Issued: 2:10 PM PST Wednesday, January 12, 2022
by Robert Hahn

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

Weather Synopsis

The northward lifting warm front exiting our region Wednesday afternoon should be north of the US-Canadian border by the evening. This leaves the region mostly dry in the warm sector of the storm under mostly cloudy skies with decreasing light to moderate SSW winds, and very mild. Temperatures should remain unseasonably mild with 5000 ft temperatures in the 35-40 degree range. The trailing offshore low takes its time approaching the mouth of the Columbia River overnight, spreading periods of light rain back into the region in the early morning hours. The associated trough should bring in cooler air particularly by Thursday morning, but particularly for the southern Washington Cascades and Mt. Hood on Thursday. Snow levels should be in the 4500-5500 ft range. Most area areas will see light rain and snow from late Wednesday night through mid-day Thursday, but rain and snow should continue throughout the day at Mt. Hood. Higher elevations on the southern Washington and Mt. Hood volcanoes may experience a brief period of stronger winds as an upper-level front passes with a wind shift.

A ridge of high pressure moves into the region Thursday night allowing skies to mostly clear (and valley fog to form). The ridge slides slightly east of the Cascades by Friday afternoon. This will allow freezing levels to rise significantly once again on Friday. Light E winds should keep cooler (but not cold) air east of the Cascade Crest and through the Passes. Mid and high-level clouds should increase across the region during 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
Wednesday Night Decreasing light rain showers in the evening, then increasing periods of rain after midnight. Strong ridgeline wind gusts possible after midnight.
Thursday Decreasing light rain and snow showers with sun breaks likely in the afternoon.
Wednesday Night Periods of light rain increasing in the early morning hours. Strong wind gusts possible.
Thursday Light rain and high elevation snow showers tapering to sprikles/flurries in the afternoon. Some sun breaks in the afternoon.
Wednesday Night Periods of light rain mainly after midnight.
Thursday Periods of light rain and high elevation snow in the morning, tapering to light sprinkles/flurries in the afternoon. Some sun breaks in the afternoon.
Wednesday Night Mostly cloudy in the evening with periods of light rain possible after midnight.
Thursday Moderate rain and high elevation snow in the morning at Paradise and Mt. St Helens; light at Crystal and White Pass. Becoming light everywhere in the afternoon. Some sun breaks in the afternoon.
Wednesday Night Cloudy with periods of light rain possible in the early morning hours. Light to occasionally moderate E wind at the Pass.
Thursday Light rain and high elevation snow tapering to a mix of sun breaks and sprinkles/flurries in the afternoon. Decreasing light E winds at the Pass.
Wednesday Night Cloudy with periods of light rain possible in the early morning hours. Light to moderate E wind at the Pass.
Thursday Light to moderate rain and high elevation snow tapering to a mix of sun breaks and sprinkles/flurries in the afternoon. Decreasing light E winds at the Pass.
Wednesday Night Very light rain or drizzle at times.
Thursday Very light rain and snow ending in the morning. Sun breaks are likely in the afternoon.
Wednesday Night Mostly cloudy with very light rain possible in the early morning hours.
Thursday Light rain and high elevation snow tapering off by around noon with some sun breaks in the afternoon.
Wednesday Night Mostly cloudy with very light rain possible in the early morning hours.
Thursday Light rain and high elevation snow ending by around noon with some sun breaks in the afternoon.
Wednesday Night Mostly cloudy with very light rain possible in the early morning hours.
Thursday Moderate rain and snow. Strong winds are possible late morning.

Precipitation (in)

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

Snow Level (ft)

