An upper low that has brought precipitation to the region over the last 24 hours has moved into the Columbia Basin Saturday afternoon. Scattered shower activity should become isolated and limited to the west slopes of the Cascades in the evening hours as the daytime heating that initiates the convection wanes and the upper-level forcing retreats. Snow levels with these lingering showers should be in the 4000-5000 ft range with the lower snow levels in southern parts of the forecast region.
Expect mostly cloudy skies to linger overnight and into the morning hours with a weak high-pressure ridge trapping low-level moisture against the Cascades. Further east, skies should mostly clear. A sharp approaching trough should bring increased mid and high-level clouds to the region Sunday afternoon. Temperatures should be significantly milder with highs in the 40s and possibly even low 50s in the mountains.
A closed low ejects from the sharp trough as it moves near the mouth of the Columbia late Sunday night, spreading light rain and high elevation snow into western portions of the forecast region. The low tracks into northern Oregon Monday morning, bringing bands of light to moderate rain and snow to the region. SE winds over Washington state may favor areas of the east slopes of the Cascades. Snow levels drop to 4000-5000 ft for much of the precipitation on Monday and may be even slightly lower around Mt. Hood. Above the rain/snow line, many areas could receive 2-6" of moderate to high-density snow by Monday evening.
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
Saturday
Night
Mostly cloudy skies early, with mostly clear skies overnight.
Sunday
Partly cloudy in the morning, then becoming mostly cloudy with mid and high clouds in the afternoon. Mild.
Saturday
Night
Mostly cloudy skies early, with partial clearing and scattered clouds overnight.
Sunday
Partly cloudy in the morning, then becoming mostly cloudy with mid and high clouds in the afternoon. Mild.
Saturday
Night
Mostly cloudy skies early with isolated rain/snow showers in the early evening hours.
Sunday
Mostly cloudy in the morning with low clouds, then mid and high clouds arriving in the afternoon. Mild.
Saturday
Night
Mostly cloudy skies early with isolated rain/snow showers in the early evening hours.
Sunday
Mostly cloudy in the morning with low clouds, then mid and high clouds arriving in the afternoon. Mild.
Saturday
Night
Mostly cloudy skies early with isolated rain/snow showers in the early evening hours. Light W wind at the Pass.
Sunday
Mostly cloudy in the morning with low clouds, then mid and high clouds arriving in the afternoon. Mild. Light W wind at the Pass.
Saturday
Night
Mostly cloudy skies early with isolated rain/snow showers in the early evening hours. Light W wind at the Pass.
Sunday
Mostly cloudy in the morning with low clouds, then mid and high clouds arriving in the afternoon. Mild. Light W wind at the Pass.
Saturday
Night
Mostly cloudy skies early, with mostly clear skies overnight.
Sunday
Mostly sunny with high clouds arriving in the afternoon.
Saturday
Night
Mostly cloudy skies early, with mostly clear skies overnight.
Sunday
Mostly sunny with high clouds arriving in the afternoon.
Saturday
Night
Mostly cloudy skies early, with mostly clear skies overnight.
Sunday
Mostly sunny with high clouds arriving in the afternoon.
Saturday
Night
Mostly cloudy skies early with isolated rain/snow showers in the early evening hours.
Sunday
Partly cloudy with low clouds in the morning and high clouds in the afternoon.
Issued: 3:02 PM PDT Saturday, April 30, 2022
Precipitation (in)
Saturday Night
Sunday
Sunday Night
Monday
5 pm - 5 am
5 am - 5 pm
5 pm - 5 am
5 am - 5 pm
Hurricane Ridge
0
0
LT 0.10
LT 0.10
Mt Baker Ski Area
0
0
LT 0.10
0.25
Mt. Loop - Barlow Pass
LT 0.10
0
LT 0.10
0.25 - 0.50
Stevens Pass
0
0
LT 0.10
0.25 - 0.50
Snoqualmie Pass
LT 0.10
0
LT 0.10
0.25 - 0.50
Crystal Mt
LT 0.10
0
LT 0.10
0.25 - 0.50
Paradise
LT 0.10
0
LT 0.10
0.25 - 0.50
White Pass
LT 0.10
0
LT 0.10
0.25
Washington Pass
0
0
0
0.25
Mission Ridge
0
0
0
0.25 - 0.50
Salmon la Sac - Gallagher Head
0
0
0
0.25 - 0.50
Tieton River - Darland Mt.
