We're entering a wet and unseasonably mild stretch as a series of disturbances combine to bring an atmospheric river of moisture into the Washington Cascades and Olympics from Monday night through Wednesday.
Monday evening starts relatively dry with a few showers over the Olympics and the northern Cascades. A low pressure tracking just north of Vancouver Island should bring an associated shortwave trough over our region Monday night. Expect increasing rain and high elevation snow should spread throughout the mountains of Washington State overnight. Southwesterly ridgeline winds increase across the region but may be strong in the Olympics and Mt. Baker areas. Shallow cold air remaining E of the Cascade Crest continues to erode but sets the stage for freezing rain in some locations near and east of the Cascade Crest as snow levels should be above Snoqualmie Pass level.
The next wave of moisture takes a track slightly further south and should focus rain and high elevation snow most heavily on the southern Olympics and central Washington Cascades on Tuesday, but expect all of Washington's mountains to receive precipitation. Winds shift WSW and favor areas east of the Cascade Crest for strong ridgeline winds. Most of the low-elevation cold air east of the Cascades erodes by late Tuesday morning, except in the Methow Valley where freezing rain or snow may continue.
Heavy rain and increasingly high elevation snow continue Tuesday night in similar areas. The heaviest precipitation lifts northward as a third significant wave lifts the front draped over the region northward toward the Canadian border by the end of the day, decreasing and in some cases ending the rain from south to north. Snow levels peak in the 7000-9000 ft range Wednesday 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
Night
Increasing light rain and high elevation snow becoming moderate at times.
Tuesday
Light rain and high elevation snow becoming moderate in the afternoon.
Monday
Night
Light rain and high snow becoming moderate to occasionally heavy overnight.
Tuesday
Increasing light to moderate rain and snow.
Monday
Night
Light rain and high elevation snow becoming moderate overnight.
Tuesday
Heavy rain and high elevation snow.
Monday
Night
Increasing light rain and snow overnight becoming moderate at Paradise.
Tuesday
Moderate rain and high elevation snow at Paradise with light rain and high elevation snow elsewhere.
Monday
Night
Increasing light rain, snow, or possibly freezing rain. Increasing light E winds at the Pass.
Tuesday
Moderate rain, snow, and possibly freezing rain in the morning. Light E winds at the Pass.
Monday
Night
Increasing light rain or freezing rain. Light to moderate E winds at the Pass.
Tuesday
Moderate rain, snow and possibly freezing rain in the morning. Light E winds at the Pass.
Monday
Night
Increasing light snow.
Tuesday
Decreasing light to moderate rain, snow, and possibly freezing rain. Rising snow levels.
Monday
Night
Increasing light snow, freezing rain, or rain. Increasing ridgeline winds with strong gusts after midnight.
Tuesday
Light to moderate snow, freezing rain, or rain. Moderate to strong ridgeline winds peaking in the morning.
Monday
Night
A mostly dry evening with light snow or freezing rain overnight.
Tuesday
Light rain or high elevation snow (possibly mixed with freezing rain early).
Monday
Night
Very light rain or high elevation snow possible.
Tuesday
Light rain or high elevation snow at times.
Issued: 2:16 PM PST Monday, January 10, 2022
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
0.25 - 0.50
0.25 - 0.50
0.50
0.25 - 0.50
Mt Baker Ski Area
0.75 -1.00
0.50 - 0.75
1.00
1.00
Mt. Loop - Barlow Pass
0.50
1.50
1.50
0.75 -1.00
Stevens Pass
LT 0.25
1.00
1.00
0.25 - 0.50
Snoqualmie Pass
LT 0.25
1.00 - 1.50
1.00 - 1.50
0.25 - 0.50
Crystal Mt
LT 0.25
0.25
0.25
LT 0.25
Paradise
0.25
1.00 - 1.50
1.00
0.25
White Pass
LT 0.10
0.50
0.50
LT 0.10
Washington Pass
0.25
0.50
0.50 - 0.75
0.25 - 0.50
Mission Ridge
LT 0.10
LT 0.25
0.25
LT 0.10
Salmon la Sac - Gallagher Head
LT 0.25
0.75
0.75
0.25
Tieton River - Darland Mt.
