A fair bit of stratocumulus remains trapped along the central Cascades near and west of the Cascade crest this afternoon with mountain temperatures largely in the mid-30s to mid-40s across the area. A weak Pacific frontal system will approach from the west tonight, spreading high clouds over the area. Light precipitation will start for the Olympics and northwest Cascades Monday morning and slowly spread inland during the day. Snow levels will fall to around 5000' with the onset of the light precipitation. Ridgeline winds will bump into the moderate range in the afternoon for the central/south Washington Cascades and Mt. Hood. Post-frontal showers will be light Monday night, but we may squeeze out a few inches of snow above 4500' for areas affected by a Puget Sound Convergence Zone.
Tuesday should be a dry day with rebounding temperatures as strong upper level ridging builds offshore. However, there will be plenty of left-over low level moisture/clouds Tuesday for areas near and west of the Cascade crest including the Olympics Mountains. More consistent and widepread sunshine can be found further east and down near Mt Hood.
This will be the last Mountain Weather Forecast of the 2020-2021 Season.Enjoy the Spring and Summer from all of us here at the Northwest Avalanche Center!
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
Sunday
Night
Mostly cloudy in the evening, becoming cloudy after midnight.
Monday
Cloudy with light rain and snow developing in the morning, then scattered light rain and snow showers in the afternoon.
Sunday
Night
Partly cloudy in the evening, becoming cloudy after midnight.
Monday
Cloudy with light to occasionally moderate rain and snow developing late morning, then scattered light rain and snow showers late in the afternoon.
Sunday
Night
Mostly cloudy in the evening, becoming cloudy after midnight.
Monday
Cloudy. Light to occasionally moderate rain and snow developing mid-day.
Sunday
Night
Partly cloudy in the evening, becoming mostly cloudy after midnight with increasing high clouds.
Monday
Partly cloudy in the morning, then cloudy with light rain and snow developing mid-day.
Sunday
Night
Partly cloudy in the evening, becoming cloudy after midnight with increasing high clouds.
Monday
Mostly cloudy in the morning, then cloudy with light rain and snow developing mid-day.
Sunday
Night
Partly cloudy in the evening, becoming cloudy after midnight with increasing high clouds.
Monday
Mostly cloudy in the morning, then cloudy with light rain and snow developing mid-day.
Sunday
Night
Partly cloudy in the evening, then mostly cloudy with increasing high clouds after midnight.
Monday
Mostly cloudy in the morning, then cloudy with light rain and snow developing mid-day.
Sunday
Night
Mostly clear in the evening, becoming partly cloudy after midnight with increasing high clouds.
Monday
Partly cloudy in the morning, then cloudy in the afternoon. Slight chance of rain or snow in the afternoon near the Cascade crest.
Sunday
Night
Mostly clear in the evening, becoming partly cloudy after midnight with increasing high clouds.
Monday
Partly cloudy in the morning, then cloudy in the afternoon. Slight chance of rain or snow in the afternoon near the Cascade crest.
Sunday
Night
Mostly clear in the evening, becoming partly cloudy after midnight with increasing high clouds.
Monday
Mostly sunny in the morning, then mostly cloudy in the afternoon. Chance of rain in the afternoon.
Issued: 2:25 PM PDT Sunday, May 2, 2021
Precipitation (in)
Sunday Night
Monday
Monday Night
Tuesday
5 pm - 5 am
5 am - 5 pm
5 pm - 5 am
5 am - 5 pm
Hurricane Ridge
0
LT 0.10
LT 0.10
0
Mt Baker Ski Area
0
LT 0.25
LT 0.10
0
Mt. Loop - Barlow Pass
0
LT 0.10
LT 0.10
0
Stevens Pass
0
LT 0.10
LT 0.10
0
Snoqualmie Pass
0
LT 0.10
LT 0.25
0
Crystal Mt
0
LT 0.10
LT 0.10
0
Paradise
0
LT 0.10
LT 0.10
0
White Pass
0
LT 0.10
LT 0.10
0
Washington Pass
0
LT 0.10
0
0
Mission Ridge
0
0
0
0
Salmon la Sac - Gallagher Head
0
0
LT 0.10
0
Tieton River - Darland Mt.
