Issued: 7:10 AM PST Saturday, February 20, 2021
by Robert Hahn

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

Weather Synopsis

A subtle upper trough slides east on Saturday. Increasing WNW flow in the wake of the trough brings light snow showers throughout the region and weak convergence to the central Washington Cascades. High clouds streaming in ahead of the next system will make sun breaks unlikely by the afternoon. Temperatures remain cool with snow levels below pass levels. Expect 1-4" of snow today across the west slopes of the Cascades and passes.

An atmospheric river initially aimed at the central British Columbia coastline begins to spread increasing rain and snow into our region Saturday night. Snow levels remain low (1500-2500 ft), but will begin to rise toward morning. Precipitation will start off light to moderate and will end the night moderate to heavy with 3-10" of snow expected for much of the west slopes of the Washington Cascades overnight.

Expect moderate to heavy rain and snow on Sunday. Snow levels rise rapidly early Sunday morning with snow changing to rain at Snoqualmie Pass at that time. Elevations above 4000 ft should expect significant snow accumulations.

W winds should gradually increase Saturday through Saturday night and maintain in the moderate to occasionally strong range on Sunday.

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
Saturday Light snow showers.
Saturday Night Increasing light rain and snow.
Saturday Light snow showers.
Saturday Night Increasing moderate rain and snow.
Saturday Light snow showers.
Saturday Night Increasing moderate to heavy rain and snow.
Saturday Light snow showers.
Saturday Night Increasing moderate rain and snow at Paradise and White Pass; increasing light rain and snow at Crystal.
Saturday Light snow showers. Light W wind at the Pass.
Saturday Night Increasing moderate rain and snow. Light to occasionally moderate W wind at the Pass.
Saturday Light snow showers. Light to occasionally moderate W wind at the Pass.
Saturday Night Increasing moderate to heavy rain and snow. Light tomoderate W wind at the Pass.
Saturday Light snow showers.
Saturday Night Increasing light snow.
Saturday Light snow showers.
Saturday Night Increasing moderate rain and snow.
Saturday Very light snow showers, mainly near the Cascade Crest.
Saturday Night Increasing light rain and snow.
Saturday Light snow showers.
Saturday Night Increasing moderate rain and snow.

Precipitation (in)

Saturday Saturday Night Sunday
4 am - 4 pm 4 pm - 4 am 4 am - 4 pm
Hurricane Ridge LT 0.10 LT 0.25 0.25 - 0.50
Mt Baker Ski Area LT 0.25 0.50 0.75 -1.00
Mt. Loop - Barlow Pass 0.25 0.75 1.00
Stevens Pass 0.25 0.50 0.50 - 0.75
Snoqualmie Pass 0.25 0.75 1.00 - 1.50
Crystal Mt 0.25 LT 0.25 0.25 - 0.50
Paradise 0.25 0.75 1.00
White Pass 0.25 0.50 - 0.75 0.75 -1.00
Washington Pass LT 0.10 LT 0.25 0.25 - 0.50
Mission Ridge 0 LT 0.10 0.25
Salmon la Sac - Gallagher Head LT 0.25 0.50 0.75
Tieton River - Darland Mt. LT 0.10 0.25 0.50
Mt Hood Meadows LT 0.25 0.25 - 0.50 0.75 -1.00
Timberline 0.25 0.50 1.00
Hurricane Ridge Precipitation (in)
Saturday LT 0.10
Saturday Night LT 0.25
Sunday 0.25 - 0.50
Mt Baker Ski Area Precipitation (in)
Saturday LT 0.25
Saturday Night 0.50
Sunday 0.75 -1.00
Mt. Loop - Barlow Pass Precipitation (in)
Saturday 0.25
Saturday Night 0.75
Sunday 1.00
Stevens Pass Precipitation (in)
Saturday 0.25
Saturday Night 0.50
Sunday 0.50 - 0.75
Snoqualmie Pass Precipitation (in)
Saturday 0.25
Saturday Night 0.75
Sunday 1.00 - 1.50
Crystal Mt Precipitation (in)
Saturday 0.25
Saturday Night LT 0.25
Sunday 0.25 - 0.50
Paradise Precipitation (in)
Saturday 0.25
Saturday Night 0.75
Sunday 1.00
White Pass Precipitation (in)
Saturday 0.25
Saturday Night 0.50 - 0.75
Sunday 0.75 -1.00
Washington Pass Precipitation (in)
Saturday LT 0.10
Saturday Night LT 0.25
Sunday 0.25 - 0.50
Mission Ridge Precipitation (in)
Saturday 0
Saturday Night LT 0.10
Sunday 0.25
Salmon la Sac - Gallagher Head Precipitation (in)
Saturday LT 0.25
Saturday Night 0.50
Sunday 0.75
Tieton River - Darland Mt. Precipitation (in)
Saturday LT 0.10
Saturday Night 0.25
Sunday 0.50
Mt Hood Meadows Precipitation (in)
Saturday LT 0.25
Saturday Night 0.25 - 0.50
Sunday 0.75 -1.00
Timberline Precipitation (in)
Saturday 0.25
Saturday Night 0.50
Sunday 1.00

