Issued: 2:46 PM PDT Friday, April 29, 2022
by Robert Hahn

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

Weather Synopsis

A progressive weather pattern will keep the region flip-flopping between wet/cool and dry/warm weather.

Mostly cloudy skies and a few rain/snow showers linger for the west slopes of the Cascades with moisture trapped under a weak ridge Friday afternoon. A well-developed approaching closed low tracking toward northern Oregon brings a period of moderate SSW ridgeline winds and a steady precipitation shield into the region. Expect moderate to heavy rain/snow for Mt. Rainier southward and the southern portions of the Olympics with light to moderate rain and snow reaching areas north of I-90 overnight. Light to moderate scattered showers decrease during the day, but may be locally intense Saturday afternoon as the low moves onshore. Snow levels should be slightly higher than in recent storms, lowering from 5500-6000 ft Friday evening to 4000-4500 ft on Saturday. Easterly low-level winds should combine with upper-level SE winds wrapping around the low to create upslope enhancement along the east slopes of the Cascades. Storm total snow amounts above the rain/snow line should be in the 6-12" range for Mt. Rainier, Mt. St. Helens, Mt. Adams, and Mt. Hood. Areas further north can generally expect to pick up less than 6" of fairly dense snowfall.

The exiting low brings an end to the shower activity Saturday evening with partial clearing overnight. A more pronounced ridge transiting the region on Sunday should allow for a mostly sunny start to the day with increasing mid and high-level clouds in the afternoon. Temperatures will be mild with freezing levels rising to 6500-7000 ft 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
Friday Night Light rain and snow developing in the evening and becoming showery after midnight.
Saturday Light rain and snow showers, locally intense in the afternoon.
Friday Night Cloudy in the evening with light to moderate rain and snow after midnight.
Saturday Decreasing light rain and snow showers, locally intense in the afternoon.
Friday Night Cloudy in the early evening with light to moderate rain and snow overnight.
Saturday Decreasing light rain and snow showers, locally intense in the afternoon.
Friday Night Moderate to occasionally heavy rain and snow from late evening onwards at Paradise with light to moderate rain/snow elsewhere.
Saturday Decreasing light rain and snow showers, locally intense in the afternoon.
Friday Night Cloudy in the evening with light rain and snow developing overnight. Light E wind becoming light to moderate overnight at the Pass.
Saturday Decreasing light rain and snow showers, locally intense in the afternoon. Decreasing light E wind.
Friday Night Cloudy in the early evening with light rain and snow developing before midnight. Light E wind becoming moderate overnight at the Pass.
Saturday Decreasing light rain and snow showers, locally intense in the afternoon. Decreasing light E wind.
Friday Night Periods of light rain and snow developing after midnight.
Saturday Light rain and snow showers, locally intense in the afternoon.
Friday Night Periods of light to moderate rain and snow developing overnight.
Saturday Decreasing light rain and snow showers, locally intense in the afternoon.
Friday Night Periods of light to moderate rain and snow from late evening onwards.
Saturday Decreasing light rain and snow showers, locally intense in the afternoon.
Friday Night Moderate rain and snow becoming heavy at times overnight. Moderate ridgeline winds with strong gusts.
Saturday Decreasing light to moderate rain and snow showers, locally intense in the afternoon. Strong ridgeline wind gusts likely through the morning hours.