0
0
0
0.25
Mt Hood Meadows
LT 0.10
0
LT 0.10
0.25
Timberline
LT 0.10
0
LT 0.10
0.25 - 0.50
Hurricane Ridge
Precipitation (in)
Saturday Night
0
Sunday
0
Sunday Night
LT 0.10
Monday
LT 0.10
Mt Baker Ski Area
Precipitation (in)
Saturday Night
0
Sunday
0
Sunday Night
LT 0.10
Monday
0.25
Mt. Loop - Barlow Pass
Precipitation (in)
Saturday Night
LT 0.10
Sunday
0
Sunday Night
LT 0.10
Monday
0.25 - 0.50
Stevens Pass
Precipitation (in)
Saturday Night
0
Sunday
0
Sunday Night
LT 0.10
Monday
0.25 - 0.50
Snoqualmie Pass
Precipitation (in)
Saturday Night
LT 0.10
Sunday
0
Sunday Night
LT 0.10
Monday
0.25 - 0.50
Crystal Mt
Precipitation (in)
Saturday Night
LT 0.10
Sunday
0
Sunday Night
LT 0.10
Monday
0.25 - 0.50
Paradise
Precipitation (in)
Saturday Night
LT 0.10
Sunday
0
Sunday Night
LT 0.10
Monday
0.25 - 0.50
White Pass
Precipitation (in)
Saturday Night
LT 0.10
Sunday
0
Sunday Night
LT 0.10
Monday
0.25
Washington Pass
Precipitation (in)
Saturday Night
0
Sunday
0
Sunday Night
0
Monday
0.25
Mission Ridge
Precipitation (in)
Saturday Night
0
Sunday
0
Sunday Night
0
Monday
0.25 - 0.50
Salmon la Sac - Gallagher Head
Precipitation (in)
Saturday Night
0
Sunday
0
Sunday Night
0
Monday
0.25 - 0.50
Tieton River - Darland Mt.
Precipitation (in)
Saturday Night
0
Sunday
0
Sunday Night
0
Monday
0.25
Mt Hood Meadows
Precipitation (in)
Saturday Night
LT 0.10
Sunday
0
Sunday Night
LT 0.10
Monday
0.25
Timberline
Precipitation (in)
Saturday Night
LT 0.10
Sunday
0
Sunday Night
LT 0.10
Monday
0.25 - 0.50
Issued: 3:02 PM PDT Saturday, April 30, 2022
Snow Level (ft)
Saturday
Evening
Saturday
Night
Sunday
Morning
Sunday
Afternoon
Sunday
Evening*
Sunday
Night*
Monday
Morning
Monday
Afternoon
Olympics
5500'
6000'
6000'
6500'
7000'
5500'
4000'
4000'
West North
6000'
6000'
5500'
6000'
7000'
6500'
5500'
4500'
West Central
5000'
5500'
5000'
6500'
8000'
7000'
5500'
4000'
West South
4500'
5000'
5000'
7000'
8000'
7000'
5000'
4000'
Stevens Pass
5000'
5500'
5000'
7000'
8000'
6500'
5500'
4000'
Snoqualmie Pass
5500'
5500'
5000'
6500'
8000'
7000'
5500'
4000'
East North
6000'
5500'
5000'
7000'
8000'
7000'
5500'
5000'
East Central
5500'
5500'
5500'
7000'
8000'
7500'
5500'
4500'
East South
5500'
5000'
5000'
7000'
8000'
8000'
5000'
4000'
Mt. Hood
4000'
5000'
5500'
7500'
9000'
7500'
4000'
3500'
Olympics
Elevation
Saturday
Evening
5500'
Saturday
Night
6000'
Sunday
Morning
6000'
Sunday
Afternoon
6500'
Sunday
Evening*
7000'
Sunday
Night*
5500'
Monday
Morning
4000'
Monday
Afternoon
4000'
West North
Elevation
Saturday
Evening
6000'
Saturday
Night
6000'
Sunday
Morning
5500'
Sunday
Afternoon
6000'
Sunday
Evening*
7000'
Sunday
Night*
6500'
Monday
Morning
5500'
Monday
Afternoon
4500'
West Central