Snow Level (ft)

Saturday Morning Saturday Afternoon Saturday Evening Saturday Night Sunday Morning Sunday Afternoon
Olympics 1500' 2000' 2000' 2500' 4000' 4500'
West North 1500' 2000' 1500' 1000' 2000' 3500'
West Central 1500' 2000' 2000' 1500' 2500' 3500'
West South 1500' 2000' 2000' 2000' 3000' 4000'
Stevens Pass 1500' 2000' 2000' 1500' 2500' 4000'
Snoqualmie Pass 1500' 2000' 2000' 2000' 3000' 4000'
East North 1000' 2000' 1500' 1000' 1500' 4000'
East Central 1000' 2000' 2000' 1500' 2500' 4000'
East South 1000' 2500' 2000' 1500' 2500' 4500'
Mt. Hood 1500' 2500' 2500' 2000' 2500' 4000'
Olympics Elevation
Saturday Morning 1500'
Saturday Afternoon 2000'
Saturday Evening 2000'
Saturday Night 2500'
Sunday Morning 4000'
Sunday Afternoon 4500'
West North Elevation
Saturday Morning 1500'
Saturday Afternoon 2000'
Saturday Evening 1500'
Saturday Night 1000'
Sunday Morning 2000'
Sunday Afternoon 3500'
West Central Elevation
Saturday Morning 1500'
Saturday Afternoon 2000'
Saturday Evening 2000'
Saturday Night 1500'
Sunday Morning 2500'
Sunday Afternoon 3500'
West South Elevation
Saturday Morning 1500'
Saturday Afternoon 2000'
Saturday Evening 2000'
Saturday Night 2000'
Sunday Morning 3000'
Sunday Afternoon 4000'
Stevens Pass Elevation
Saturday Morning 1500'
Saturday Afternoon 2000'
Saturday Evening 2000'
Saturday Night 1500'
Sunday Morning 2500'
Sunday Afternoon 4000'
Snoqualmie Pass Elevation
Saturday Morning 1500'
Saturday Afternoon 2000'
Saturday Evening 2000'
Saturday Night 2000'
Sunday Morning 3000'
Sunday Afternoon 4000'
East North Elevation
Saturday Morning 1000'
Saturday Afternoon 2000'
Saturday Evening 1500'
Saturday Night 1000'
Sunday Morning 1500'
Sunday Afternoon 4000'
East Central Elevation
Saturday Morning 1000'
Saturday Afternoon 2000'
Saturday Evening 2000'
Saturday Night 1500'
Sunday Morning 2500'
Sunday Afternoon 4000'
East South Elevation
Saturday Morning 1000'
Saturday Afternoon 2500'
Saturday Evening 2000'
Saturday Night 1500'
Sunday Morning 2500'
Sunday Afternoon 4500'
Mt. Hood Elevation
Saturday Morning 1500'
Saturday Afternoon 2500'
Saturday Evening 2500'
Saturday Night 2000'
Sunday Morning 2500'
Sunday Afternoon 4000'

5000' Temperatures (°F)

Saturday Saturday Night
Max / Min Max / Min
Olympics 24 / 19 28 / 21
West North 22 / 21 25 / 20
West Central 23 / 21 24 / 21
West South 25 / 21 26 / 22
Stevens Pass 24 / 22 26 / 21
Snoqualmie Pass 23 / 22 25 / 21
East North 25 / 17 25 / 19
East Central 25 / 19 24 / 20
East South 26 / 19 23 / 20
Mt. Hood 25 / 22 24 / 21
Olympics 5000' Temperature Forecast
(Max / Min)
Saturday 4am - 4pm 24 / 19
Saturday 4pm - 4am 28 / 21
West North 5000' Temperature Forecast
(Max / Min)
Saturday 4am - 4pm 22 / 21
Saturday 4pm - 4am 25 / 20
West Central 5000' Temperature Forecast
(Max / Min)
Saturday 4am - 4pm 23 / 21
Saturday 4pm - 4am 24 / 21
West South 5000' Temperature Forecast
(Max / Min)
Saturday 4am - 4pm 25 / 21
Saturday 4pm - 4am 26 / 22
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Saturday 4am - 4pm 24 / 22
Saturday 4pm - 4am 26 / 21
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Saturday 4am - 4pm 23 / 22
Saturday 4pm - 4am 25 / 21
East North 5000' Temperature Forecast
(Max / Min)
Saturday 4am - 4pm 25 / 17
Saturday 4pm - 4am 25 / 19
East Central 5000' Temperature Forecast
(Max / Min)
Saturday 4am - 4pm 25 / 19
Saturday 4pm - 4am 24 / 20
East South 5000' Temperature Forecast
(Max / Min)
Saturday 4am - 4pm 26 / 19
Saturday 4pm - 4am 23 / 20
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Saturday 4am - 4pm 25 / 22
Saturday 4pm - 4am 24 / 21

Ridgeline Winds (mph)

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

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

Previous forecast from Feb 19, 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