Issued: 7:02 AM PST Monday, February 1, 2021
by Dennis D'Amico

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

Weather Synopsis

The quasi-stationary frontal boundary that has been draped west of the Cascade crest since Saturday evening is still with us. A warm frontal feature lifting north along the boundary overnight and this morning have spread precipitation to all areas but the heaviest axis of moisture continues to pound the northwest Cascades including Mt Baker and the Olympic Mountains and to a lesser extent Crystal Mountain. These same areas will experience the strongest ridgeline winds. The same pattern will continue today with snow levels in the 4500-6000' across the forecast area. 

The parent surface low will finally head inland this evening with a secondary wave developing along the boundary in northern California. This should stretch the boundary with most of the precipitation focused on the north Cascades once again as it lifts NE late this evening.  A wind shift from S-SE to W-SW will take place around midnight behind the frontal boundary. Snow levels will slowly lower late tonight. 

Post-frontal showers will be with us tomorrow as the upper-level low drops south along the coast. Showers should fire up tomorrow afternoon as the air mass becomes more unstable in the 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
Monday Moderate to occasionally heavy rain and snow.
Monday Night Light to moderate rain and snow becoming light to occasionally moderate showers in the late evening.
Monday Heavy rain and snow. Ridgeline winds becoming strong in the afternoon.
Monday Night Heavy rain and snow becoming light to moderate showers after midnight. Strong ridgeline winds easing after midnight.
Monday Light to moderate rain and snow. Ridgeline winds becoming strong in the afternoon.
Monday Night Moderate rain and snow becoming light to moderate showers after midnight. Strong ridgeline winds.
Monday Light rain and snow, occasionally moderate Crystal Mt area. Moderate to strong ridgeline winds.
Monday Night Light to moderate rain and snow becoming light to moderate showers after midnight. Moderate to strong ridgeline winds.
Monday Cloudy with periods of light rain and snow. Light east winds at Pass level.
Monday Night Light rain and snow occasionally moderate in the late evening, then light showers after midnight. Light east winds at Pass level becoming westerly after midnight.
Monday Cloudy with periods of light rain and snow. Light east winds at Pass level.
Monday Night Light rain and snow occasionally moderate in the late evening, then light showers after midnight. Light east winds at Pass level becoming westerly after midnight.
Monday Light to occasionally moderate rain or snow this morning, then periods of light rain and snow this afternoon.
Monday Night Light to occasionally moderate rain or snow in the evening, then scattered light showers after midnight.
Monday Light to occasionally moderate rain or snow this morning, then periods of light rain and snow this afternoon.
Monday Night Light to occasionally moderate rain or snow in the evening, then scattered light showers after midnight.
Monday Light to occasionally moderate rain or snow early, then periods of light rain and snow by late morning.
Monday Night Light to occasionally moderate rain or snow early in the evening, then scattered light showers after midnight.
Monday Mostly cloudy with periods of light rain and snow.
Monday Night Light to occasionally moderate rain or snow early in the evening, then scattered light showers after midnight.

Issued: 7:02 AM PST Monday, February 1, 2021

Precipitation (in)

Monday Monday Night Tuesday
4 am - 4 pm 4 pm - 4 am 4 am - 4 pm
Hurricane Ridge 0.75 -1.00 0.25 - 0.50 LT 0.25
Mt Baker Ski Area 1.50 - 2.00 0.75 -1.00 0.25
Mt. Loop - Barlow Pass 0.50 - 0.75 0.50 0.25 - 0.50
Stevens Pass LT 0.10 LT 0.25 LT 0.25
Snoqualmie Pass LT 0.25 0.25 0.25
Crystal Mt 0.50 0.50 LT 0.25
Paradise 0.25 0.50 0.25 - 0.50
White Pass LT 0.25 0.25 LT 0.25
Washington Pass LT 0.25 LT 0.25 LT 0.10
Mission Ridge LT 0.25 LT 0.25 LT 0.10
Salmon la Sac - Gallagher Head LT 0.25 LT 0.25 LT 0.25
Tieton River - Darland Mt. LT 0.25 LT 0.25 LT 0.25
Mt Hood Meadows LT 0.25 LT 0.25 0.25
Timberline 0.25 0.25 0.25
Hurricane Ridge Precipitation (in)
Monday 0.75 -1.00
Monday Night 0.25 - 0.50
Tuesday LT 0.25
Mt Baker Ski Area Precipitation (in)
Monday 1.50 - 2.00
Monday Night 0.75 -1.00
Tuesday 0.25
Mt. Loop - Barlow Pass Precipitation (in)
Monday 0.50 - 0.75
Monday Night 0.50
Tuesday 0.25 - 0.50
Stevens Pass Precipitation (in)
Monday LT 0.10
Monday Night LT 0.25
Tuesday LT 0.25
Snoqualmie Pass Precipitation (in)
Monday LT 0.25
Monday Night 0.25
Tuesday 0.25
Crystal Mt Precipitation (in)
Monday 0.50
Monday Night 0.50
Tuesday LT 0.25
Paradise Precipitation (in)
Monday 0.25
Monday Night 0.50
Tuesday 0.25 - 0.50
White Pass Precipitation (in)
Monday LT 0.25
Monday Night 0.25
Tuesday LT 0.25
Washington Pass Precipitation (in)
Monday LT 0.25
Monday Night LT 0.25
Tuesday LT 0.10
Mission Ridge Precipitation (in)
Monday LT 0.25
Monday Night LT 0.25
Tuesday LT 0.10
Salmon la Sac - Gallagher Head Precipitation (in)
Monday LT 0.25
Monday Night LT 0.25
Tuesday LT 0.25
Tieton River - Darland Mt. Precipitation (in)
Monday LT 0.25
Monday Night LT 0.25
Tuesday LT 0.25
Mt Hood Meadows Precipitation (in)
Monday LT 0.25
Monday Night LT 0.25
Tuesday 0.25
Timberline Precipitation (in)
Monday 0.25
Monday Night 0.25
Tuesday 0.25

