Issued: 7:12 AM PDT Thursday, April 8, 2021
by Robert Hahn

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

Weather Synopsis

A trough lingers early Wednesday morning behind a frontal system that passed through the region Wednesday night. 5000 ft temperatures have cooled sharply into the upper 10s and low 20s across the region. Most of the shower activity will be light and decreasing as the trough exits to our east and W winds decrease. However, a convergence zone continues to bring some moderate snow to the I-90 corridor. That too should ease by mid-morning. The west slopes of the Cascades can expect up to 3" of additional low-density snow with minimal spillover east of the Cascade Crest. As the snow showers ease, expect increasing sun breaks throughout the day with more sun than clouds both east of the Cascade Crest and in the Olympics. Strong ridgeline winds continue to buffet the Mt. Hood area, but should ramp down rapidly during the morning hours. Moderate to strong ridgeline winds east of the Cascade Crest should also slowly decrease.

A weak ridge between systems should bring fair weather with light winds and cold temperatures on Thursday night. In the early morning hours, clouds begin to increase ahead of the next system dropping SE toward our region.

Light rain and snow gradually spread into NW Washington on Friday with snow levels remaining low. Ridgeline winds also increase into the moderate range. Further south and east, temperatures should be somewhat milder and more typical of April with freezing levels around 5500 ft for Mt. Hood.

 

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
Thursday A few snow flurries early then scattered clouds.
Thursday Night Scattered clouds.
Thursday Mostly cloudy with snow showers gradually decreasing.
Thursday Night Scattered clouds in the evening with increasing clouds after midnight.
Thursday Decreasing light snow showers with mostly cloudy skies.
Thursday Night Scattered clouds in the evening with increasing clouds after midnight.
Thursday Mostly cloudy skies with decreasing light snow showers.
Thursday Night Partly cloudy.
Thursday Decreasing light snow showers with mostly cloudy skies. Decreasing light W wind at the Pass.
Thursday Night Partly cloudy. Light W wind at the Pass.
Thursday Convergence lingering into the mid-morning hours with periods of moderate snow, then decreasing light snow showers. Sun breaks likely in the afternoon. Decreasing light to occasionally moderate W wind at the Pass.
Thursday Night Partly cloudy. Light W wind at the Pass.
Thursday Partly cloudy with light snow showers at times near the Cascade Crest. Clearing skies further east.
Thursday Night Increasing clouds.
Thursday Partly cloudy with light snow showers at times near the Cascade Crest. Clearing skies further east.
Thursday Night Partly cloudy.
Thursday Partly cloudy with a chance of light snow showers.
Thursday Night Mostly clear.
Thursday Light snow showers decreasing during the morning hours with strong ridgeline winds gradually easing. Partially clearing skies during the afternoon.
Thursday Night Mostly clear.

Precipitation (in)

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

Snow Level (ft)

Thursday Morning Thursday Afternoon Thursday Evening Thursday Night Friday Morning Friday Afternoon
Olympics 1500' 2500' 3000' 1500' 1500' 2000'
West North 1000' 2000' 2500' 1000' 500' 2000'
West Central 1500' 2000' 2500' 1000' 1500' 2500'
West South 1500' 2500' 3000' 1500' 2000' 4500'
Stevens Pass 1000' 2500' 2500' 1000' 2000' 4000'
Snoqualmie Pass 1500' 2500' 3000' 2000' 2000' 4000'
East North 1500' 3000' 3500' 2000' 2000' 4000'
East Central 1500' 3000' 3500' 2000' 2000' 5000'
East South 1500' 3000' 3500' 2000' 2500' 5500'
Mt. Hood 2000' 2500' 3500' 2000' 3000' 5500'
Olympics Elevation
Thursday Morning 1500'
Thursday Afternoon 2500'
Thursday Evening 3000'
Thursday Night 1500'
Friday Morning 1500'
Friday Afternoon 2000'
West North Elevation
Thursday Morning 1000'
Thursday Afternoon 2000'
Thursday Evening 2500'
Thursday Night 1000'
Friday Morning 500'
Friday Afternoon 2000'
West Central Elevation
Thursday Morning 1500'
Thursday Afternoon 2000'
Thursday Evening 2500'
Thursday Night 1000'
Friday Morning 1500'
Friday Afternoon 2500'
West South Elevation
Thursday Morning 1500'
Thursday Afternoon 2500'
Thursday Evening 3000'
Thursday Night 1500'
Friday Morning 2000'
Friday Afternoon 4500'
Stevens Pass Elevation
Thursday Morning 1000'
Thursday Afternoon 2500'
Thursday Evening 2500'
Thursday Night 1000'
Friday Morning 2000'
Friday Afternoon 4000'
Snoqualmie Pass Elevation
Thursday Morning 1500'
Thursday Afternoon 2500'
Thursday Evening 3000'
Thursday Night 2000'
Friday Morning 2000'
Friday Afternoon 4000'
East North Elevation
Thursday Morning 1500'
Thursday Afternoon 3000'
Thursday Evening 3500'
Thursday Night 2000'
Friday Morning 2000'
Friday Afternoon 4000'
East Central Elevation
Thursday Morning 1500'
Thursday Afternoon 3000'
Thursday Evening 3500'
Thursday Night 2000'
Friday Morning 2000'
Friday Afternoon 5000'
East South Elevation
Thursday Morning 1500'
Thursday Afternoon 3000'
Thursday Evening 3500'
Thursday Night 2000'
Friday Morning 2500'
Friday Afternoon 5500'
Mt. Hood Elevation
Thursday Morning 2000'
Thursday Afternoon 2500'
Thursday Evening 3500'
Thursday Night 2000'
Friday Morning 3000'
Friday Afternoon 5500'

5000' Temperatures (°F)

Thursday Thursday Night
Max / Min Max / Min
Olympics 30 / 19 28 / 20
West North 29 / 20 27 / 20
West Central 28 / 20 27 / 19
West South 31 / 21 27 / 20
Stevens Pass 29 / 21 27 / 19
Snoqualmie Pass 28 / 20 27 / 19
East North 31 / 20 28 / 20
East Central 30 / 20 27 / 21
East South 32 / 21 30 / 22
Mt. Hood 33 / 24 32 / 24
Olympics 5000' Temperature Forecast
(Max / Min)
Thursday 5am - 5pm 30 / 19
Thursday 5pm - 5am 28 / 20
West North 5000' Temperature Forecast
(Max / Min)
Thursday 5am - 5pm 29 / 20
Thursday 5pm - 5am 27 / 20
West Central 5000' Temperature Forecast
(Max / Min)
Thursday 5am - 5pm 28 / 20
Thursday 5pm - 5am 27 / 19
West South 5000' Temperature Forecast
(Max / Min)
Thursday 5am - 5pm 31 / 21
Thursday 5pm - 5am 27 / 20
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Thursday 5am - 5pm 29 / 21
Thursday 5pm - 5am 27 / 19
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Thursday 5am - 5pm 28 / 20
Thursday 5pm - 5am 27 / 19
East North 5000' Temperature Forecast
(Max / Min)
Thursday 5am - 5pm 31 / 20
Thursday 5pm - 5am 28 / 20
East Central 5000' Temperature Forecast
(Max / Min)
Thursday 5am - 5pm 30 / 20
Thursday 5pm - 5am 27 / 21
East South 5000' Temperature Forecast
(Max / Min)
Thursday 5am - 5pm 32 / 21
Thursday 5pm - 5am 30 / 22
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Thursday 5am - 5pm 33 / 24
Thursday 5pm - 5am 32 / 24

Ridgeline Winds (mph)

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

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

Previous forecast from Apr 7, 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