Issued: 2:35 PM PDT Sunday, April 20, 2025
by Josh Lipkowitz

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

Weather Synopsis

An upper-level trough is passing over Washington this afternoon, bringing light showers to many mountain locations, especially west of the crest and I-90 north, along with increasing westerly winds. This activity is becoming a bit more widespread this afternoon as the trough marches east. Precipitation totals are pretty light thus far, and with 5000ft temperatures generally in the low to mid 30s, accumulations up until now will have been relegated to the mid and upper elevations. Even there, daytime totals should be less than a few inches in the most favored zones. This evening, a Puget Sound Convergence Zone will develop and indications are that it will take aim at the Snoqualmie Pass area, with some spillover into Stevens and the West Central. The heaviest precipitation looks to fall between 8 PM and 2 AM, when we expect to see a few inches of snow accumulate at pass level, with perhaps 5-8" up high in the bullseye, as snow levels bottom out at 2500ft overnight. Outside of the convergence zone, precipitation totals are paltry. Winds remain in the light to moderate range with the exception of the East Central, East South, and Mt. Hood, where stronger winds will be felt through midday Monday. 

Things start to dry out on Monday, with some lingering shower activity hanging around the west side, I-90 northward. Elsewhere, sun breaks will become more widespread, especially east of the crest and south, and at the mid and upper elevations. Dry north to northwest flow continues on Tuesday as a high-pressure ridge builds offshore. Temperatures will be slightly cooler on the west slopes than east, with 5000ft highs reaching the low to mid 30s. We expect plenty of sunshine and generally light to moderate winds.

 

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 Partial clearing skies with a chance of a stray snow shower. Moderate westerly ridgeline winds decrease to light.
Monday Partly cloudy to partly sunny. Cool with light ridgeline winds.
Sunday Night Light snow showers begin to taper overnight. Some partial clearing late. Moderate ridgeline winds decreasing overnight.
Monday A stray lingering snow shower, mostly to partly cloudy skies with sun breaks, especially higher on the slopes. Light ridgeline winds.
Sunday Night Light snow showers with moderate ridgeline winds, decreasing overnight.
Monday Scattered light snow showers with some sun breaks late. Light ridgeline winds.
Sunday Night Light snow showers begin to taper overnight. Some partial clearing late. Moderate ridgeline winds decreasing overnight.
Monday Partly cloudy to partly sunny. Maybe a stray snow shower with light ridgeline winds.
Sunday Night Rain and snow showers, becoming all snow in the evening and overnight and decreasing late. Precipitation may be heavier at times locally. Moderate ridgeline winds.
Monday Scattered light snow showers with some sun breaks late. Light to moderate ridgeline winds.
Sunday Night Rain and snow, becoming all snow in the evening and overnight and decreasing late. Precipitation may be heavier at times locally. Moderate ridgeline winds.
Monday Scattered light snow showers with some sun breaks late. Light to moderate ridgeline winds.
Sunday Night Scattered light snow showers with moderate ridgeline winds, decreasing overnight. Partial clearing late.
Monday Mostly to partly cloudy skies with a stray snow showers and light ridgeline winds.
Sunday Night Scattered light snow showers near the crest with moderate to strong ridgeline winds. Partial clearing late.
Monday Partly cloudy to partly sunny skies. Perhaps a stray flurry. Sunnier further east of the crest. Moderate to locally strong ridgeline winds.
Sunday Night Scattered light snow showers near the crest with moderate to strong ridgeline winds. Partial clearing late.
Monday Partly cloudy to partly sunny skies. Perhaps a stray flurry. Sunnier further east of the crest. Moderate to locally strong ridgeline winds.
Sunday Night Scattered light snow showers begin to taper overnight. Some partial clearing late. Moderate to strong ridgeline winds decreasing overnight.
Monday Partly cloudy to mostly sunny skies. Winds decrease to light to moderate in the afternoon.

