradually increase, peaking early Sunday morning with the frontal passage. The moderate SSW flow favors Mt Baker where we expect 1-1.5" of water equivalent Saturday night through Sunday. Most other areas can expect 0.1-0.5" of water equivalent, with less than 0.1" east of the Cascade Crest. Snow levels peak around 6000-7000 ft Saturday night before dropping to 5000-6000 ft Sunday afternoon with SW flow ahead of an incoming trough brings light postfrontal showers.

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
Friday Night Isolated rain and snow showers increasing in the early morning hours.
Saturday Isolated light rain and snow showers. Strong warming trend.
Friday Night Scattered rain and snow showers tapering during the evening hours with mostly cloudy skies overnight.
Saturday Increasing isolated light rain and snow showers. Strong warming trend with snow levels rising above ski area base between 11 AM and 2 PM.
Friday Night Scattered rain and snow showers tapering during the evening hours with mostly cloudy skies overnight.
Saturday Increasing scattered light rain and snow showers. Strong warming trend.
Friday Night Scattered rain and snow showers tapering during the early evening hours with mostly cloudy skies overnight.
Saturday Scattered light rain or higher elevation snow showers. Strong warming trend.
Friday Night Scattered rain and snow showers tapering during the evening hours with partly cloudy skies overnight.
Saturday Scattered light rain or higher elevation snow showers. Strong warming trend with snow levels rising above pass level by 10 AM.
Friday Night Scattered rain and snow showers tapering during the evening hours with mostly cloudy skies overnight.
Saturday Scattered light rain or higher elevation snow showers. Strong warming trend with snow levels rising above pass level by 8 AM.
Friday Night Mostly cloudy skies near the Cascade Crest with partly cloudy skies further east.
Saturday Mostly cloudy with isolated snow showers near the Cascade Crest.
Friday Night Mostly cloudy skies near the Cascade Crest with partly cloudy skies further east.
Saturday Mostly cloudy with isolated snow showers near the Cascade Crest.
Friday Night Mostly cloudy skies near the Cascade Crest with partly cloudy skies further east.
Saturday Mostly cloudy with isolated snow showers near the Cascade Crest.
Friday Night Scattered light rain or snow showers.
Saturday Mostly cloudy with a chance of light rain or higher elevation snow showers. Strong warming trend.

Precipitation (in)

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

Snow Level (ft)

Friday Evening Friday Night Saturday Morning Saturday Afternoon Saturday Evening Saturday Night Sunday Morning Sunday Afternoon
Olympics 3500' 4000' 5500' 6000' 6500' 6000' 5500' 4000'
West North 3500' 3000' 3000' 4500' 5500' 5500' 5000' 5000'
West Central 3500' 3500' 3500' 5000' 6000' 6000' 5500' 5000'
West South 3500' 3500' 4500' 6000' 6500' 6500' 6000' 5500'
Stevens Pass 3500' 3500' 3000' 5000' 6000' 6000' 5500' 5000'
Snoqualmie Pass 3500' 4000' 4000' 5500' 6500' 6000' 5500' 5000'
East North 4500' 3500' 3500' 5500' 5500' 5000' 4500' 5000'
East Central 4500' 4000' 4000' 6000' 6500' 5500' 5500' 5500'
East South 4500' 4000' 5000' 6500' 7500' 6000' 6000' 6000'
Mt. Hood 4500' 5500' 6000' 6500' 7500' 7000' 6500' 6000'
Olympics Elevation
Friday Evening 3500'
Friday Night 4000'
Saturday Morning 5500'
Saturday Afternoon 6000'
Saturday Evening 6500'
Saturday Night 6000'
Sunday Morning 5500'
Sunday Afternoon 4000'
West North Elevation
Friday Evening 3500'
Friday Night 3000'
Saturday Morning 3000'
Saturday Afternoon 4500'
Saturday Evening 5500'
Saturday Night 5500'
Sunday Morning 5000'
Sunday Afternoon 5000'
West Central Elevation
Friday Evening 3500'
Friday Night 3500'
Saturday Morning 3500'
Saturday Afternoon 5000'
Saturday Evening 6000'
Saturday Night 6000'
Sunday Morning 5500'
Sunday Afternoon 5000'
West South Elevation
Friday Evening 3500'
Friday Night 3500'
Saturday Morning 4500'
Saturday Afternoon 6000'
Saturday Evening 6500'
Saturday Night 6500'
Sunday Morning 6000'
Sunday Afternoon 5500'
Stevens Pass Elevation
Friday Evening 3500'
Friday Night 3500'
Saturday Morning 3000'
Saturday Afternoon 5000'
Saturday Evening 6000'
Saturday Night 6000'
Sunday Morning 5500'
Sunday Afternoon 5000'
Snoqualmie Pass Elevation
Friday Evening 3500'
Friday Night 4000'
Saturday Morning 4000'
Saturday Afternoon 5500'
Saturday Evening 6500'
Saturday Night 6000'
Sunday Morning 5500'
Sunday Afternoon 5000'
East North Elevation
Friday Evening 4500'
Friday Night 3500'
Saturday Morning 3500'
Saturday Afternoon 5500'
Saturday Evening 5500'
Saturday Night 5000'
Sunday Morning 4500'
Sunday Afternoon 5000'
East Central Elevation
Friday Evening 4500'
Friday Night 4000'
Saturday Morning 4000'
Saturday Afternoon 6000'
Saturday Evening 6500'
Saturday Night 5500'
Sunday Morning 5500'
Sunday Afternoon 5500'
East South Elevation
Friday Evening 4500'
Friday Night 4000'
Saturday Morning 5000'
Saturday Afternoon 6500'
Saturday Evening 7500'
Saturday Night 6000'
Sunday Morning 6000'
Sunday Afternoon 6000'
Mt. Hood Elevation
Friday Evening 4500'
Friday Night 5500'
Saturday Morning 6000'
Saturday Afternoon 6500'
Saturday Evening 7500'
Saturday Night 7000'
Sunday Morning 6500'
Sunday Afternoon 6000'