Wednesday Evening* Wednesday Night* Thursday Morning* Thursday Afternoon Thursday Evening* Thursday Night* Friday Morning* Friday Afternoon*
Olympics 8000' 7000' 5500' 5000' 7000' 9500' 9500' 9500'
West North 7500' 7000' 5500' 5500' 6000' 5500' 5500' 7500'
West Central 8000' 7500' 5500' 5500' 5500' 6000' 6000' 8500'
West South 8500' 5500' 5000' 4500' 5500' 5000' 5000' 9000'
Stevens Pass 8500' 6500' 5000' 5500' 5500' 5500' 5500' 7000'
Snoqualmie Pass 8500' 6500' 5000' 5000' 5500' 5500' 5500' 8000'
East North 8000' 7500' 4500' 5500' 5500' 5000' 4500' 5000'
East Central 9000' 6500' 5000' 5500' 5500' 5000' 4500' 5500'
East South 9000' 5500' 5500' 4500' 5000' 4500' 4500' 8500'
Mt. Hood 10500' 8500' 6000' 4500' 4500' 7000' 8000' 11000'
Olympics Elevation
Wednesday Evening* 8000'
Wednesday Night* 7000'
Thursday Morning* 5500'
Thursday Afternoon 5000'
Thursday Evening* 7000'
Thursday Night* 9500'
Friday Morning* 9500'
Friday Afternoon* 9500'
West North Elevation
Wednesday Evening* 7500'
Wednesday Night* 7000'
Thursday Morning* 5500'
Thursday Afternoon 5500'
Thursday Evening* 6000'
Thursday Night* 5500'
Friday Morning* 5500'
Friday Afternoon* 7500'
West Central Elevation
Wednesday Evening* 8000'
Wednesday Night* 7500'
Thursday Morning* 5500'
Thursday Afternoon 5500'
Thursday Evening* 5500'
Thursday Night* 6000'
Friday Morning* 6000'
Friday Afternoon* 8500'
West South Elevation
Wednesday Evening* 8500'
Wednesday Night* 5500'
Thursday Morning* 5000'
Thursday Afternoon 4500'
Thursday Evening* 5500'
Thursday Night* 5000'
Friday Morning* 5000'
Friday Afternoon* 9000'
Stevens Pass Elevation
Wednesday Evening* 8500'
Wednesday Night* 6500'
Thursday Morning* 5000'
Thursday Afternoon 5500'
Thursday Evening* 5500'
Thursday Night* 5500'
Friday Morning* 5500'
Friday Afternoon* 7000'
Snoqualmie Pass Elevation
Wednesday Evening* 8500'
Wednesday Night* 6500'
Thursday Morning* 5000'
Thursday Afternoon 5000'
Thursday Evening* 5500'
Thursday Night* 5500'
Friday Morning* 5500'
Friday Afternoon* 8000'
East North Elevation
Wednesday Evening* 8000'
Wednesday Night* 7500'
Thursday Morning* 4500'
Thursday Afternoon 5500'
Thursday Evening* 5500'
Thursday Night* 5000'
Friday Morning* 4500'
Friday Afternoon* 5000'
East Central Elevation
Wednesday Evening* 9000'
Wednesday Night* 6500'
Thursday Morning* 5000'
Thursday Afternoon 5500'
Thursday Evening* 5500'
Thursday Night* 5000'
Friday Morning* 4500'
Friday Afternoon* 5500'
East South Elevation
Wednesday Evening* 9000'
Wednesday Night* 5500'
Thursday Morning* 5500'
Thursday Afternoon 4500'
Thursday Evening* 5000'
Thursday Night* 4500'
Friday Morning* 4500'
Friday Afternoon* 8500'
Mt. Hood Elevation
Wednesday Evening* 10500'
Wednesday Night* 8500'
Thursday Morning* 6000'
Thursday Afternoon 4500'
Thursday Evening* 4500'
Thursday Night* 7000'
Friday Morning* 8000'
Friday Afternoon* 11000'

5000' Temperatures (°F)

Wednesday Night Thursday
Max / Min Max / Min
Olympics 37 / 34 34 / 33
West North 37 / 32 34 / 30
West Central 36 / 29 34 / 29
West South 36 / 31 33 / 25
Stevens Pass 35 / 29 34 / 29
Snoqualmie Pass 36 / 27 34 / 28
East North 37 / 26 35 / 27
East Central 37 / 28 34 / 26
East South 38 / 31 33 / 27
Mt. Hood 40 / 34 36 / 31
Olympics 5000' Temperature Forecast
(Max / Min)
Wednesday Night 37 / 34
Thursday 34 / 33
West North 5000' Temperature Forecast
(Max / Min)
Wednesday Night 37 / 32
Thursday 34 / 30
West Central 5000' Temperature Forecast
(Max / Min)
Wednesday Night 36 / 29
Thursday 34 / 29
West South 5000' Temperature Forecast
(Max / Min)
Wednesday Night 36 / 31
Thursday 33 / 25
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Wednesday Night 35 / 29
Thursday 34 / 29
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Wednesday Night 36 / 27
Thursday 34 / 28
East North 5000' Temperature Forecast
(Max / Min)
Wednesday Night 37 / 26
Thursday 35 / 27
East Central 5000' Temperature Forecast
(Max / Min)
Wednesday Night 37 / 28
Thursday 34 / 26
East South 5000' Temperature Forecast
(Max / Min)
Wednesday Night 38 / 31
Thursday 33 / 27
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Wednesday Night 40 / 34
Thursday 36 / 31

Ridgeline Winds (mph)

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

Extended Weather Synopsis

The ridge gradually flattens Friday night and Saturday. The region remains mostly cloudy and a disturbance might bring some very light rain and snow to areas near the Canadian Border on Saturday. Further ridging builds into the region from offshore Saturday night and Sunday with sunshine increasingly likely in southern and eastern portions of our forecast region. Temperatures remain well above seasonal norms throughout the forecast period.

Extended Snow Level (ft)

Friday Night* Saturday Saturday Night Sunday *
West North 5000' 5000' 4500' 4000'
Snoqualmie Pass 5000' 4500' 5500' 5500'
Mt. Hood 8500' 7500' 9500' 9500'
West North Elevation
Friday Night* 5000'
Saturday 5000'
Saturday Night 4500'
Sunday * 4000'
Snoqualmie Pass Elevation
Friday Night* 5000'
Saturday 4500'
Saturday Night 5500'
Sunday * 5500'
Mt. Hood Elevation
Friday Night* 8500'
Saturday 7500'
Saturday Night 9500'
Sunday * 9500'

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

Previous forecast from Jan 12, 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