A weak frontal system will bring some light precipitation to the area Monday evening, passing through the Cascades after midnight. The trailing upper level trough will help invigorate shower activity late Monday night through much of Tuesday and usher in colder air. The northwest Cascades including the Mt Baker area will be favored for more moderate precipitation at first, but after the trough's passage Tuesday morning, the flow will veer more WNW and shift the heavier precipitation into the central Cascades. A convergence zone is likely to waffle from the Snoqualmie Pass area to Barlow Pass for much of Tuesday and help rack up additional inches of snowfall above 2000-2500'. WNW ridgeline winds will be brisk in most areas on Tuesday. In total 4-12" seems likely along the west slopes of the Cascades and Mt Hood with 2-6" along the east slopes of the Cascades through Tuesday afternoon.
A shortwave ridge will move over the area Tuesday night and Wednesday, with showers winding down Tuesday night. Except for the far south Washington Cascades and Mt Hood, it looks unlikely we'll see much in the way of November sunshine on Wednesday before clouds from the next Pacific frontal system start moving inland.
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
Cloudy with periods of light rain and snow, becoming steady light rain and snow around midnight.
Tuesday
Mostly cloudy with scattered light rain and snow showers. Cooling trend.
Monday
Night
Periods of light rain and snow in the evening, becoming light to moderate after midnight.
Tuesday
Cloudy with light to occasionally moderate rain and snow showers in the morning. Mostly cloudy with scattered light rain and snow showers in the afternoon. Cooling trend.
Monday
Night
Cloudy with periods of light rain and snow in the evening, becoming light to moderate after midnight.
Tuesday
Light to occasionally moderate rain and snow showers in the morning, becoming mostly cloudy with scattered light snow showers in the afternoon. Windy. Cooling trend.
Monday
Night
Periods of light rain and snow in the evening, becoming light to moderate after late.
Tuesday
Light to occasionally moderate rain and snow showers in the morning, becoming mostly cloudy with scattered light snow showers in the afternoon. Windy. Cooling trend.
Monday
Night
Cloudy with periods of light rain and snow in the evening, becoming light to moderate after midnight.
Tuesday
Light to moderate rain and snow showers, becoming cloudy with scattered light to occasionally moderate snow showers in the afternoon. Windy. Cooling trend.
Monday
Night
Cloudy with periods of light rain and snow in the evening, becoming light to moderate after midnight.
Tuesday
Light to moderate rain and snow showers, becoming cloudy with scattered light to occasionally moderate snow showers in the afternoon. Windy. Cooling trend.
Monday
Night
Cloudy with periods of light rain and snow in the evening, becoming steadier light rain and snow after midnight.
Tuesday
Mostly cloudy with light rain and snow showers.
Monday
Night
Cloudy with periods of light rain and snow in the evening, becoming steadier light rain and snow late.
Tuesday
Mostly cloudy with light rain and snow showers, occasionally moderate showers near the Cascade crest. Windy. Cooling trend.
Monday
Night
Cloudy with periods of light rain and snow in the evening, becoming steadier light rain and snow late.
Tuesday
Mostly cloudy with light rain and snow showers, occasionally moderate showers near the Cascade crest in the morning. Windy. Cooling trend.
Monday
Night
Cloudy with periods of light rain and snow in the evening, becoming steadier light rain and snow late. Strong winds.
Tuesday
Cloudy with light to occasionally moderate rain and snow showers, heaviest west side of Mt Hood. Windy. Cooling trend.
Issued: 1:59 PM PST Monday, November 22, 2021
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
LT 0.25
LT 0.25
0
0
Mt Baker Ski Area
0.50
0.25
0
0
Mt. Loop - Barlow Pass
0.25 - 0.50
0.50
LT 0.10
0
Stevens Pass
0.25
0.25 - 0.50
LT 0.10
0
Snoqualmie Pass
0.25 - 0.50
0.50
LT 0.10
0
Crystal Mt
LT 0.25
0.25
LT 0.10
0
Paradise
0.25 - 0.50
0.25 - 0.50
0
0
White Pass
LT 0.25
0.25
0
0
Washington Pass
0.25
LT 0.10
0
0
Mission Ridge
LT 0.10
LT 0.10
0
0
Salmon la Sac - Gallagher Head
LT 0.25
0.25
LT 0.10
0
Tieton River - Darland Mt.