LT 0.10
0.25 - 0.50
0.25
LT 0.10
Mt Hood Meadows
LT 0.10
LT 0.25
LT 0.10
0
Timberline
LT 0.10
LT 0.25
LT 0.10
0
Hurricane Ridge
Precipitation (in)
Monday Night
0.25 - 0.50
Tuesday
0.25 - 0.50
Tuesday Night
0.50
Wednesday
0.25 - 0.50
Mt Baker Ski Area
Precipitation (in)
Monday Night
0.75 -1.00
Tuesday
0.50 - 0.75
Tuesday Night
1.00
Wednesday
1.00
Mt. Loop - Barlow Pass
Precipitation (in)
Monday Night
0.50
Tuesday
1.50
Tuesday Night
1.50
Wednesday
0.75 -1.00
Stevens Pass
Precipitation (in)
Monday Night
LT 0.25
Tuesday
1.00
Tuesday Night
1.00
Wednesday
0.25 - 0.50
Snoqualmie Pass
Precipitation (in)
Monday Night
LT 0.25
Tuesday
1.00 - 1.50
Tuesday Night
1.00 - 1.50
Wednesday
0.25 - 0.50
Crystal Mt
Precipitation (in)
Monday Night
LT 0.25
Tuesday
0.25
Tuesday Night
0.25
Wednesday
LT 0.25
Paradise
Precipitation (in)
Monday Night
0.25
Tuesday
1.00 - 1.50
Tuesday Night
1.00
Wednesday
0.25
White Pass
Precipitation (in)
Monday Night
LT 0.10
Tuesday
0.50
Tuesday Night
0.50
Wednesday
LT 0.10
Washington Pass
Precipitation (in)
Monday Night
0.25
Tuesday
0.50
Tuesday Night
0.50 - 0.75
Wednesday
0.25 - 0.50
Mission Ridge
Precipitation (in)
Monday Night
LT 0.10
Tuesday
LT 0.25
Tuesday Night
0.25
Wednesday
LT 0.10
Salmon la Sac - Gallagher Head
Precipitation (in)
Monday Night
LT 0.25
Tuesday
0.75
Tuesday Night
0.75
Wednesday
0.25
Tieton River - Darland Mt.
Precipitation (in)
Monday Night
LT 0.10
Tuesday
0.25 - 0.50
Tuesday Night
0.25
Wednesday
LT 0.10
Mt Hood Meadows
Precipitation (in)
Monday Night
LT 0.10
Tuesday
LT 0.25
Tuesday Night
LT 0.10
Wednesday
0
Timberline
Precipitation (in)
Monday Night
LT 0.10
Tuesday
LT 0.25
Tuesday Night
LT 0.10
Wednesday
0
Issued: 2:16 PM PST Monday, January 10, 2022
Snow Level (ft)
Monday
Evening*
Monday
Night*
Tuesday
Morning*
Tuesday
Afternoon*
Tuesday
Evening*
Tuesday
Night*
Wednesday
Morning*
Wednesday
Afternoon*
Olympics
5500'
5500'
6000'
6000'
6000'
7000'
8000'
8000'
West North
4500'
5000'
5000'
5000'
5000'
4500'
5500'
7000'
West Central
5000'
5000'
5000'
5000'
5000'
5500'
6500'
7500'
West South
5500'
5500'
5500'
5500'
5500'
6000'
8000'
8000'
Stevens Pass
4000'
4000'
4000'
5000'
5000'
5500'
7000'
7500'
Snoqualmie Pass
4000'
4500'
4500'
5000'
5000'
6000'
7500'
7500'
East North
3500'
3000'
3000'
4000'
4500'
4500'
5000'
5500'
East Central
3000'
2500'
3500'
5000'
5000'
5000'
7000'
7000'
East South
5500'
6000'
6000'
5500'
5500'
6000'
8000'
8500'
Mt. Hood
6500'
6500'
6000'
6000'
6000'
7000'
8500'
9000'
Olympics
Elevation
Monday
Evening*
5500'
Monday
Night*
5500'
Tuesday
Morning*
6000'
Tuesday
Afternoon*
6000'
Tuesday
Evening*
6000'
Tuesday
Night*
7000'
Wednesday
Morning*
8000'
Wednesday
Afternoon*
8000'
West North
Elevation
Monday
Evening*
4500'
Monday
Night*
5000'
Tuesday
Morning*
5000'
Tuesday
Afternoon*