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 0.25 0.25 0 0
Mt Baker Ski Area LT 0.25 0.25 0 0
Mt. Loop - Barlow Pass LT 0.10 LT 0.25 0 0
Stevens Pass LT 0.10 0.25 0 0
Snoqualmie Pass 0.25 0.25 0 0
Crystal Mt 0.25 - 0.50 0.25 LT 0.10 0
Paradise 0.50 0.25 LT 0.10 0
White Pass 0.25 0.25 LT 0.10 0
Washington Pass LT 0.10 LT 0.25 0 0
Mission Ridge LT 0.25 0.25 0 0
Salmon la Sac - Gallagher Head 0.25 0.25 0 0
Tieton River - Darland Mt. 0.25 LT 0.25 0 0
Mt Hood Meadows 0.75 -1.00 0.25 LT 0.10 0
Timberline 0.75 -1.00 0.25 LT 0.10 0
Hurricane Ridge Precipitation (in)
Friday Night LT 0.25
Saturday 0.25
Saturday Night 0
Sunday 0
Mt Baker Ski Area Precipitation (in)
Friday Night LT 0.25
Saturday 0.25
Saturday Night 0
Sunday 0
Mt. Loop - Barlow Pass Precipitation (in)
Friday Night LT 0.10
Saturday LT 0.25
Saturday Night 0
Sunday 0
Stevens Pass Precipitation (in)
Friday Night LT 0.10
Saturday 0.25
Saturday Night 0
Sunday 0
Snoqualmie Pass Precipitation (in)
Friday Night 0.25
Saturday 0.25
Saturday Night 0
Sunday 0
Crystal Mt Precipitation (in)
Friday Night 0.25 - 0.50
Saturday 0.25
Saturday Night LT 0.10
Sunday 0
Paradise Precipitation (in)
Friday Night 0.50
Saturday 0.25
Saturday Night LT 0.10
Sunday 0
White Pass Precipitation (in)
Friday Night 0.25
Saturday 0.25
Saturday Night LT 0.10
Sunday 0
Washington Pass Precipitation (in)
Friday Night LT 0.10
Saturday LT 0.25
Saturday Night 0
Sunday 0
Mission Ridge Precipitation (in)
Friday Night LT 0.25
Saturday 0.25
Saturday Night 0
Sunday 0
Salmon la Sac - Gallagher Head Precipitation (in)
Friday Night 0.25
Saturday 0.25
Saturday Night 0
Sunday 0
Tieton River - Darland Mt. Precipitation (in)
Friday Night 0.25
Saturday LT 0.25
Saturday Night 0
Sunday 0
Mt Hood Meadows Precipitation (in)
Friday Night 0.75 -1.00
Saturday 0.25
Saturday Night LT 0.10
Sunday 0
Timberline Precipitation (in)
Friday Night 0.75 -1.00
Saturday 0.25
Saturday Night LT 0.10
Sunday 0

Snow Level (ft)

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

5000' Temperatures (°F)

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

Ridgeline Winds (mph)

Friday Evening Friday Night Saturday Morning Saturday Afternoon
Olympics SSE 10-20 S 10-20 SSW 0-10 ENE 0-10
West North SSE 10-20 SSE 15-25 SSE 5-15 SSW 0-10
West Central SE 5-15 SE 15-25 SE 5-15 NW 0-10
West South S 10-20 SSE 15-25 S 5-15 W 0-10
Stevens Pass SE 5-15 ESE 10-20 ESE 5-15 NNE 0-10
Snoqualmie Pass SE 10-20 ESE 15-25 SE 5-15 NW 0-10
East North SSE 5-15 SE 15-25 ESE 10-20 E 0-10
East Central SSE 5-15 SE 10-20 SSE 5-15 ENE 0-10
East South SSE 0-10 SSE 5-15 SSW 0-10 W 0-10
Mt. Hood SSW 15-25 SW 15-25 SW 15-25 WSW 10-20
Olympics Ridgeline Winds (mph)
Friday Evening SSE 10-20
Friday Night S 10-20
Saturday Morning SSW 0-10
Saturday Afternoon ENE 0-10
West North Ridgeline Winds (mph)
Friday Evening SSE 10-20
Friday Night SSE 15-25
Saturday Morning SSE 5-15
Saturday Afternoon SSW 0-10
West Central Ridgeline Winds (mph)
Friday Evening SE 5-15
Friday Night SE 15-25
Saturday Morning SE 5-15
Saturday Afternoon NW 0-10
West South Ridgeline Winds (mph)
Friday Evening S 10-20
Friday Night SSE 15-25
Saturday Morning S 5-15
Saturday Afternoon W 0-10
Stevens Pass Ridgeline Winds (mph)
Friday Evening SE 5-15
Friday Night ESE 10-20
Saturday Morning ESE 5-15
Saturday Afternoon NNE 0-10
Snoqualmie Pass Ridgeline Winds (mph)
Friday Evening SE 10-20
Friday Night ESE 15-25
Saturday Morning SE 5-15
Saturday Afternoon NW 0-10
East North Ridgeline Winds (mph)
Friday Evening SSE 5-15
Friday Night SE 15-25
Saturday Morning ESE 10-20
Saturday Afternoon E 0-10
East Central Ridgeline Winds (mph)
Friday Evening SSE 5-15
Friday Night SE 10-20
Saturday Morning SSE 5-15
Saturday Afternoon ENE 0-10
East South Ridgeline Winds (mph)
Friday Evening SSE 0-10
Friday Night SSE 5-15
Saturday Morning SSW 0-10
Saturday Afternoon W 0-10
Mt. Hood Ridgeline Winds (mph)
Friday Evening SSW 15-25
Friday Night SW 15-25
Saturday Morning SW 15-25
Saturday Afternoon WSW 10-20

Extended Weather Synopsis

The warmth continues Sunday night under cloudy skies, but another very similar closed low tracking toward northern Oregon brings sharply cooler temperatures and more moderate rain/snow on Monday. Another ridge likely brings mostly dry weather with some low clouds trapped against the west slopes of the Cascades.

Extended Snow Level (ft)

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

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

Previous forecast from Apr 28, 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