Issued: 2:40 PM PDT Monday, April 26, 2021
by Robert Hahn

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

Weather Synopsis

A broad trough over the western US, combined with a weak circulation center, maintains cool, mostly cloudy conditions. Light W winds guide weakly convective showers to focus on the west slopes of the Cascades Monday afternoon. These showers may linger into the evening hours before high pressure moves into and dries out the region. However, trapped low-level moisture should maintain trapped clouds along the west slopes of the Cascades Monday night into Tuesday morning, while the east slopes of the Cascades remain warmer and sunnier. Moisture spilling over the top of the ridge should add increasing mid and high-level clouds to the mix as the day progresses. West winds may also increase slightly in the afternoon, but should remain generally light.

The ridge expands northward Tuesday night and further on Wednesday. Temperatures should climb rapidly as a result. Freezing levels jump from 5500-7500 ft on Tuesday afternoon up to 9500-11500 ft Wednesday afternoon. Moisture spilling over the top of the ridge into British Columbia is likely to maintain mid or high-level clouds with more direct sunshine likely in southern portions of the region.

 

 

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
Monday Night Mostly cloudy skies early, then partial clearing.
Tuesday Mostly cloudy skies.
Monday Night Partly to mostly cloudy skies.
Tuesday Mostly cloudy skies.
Monday Night Partly to mostly cloudy skies.
Tuesday Mostly cloudy skies.
Monday Night Partly to mostly cloudy skies.
Tuesday Increasing clouds, becoming mostly cloudy.
Monday Night Partly to mostly cloudy skies.
Tuesday Mostly cloudy skies.
Monday Night Partly to mostly cloudy skies.
Tuesday Mostly cloudy skies.
Monday Night Partly cloudy near the Cascade crest with clear skies further east.
Tuesday Partly cloudy in the morning, then becoming mostly cloudy.
Monday Night Partly cloudy near the Cascade crest with clear skies further east.
Tuesday Mostly sunny early, then becoming partly to mostly cloudy.
Monday Night Partly cloudy near the Cascade crest with clear skies further east.
Tuesday Mostly sunny early, then becoming partly to mostly cloudy.
Monday Night Partly cloudy on the west side of Mt. Hood with clear skies further east.
Tuesday Mostly sunny early, then becoming mostly cloudy.

Precipitation (in)

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

Snow Level (ft)

Monday Evening Monday Night Tuesday Morning Tuesday Afternoon Tuesday Evening Tuesday Night Wednesday Morning Wednesday Afternoon
Olympics 5000' 5500' 5500' 6000' 6500' 7500' 9000' 9500'
West North 5000' 4500' 4500' 5500' 5500' 5500' 6500' 8500'
West Central 4500' 4500' 4500' 5500' 5500' 5500' 7500' 9000'
West South 4500' 5000' 4500' 6500' 6500' 7500' 9500' 10500'
Stevens Pass 5000' 4500' 4500' 6000' 6000' 5500' 8500' 10000'
Snoqualmie Pass 4500' 5000' 4500' 6000' 6000' 6500' 9000' 10000'
East North 5500' 4500' 5000' 6500' 6000' 5000' 7000' 9000'
East Central 5500' 5000' 5500' 7000' 7000' 8500' 10000' 10500'
East South 5500' 5000' 6000' 7500' 8500' 9000' 10500' 11000'
Mt. Hood 5500' 5000' 5500' 7500' 9500' 10000' 10500' 11500'
Olympics Elevation
Monday Evening 5000'
Monday Night 5500'
Tuesday Morning 5500'
Tuesday Afternoon 6000'
Tuesday Evening 6500'
Tuesday Night 7500'
Wednesday Morning 9000'
Wednesday Afternoon 9500'
West North Elevation
Monday Evening 5000'
Monday Night 4500'
Tuesday Morning 4500'
Tuesday Afternoon 5500'
Tuesday Evening 5500'
Tuesday Night 5500'
Wednesday Morning 6500'
Wednesday Afternoon 8500'
West Central Elevation
Monday Evening 4500'
Monday Night 4500'
Tuesday Morning 4500'
Tuesday Afternoon 5500'
Tuesday Evening 5500'
Tuesday Night 5500'
Wednesday Morning 7500'
Wednesday Afternoon 9000'
West South Elevation
Monday Evening 4500'
Monday Night 5000'
Tuesday Morning 4500'
Tuesday Afternoon 6500'
Tuesday Evening 6500'
Tuesday Night 7500'
Wednesday Morning 9500'
Wednesday Afternoon 10500'
Stevens Pass Elevation
Monday Evening 5000'
Monday Night 4500'
Tuesday Morning 4500'
Tuesday Afternoon 6000'
Tuesday Evening 6000'
Tuesday Night 5500'
Wednesday Morning 8500'
Wednesday Afternoon 10000'
Snoqualmie Pass Elevation
Monday Evening 4500'
Monday Night 5000'
Tuesday Morning 4500'
Tuesday Afternoon 6000'
Tuesday Evening 6000'
Tuesday Night 6500'
Wednesday Morning 9000'
Wednesday Afternoon 10000'
East North Elevation
Monday Evening 5500'
Monday Night 4500'
Tuesday Morning 5000'
Tuesday Afternoon 6500'
Tuesday Evening 6000'
Tuesday Night 5000'
Wednesday Morning 7000'
Wednesday Afternoon 9000'
East Central Elevation
Monday Evening 5500'
Monday Night 5000'
Tuesday Morning 5500'
Tuesday Afternoon 7000'
Tuesday Evening 7000'
Tuesday Night 8500'
Wednesday Morning 10000'
Wednesday Afternoon 10500'
East South Elevation
Monday Evening 5500'
Monday Night 5000'
Tuesday Morning 6000'
Tuesday Afternoon 7500'
Tuesday Evening 8500'
Tuesday Night 9000'
Wednesday Morning 10500'
Wednesday Afternoon 11000'
Mt. Hood Elevation
Monday Evening 5500'
Monday Night 5000'
Tuesday Morning 5500'
Tuesday Afternoon 7500'
Tuesday Evening 9500'
Tuesday Night 10000'
Wednesday Morning 10500'
Wednesday Afternoon 11500'