0
0
LT 0.10
0
Mt Hood Meadows
0
0
LT 0.10
0
Timberline
0
LT 0.10
LT 0.10
0
Hurricane Ridge
Precipitation (in)
Sunday Night
0
Monday
LT 0.10
Monday Night
LT 0.10
Tuesday
0
Mt Baker Ski Area
Precipitation (in)
Sunday Night
0
Monday
LT 0.25
Monday Night
LT 0.10
Tuesday
0
Mt. Loop - Barlow Pass
Precipitation (in)
Sunday Night
0
Monday
LT 0.10
Monday Night
LT 0.10
Tuesday
0
Stevens Pass
Precipitation (in)
Sunday Night
0
Monday
LT 0.10
Monday Night
LT 0.10
Tuesday
0
Snoqualmie Pass
Precipitation (in)
Sunday Night
0
Monday
LT 0.10
Monday Night
LT 0.25
Tuesday
0
Crystal Mt
Precipitation (in)
Sunday Night
0
Monday
LT 0.10
Monday Night
LT 0.10
Tuesday
0
Paradise
Precipitation (in)
Sunday Night
0
Monday
LT 0.10
Monday Night
LT 0.10
Tuesday
0
White Pass
Precipitation (in)
Sunday Night
0
Monday
LT 0.10
Monday Night
LT 0.10
Tuesday
0
Washington Pass
Precipitation (in)
Sunday Night
0
Monday
LT 0.10
Monday Night
0
Tuesday
0
Mission Ridge
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
0
Tuesday
0
Salmon la Sac - Gallagher Head
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
LT 0.10
Tuesday
0
Tieton River - Darland Mt.
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
LT 0.10
Tuesday
0
Mt Hood Meadows
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
LT 0.10
Tuesday
0
Timberline
Precipitation (in)
Sunday Night
0
Monday
LT 0.10
Monday Night
LT 0.10
Tuesday
0
Issued: 2:25 PM PDT Sunday, May 2, 2021
Snow Level (ft)
Sunday
Evening
Sunday
Night
Monday
Morning
Monday
Afternoon
Monday
Evening
Monday
Night
Tuesday
Morning
Tuesday
Afternoon
Olympics
5500'
5000'
5000'
5500'
5000'
4500'
5500'
6500'
West North
5500'
5000'
4500'
4500'
4500'
4500'
5000'
6000'
West Central
5500'
5000'
5000'
5000'
5000'
4500'
5500'
6500'
West South
5500'
5000'
5500'
5500'
5000'
4500'
5500'
7000'
Stevens Pass
5500'
5000'
5000'
5000'
5000'
4500'
5500'
6500'
Snoqualmie Pass
5500'
5000'
5000'
5000'
5000'
4500'
5500'
6500'
East North
5500'
5000'
5500'
5500'
5000'
4500'
5500'
7000'
East Central
6500'
6000'
6500'
5500'
5500'
4500'
6000'
7500'
East South
6500'
6000'
6500'
6000'
5500'
4500'
6000'
7500'
Mt. Hood
6500'
6000'
6500'
6000'
5500'
5000'
6000'
7500'
Olympics
Elevation
Sunday
Evening
5500'
Sunday
Night
5000'
Monday
Morning
5000'
Monday
Afternoon
5500'
Monday
Evening
5000'
Monday
Night
4500'
Tuesday
Morning
5500'
Tuesday
Afternoon
6500'
West North
Elevation
Sunday
Evening
5500'
Sunday
Night
5000'
Monday
Morning
4500'
Monday
Afternoon
4500'
Monday
Evening
4500'
Monday
Night
4500'
Tuesday
Morning
5000'
Tuesday
Afternoon
6000'
West Central
Elevation
Sunday
Evening
5500'
Sunday
Night
5000'
Monday
Morning
