Issued: 2:08 PM PST Thursday, January 20, 2022
by Robert Hahn

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

Weather Synopsis

Temperatures were slow to cool on Thursday behind a warm and wet frontal system that passed during the morning hours. A subtle disturbance arriving with the upper trough Thursday evening will bring instability and re-invigorate the convergence that remains relatively stationary around the Stevens Pass area early Thursday afternoon. Stevens Pass should transition to all snow by around 4 PM and Snoqualmie should transition a few hours later. Mild temperatures should limit accumulations at Pass levels to around 1-3", but higher elevations could pick up 3-5" in the central Washington Cascades.

NNW flow dries the region out with tapering rain/snow showers overnight Thursday as the upper trough quickly exits east. A powerful high off the California coastline extends a ridge axis into our near-shore waters. Temperatures should fall below freezing in most areas, but skies west of the Cascade Crest will be slow to clear.

The ridge dominates our weather pattern Friday through Saturday. Friday should be dry with a cool-ish start. Inversions formed overnight in valley locations may be slower to warm, but mid and upper elevations will warm more rapidly. Warming takes hold first in the Olympics and the southern Cascades, expanding northward. Cloud cover will decrease throughout the day but will remain longest along the west slopes of the northern Washington Cascades. Friday night should be mild with light winds and mostly clear skies. Saturday should be very warm with sinking air under the offshore ridge producing above freezing temperatures across most of the region. Freezing levels should top out in the 10,000-11,500 ft range Saturday afternoon.

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 Night Light rain and snow showers possible during the evening, then becoming partly cloudy.
Friday Partly cloudy. Cool start then rapidly warming temperatures.
Thursday Night Light rain and snow showers mostly end by midnight.
Friday Mostly cloudy in the morning, then becoming partly cloudy. Warming temperatures.
Thursday Night Light to moderate rain/snow showers and convergence during the evening, then tapering to light showers overnight.
Friday Mostly cloudy in the morning, then becoming partly cloudy. Warming temperatures.
Thursday Night Decreasing light rain and snow showers mostly ending by morning.
Friday Partly cloudy in the morning with mostly clearing skies later in the day. Warming temperatures.
Thursday Night Light to moderate rain/snow showers and convergence heaviest during the early evening, then tapering to very light showers overnight. Decreasing moderate W wind at the Pass becoming light. Strong ridgeline winds in the evening.
Friday Partly cloudy in the morning with mostly clearing skies later in the day. Warming temperatures.
Thursday Night Light to moderate rain/snow showers and convergence heaviest during the early evening, then tapering to very light showers overnight. Decreasing moderate W wind at the Pass becoming light. Strong ridgeline winds in the evening.
Friday Partly cloudy in the morning with mostly clearing skies later in the day. Warming temperatures.
Thursday Night Light rain/snow showers in the evening then becoming mostly cloudy. Strong ridgeline wind gusts in the evening.
Friday Partly cloudy in the morning with mostly clearing skies later in the day. Warming temperatures.
Thursday Night Light rain/snow and convergence spillover mainly near the Cascade Crest, tapering overnight. Strong ridgeline winds through the evening hours.
Friday Scattered clouds in the morning with mostly clearing skies later in the day. Warming temperatures.
Thursday Night Light snow showers in the early evening give way to mostly cloudy skies. Strong ridgeline wind gusts in the evening.
Friday Scattered clouds in the morning with mostly clearing skies later in the day. Warming temperatures.
Thursday Night Decreasing light rain and snow showers. Strong ridgeline wind gusts in the evening.
Friday Scattered clouds in the morning with mostly clearing skies later in the day. Warming temperatures.

Precipitation (in)

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

Snow Level (ft)