5000'
Tuesday
Evening*
5000'
Tuesday
Night*
4500'
Wednesday
Morning*
5500'
Wednesday
Afternoon*
7000'
West Central
Elevation
Monday
Evening*
5000'
Monday
Night*
5000'
Tuesday
Morning*
5000'
Tuesday
Afternoon*
5000'
Tuesday
Evening*
5000'
Tuesday
Night*
5500'
Wednesday
Morning*
6500'
Wednesday
Afternoon*
7500'
West South
Elevation
Monday
Evening*
5500'
Monday
Night*
5500'
Tuesday
Morning*
5500'
Tuesday
Afternoon*
5500'
Tuesday
Evening*
5500'
Tuesday
Night*
6000'
Wednesday
Morning*
8000'
Wednesday
Afternoon*
8000'
Stevens Pass
Elevation
Monday
Evening*
4000'
Monday
Night*
4000'
Tuesday
Morning*
4000'
Tuesday
Afternoon*
5000'
Tuesday
Evening*
5000'
Tuesday
Night*
5500'
Wednesday
Morning*
7000'
Wednesday
Afternoon*
7500'
Snoqualmie Pass
Elevation
Monday
Evening*
4000'
Monday
Night*
4500'
Tuesday
Morning*
4500'
Tuesday
Afternoon*
5000'
Tuesday
Evening*
5000'
Tuesday
Night*
6000'
Wednesday
Morning*
7500'
Wednesday
Afternoon*
7500'
East North
Elevation
Monday
Evening*
3500'
Monday
Night*
3000'
Tuesday
Morning*
3000'
Tuesday
Afternoon*
4000'
Tuesday
Evening*
4500'
Tuesday
Night*
4500'
Wednesday
Morning*
5000'
Wednesday
Afternoon*
5500'
East Central
Elevation
Monday
Evening*
3000'
Monday
Night*
2500'
Tuesday
Morning*
3500'
Tuesday
Afternoon*
5000'
Tuesday
Evening*
5000'
Tuesday
Night*
5000'
Wednesday
Morning*
7000'
Wednesday
Afternoon*
7000'
East South
Elevation
Monday
Evening*
5500'
Monday
Night*
6000'
Tuesday
Morning*
6000'
Tuesday
Afternoon*
5500'
Tuesday
Evening*
5500'
Tuesday
Night*
6000'
Wednesday
Morning*
8000'
Wednesday
Afternoon*
8500'
Mt. Hood
Elevation
Monday
Evening*
6500'
Monday
Night*
6500'
Tuesday
Morning*
6000'
Tuesday
Afternoon*
6000'
Tuesday
Evening*
6000'
Tuesday
Night*
7000'
Wednesday
Morning*
8500'
Wednesday
Afternoon*
9000'
Issued: 2:16 PM PST Monday, January 10, 2022
5000' Temperatures (°F)
Monday
Night
Tuesday
Max / Min
Max / Min
Olympics
35 / 32
35 / 33
West North
34 / 32
35 / 32
West Central
34 / 33
34 / 33
West South
35 / 33
35 / 34
Stevens Pass
34 / 30
34 / 33
Snoqualmie Pass
33 / 30
34 / 33
East North
32 / 27
34 / 31
East Central
34 / 29
34 / 33
East South
36 / 32
35 / 34
Mt. Hood
37 / 33
36 / 34
Olympics
5000' Temperature Forecast (Max / Min)
Monday
Night
35 / 32
Tuesday
35 / 33
West North
5000' Temperature Forecast (Max / Min)
Monday
Night
34 / 32
Tuesday
35 / 32
West Central
5000' Temperature Forecast (Max / Min)
Monday
Night
34 / 33
Tuesday
34 / 33
West South
5000' Temperature Forecast (Max / Min)
Monday
Night
35 / 33
Tuesday
35 / 34
Stevens Pass
5000' Temperature Forecast (Max / Min)
Monday
Night
34 / 30
Tuesday
34 / 33
Snoqualmie Pass
5000' Temperature Forecast (Max / Min)
Monday
Night
33 / 30
Tuesday
34 / 33
East North
5000' Temperature Forecast (Max / Min)
Monday
Night
32 / 27
Tuesday