5000'
Monday
Afternoon
5000'
Monday
Evening
5000'
Monday
Night
4500'
Tuesday
Morning
5500'
Tuesday
Afternoon
6500'
West South
Elevation
Sunday
Evening
5500'
Sunday
Night
5000'
Monday
Morning
5500'
Monday
Afternoon
5500'
Monday
Evening
5000'
Monday
Night
4500'
Tuesday
Morning
5500'
Tuesday
Afternoon
7000'
Stevens Pass
Elevation
Sunday
Evening
5500'
Sunday
Night
5000'
Monday
Morning
5000'
Monday
Afternoon
5000'
Monday
Evening
5000'
Monday
Night
4500'
Tuesday
Morning
5500'
Tuesday
Afternoon
6500'
Snoqualmie Pass
Elevation
Sunday
Evening
5500'
Sunday
Night
5000'
Monday
Morning
5000'
Monday
Afternoon
5000'
Monday
Evening
5000'
Monday
Night
4500'
Tuesday
Morning
5500'
Tuesday
Afternoon
6500'
East North
Elevation
Sunday
Evening
5500'
Sunday
Night
5000'
Monday
Morning
5500'
Monday
Afternoon
5500'
Monday
Evening
5000'
Monday
Night
4500'
Tuesday
Morning
5500'
Tuesday
Afternoon
7000'
East Central
Elevation
Sunday
Evening
6500'
Sunday
Night
6000'
Monday
Morning
6500'
Monday
Afternoon
5500'
Monday
Evening
5500'
Monday
Night
4500'
Tuesday
Morning
6000'
Tuesday
Afternoon
7500'
East South
Elevation
Sunday
Evening
6500'
Sunday
Night
6000'
Monday
Morning
6500'
Monday
Afternoon
6000'
Monday
Evening
5500'
Monday
Night
4500'
Tuesday
Morning
6000'
Tuesday
Afternoon
7500'
Mt. Hood
Elevation
Sunday
Evening
6500'
Sunday
Night
6000'
Monday
Morning
6500'
Monday
Afternoon
6000'
Monday
Evening
5500'
Monday
Night
5000'
Tuesday
Morning
6000'
Tuesday
Afternoon
7500'
Issued: 2:25 PM PDT Sunday, May 2, 2021
5000' Temperatures (°F)
Sunday
Night
Monday
Max / Min
Max / Min
Olympics
36 / 32
37 / 32
West North
37 / 31
37 / 32
West Central
36 / 31
37 / 31
West South
39 / 30
38 / 30
Stevens Pass
39 / 30
38 / 30
Snoqualmie Pass
36 / 31
38 / 31
East North
41 / 30
39 / 32
East Central
40 / 31
39 / 31
East South
41 / 32
41 / 32
Mt. Hood
40 / 32
41 / 33
Olympics
5000' Temperature Forecast (Max / Min)
Sunday
Night
36 / 32
Monday
37 / 32
West North
5000' Temperature Forecast (Max / Min)
Sunday
Night
37 / 31
Monday
37 / 32
West Central
5000' Temperature Forecast (Max / Min)
Sunday
Night
36 / 31
Monday
37 / 31
West South
5000' Temperature Forecast (Max / Min)
Sunday
Night
39 / 30
Monday
38 / 30
Stevens Pass
5000' Temperature Forecast (Max / Min)
Sunday
Night
39 / 30
Monday
38 / 30
Snoqualmie Pass
5000' Temperature Forecast (Max / Min)
Sunday
Night
36 / 31
Monday
38 / 31
East North
5000' Temperature Forecast (Max / Min)
Sunday
Night
41 / 30
Monday
39 / 32
East Central
5000' Temperature Forecast (Max / Min)
Sunday
Night
40 / 31
Monday
39 / 31
East South
5000' Temperature Forecast (Max / Min)
Sunday
Night
41 / 32
Monday