Issued: 2:35 PM PDT Sunday, April 20, 2025

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

Issued: 2:35 PM PDT Sunday, April 20, 2025

Snow Level (ft)

Sunday Evening Sunday Night Monday Morning Monday Afternoon Monday Evening Monday Night Tuesday Morning Tuesday Afternoon
Olympics 4000' 3000' 2500' 4000' 4000' 4000' 3500' 4500'
West North 3500' 3000' 2500' 3500' 4000' 3000' 3000' 4500'
West Central 3500' 3000' 2500' 3500' 4000' 3500' 3500' 4500'
West South 4000' 3000' 3000' 4500' 4500' 3500' 3500' 5500'
Stevens Pass 3500' 3000' 2500' 4000' 4000' 3500' 3500' 5000'
Snoqualmie Pass 4000' 3000' 2500' 4000' 4000' 3500' 3500' 4500'
East North 3500' 3500' 3000' 5000' 5000' 3500' 3500' 6000'
East Central 4000' 3500' 3000' 5000' 5000' 4000' 4000' 5500'
East South 4000' 3500' 3000' 5000' 5000' 3500' 4000' 6000'
Mt. Hood 4500' 3500' 3000' 4500' 5000' 3500' 3500' 5000'
Olympics Elevation
Sunday Evening 4000'
Sunday Night 3000'
Monday Morning 2500'
Monday Afternoon 4000'
Monday Evening 4000'
Monday Night 4000'
Tuesday Morning 3500'
Tuesday Afternoon 4500'
West North Elevation
Sunday Evening 3500'
Sunday Night 3000'
Monday Morning 2500'
Monday Afternoon 3500'
Monday Evening 4000'
Monday Night 3000'
Tuesday Morning 3000'
Tuesday Afternoon 4500'
West Central Elevation
Sunday Evening 3500'
Sunday Night 3000'
Monday Morning 2500'
Monday Afternoon 3500'
Monday Evening 4000'
Monday Night 3500'
Tuesday Morning 3500'
Tuesday Afternoon 4500'
West South Elevation
Sunday Evening 4000'
Sunday Night 3000'
Monday Morning 3000'
Monday Afternoon 4500'
Monday Evening 4500'
Monday Night 3500'
Tuesday Morning 3500'
Tuesday Afternoon 5500'
Stevens Pass Elevation
Sunday Evening 3500'
Sunday Night 3000'
Monday Morning 2500'
Monday Afternoon 4000'
Monday Evening 4000'
Monday Night 3500'
Tuesday Morning 3500'
Tuesday Afternoon 5000'
Snoqualmie Pass Elevation
Sunday Evening 4000'
Sunday Night 3000'
Monday Morning 2500'
Monday Afternoon 4000'
Monday Evening 4000'
Monday Night 3500'
Tuesday Morning 3500'
Tuesday Afternoon 4500'
East North Elevation
Sunday Evening 3500'
Sunday Night 3500'
Monday Morning 3000'
Monday Afternoon 5000'
Monday Evening 5000'
Monday Night 3500'
Tuesday Morning 3500'
Tuesday Afternoon 6000'
East Central Elevation
Sunday Evening 4000'
Sunday Night 3500'
Monday Morning 3000'
Monday Afternoon 5000'
Monday Evening 5000'
Monday Night 4000'
Tuesday Morning 4000'
Tuesday Afternoon 5500'
East South Elevation
Sunday Evening 4000'
Sunday Night 3500'
Monday Morning 3000'
Monday Afternoon 5000'
Monday Evening 5000'
Monday Night 3500'
Tuesday Morning 4000'
Tuesday Afternoon 6000'
Mt. Hood Elevation
Sunday Evening 4500'
Sunday Night 3500'
Monday Morning 3000'
Monday Afternoon 4500'
Monday Evening 5000'
Monday Night 3500'
Tuesday Morning 3500'
Tuesday Afternoon 5000'

Issued: 2:35 PM PDT Sunday, April 20, 2025

5000' Temperatures (°F)

Sunday Night Monday
Max / Min Max / Min
Olympics 30 / 25 32 / 25
West North 31 / 26 32 / 26
West Central 30 / 26 32 / 26
West South 33 / 26 34 / 26
Stevens Pass 32 / 26 32 / 26
Snoqualmie Pass 30 / 26 32 / 26
East North 32 / 27 35 / 27
East Central 34 / 28 35 / 28
East South 35 / 28 35 / 28
Mt. Hood 36 / 28 35 / 28
Olympics 5000' Temperature Forecast
(Max / Min)
Sunday Night 30 / 25
Monday 32 / 25
West North 5000' Temperature Forecast
(Max / Min)
Sunday Night 31 / 26
Monday 32 / 26
West Central 5000' Temperature Forecast
(Max / Min)
Sunday Night 30 / 26
Monday 32 / 26
West South 5000' Temperature Forecast
(Max / Min)
Sunday Night 33 / 26
Monday 34 / 26
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Sunday Night 32 / 26
Monday 32 / 26
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Sunday Night 30 / 26
Monday 32 / 26
East North 5000' Temperature Forecast
(Max / Min)
Sunday Night 32 / 27
Monday 35 / 27
East Central 5000' Temperature Forecast
(Max / Min)
Sunday Night 34 / 28
Monday 35 / 28
East South 5000' Temperature Forecast
(Max / Min)
Sunday Night 35 / 28
Monday 35 / 28
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Sunday Night 36 / 28
Monday 35 / 28