Issued: 7:02 AM PST Monday, February 1, 2021

Snow Level (ft)

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

Issued: 7:02 AM PST Monday, February 1, 2021

5000' Temperatures (°F)

Monday Monday Night
Max / Min Max / Min
Olympics 32 / 29 27 / 20
West North 31 / 30 29 / 20
West Central 32 / 31 31 / 24
West South 33 / 32 31 / 26
Stevens Pass 34 / 30 30 / 25
Snoqualmie Pass 32 / 31 30 / 25
East North 31 / 29 30 / 22
East Central 33 / 31 31 / 24
East South 33 / 30 31 / 26
Mt. Hood 34 / 32 33 / 27
Olympics 5000' Temperature Forecast
(Max / Min)
Monday 32 / 29
Monday Night 27 / 20
West North 5000' Temperature Forecast
(Max / Min)
Monday 31 / 30
Monday Night 29 / 20
West Central 5000' Temperature Forecast
(Max / Min)
Monday 32 / 31
Monday Night 31 / 24
West South 5000' Temperature Forecast
(Max / Min)
Monday 33 / 32
Monday Night 31 / 26
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Monday 34 / 30
Monday Night 30 / 25
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Monday 32 / 31
Monday Night 30 / 25
East North 5000' Temperature Forecast
(Max / Min)
Monday 31 / 29
Monday Night 30 / 22
East Central 5000' Temperature Forecast
(Max / Min)
Monday 33 / 31
Monday Night 31 / 24
East South 5000' Temperature Forecast
(Max / Min)
Monday 33 / 30
Monday Night 31 / 26
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Monday 34 / 32
Monday Night 33 / 27

Issued: 7:02 AM PST Monday, February 1, 2021

Ridgeline Winds (mph)

Monday Morning Monday Afternoon Monday Evening Monday Night
Olympics SSW 15-25 SSW 5-15 SW 10-20 SW 5-15
West North S 15-25 S 20-30 S 20-30 SW 10-20
West Central SSE 15-25 S 20-30 SSE 20-30 SW 15-25
West South SSE 20-30 SE 15-25 SSW 20-30 SW 10-20
Stevens Pass SE 5-15 SE 5-15 SE 10-20 WSW 10-20
Snoqualmie Pass SE 10-20 SE 10-20 SE 10-20 WSW 10-20
East North SSE 10-20 SSE 10-20 SSE 10-20 SW 15-25
East Central S 15-25 S 10-20 S 15-25 WSW 15-25
East South S 10-20 SSW 10-20 SSW 10-20 SW 15-25
Mt. Hood SSW 10-20 SSW 10-20 SW 15-25 SW 15-25
Olympics Ridgeline Winds (mph)
Monday Morning SSW 15-25
Monday Afternoon SSW 5-15
Monday Evening SW 10-20
Monday Night SW 5-15
West North Ridgeline Winds (mph)
Monday Morning S 15-25
Monday Afternoon S 20-30
Monday Evening S 20-30
Monday Night SW 10-20
West Central Ridgeline Winds (mph)
Monday Morning SSE 15-25
Monday Afternoon S 20-30
Monday Evening SSE 20-30
Monday Night SW 15-25
West South Ridgeline Winds (mph)
Monday Morning SSE 20-30
Monday Afternoon SE 15-25
Monday Evening SSW 20-30
Monday Night SW 10-20
Stevens Pass Ridgeline Winds (mph)
Monday Morning SE 5-15
Monday Afternoon SE 5-15
Monday Evening SE 10-20
Monday Night WSW 10-20
Snoqualmie Pass Ridgeline Winds (mph)
Monday Morning SE 10-20
Monday Afternoon SE 10-20
Monday Evening SE 10-20
Monday Night WSW 10-20
East North Ridgeline Winds (mph)
Monday Morning SSE 10-20
Monday Afternoon SSE 10-20
Monday Evening SSE 10-20
Monday Night SW 15-25
East Central Ridgeline Winds (mph)
Monday Morning S 15-25
Monday Afternoon S 10-20
Monday Evening S 15-25
Monday Night WSW 15-25
East South Ridgeline Winds (mph)
Monday Morning S 10-20
Monday Afternoon SSW 10-20
Monday Evening SSW 10-20
Monday Night SW 15-25
Mt. Hood Ridgeline Winds (mph)
Monday Morning SSW 10-20
Monday Afternoon SSW 10-20
Monday Evening SW 15-25
Monday Night SW 15-25

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

Previous forecast from Jan 31, 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’.