5000' Temperatures (°F)

Friday Night Saturday
Max / Min Max / Min
Olympics 36 / 31 41 / 35
West North 31 / 29 38 / 31
West Central 31 / 29 39 / 31
West South 33 / 30 42 / 33
Stevens Pass 32 / 28 40 / 32
Snoqualmie Pass 32 / 28 40 / 32
East North 30 / 24 37 / 25
East Central 32 / 28 40 / 30
East South 32 / 28 44 / 31
Mt. Hood 36 / 32 44 / 36
Olympics 5000' Temperature Forecast
(Max / Min)
Friday Night 36 / 31
Saturday 41 / 35
West North 5000' Temperature Forecast
(Max / Min)
Friday Night 31 / 29
Saturday 38 / 31
West Central 5000' Temperature Forecast
(Max / Min)
Friday Night 31 / 29
Saturday 39 / 31
West South 5000' Temperature Forecast
(Max / Min)
Friday Night 33 / 30
Saturday 42 / 33
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Friday Night 32 / 28
Saturday 40 / 32
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Friday Night 32 / 28
Saturday 40 / 32
East North 5000' Temperature Forecast
(Max / Min)
Friday Night 30 / 24
Saturday 37 / 25
East Central 5000' Temperature Forecast
(Max / Min)
Friday Night 32 / 28
Saturday 40 / 30
East South 5000' Temperature Forecast
(Max / Min)
Friday Night 32 / 28
Saturday 44 / 31
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Friday Night 36 / 32
Saturday 44 / 36

Ridgeline Winds (mph)

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

Extended Weather Synopsis

Light rain and higher elevation snow showers continue with SW flow as the upper trough moves onshore Sunday evening. Shower activity decreases overnight and Monday as upper-level flow shifts NNWerly in the wake of the trough. Snow levels lower briefly to around 3000 ft early Monday, rising to 3500 ft with heating. Expect dry conditions east of the Cascade Crest. A ridge of high pressure gradually amplifies across the region, bringing dry weather, clearing skies, and gradually warming temperatures Monday night into Tuesday/

Extended Snow Level (ft)

Sunday Night Monday Monday Night Tuesday
West North 4000' 3500' 4000' 4000'
Snoqualmie Pass 4000' 3500' 4500' 4500'
Mt. Hood 4000' 3500' 4500' 5500'
West North Elevation
Sunday Night 4000'
Monday 3500'
Monday Night 4000'
Tuesday 4000'
Snoqualmie Pass Elevation
Sunday Night 4000'
Monday 3500'
Monday Night 4500'
Tuesday 4500'
Mt. Hood Elevation
Sunday Night 4000'
Monday 3500'
Monday Night 4500'
Tuesday 5500'

Jump to: Weather Forecast I Precipitation I Snow Level I 5000' Temps I Ridgeline Winds I Extended Weather

Previous forecast from Apr 19, 2023

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