Elevation
Saturday
Evening
5000'
Saturday
Night
5500'
Sunday
Morning
5000'
Sunday
Afternoon
6500'
Sunday
Evening*
8000'
Sunday
Night*
7000'
Monday
Morning
5500'
Monday
Afternoon
4000'
West South
Elevation
Saturday
Evening
4500'
Saturday
Night
5000'
Sunday
Morning
5000'
Sunday
Afternoon
7000'
Sunday
Evening*
8000'
Sunday
Night*
7000'
Monday
Morning
5000'
Monday
Afternoon
4000'
Stevens Pass
Elevation
Saturday
Evening
5000'
Saturday
Night
5500'
Sunday
Morning
5000'
Sunday
Afternoon
7000'
Sunday
Evening*
8000'
Sunday
Night*
6500'
Monday
Morning
5500'
Monday
Afternoon
4000'
Snoqualmie Pass
Elevation
Saturday
Evening
5500'
Saturday
Night
5500'
Sunday
Morning
5000'
Sunday
Afternoon
6500'
Sunday
Evening*
8000'
Sunday
Night*
7000'
Monday
Morning
5500'
Monday
Afternoon
4000'
East North
Elevation
Saturday
Evening
6000'
Saturday
Night
5500'
Sunday
Morning
5000'
Sunday
Afternoon
7000'
Sunday
Evening*
8000'
Sunday
Night*
7000'
Monday
Morning
5500'
Monday
Afternoon
5000'
East Central
Elevation
Saturday
Evening
5500'
Saturday
Night
5500'
Sunday
Morning
5500'
Sunday
Afternoon
7000'
Sunday
Evening*
8000'
Sunday
Night*
7500'
Monday
Morning
5500'
Monday
Afternoon
4500'
East South
Elevation
Saturday
Evening
5500'
Saturday
Night
5000'
Sunday
Morning
5000'
Sunday
Afternoon
7000'
Sunday
Evening*
8000'
Sunday
Night*
8000'
Monday
Morning
5000'
Monday
Afternoon
4000'
Mt. Hood
Elevation
Saturday
Evening
4000'
Saturday
Night
5000'
Sunday
Morning
5500'
Sunday
Afternoon
7500'
Sunday
Evening*
9000'
Sunday
Night*
7500'
Monday
Morning
4000'
Monday
Afternoon
3500'
Issued: 3:02 PM PDT Saturday, April 30, 2022
5000' Temperatures (°F)
Saturday
Night
Sunday
Max / Min
Max / Min
Olympics
34 / 29
41 / 29
West North
37 / 31
41 / 30
West Central
36 / 31
41 / 30
West South
34 / 28
46 / 28
Stevens Pass
38 / 31
45 / 29
Snoqualmie Pass
35 / 29
43 / 28
East North
39 / 32
46 / 32
East Central
37 / 31
47 / 31
East South
35 / 29
48 / 30
Mt. Hood
35 / 29
49 / 29
Olympics
5000' Temperature Forecast (Max / Min)
Saturday
Night
34 / 29
Sunday
41 / 29
West North
5000' Temperature Forecast (Max / Min)
Saturday
Night
37 / 31
Sunday
41 / 30
West Central
5000' Temperature Forecast (Max / Min)
Saturday
Night
36 / 31
Sunday
41 / 30
West South
5000' Temperature Forecast (Max / Min)
Saturday
Night
34 / 28
Sunday
46 / 28
Stevens Pass
5000' Temperature Forecast (Max / Min)
Saturday
Night
38 / 31
Sunday
45 / 29
Snoqualmie Pass
5000' Temperature Forecast (Max / Min)
Saturday
Night
35 / 29
Sunday
43 / 28
East North
5000' Temperature Forecast (Max / Min)
Saturday
Night
39 / 32
Sunday
46 / 32
East Central
5000' Temperature Forecast (Max / Min)
Saturday
Night
37 / 31
Sunday
47 / 31
East South