41 / 32
Mt. Hood
5000' Temperature Forecast (Max / Min)
Sunday
Night
40 / 32
Monday
41 / 33
Issued: 2:25 PM PDT Sunday, May 2, 2021
Ridgeline Winds (mph)
Sunday
Evening
Sunday
Night
Monday
Morning
Monday
Afternoon
Olympics
SW 0-10
SW 5-15
WSW 10-20
W 5-15
West North
SW 0-10
SW 0-10
SW 5-15
SSW 10-20
West Central
W 0-10
W 0-10
W 5-15
W 10-20
West South
NW 0-10
W 5-15
W 5-15
WNW 15-25
Stevens Pass
WNW 5-15
W 5-15
WNW 5-15
W 10-20
Snoqualmie Pass
WNW 5-15
WNW 5-15
WNW 10-20
WNW 15-25
East North
WNW 5-15
SW 0-10
SW 5-15
W 10-20
East Central
WNW 5-15
W 5-15
W 10-20
WNW 15-25
East South
WNW 5-15
W 0-10
W 5-15
WNW 10-20
Mt. Hood
WSW 10-20
WNW 15-25
WNW 10-20
W 15-25
Olympics
Ridgeline Winds (mph)
Sunday
Evening
SW
0-10
Sunday
Night
SW
5-15
Monday
Morning
WSW
10-20
Monday
Afternoon
W
5-15
West North
Ridgeline Winds (mph)
Sunday
Evening
SW
0-10
Sunday
Night
SW
0-10
Monday
Morning
SW
5-15
Monday
Afternoon
SSW
10-20
West Central
Ridgeline Winds (mph)
Sunday
Evening
W
0-10
Sunday
Night
W
0-10
Monday
Morning
W
5-15
Monday
Afternoon
W
10-20
West South
Ridgeline Winds (mph)
Sunday
Evening
NW
0-10
Sunday
Night
W
5-15
Monday
Morning
W
5-15
Monday
Afternoon
WNW
15-25
Stevens Pass
Ridgeline Winds (mph)
Sunday
Evening
WNW
5-15
Sunday
Night
W
5-15
Monday
Morning
WNW
5-15
Monday
Afternoon
W
10-20
Snoqualmie Pass
Ridgeline Winds (mph)
Sunday
Evening
WNW
5-15
Sunday
Night
WNW
5-15
Monday
Morning
WNW
10-20
Monday
Afternoon
WNW
15-25
East North
Ridgeline Winds (mph)
Sunday
Evening
WNW
5-15
Sunday
Night
SW
0-10
Monday
Morning
SW
5-15
Monday
Afternoon
W
10-20
East Central
Ridgeline Winds (mph)
Sunday
Evening
WNW
5-15
Sunday
Night
W
5-15
Monday
Morning
W
10-20
Monday
Afternoon
WNW
15-25
East South
Ridgeline Winds (mph)
Sunday
Evening
WNW
5-15
Sunday
Night
W
0-10
Monday
Morning
W
5-15
Monday
Afternoon
WNW
10-20
Mt. Hood
Ridgeline Winds (mph)
Sunday
Evening
WSW
10-20
Sunday
Night
WNW
15-25
Monday
Morning
WNW
10-20
Monday
Afternoon
W
15-25
Issued: 2:25 PM PDT Sunday, May 2, 2021
Extended Weather Synopsis
The ridge amplifies further on Wednesday as it passes inland. This should be the warmest day this week with freezing levels around 9000' in the north and 12,000' ft in the south. High clouds may increase in the afternoon in advance of the next weather system.
After a warm Wednesday night, a developing frontal system off the Oregon coast swings northward during the day. While precipitation amounts do not look very impressive on Thursday, this system will open the door to cooler unsettled weather with potentially stronger weather systems late next week.
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).