Issued: 2:27 PM PST Monday, November 27, 2023
by Dallas Glass

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

Weather Synopsis

Our stretch of sunny dry weather continues. A high-pressure ridge park on top of the Pacific Northwest continues to bring us clear skies and generally light winds. This shouldn't change much until much later in the week. 

A cut-off low-pressure system will slide south of the region Monday night and Tuesday. This will push our high a bit further east and cause it to weaken. While the effects won't be immediately noticeable, you'll start to see a subtle shift towards lower temperatures and passing high clouds. This will be the first step in a larger pattern change expected Thursday night. 

You can continue to expect temperature inversions to develop each evening. These will be most pronounced in the deeper mountain valleys, near the passes, and east of the Cascade crest. This could also result in low clouds and fog, in some of the more fog-prone locations. Temperature inversions should mix out mid to late morning Tuesday, but they could linger longer in the deeper valleys on the east side of the Cascades. 

This persistent pattern continues to repeat on Wednesday. 

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 Night Clear skies with temperature inversions developing in the mountain valleys.
Tuesday Sunny and mild. High clouds possible in the afternoon.
Monday Night Clear skies with temperature inversions developing in the mountain valleys.
Tuesday Sunny and mild. High clouds possible in the afternoon.
Monday Night Clear skies with temperature inversions in the mountain valleys.
Tuesday Sunny and mild. High clouds possible in the afternoon.
Monday Night Clear skies with temperature inversions in the mountain valleys and passes.
Tuesday Sunny, coldest in the valleys and near the crest. High clouds in the afternoon.
Monday Night Clear skies with temperature inversions. Low clouds and fog possible near and east of the Pass. Light easterly flow at pass level.
Tuesday Sunny, with low clouds and fog possible in the morning. High clouds in the afternoon. Light easterly flow at pass level.
Monday Night Clear skies with temperature inversions. Low clouds and fog possible near and east of the Pass. Light to moderate E winds at pass level.
Tuesday Sunny, with low clouds and fog in the morning. High clouds possible in the afternoon. Light E flow at pass level.
Monday Night Clear skies with temperature inversions. Low clouds and fog possible in the valleys.
Tuesday Sunny with low clouds and fog possible in the morning. High clouds possible in the afternoon.
Monday Night Clear skies with temperature inversions. Low clouds and fog possible in the valleys.
Tuesday Sunny with some low clouds/fog in the morning. High clouds possible in the afternoon.
Monday Night Clear skies with temperature inversions. Low clouds and fog possible in the valleys.
Tuesday Sunny with some low clouds/fog in the morning. High clouds possible in the afternoon.
Monday Night Clear skis multiple temperature inversions possible. A few low clouds and valley fog.
Tuesday Sunny with any fog clearing. High clouds possible in the afternoon.

Issued: 2:27 PM PST Monday, November 27, 2023

Precipitation (in)

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

Issued: 2:27 PM PST Monday, November 27, 2023

Snow Level (ft)