34 / 31
East Central
5000' Temperature Forecast (Max / Min)
Monday
Night
34 / 29
Tuesday
34 / 33
East South
5000' Temperature Forecast (Max / Min)
Monday
Night
36 / 32
Tuesday
35 / 34
Mt. Hood
5000' Temperature Forecast (Max / Min)
Monday
Night
37 / 33
Tuesday
36 / 34
Issued: 2:16 PM PST Monday, January 10, 2022
Ridgeline Winds (mph)
Monday
Evening
Monday
Night
Tuesday
Morning
Tuesday
Afternoon
Olympics
SSW 25-35
SSW 30-40
SW 10-20
SSW 15-25
West North
SSW 15-25
SSW 30-40
SW 20-30
SSW 10-20
West Central
SSW 10-20
SSW 25-35
SW 20-30
SW 15-25
West South
SSW 10-20
SW 25-35
SW 20-30
SW 15-25
Stevens Pass
SW 10-20
SW 15-25
SW 15-25
SW 15-25
Snoqualmie Pass
SW 10-20
SSW 10-20
SW 20-30
SW 15-25
East North
WSW 15-25
SSW 20-30
SW 15-25
WSW 10-20
East Central
WSW 15-25
SW 20-30
WSW 30-40
WSW 20-30
East South
SW 10-20
SW 25-35
WSW 25-35
WSW 25-35
Mt. Hood
SW 15-25
SW 20-30
SW 25-35
WSW 25-35
Olympics
Ridgeline Winds (mph)
Monday
Evening
SSW
25-35
Monday
Night
SSW
30-40
Tuesday
Morning
SW
10-20
Tuesday
Afternoon
SSW
15-25
West North
Ridgeline Winds (mph)
Monday
Evening
SSW
15-25
Monday
Night
SSW
30-40
Tuesday
Morning
SW
20-30
Tuesday
Afternoon
SSW
10-20
West Central
Ridgeline Winds (mph)
Monday
Evening
SSW
10-20
Monday
Night
SSW
25-35
Tuesday
Morning
SW
20-30
Tuesday
Afternoon
SW
15-25
West South
Ridgeline Winds (mph)
Monday
Evening
SSW
10-20
Monday
Night
SW
25-35
Tuesday
Morning
SW
20-30
Tuesday
Afternoon
SW
15-25
Stevens Pass
Ridgeline Winds (mph)
Monday
Evening
SW
10-20
Monday
Night
SW
15-25
Tuesday
Morning
SW
15-25
Tuesday
Afternoon
SW
15-25
Snoqualmie Pass
Ridgeline Winds (mph)
Monday
Evening
SW
10-20
Monday
Night
SSW
10-20
Tuesday
Morning
SW
20-30
Tuesday
Afternoon
SW
15-25
East North
Ridgeline Winds (mph)
Monday
Evening
WSW
15-25
Monday
Night
SSW
20-30
Tuesday
Morning
SW
15-25
Tuesday
Afternoon
WSW
10-20
East Central
Ridgeline Winds (mph)
Monday
Evening
WSW
15-25
Monday
Night
SW
20-30
Tuesday
Morning
WSW
30-40
Tuesday
Afternoon
WSW
20-30
East South
Ridgeline Winds (mph)
Monday
Evening
SW
10-20
Monday
Night
SW
25-35
Tuesday
Morning
WSW
25-35
Tuesday
Afternoon
WSW
25-35
Mt. Hood
Ridgeline Winds (mph)
Monday
Evening
SW
15-25
Monday
Night
SW
20-30
Tuesday
Morning
SW
25-35
Tuesday
Afternoon
WSW
25-35
Issued: 2:16 PM PST Monday, January 10, 2022
Extended Weather Synopsis
The region partially dries out in the warm sector of the storm as the deluge shifts north into Canada Wednesday night. The dying trailing cold front moves through with some showers and cooling on Thursday. Thursday night a ridge returns to the region, bringing clearing skies. The high pressure lingers Friday with sunny conditions. A mild air mass returns west of the Cascade Crest with cooler air further east.
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).