Issued: 2:47 PM PDT Thursday, April 28, 2022
by Robert Hahn

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

Weather Synopsis

The Pacific Northwest gradually transitions into a more progressive weather pattern. The trough that has been with us most of the workweek transits across the area Thursday afternoon. Scattered rain/snow showers pepper areas south of I-90, but are more isolated and weaker further north. Westerly winds pick up across the southern Cascades as the trough exits Thursday evening enabling showers to continue across the west slopes of the Cascades, with most activity tapering by the overnight hours. Snow levels sit around 3500-4000 ft.

A short-lived ridge moves into our region on Friday with partly cloudy skies, milder temperatures, and light generally W winds. Freezing levels rise to 4500-5500 ft with the warmest temperatures on the E slopes of the Cascades.

A closed upper low approaches the Washington coastline Friday night, but the initial precipitation will reach the coastline and western Olympics late Thursday afternoon. Southerly winds aloft ahead of the low should spread light to moderate rain and snow throughout the Olympics and Cascades south of I-90 during the evening hours, and then into the northern Washington Cascades overnight. Light E low-level winds will enable the E slopes of the Casades to pick up comparable amounts of precipitation. Snow levels start elevated and gradually lower as the low moves onshore over southern Washington early Saturday. Through Saturday, we expect 4-8" of high-density snow for Paradise and Mt. Hood with 3-6" likely for Crystal, the higher terrain in the central Washington Cascades, and eastern Olympics. Most other areas above the rain/snow line can expect 1-3" of snow.

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
Thursday Night Tapering light rain/snow showers in the evening, then partly to mostly clear skies overnight.
Friday Partly cloudy in the morning, then becoming mostly cloudy in the afternoon.
Thursday Night Tapering light rain/snow showers in the evening, then remaining mostly cloudy overnight.
Friday Partly cloudy in the morning, then becoming mostly cloudy in the afternoon.
Thursday Night Tapering light rain/snow showers in the evening, then remaining mostly cloudy overnight.
Friday Partly cloudy.
Thursday Night Tapering light rain/snow showers in the evening, then remaining mostly cloudy overnight.
Friday Partly cloudy with clouds cover increasing late in the day.
Thursday Night Tapering light rain/snow showers in the evening, then remaining mostly cloudy overnight.
Friday Partly cloudy.
Thursday Night Tapering light rain/snow showers in the evening, then remaining mostly cloudy overnight.
Friday Partly cloudy.
Thursday Night Mostly cloudy.
Friday Partly cloudy.
Thursday Night Mostly cloudy early with a slight chance of rain/snow showers near the Cascade Crest, then partial clearing overnight.
Friday Partly cloudy.
Thursday Night Mostly cloudy early with a slight chance of rain/snow showers near the Cascade Crest, then partial clearing overnight.
Friday Partly cloudy.
Thursday Night Light rain/snow showers decreasing after midnight. Strong ridgeline wind gusts possible.
Friday Isolated rain/snow showers early in the day, then becoming partly cloudy with clouds increasing late.

Precipitation (in)

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

Snow Level (ft)

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

5000' Temperatures (°F)

Thursday Night Friday
Max / Min Max / Min
Olympics 29 / 25 36 / 25
West North 31 / 25 36 / 25
West Central 32 / 26 37 / 26
West South 33 / 26 38 / 27
Stevens Pass 34 / 26 40 / 27
Snoqualmie Pass 32 / 27 37 / 26
East North 35 / 26 40 / 26
East Central 34 / 27 39 / 27
East South 35 / 27 39 / 27
Mt. Hood 32 / 28 40 / 28
Olympics 5000' Temperature Forecast
(Max / Min)
Thursday Night 29 / 25
Friday 36 / 25
West North 5000' Temperature Forecast
(Max / Min)
Thursday Night 31 / 25
Friday 36 / 25
West Central 5000' Temperature Forecast
(Max / Min)
Thursday Night 32 / 26
Friday 37 / 26
West South 5000' Temperature Forecast
(Max / Min)
Thursday Night 33 / 26
Friday 38 / 27
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Thursday Night 34 / 26
Friday 40 / 27
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Thursday Night 32 / 27
Friday 37 / 26
East North 5000' Temperature Forecast
(Max / Min)
Thursday Night 35 / 26
Friday 40 / 26
East Central 5000' Temperature Forecast
(Max / Min)
Thursday Night 34 / 27
Friday 39 / 27
East South 5000' Temperature Forecast
(Max / Min)
Thursday Night 35 / 27
Friday 39 / 27
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Thursday Night 32 / 28
Friday 40 / 28

Ridgeline Winds (mph)

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

Extended Weather Synopsis

The upper low weakens and exits the region Saturday evening with lingering showers dissipating. Another transitory ridge moves into the area through Sunday, bringing fair weather to the region. Freezing levels rise late Sunday to around 7000 ft. A sharp trough approaches Sunday night and moves onshore Monday with another round of light to moderate rain and snow for the Cascades with snow levels dropping from around 4500-5000 ft to 3000-4000 ft.

Extended Snow Level (ft)

Saturday Night Sunday Sunday Night Monday
West North 5000' 6000' 7000' 4000'
Snoqualmie Pass 4500' 6500' 7000' 4000'
Mt. Hood 4500' 6500' 7500' 3500'
West North Elevation
Saturday Night 5000'
Sunday 6000'
Sunday Night 7000'
Monday 4000'
Snoqualmie Pass Elevation
Saturday Night 4500'
Sunday 6500'
Sunday Night 7000'
Monday 4000'
Mt. Hood Elevation
Saturday Night 4500'
Sunday 6500'
Sunday Night 7500'
Monday 3500'

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

Previous forecast from Apr 27, 2022

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