5000' Temperature Forecast (Max / Min)
Saturday
Night
35 / 29
Sunday
48 / 30
Mt. Hood
5000' Temperature Forecast (Max / Min)
Saturday
Night
35 / 29
Sunday
49 / 29
Issued: 3:02 PM PDT Saturday, April 30, 2022
Ridgeline Winds (mph)
Saturday
Evening
Saturday
Night
Sunday
Morning
Sunday
Afternoon
Olympics
W 0-10
SW 0-10
SW 0-10
SW 5-15
West North
NNW 0-10
NW 0-10
WSW 0-10
SSW 0-10
West Central
NW 0-10
NW 0-10
NW 0-10
WSW 0-10
West South
NW 0-10
NW 0-10
NW 0-10
SW 0-10
Stevens Pass
WNW 0-10
NW 5-15
WNW 0-10
W 0-10
Snoqualmie Pass
NW 5-15
NNW 5-15
NNW 5-15
WNW 5-15
East North
NNW 0-10
NNW 5-15
NW 0-10
W 0-10
East Central
N 5-15
NW 5-15
NW 0-10
WNW 0-10
East South
NNW 5-15
NNW 5-15
N 0-10
WSW 0-10
Mt. Hood
NW 5-15
NNW 5-15
NE 0-10
SE 0-10
Olympics
Ridgeline Winds (mph)
Saturday
Evening
W
0-10
Saturday
Night
SW
0-10
Sunday
Morning
SW
0-10
Sunday
Afternoon
SW
5-15
West North
Ridgeline Winds (mph)
Saturday
Evening
NNW
0-10
Saturday
Night
NW
0-10
Sunday
Morning
WSW
0-10
Sunday
Afternoon
SSW
0-10
West Central
Ridgeline Winds (mph)
Saturday
Evening
NW
0-10
Saturday
Night
NW
0-10
Sunday
Morning
NW
0-10
Sunday
Afternoon
WSW
0-10
West South
Ridgeline Winds (mph)
Saturday
Evening
NW
0-10
Saturday
Night
NW
0-10
Sunday
Morning
NW
0-10
Sunday
Afternoon
SW
0-10
Stevens Pass
Ridgeline Winds (mph)
Saturday
Evening
WNW
0-10
Saturday
Night
NW
5-15
Sunday
Morning
WNW
0-10
Sunday
Afternoon
W
0-10
Snoqualmie Pass
Ridgeline Winds (mph)
Saturday
Evening
NW
5-15
Saturday
Night
NNW
5-15
Sunday
Morning
NNW
5-15
Sunday
Afternoon
WNW
5-15
East North
Ridgeline Winds (mph)
Saturday
Evening
NNW
0-10
Saturday
Night
NNW
5-15
Sunday
Morning
NW
0-10
Sunday
Afternoon
W
0-10
East Central
Ridgeline Winds (mph)
Saturday
Evening
N
5-15
Saturday
Night
NW
5-15
Sunday
Morning
NW
0-10
Sunday
Afternoon
WNW
0-10
East South
Ridgeline Winds (mph)
Saturday
Evening
NNW
5-15
Saturday
Night
NNW
5-15
Sunday
Morning
N
0-10
Sunday
Afternoon
WSW
0-10
Mt. Hood
Ridgeline Winds (mph)
Saturday
Evening
NW
5-15
Saturday
Night
NNW
5-15
Sunday
Morning
NE
0-10
Sunday
Afternoon
SE
0-10
Issued: 3:02 PM PDT Saturday, April 30, 2022
Extended Weather Synopsis
The closed low exits Monday evening with a few light light rain/snow showers lingering with northerly flow aloft. Clouds with a slight chance of showers linger for the west slopes of the Cascades on Tuesday as a front passes to our north. Ridging moves in Tuesday night and Wednesday for milder weather. Southern parts of the forecast area around Mt. Hood could experience 10,000 ft freezing levels while northern regions will remain significantly cooler and cloudier with a frontal system north of the Canadian border.
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).