LT 0.10
LT 0.10
LT 0.10
0
Mt Hood Meadows
LT 0.10
0.50
LT 0.10
0
Timberline
LT 0.25
0.75
LT 0.25
0
Hurricane Ridge
Precipitation (in)
Monday Night
LT 0.25
Tuesday
LT 0.25
Tuesday Night
0
Wednesday
0
Mt Baker Ski Area
Precipitation (in)
Monday Night
0.50
Tuesday
0.25
Tuesday Night
0
Wednesday
0
Mt. Loop - Barlow Pass
Precipitation (in)
Monday Night
0.25 - 0.50
Tuesday
0.50
Tuesday Night
LT 0.10
Wednesday
0
Stevens Pass
Precipitation (in)
Monday Night
0.25
Tuesday
0.25 - 0.50
Tuesday Night
LT 0.10
Wednesday
0
Snoqualmie Pass
Precipitation (in)
Monday Night
0.25 - 0.50
Tuesday
0.50
Tuesday Night
LT 0.10
Wednesday
0
Crystal Mt
Precipitation (in)
Monday Night
LT 0.25
Tuesday
0.25
Tuesday Night
LT 0.10
Wednesday
0
Paradise
Precipitation (in)
Monday Night
0.25 - 0.50
Tuesday
0.25 - 0.50
Tuesday Night
0
Wednesday
0
White Pass
Precipitation (in)
Monday Night
LT 0.25
Tuesday
0.25
Tuesday Night
0
Wednesday
0
Washington Pass
Precipitation (in)
Monday Night
0.25
Tuesday
LT 0.10
Tuesday Night
0
Wednesday
0
Mission Ridge
Precipitation (in)
Monday Night
LT 0.10
Tuesday
LT 0.10
Tuesday Night
0
Wednesday
0
Salmon la Sac - Gallagher Head
Precipitation (in)
Monday Night
LT 0.25
Tuesday
0.25
Tuesday Night
LT 0.10
Wednesday
0
Tieton River - Darland Mt.
Precipitation (in)
Monday Night
LT 0.10
Tuesday
LT 0.10
Tuesday Night
LT 0.10
Wednesday
0
Mt Hood Meadows
Precipitation (in)
Monday Night
LT 0.10
Tuesday
0.50
Tuesday Night
LT 0.10
Wednesday
0
Timberline
Precipitation (in)
Monday Night
LT 0.25
Tuesday
0.75
Tuesday Night
LT 0.25
Wednesday
0
Issued: 1:59 PM PST Monday, November 22, 2021
Snow Level (ft)
Monday
Evening
Monday
Night
Tuesday
Morning
Tuesday
Afternoon
Tuesday
Evening
Tuesday
Night
Wednesday
Morning
Wednesday
Afternoon
Olympics
3500'
3500'
2500'
2000'
2000'
2000'
3000'
3500'
West North
3500'
3500'
2500'
2000'
2000'
2000'
2500'
3000'
West Central
3500'
3500'
2500'
2000'
2000'
2000'
2500'
3000'
West South
4000'
4000'
3000'
2500'
2000'
2000'
2500'
3500'
Stevens Pass
3500'
3500'
2500'
2000'
2000'
2000'
2500'
3000'
Snoqualmie Pass
3500'
3500'
2500'
2000'
2000'
2000'
2500'
3000'
East North
3500'
2500'
3000'
4000'
2000'
1500'
2500'
3000'
East Central
4500'
4000'
3500'
3500'
2500'
2000'
2500'
3000'
East South
5500'
4000'
3500'
3500'
2500'
2000'
3000'
3500'
Mt. Hood
6500'
4000'
3500'
3500'
2500'
2000'
3500'
4500'
Olympics
Elevation
Monday
Evening
3500'
Monday
Night
3500'
Tuesday
Morning
2500'
Tuesday
Afternoon
2000'
Tuesday
Evening
2000'
Tuesday
Night
2000'
Wednesday
Morning
3000'
Wednesday
Afternoon
3500'
West North
Elevation
Monday
Evening
3500'
Monday
Night
3500'
Tuesday
Morning
2500'
Tuesday
Afternoon
2000'
Tuesday
Evening
2000'
Tuesday
Night
2000'
Wednesday
Morning
2500'
Wednesday
Afternoon
3000'
West Central
Elevation
Monday
Evening
3500'
Monday
Night
3500'
Tuesday
Morning
2500'
Tuesday
Afternoon
2000'
Tuesday
Evening
2000'
Tuesday