Issued: 2:35 PM PDT Sunday, April 20, 2025

Ridgeline Winds (mph)

Sunday Evening Sunday Night Monday Morning Monday Afternoon
Olympics W 10-20 W 5-15 W 0-10 W 0-10
West North W 10-20 W 5-15 W 0-10 W 0-10
West Central NW 10-20 NW 5-15 WNW 0-10 W 0-10
West South WNW 15-25 WNW 10-20 WNW 5-15 WNW 5-15
Stevens Pass WNW 10-20 WNW 10-20 WNW 5-15 WNW 5-15
Snoqualmie Pass WNW 15-25 WNW 10-20 WNW 5-15 WNW 5-15
East North W 10-20 WNW 5-15 WNW 5-15 WNW 5-15
East Central WNW 30-40 NW 25-35 NW 15-25 NW 15-25
East South WNW 20-30 WNW 15-25 WNW 10-20 WNW 10-20
Mt. Hood WNW 25-35 WNW 30-40 NW 15-25 NW 10-20
Olympics Ridgeline Winds (mph)
Sunday Evening W 10-20
Sunday Night W 5-15
Monday Morning W 0-10
Monday Afternoon W 0-10
West North Ridgeline Winds (mph)
Sunday Evening W 10-20
Sunday Night W 5-15
Monday Morning W 0-10
Monday Afternoon W 0-10
West Central Ridgeline Winds (mph)
Sunday Evening NW 10-20
Sunday Night NW 5-15
Monday Morning WNW 0-10
Monday Afternoon W 0-10
West South Ridgeline Winds (mph)
Sunday Evening WNW 15-25
Sunday Night WNW 10-20
Monday Morning WNW 5-15
Monday Afternoon WNW 5-15
Stevens Pass Ridgeline Winds (mph)
Sunday Evening WNW 10-20
Sunday Night WNW 10-20
Monday Morning WNW 5-15
Monday Afternoon WNW 5-15
Snoqualmie Pass Ridgeline Winds (mph)
Sunday Evening WNW 15-25
Sunday Night WNW 10-20
Monday Morning WNW 5-15
Monday Afternoon WNW 5-15
East North Ridgeline Winds (mph)
Sunday Evening W 10-20
Sunday Night WNW 5-15
Monday Morning WNW 5-15
Monday Afternoon WNW 5-15
East Central Ridgeline Winds (mph)
Sunday Evening WNW 30-40
Sunday Night NW 25-35
Monday Morning NW 15-25
Monday Afternoon NW 15-25
East South Ridgeline Winds (mph)
Sunday Evening WNW 20-30
Sunday Night WNW 15-25
Monday Morning WNW 10-20
Monday Afternoon WNW 10-20
Mt. Hood Ridgeline Winds (mph)
Sunday Evening WNW 25-35
Sunday Night WNW 30-40
Monday Morning NW 15-25
Monday Afternoon NW 10-20

Issued: 2:35 PM PDT Sunday, April 20, 2025

Extended Weather Synopsis

The high-pressure ridge shifts onshore Wednesday morning, bringing continued warm weather and sunshine to the mountains. The ridge builds further into Thursday, as temperatures peak and freezing levels jump up to 7000-9000ft. It should be a couple of gorgeous days in the hills. Late Thursday into Friday, the ridge shifts east as we may be impacted by the next weathermaker Friday to Saturday. 

 

 

Extended Snow Level (ft)

Tuesday Night Wednesday Wednesday Night Thursday *
West North 4000' 5500' 6000' 7500'
Snoqualmie Pass 3500' 6000' 7000' 7000'
Mt. Hood 4500' 7000' 8500' 9000'
West North Elevation
Tuesday Night 4000'
Wednesday 5500'
Wednesday Night 6000'
Thursday * 7500'
Snoqualmie Pass Elevation
Tuesday Night 3500'
Wednesday 6000'
Wednesday Night 7000'
Thursday * 7000'
Mt. Hood Elevation
Tuesday Night 4500'
Wednesday 7000'
Wednesday Night 8500'
Thursday * 9000'

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

Previous forecast from Apr 19, 2025

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’.