5000' Temperatures (°F)

Monday Night Tuesday
Max / Min Max / Min
Olympics 34 / 30 40 / 30
West North 34 / 29 39 / 29
West Central 34 / 29 40 / 29
West South 35 / 29 43 / 29
Stevens Pass 35 / 29 43 / 29
Snoqualmie Pass 34 / 29 40 / 29
East North 36 / 27 42 / 27
East Central 36 / 29 43 / 29
East South 37 / 30 47 / 30
Mt. Hood 36 / 30 48 / 30
Olympics 5000' Temperature Forecast
(Max / Min)
Monday 5pm - 5am 34 / 30
Tuesday 5am - 5pm 40 / 30
West North 5000' Temperature Forecast
(Max / Min)
Monday 5pm - 5am 34 / 29
Tuesday 5am - 5pm 39 / 29
West Central 5000' Temperature Forecast
(Max / Min)
Monday 5pm - 5am 34 / 29
Tuesday 5am - 5pm 40 / 29
West South 5000' Temperature Forecast
(Max / Min)
Monday 5pm - 5am 35 / 29
Tuesday 5am - 5pm 43 / 29
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Monday 5pm - 5am 35 / 29
Tuesday 5am - 5pm 43 / 29
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Monday 5pm - 5am 34 / 29
Tuesday 5am - 5pm 40 / 29
East North 5000' Temperature Forecast
(Max / Min)
Monday 5pm - 5am 36 / 27
Tuesday 5am - 5pm 42 / 27
East Central 5000' Temperature Forecast
(Max / Min)
Monday 5pm - 5am 36 / 29
Tuesday 5am - 5pm 43 / 29
East South 5000' Temperature Forecast
(Max / Min)
Monday 5pm - 5am 37 / 30
Tuesday 5am - 5pm 47 / 30
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Monday 5pm - 5am 36 / 30
Tuesday 5am - 5pm 48 / 30

Ridgeline Winds (mph)

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

Extended Weather Synopsis

Clouds and some very light rain or snow may impact areas near the Canadian Border Wednesday evening as a system rides over the top of the high-pressure ridge. Expect a mix of high clouds and full sunshine on Thursday. High clouds lower, thicken and may produce some light rain or snow Thursday night as a weakening front approaches. The front arrives on Friday with light rain and snow showers near and west of the Cascade Crest on WSW flow.

Extended Snow Level (ft)

Wednesday Night Thursday Thursday Night Friday
West North 9000' 10000' 9500' 7000'
Snoqualmie Pass 10000' 12000' 11500' 9000'
Mt. Hood 11500' 13500' 13000' 12000'
West North Elevation
Wednesday Night 9000'
Thursday 10000'
Thursday Night 9500'
Friday 7000'
Snoqualmie Pass Elevation
Wednesday Night 10000'
Thursday 12000'
Thursday Night 11500'
Friday 9000'
Mt. Hood Elevation
Wednesday Night 11500'
Thursday 13500'
Thursday Night 13000'
Friday 12000'

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

Previous forecast from Apr 25, 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