Thursday Evening Thursday Night Friday Morning Friday Afternoon Friday Evening Friday Night Saturday Morning* Saturday Afternoon*
Olympics 3000' 4000' 7000' 9500' 10000' 10500' 10500' 11000'
West North 2500' 2500' 3000' 5500' 6500' 6500' 6500' 10000'
West Central 2500' 2500' 3500' 5500' 7000' 7000' 7000' 11000'
West South 3000' 2500' 4000' 7500' 8000' 8000' 8500' 11500'
Stevens Pass 3000' 2500' 3500' 5500' 7000' 7000' 7500' 10500'
Snoqualmie Pass 3000' 2500' 4000' 6000' 7500' 7000' 7500' 11000'
East North 3000' 3000' 3000' 4500' 6500' 6500' 7500' 10500'
East Central 3500' 3500' 5000' 7000' 7500' 7000' 7500' 10500'
East South 3500' 4000' 5500' 8500' 8000' 7500' 8500' 11500'
Mt. Hood 4000' 3500' 5500' 8500' 8500' 8500' 8500' 11500'
Olympics Elevation
Thursday Evening 3000'
Thursday Night 4000'
Friday Morning 7000'
Friday Afternoon 9500'
Friday Evening 10000'
Friday Night 10500'
Saturday Morning* 10500'
Saturday Afternoon* 11000'
West North Elevation
Thursday Evening 2500'
Thursday Night 2500'
Friday Morning 3000'
Friday Afternoon 5500'
Friday Evening 6500'
Friday Night 6500'
Saturday Morning* 6500'
Saturday Afternoon* 10000'
West Central Elevation
Thursday Evening 2500'
Thursday Night 2500'
Friday Morning 3500'
Friday Afternoon 5500'
Friday Evening 7000'
Friday Night 7000'
Saturday Morning* 7000'
Saturday Afternoon* 11000'
West South Elevation
Thursday Evening 3000'
Thursday Night 2500'
Friday Morning 4000'
Friday Afternoon 7500'
Friday Evening 8000'
Friday Night 8000'
Saturday Morning* 8500'
Saturday Afternoon* 11500'
Stevens Pass Elevation
Thursday Evening 3000'
Thursday Night 2500'
Friday Morning 3500'
Friday Afternoon 5500'
Friday Evening 7000'
Friday Night 7000'
Saturday Morning* 7500'
Saturday Afternoon* 10500'
Snoqualmie Pass Elevation
Thursday Evening 3000'
Thursday Night 2500'
Friday Morning 4000'
Friday Afternoon 6000'
Friday Evening 7500'
Friday Night 7000'
Saturday Morning* 7500'
Saturday Afternoon* 11000'
East North Elevation
Thursday Evening 3000'
Thursday Night 3000'
Friday Morning 3000'
Friday Afternoon 4500'
Friday Evening 6500'
Friday Night 6500'
Saturday Morning* 7500'
Saturday Afternoon* 10500'
East Central Elevation
Thursday Evening 3500'
Thursday Night 3500'
Friday Morning 5000'
Friday Afternoon 7000'
Friday Evening 7500'
Friday Night 7000'
Saturday Morning* 7500'
Saturday Afternoon* 10500'
East South Elevation
Thursday Evening 3500'
Thursday Night 4000'
Friday Morning 5500'
Friday Afternoon 8500'
Friday Evening 8000'
Friday Night 7500'
Saturday Morning* 8500'
Saturday Afternoon* 11500'
Mt. Hood Elevation
Thursday Evening 4000'
Thursday Night 3500'
Friday Morning 5500'
Friday Afternoon 8500'
Friday Evening 8500'
Friday Night 8500'
Saturday Morning* 8500'
Saturday Afternoon* 11500'

5000' Temperatures (°F)

Thursday Night Friday
Max / Min Max / Min
Olympics 27 / 20 36 / 21
West North 27 / 24 33 / 25
West Central 27 / 25 33 / 26
West South 28 / 26 37 / 27
Stevens Pass 28 / 26 33 / 27
Snoqualmie Pass 28 / 26 33 / 27
East North 27 / 24 34 / 25
East Central 27 / 25 36 / 26
East South 27 / 25 38 / 26
Mt. Hood 30 / 25 37 / 26
Olympics 5000' Temperature Forecast
(Max / Min)
Thursday Night 27 / 20
Friday 36 / 21
West North 5000' Temperature Forecast
(Max / Min)
Thursday Night 27 / 24
Friday 33 / 25
West Central 5000' Temperature Forecast
(Max / Min)
Thursday Night 27 / 25
Friday 33 / 26
West South 5000' Temperature Forecast
(Max / Min)
Thursday Night 28 / 26
Friday 37 / 27
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Thursday Night 28 / 26
Friday 33 / 27
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Thursday Night 28 / 26
Friday 33 / 27
East North 5000' Temperature Forecast
(Max / Min)
Thursday Night 27 / 24
Friday 34 / 25
East Central 5000' Temperature Forecast
(Max / Min)
Thursday Night 27 / 25
Friday 36 / 26
East South 5000' Temperature Forecast
(Max / Min)
Thursday Night 27 / 25
Friday 38 / 26
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Thursday Night 30 / 25
Friday 37 / 26

Ridgeline Winds (mph)

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

Extended Weather Synopsis

The high pressure remains the dominant weather feature with unseasonably mild temperatures continuing Saturday night and Sunday. However, a weak disturbance moving over the top of the ridge will reduce the strength of the ridge slightly, cooling temperatures slightly. The cooling will be felt more on Sunday night and Monday as the disturbance slides down the back side of the ridge. At this time, no precipitation is expected with this feature, but some cloud cover is likely.

Extended Snow Level (ft)

Saturday Night* Sunday Sunday Night Monday
West North 7000' 8000' 6000' 7000'
Snoqualmie Pass 7500' 9000' 7000' 8000'
Mt. Hood 9000' 11000' 9000' 9500'
West North Elevation
Saturday Night* 7000'
Sunday 8000'
Sunday Night 6000'
Monday 7000'
Snoqualmie Pass Elevation
Saturday Night* 7500'
Sunday 9000'
Sunday Night 7000'
Monday 8000'
Mt. Hood Elevation
Saturday Night* 9000'
Sunday 11000'
Sunday Night 9000'
Monday 9500'

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

Previous forecast from Jan 20, 2022

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