Issued: 7:06 AM PDT Sunday, April 4, 2021
by Robert Hahn

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

Weather Synopsis

A weak front dissipates this morning as it slides SE across the central Washington Cascades on Sunday. The front features a band of low-level convergence associated with an increasingly disorganized band of rain and snow impacting the west slopes of the Cascades from HWY 2 to I-90. This band of rain and snow should shift southward across the central and southern Washington Cascades but continues to weaken. Satellite imagery depicts the back edge of the upper-level front passing over the San Juan Islands, with clearing skies to the north. With mostly cloudy skies limiting daytime heating, cooling with the frontal system should result in a continued gradual lowering of snow levels during the day. The upper-level trough shifts over the area in the afternoon and may spawn isolated rain or snow shower activity across Washington State.

Lingering snow flurries continue into the evening hours as winds shift northerly behind the trough. Clearing skies combined with mostly light winds should allow temperatures to drop significantly overnight.

Monday appears to be mostly clear and sunny with temperatures rebounding nicely in the afternoon after a cool start to the day.

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 Mostly cloudy early, then becoming partly to mostly sunny.
Sunday Night Mostly clear.
Sunday Mostly cloudy with snow flurries or isolated snow showers at times. More sun likely during the mid-day hours.
Sunday Night Scattered clouds early, then becoming mostly clear.
Sunday Light rain and snow early in the southern part of the zone. Then isolated rain and snow showers possible.
Sunday Night Partly cloudy, then becoming mostly clear overnight.
Sunday Mostly cloudy with periods of light rain and snow.
Sunday Night Partly cloudy with very light snow flurries early, then becoming mostly clear overnight.
Sunday Light rain and snow early with weak low-level convergence, then mostly cloudy with a chance for isolated rain or snow showers in the afternoon. Light W wind at the Pass.
Sunday Night Partly cloudy, then becoming mostly clear overnight. Light W wind at the Pass.
Sunday Light rain and snow with weak low-level convergence during the morning hours, then mostly cloudy with a chance for isolated rain or snow showers in the afternoon. Light W wind at the Pass.
Sunday Night Partly cloudy, then becoming mostly clear overnight. Light W wind at the Pass.
Sunday Mostly cloudy with isolated rain or snow showers in the afternoon.
Sunday Night Partly cloudy early, then becoming mostly clear.
Sunday A chance of very light rain or snow showers near the Cascade Crest.
Sunday Night A few clouds early, then becoming mostly clear.
Sunday A chance of very light rain or snow showers near the Cascade Crest.
Sunday Night Partly cloudy early, then becoming mostly clear.
Sunday Increasing mid-level clouds with a chance of a light rain or snow shower in the afternoon.
Sunday Night Partly cloudy with isolated snow flurries early, then clearing skies.

Precipitation (in)

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

Snow Level (ft)

Sunday Morning Sunday Afternoon Sunday Evening Sunday Night Monday Morning Monday Afternoon
Olympics 2500' 2500' 2500' 2500' 3000' 4500'
West North 2500' 2500' 3000' 1500' 2000' 4500'
West Central 3000' 2500' 3000' 2000' 1500' 4500'
West South 4500' 3500' 2500' 2000' 2500' 5000'
Stevens Pass 3500' 3500' 3000' 2000' 2500' 4500'
Snoqualmie Pass 3500' 3500' 2000' 2000' 2500' 4500'
East North 3500' 4000' 4000' 2500' 3000' 5500'
East Central 4000' 4000' 4000' 2500' 3000' 5500'
East South 5000' 4500' 4000' 2500' 3000' 5500'
Mt. Hood 6000' 5000' 3000' 2000' 2500' 5500'
Olympics Elevation
Sunday Morning 2500'
Sunday Afternoon 2500'
Sunday Evening 2500'
Sunday Night 2500'
Monday Morning 3000'
Monday Afternoon 4500'
West North Elevation
Sunday Morning 2500'
Sunday Afternoon 2500'
Sunday Evening 3000'
Sunday Night 1500'
Monday Morning 2000'
Monday Afternoon 4500'
West Central Elevation
Sunday Morning 3000'
Sunday Afternoon 2500'
Sunday Evening 3000'
Sunday Night 2000'
Monday Morning 1500'
Monday Afternoon 4500'
West South Elevation
Sunday Morning 4500'
Sunday Afternoon 3500'
Sunday Evening 2500'
Sunday Night 2000'
Monday Morning 2500'
Monday Afternoon 5000'
Stevens Pass Elevation
Sunday Morning 3500'
Sunday Afternoon 3500'
Sunday Evening 3000'
Sunday Night 2000'
Monday Morning 2500'
Monday Afternoon 4500'
Snoqualmie Pass Elevation
Sunday Morning 3500'
Sunday Afternoon 3500'
Sunday Evening 2000'
Sunday Night 2000'
Monday Morning 2500'
Monday Afternoon 4500'
East North Elevation
Sunday Morning 3500'
Sunday Afternoon 4000'
Sunday Evening 4000'
Sunday Night 2500'
Monday Morning 3000'
Monday Afternoon 5500'
East Central Elevation
Sunday Morning 4000'
Sunday Afternoon 4000'
Sunday Evening 4000'
Sunday Night 2500'
Monday Morning 3000'
Monday Afternoon 5500'
East South Elevation
Sunday Morning 5000'
Sunday Afternoon 4500'
Sunday Evening 4000'
Sunday Night 2500'
Monday Morning 3000'
Monday Afternoon 5500'
Mt. Hood Elevation
Sunday Morning 6000'
Sunday Afternoon 5000'
Sunday Evening 3000'
Sunday Night 2000'
Monday Morning 2500'
Monday Afternoon 5500'

5000' Temperatures (°F)

Sunday Sunday Night
Max / Min Max / Min
Olympics 32 / 23 26 / 21
West North 30 / 25 24 / 18
West Central 25 / 23 23 / 17
West South 31 / 28 27 / 20
Stevens Pass 26 / 24 24 / 16
Snoqualmie Pass 26 / 24 22 / 17
East North 30 / 23 28 / 19
East Central 29 / 25 25 / 19
East South 34 / 30 28 / 18
Mt. Hood 38 / 32 31 / 16
Olympics 5000' Temperature Forecast
(Max / Min)
Sunday 5am - 5pm 32 / 23
Sunday 5pm - 5am 26 / 21
West North 5000' Temperature Forecast
(Max / Min)
Sunday 5am - 5pm 30 / 25
Sunday 5pm - 5am 24 / 18
West Central 5000' Temperature Forecast
(Max / Min)
Sunday 5am - 5pm 25 / 23
Sunday 5pm - 5am 23 / 17
West South 5000' Temperature Forecast
(Max / Min)
Sunday 5am - 5pm 31 / 28
Sunday 5pm - 5am 27 / 20
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Sunday 5am - 5pm 26 / 24
Sunday 5pm - 5am 24 / 16
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Sunday 5am - 5pm 26 / 24
Sunday 5pm - 5am 22 / 17
East North 5000' Temperature Forecast
(Max / Min)
Sunday 5am - 5pm 30 / 23
Sunday 5pm - 5am 28 / 19
East Central 5000' Temperature Forecast
(Max / Min)
Sunday 5am - 5pm 29 / 25
Sunday 5pm - 5am 25 / 19
East South 5000' Temperature Forecast
(Max / Min)
Sunday 5am - 5pm 34 / 30
Sunday 5pm - 5am 28 / 18
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Sunday 5am - 5pm 38 / 32
Sunday 5pm - 5am 31 / 16

Ridgeline Winds (mph)

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

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

Previous forecast from Apr 3, 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