Monday Evening* Monday Night* Tuesday Morning* Tuesday Afternoon* Tuesday Evening Tuesday Night Wednesday Morning Wednesday Afternoon
Olympics 10000' 9000' 8000' 7500' 6500' 5000' 5000' 5000'
West North 6500' 5000' 6500' 7500' 4500' 3000' 4000' 4500'
West Central 6000' 5000' 6500' 7500' 4500' 3000' 4000' 4500'
West South 5500' 5000' 6000' 7500' 4500' 3000' 4500' 5500'
Stevens Pass 3000' 2000' 2500' 6500' 3000' 2000' 4000' 5000'
Snoqualmie Pass 3000' 2000' 2500' 7000' 3000' 2500' 4500' 5000'
East North 2000' 1000' 1000' 5000' 2000' 1000' 3000' 4000'
East Central 2000' 1000' 1000' 5000' 2000' 1500' 3500' 4000'
East South 3500' 2000' 2000' 6000' 3000' 2500' 3500' 5000'
Mt. Hood 5500' 3000' 3500' 7500' 3500' 3500' 4500' 5500'
Olympics Elevation
Monday Evening* 10000'
Monday Night* 9000'
Tuesday Morning* 8000'
Tuesday Afternoon* 7500'
Tuesday Evening 6500'
Tuesday Night 5000'
Wednesday Morning 5000'
Wednesday Afternoon 5000'
West North Elevation
Monday Evening* 6500'
Monday Night* 5000'
Tuesday Morning* 6500'
Tuesday Afternoon* 7500'
Tuesday Evening 4500'
Tuesday Night 3000'
Wednesday Morning 4000'
Wednesday Afternoon 4500'
West Central Elevation
Monday Evening* 6000'
Monday Night* 5000'
Tuesday Morning* 6500'
Tuesday Afternoon* 7500'
Tuesday Evening 4500'
Tuesday Night 3000'
Wednesday Morning 4000'
Wednesday Afternoon 4500'
West South Elevation
Monday Evening* 5500'
Monday Night* 5000'
Tuesday Morning* 6000'
Tuesday Afternoon* 7500'
Tuesday Evening 4500'
Tuesday Night 3000'
Wednesday Morning 4500'
Wednesday Afternoon 5500'
Stevens Pass Elevation
Monday Evening* 3000'
Monday Night* 2000'
Tuesday Morning* 2500'
Tuesday Afternoon* 6500'
Tuesday Evening 3000'
Tuesday Night 2000'
Wednesday Morning 4000'
Wednesday Afternoon 5000'
Snoqualmie Pass Elevation
Monday Evening* 3000'
Monday Night* 2000'
Tuesday Morning* 2500'
Tuesday Afternoon* 7000'
Tuesday Evening 3000'
Tuesday Night 2500'
Wednesday Morning 4500'
Wednesday Afternoon 5000'
East North Elevation
Monday Evening* 2000'
Monday Night* 1000'
Tuesday Morning* 1000'
Tuesday Afternoon* 5000'
Tuesday Evening 2000'
Tuesday Night 1000'
Wednesday Morning 3000'
Wednesday Afternoon 4000'
East Central Elevation
Monday Evening* 2000'
Monday Night* 1000'
Tuesday Morning* 1000'
Tuesday Afternoon* 5000'
Tuesday Evening 2000'
Tuesday Night 1500'
Wednesday Morning 3500'
Wednesday Afternoon 4000'
East South Elevation
Monday Evening* 3500'
Monday Night* 2000'
Tuesday Morning* 2000'
Tuesday Afternoon* 6000'
Tuesday Evening 3000'
Tuesday Night 2500'
Wednesday Morning 3500'
Wednesday Afternoon 5000'
Mt. Hood Elevation
Monday Evening* 5500'
Monday Night* 3000'
Tuesday Morning* 3500'
Tuesday Afternoon* 7500'
Tuesday Evening 3500'
Tuesday Night 3500'
Wednesday Morning 4500'
Wednesday Afternoon 5500'

Issued: 2:27 PM PST Monday, November 27, 2023

5000' Temperatures (°F)

Monday Night Tuesday
Max / Min Max / Min
Olympics 36 / 34 39 / 32
West North 42 / 22 43 / 21
West Central 41 / 31 43 / 20
West South 38 / 24 39 / 24
Stevens Pass 27 / 23 32 / 22
Snoqualmie Pass 31 / 24 35 / 24
East North 23 / 19 27 / 18
East Central 29 / 23 34 / 20
East South 29 / 25 34 / 24
Mt. Hood 33 / 28 36 / 26
Olympics 5000' Temperature Forecast
(Max / Min)
Monday Night 36 / 34
Tuesday 39 / 32
West North 5000' Temperature Forecast
(Max / Min)
Monday Night 42 / 22
Tuesday 43 / 21
West Central 5000' Temperature Forecast
(Max / Min)
Monday Night 41 / 31
Tuesday 43 / 20
West South 5000' Temperature Forecast
(Max / Min)
Monday Night 38 / 24
Tuesday 39 / 24
Stevens Pass 5000' Temperature Forecast
(Max / Min)
Monday Night 27 / 23
Tuesday 32 / 22
Snoqualmie Pass 5000' Temperature Forecast
(Max / Min)
Monday Night 31 / 24
Tuesday 35 / 24
East North 5000' Temperature Forecast
(Max / Min)
Monday Night 23 / 19
Tuesday 27 / 18
East Central 5000' Temperature Forecast
(Max / Min)
Monday Night 29 / 23
Tuesday 34 / 20
East South 5000' Temperature Forecast
(Max / Min)
Monday Night 29 / 25
Tuesday 34 / 24
Mt. Hood 5000' Temperature Forecast
(Max / Min)
Monday Night 33 / 28
Tuesday 36 / 26

