Issued: 2:21 PM PDT Sunday, April 25, 2021
by Dallas Glass

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

Weather Synopsis

Rain and snow showers dot the region this afternoon near and west of the Cascade crest. This pattern should persist Sunday night into Monday before drier weather prevails for much of the remainder of the week. A cut-off low pressure drifting east over Oregan continues to leave plenty of moisture and a slightly unstable atmosphere in its wake. This will help maintain showers across the western half of the forecast area with small convective clouds further east. Any burst of precipitation should generally be short-lived and result in little more than a dusting of new snow. During the day, periods of sunshine and warm temperatures will further limit any snow accumulation despite relatively cool snow levels. Most locations should see noticeable more sunshine on Monday than they did over the weekend. Low-level clouds could continue to linger in some of the mountain valleys and passes, but as the day continues many areas should see significant sun breaks. 

By Monday night, the exiting low gives way to a building high-pressure ridge off the coast. This should help our region dry out and warm up. Look for mostly clear skies, light winds, and mild temperatures as we head into the middle of the week. 

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
Sunday Night Mostly cloudy with isolated showers.
Monday Partly to mostly cloudy with isolated showers.
Sunday Night Cloudy with isolated showers possible.
Monday Partly to mostly cloudy with isolated showers. Winds increasing slightly in the afternoon.
Sunday Night Cloudy with isolated showers possible.
Monday Partly to mostly cloudy with isolated showers.
Sunday Night Partly to mostly cloudy with isolated showers lingering into the evening.
Monday Partly to mostly cloudy with significant sun breaks. Isolated showers possible. Light WNW winds increasing slightly in the afternoon.
Sunday Night Cloudy with isolated showers possible. Light W winds.
Monday Partly to mostly cloudy with significant sun breaks. Isolated showers possible. Light to moderate WNW winds.
Sunday Night Cloudy with isolated showers possibly lingering into the evening. Light W winds.
Monday Partly to mostly cloudy with low clouds in the Pass. Isolated showers possible. Light to moderate WNW winds.
Sunday Night Partly to mostly cloudy. Very isolated showers possible near the crest.
Monday Partly cloudy to mostly sunny with the possibility for very isolated showers near the crest.
Sunday Night Partly to mostly cloudy. Very isolated showers possible near the crest.
Monday Partly cloudy to mostly sunny with the possibility for very isolated showers near the crest.
Sunday Night Partly to mostly cloudy. Very isolated showers possible near the crest.
Monday Partly cloudy to mostly sunny with the possibility for very isolated showers near the crest.
Sunday Night Mostly cloudy with the chance for isolated showers. Moderate NW winds.
Monday Partly to mostly cloudy with significant sun breaks. Isolated showers possible. Moderate NW winds increasing slightly in the afternoon.

Issued: 2:21 PM PDT Sunday, April 25, 2021

Precipitation (in)

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

Issued: 2:21 PM PDT Sunday, April 25, 2021

Snow Level (ft)

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

Issued: 2:21 PM PDT Sunday, April 25, 2021

5000' Temperatures (°F)

Sunday Night Monday
Max / Min Max / Min
Olympics 32 / 25 36 / 23
West North 32 / 27 34 / 29
West Central 32 / 28 34 / 28
West South 35 / 25 37 / 25
Stevens Pass 33 / 29 36 / 29
Snoqualmie Pass 32 / 28 34 / 28
East North 35 / 27 39 / 28
East Central 34 / 28 37 / 28
East South 37 / 25 39 / 25
Mt. Hood 36 / 27 38 / 27
Olympics 5000' Temperature Forecast
(Max / Min)
Sunday Night 32 / 25
Monday 36 / 23
West North 5000' Temperature Forecast
(Max / Min)
Sunday Night 32 / 27
Monday 34 / 29
West Central 5000' Temperature Forecast
(Max / Min)
Sunday Night 32 / 28
Monday 34 / 28
West South 5000' Temperature Forecast
(Max / Min)
Sunday Night 35 / 25
Monday 37 / 25
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Sunday Night 33 / 29
Monday 36 / 29
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Sunday Night 32 / 28
Monday 34 / 28
East North 5000' Temperature Forecast
(Max / Min)
Sunday Night 35 / 27
Monday 39 / 28
East Central 5000' Temperature Forecast
(Max / Min)
Sunday Night 34 / 28
Monday 37 / 28
East South 5000' Temperature Forecast
(Max / Min)
Sunday Night 37 / 25
Monday 39 / 25
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Sunday Night 36 / 27
Monday 38 / 27