Night
2000'
Wednesday
Morning
2500'
Wednesday
Afternoon
3000'
West South
Elevation
Monday
Evening
4000'
Monday
Night
4000'
Tuesday
Morning
3000'
Tuesday
Afternoon
2500'
Tuesday
Evening
2000'
Tuesday
Night
2000'
Wednesday
Morning
2500'
Wednesday
Afternoon
3500'
Stevens Pass
Elevation
Monday
Evening
3500'
Monday
Night
3500'
Tuesday
Morning
2500'
Tuesday
Afternoon
2000'
Tuesday
Evening
2000'
Tuesday
Night
2000'
Wednesday
Morning
2500'
Wednesday
Afternoon
3000'
Snoqualmie Pass
Elevation
Monday
Evening
3500'
Monday
Night
3500'
Tuesday
Morning
2500'
Tuesday
Afternoon
2000'
Tuesday
Evening
2000'
Tuesday
Night
2000'
Wednesday
Morning
2500'
Wednesday
Afternoon
3000'
East North
Elevation
Monday
Evening
3500'
Monday
Night
2500'
Tuesday
Morning
3000'
Tuesday
Afternoon
4000'
Tuesday
Evening
2000'
Tuesday
Night
1500'
Wednesday
Morning
2500'
Wednesday
Afternoon
3000'
East Central
Elevation
Monday
Evening
4500'
Monday
Night
4000'
Tuesday
Morning
3500'
Tuesday
Afternoon
3500'
Tuesday
Evening
2500'
Tuesday
Night
2000'
Wednesday
Morning
2500'
Wednesday
Afternoon
3000'
East South
Elevation
Monday
Evening
5500'
Monday
Night
4000'
Tuesday
Morning
3500'
Tuesday
Afternoon
3500'
Tuesday
Evening
2500'
Tuesday
Night
2000'
Wednesday
Morning
3000'
Wednesday
Afternoon
3500'
Mt. Hood
Elevation
Monday
Evening
6500'
Monday
Night
4000'
Tuesday
Morning
3500'
Tuesday
Afternoon
3500'
Tuesday
Evening
2500'
Tuesday
Night
2000'
Wednesday
Morning
3500'
Wednesday
Afternoon
4500'
Issued: 1:59 PM PST Monday, November 22, 2021
5000' Temperatures (°F)
Monday
Night
Tuesday
Max / Min
Max / Min
Olympics
33 / 27
30 / 22
West North
32 / 28
29 / 21
West Central
34 / 29
28 / 22
West South
36 / 31
31 / 24
Stevens Pass
35 / 29
30 / 23
Snoqualmie Pass
36 / 30
31 / 23
East North
32 / 26
31 / 19
East Central
37 / 31
32 / 23
East South
39 / 32
33 / 25
Mt. Hood
40 / 34
37 / 27
Olympics
5000' Temperature Forecast (Max / Min)
Monday
Night
33 / 27
Tuesday
30 / 22
West North
5000' Temperature Forecast (Max / Min)
Monday
Night
32 / 28
Tuesday
29 / 21
West Central
5000' Temperature Forecast (Max / Min)
Monday
Night
34 / 29
Tuesday
28 / 22
West South
5000' Temperature Forecast (Max / Min)
Monday
Night
36 / 31
Tuesday
31 / 24
Stevens Pass
5000' Temperature Forecast (Max / Min)
Monday
Night
35 / 29
Tuesday
30 / 23
Snoqualmie Pass
5000' Temperature Forecast (Max / Min)
Monday
Night
36 / 30
Tuesday
31 / 23
East North
5000' Temperature Forecast (Max / Min)
Monday
Night
32 / 26
Tuesday
31 / 19
East Central
5000' Temperature Forecast (Max / Min)
Monday
Night
37 / 31
Tuesday
32 / 23
East South
5000' Temperature Forecast (Max / Min)
Monday
Night
39 / 32
Tuesday
33 / 25
Mt. Hood
5000' Temperature Forecast (Max / Min)
Monday
Night
40 / 34
Tuesday
37 / 27
Issued: 1:59 PM PST Monday, November 22, 2021
Ridgeline Winds (mph)
Monday
Evening
Monday
Night
Tuesday
Morning
Tuesday
Afternoon
Olympics
SW 10-20