Issued: 2:27 PM PST Monday, November 27, 2023

Ridgeline Winds (mph)

Monday Evening Monday Night Tuesday Morning Tuesday Afternoon
Olympics SW 0-10 SW 5-15 SW 5-15 W 5-15
West North SW 0-10 SW 5-15 SW 5-15 W 5-15
West Central SW 0-10 SW 5-15 SW 5-15 W 5-15
West South S 0-10 SW 5-15 SW 5-15 W 5-15
Stevens Pass SE 0-10 SW 5-15 SW 5-15 W 5-15
Snoqualmie Pass SE 0-10 SW 5-15 SW 5-15 W 5-15
East North W 5-15 SW 5-15 SW 5-15 W 5-15
East Central WSW 5-15 SW 5-15 SW 5-15 W 5-15
East South SW 5-15 SW 5-15 SW 5-15 W 5-15
Mt. Hood S 5-15 SSW 10-20 SSW 5-15 W 5-15
Olympics Ridgeline Winds (mph)
Monday Evening SW 0-10
Monday Night SW 5-15
Tuesday Morning SW 5-15
Tuesday Afternoon W 5-15
West North Ridgeline Winds (mph)
Monday Evening SW 0-10
Monday Night SW 5-15
Tuesday Morning SW 5-15
Tuesday Afternoon W 5-15
West Central Ridgeline Winds (mph)
Monday Evening SW 0-10
Monday Night SW 5-15
Tuesday Morning SW 5-15
Tuesday Afternoon W 5-15
West South Ridgeline Winds (mph)
Monday Evening S 0-10
Monday Night SW 5-15
Tuesday Morning SW 5-15
Tuesday Afternoon W 5-15
Stevens Pass Ridgeline Winds (mph)
Monday Evening SE 0-10
Monday Night SW 5-15
Tuesday Morning SW 5-15
Tuesday Afternoon W 5-15
Snoqualmie Pass Ridgeline Winds (mph)
Monday Evening SE 0-10
Monday Night SW 5-15
Tuesday Morning SW 5-15
Tuesday Afternoon W 5-15
East North Ridgeline Winds (mph)
Monday Evening W 5-15
Monday Night SW 5-15
Tuesday Morning SW 5-15
Tuesday Afternoon W 5-15
East Central Ridgeline Winds (mph)
Monday Evening WSW 5-15
Monday Night SW 5-15
Tuesday Morning SW 5-15
Tuesday Afternoon W 5-15
East South Ridgeline Winds (mph)
Monday Evening SW 5-15
Monday Night SW 5-15
Tuesday Morning SW 5-15
Tuesday Afternoon W 5-15
Mt. Hood Ridgeline Winds (mph)
Monday Evening S 5-15
Monday Night SSW 10-20
Tuesday Morning SSW 5-15
Tuesday Afternoon W 5-15

Issued: 2:27 PM PST Monday, November 27, 2023

Extended Weather Synopsis

All eyes are locked on the extended forecast. After more than a week of clear, dry weather, a significant pattern shift arrives Thursday night. The first storm appears weak and disorganized. A few showers could arrive at the coast during the day, before spreading into the rest of the region late in the afternoon and overnight. Right now, precipitation totals look meager. However, this is only the first in a series of storms lined up to parade across the area to kick off December. 

Extended Snow Level (ft)

Wednesday Night* Thursday * Thursday Night* Friday
West North 2500' 3500' 2500' 2500'
Snoqualmie Pass 2500' 3500' 2500' 3000'
Mt. Hood 2500' 4000' 2500' 3000'
West North Elevation
Wednesday Night* 2500'
Thursday * 3500'
Thursday Night* 2500'
Friday 2500'
Snoqualmie Pass Elevation
Wednesday Night* 2500'
Thursday * 3500'
Thursday Night* 2500'
Friday 3000'
Mt. Hood Elevation
Wednesday Night* 2500'
Thursday * 4000'
Thursday Night* 2500'
Friday 3000'

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

Previous forecast from Nov 26, 2023

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’.