Issued: 2:21 PM PDT Sunday, April 25, 2021

Ridgeline Winds (mph)

Sunday Evening Sunday Night Monday Morning Monday Afternoon
Olympics VAR 0-10 VAR 0-10 VAR 0-10 VAR 0-10
West North SW 0-10 W 0-10 W 0-10 W 5-15
West Central W 5-15 W 5-15 WNW 5-15 NW 5-15
West South W 5-15 W 5-15 WNW 5-15 WNW 10-20
Stevens Pass W 5-15 W 5-15 WNW 10-20 WNW 10-20
Snoqualmie Pass W 5-15 W 5-15 WNW 10-20 WNW 10-20
East North WNW 5-15 NW 5-15 NW 5-15 WNW 5-15
East Central NW 5-15 NNW 5-15 NNW 0-10 NW 5-15
East South NW 5-15 VAR 0-10 NNW 0-10 NW 5-15
Mt. Hood NW 10-20 NW 10-20 NW 5-15 NW 10-20
Olympics Ridgeline Winds (mph)
Sunday Evening VAR 0-10
Sunday Night VAR 0-10
Monday Morning VAR 0-10
Monday Afternoon VAR 0-10
West North Ridgeline Winds (mph)
Sunday Evening SW 0-10
Sunday Night W 0-10
Monday Morning W 0-10
Monday Afternoon W 5-15
West Central Ridgeline Winds (mph)
Sunday Evening W 5-15
Sunday Night W 5-15
Monday Morning WNW 5-15
Monday Afternoon NW 5-15
West South Ridgeline Winds (mph)
Sunday Evening W 5-15
Sunday Night W 5-15
Monday Morning WNW 5-15
Monday Afternoon WNW 10-20
Stevens Pass Ridgeline Winds (mph)
Sunday Evening W 5-15
Sunday Night W 5-15
Monday Morning WNW 10-20
Monday Afternoon WNW 10-20
Snoqualmie Pass Ridgeline Winds (mph)
Sunday Evening W 5-15
Sunday Night W 5-15
Monday Morning WNW 10-20
Monday Afternoon WNW 10-20
East North Ridgeline Winds (mph)
Sunday Evening WNW 5-15
Sunday Night NW 5-15
Monday Morning NW 5-15
Monday Afternoon WNW 5-15
East Central Ridgeline Winds (mph)
Sunday Evening NW 5-15
Sunday Night NNW 5-15
Monday Morning NNW 0-10
Monday Afternoon NW 5-15
East South Ridgeline Winds (mph)
Sunday Evening NW 5-15
Sunday Night VAR 0-10
Monday Morning NNW 0-10
Monday Afternoon NW 5-15
Mt. Hood Ridgeline Winds (mph)
Sunday Evening NW 10-20
Sunday Night NW 10-20
Monday Morning NW 5-15
Monday Afternoon NW 10-20

Issued: 2:21 PM PDT Sunday, April 25, 2021

Extended Weather Synopsis

Warm and dry weather appears to prevail for the bulk of the forecast region this week. As a high-pressure ridge builds off the coast on Tuesday, we should see a return to warm days and cooler nights. Freezing levels will begin a steady climb as warmer air flows into the area from the south. For now, the ridge seems to deflect an approaching storm to the north. This could result in an increase in cloud cover mid-week and the possibility of a stray shower impacting locations near the Canadian border. Some uncertainty remains in the long-term forecast, as weather models continue to struggle to fully agree on the strength and positioning of the protective ridge. 

Extended Snow Level (ft)

Tuesday Night Wednesday Wednesday Night Thursday
West North 5500' 7500' 8500' 9500'
Snoqualmie Pass 6000' 8500' 9500' 11500'
Mt. Hood 10000' 11000' 12000' 13000'
West North Elevation
Tuesday Night 5500'
Wednesday 7500'
Wednesday Night 8500'
Thursday 9500'
Snoqualmie Pass Elevation
Tuesday Night 6000'
Wednesday 8500'
Wednesday Night 9500'
Thursday 11500'
Mt. Hood Elevation
Tuesday Night 10000'
Wednesday 11000'
Wednesday Night 12000'
Thursday 13000'

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

Previous forecast from Apr 24, 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’.