SW 5-15
W 10-20
WNW 10-20
West North
SW 15-25
SW 5-15
WSW 10-20
WSW 5-15
West Central
SW 10-20
SW 5-15
W 15-25
WNW 15-25
West South
SW 10-20
WSW 10-20
WSW 10-20
WNW 20-30
Stevens Pass
WSW 5-15
SW 5-15
W 15-25
WSW 15-25
Snoqualmie Pass
WSW 10-20
SW 10-20
W 15-25
WNW 20-30
East North
SW 15-25
W 10-20
W 10-20
W 10-20
East Central
WSW 10-20
WSW 10-20
W 20-30
W 25-35
East South
WSW 10-20
WSW 10-20
W 15-25
W 25-35
Mt. Hood
SW 15-25
WSW 20-30
W 25-35
WNW 30-40
Olympics
Ridgeline Winds (mph)
Monday
Evening
SW
10-20
Monday
Night
SW
5-15
Tuesday
Morning
W
10-20
Tuesday
Afternoon
WNW
10-20
West North
Ridgeline Winds (mph)
Monday
Evening
SW
15-25
Monday
Night
SW
5-15
Tuesday
Morning
WSW
10-20
Tuesday
Afternoon
WSW
5-15
West Central
Ridgeline Winds (mph)
Monday
Evening
SW
10-20
Monday
Night
SW
5-15
Tuesday
Morning
W
15-25
Tuesday
Afternoon
WNW
15-25
West South
Ridgeline Winds (mph)
Monday
Evening
SW
10-20
Monday
Night
WSW
10-20
Tuesday
Morning
WSW
10-20
Tuesday
Afternoon
WNW
20-30
Stevens Pass
Ridgeline Winds (mph)
Monday
Evening
WSW
5-15
Monday
Night
SW
5-15
Tuesday
Morning
W
15-25
Tuesday
Afternoon
WSW
15-25
Snoqualmie Pass
Ridgeline Winds (mph)
Monday
Evening
WSW
10-20
Monday
Night
SW
10-20
Tuesday
Morning
W
15-25
Tuesday
Afternoon
WNW
20-30
East North
Ridgeline Winds (mph)
Monday
Evening
SW
15-25
Monday
Night
W
10-20
Tuesday
Morning
W
10-20
Tuesday
Afternoon
W
10-20
East Central
Ridgeline Winds (mph)
Monday
Evening
WSW
10-20
Monday
Night
WSW
10-20
Tuesday
Morning
W
20-30
Tuesday
Afternoon
W
25-35
East South
Ridgeline Winds (mph)
Monday
Evening
WSW
10-20
Monday
Night
WSW
10-20
Tuesday
Morning
W
15-25
Tuesday
Afternoon
W
25-35
Mt. Hood
Ridgeline Winds (mph)
Monday
Evening
SW
15-25
Monday
Night
WSW
20-30
Tuesday
Morning
W
25-35
Tuesday
Afternoon
WNW
30-40
Issued: 1:59 PM PST Monday, November 22, 2021
Extended Weather Synopsis
A wet and increasingly warm pattern will take hold over the holiday weekend. Warm frontal moisture is forecast to move over the Olympics and north Washington Cascades late Wednesday night and shift southward during Thanksgiving. The heaviest precipitation should reach all areas Thursday night before turning to a lighter more showery pattern (but still mild) on Friday. We'll be on the south side of the jet stream for the duration of the event, with mild air working into the entire region eventually. While most areas will quickly transition to rain, significant snow could pile up in the northwest Cascades on Thanksgiving as snow levels rise during the day. The Washington Pass area and the northeast Cascades will likely see significant snowfall as well, with the warm-up delayed until Friday. Mild and wet weather looks likely to continue through the holiday weekend with little chance of snow accumulating at mid and lower elevations through the extended.
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).