We have a mix of sun and low clouds across the region this afternoon with mid-mountain temperatures generally in the 30s. A weak weather disturbance will traverse from west to east tonight spreading some high cover inland. A frontal system will approach the coast on Monday. This feature will increase offshore flow/easterly winds and start to drag low clouds along the east slopes of the Cascades towards the Cascade Passes. It will also spread thicker high clouds inland during the afternoon. We'll see a mild and mostly sunny start to 2024 along the Olympics, Mt Hood and the west slopes of the Cascades and for mid/upper slopes near the Cascade Passes and along the east slopes of the Cascades low clouds and cooler temperatures lower slopes and clear skies for upper slopes.
The system will weaken as it nears the coast Monday night and Tuesday, eventually shearing apart. We may see some light rain and snow glance the Olympics while light precipitation will struggle to reach the surface over the Cascades and Mt Hood where the mid levels are drier. Areas with low clouds will persist into Tuesday. E-SE winds will pick up Monday night and Tuesday, so look for breezy to locally windy conditions to develop as well. Temperatures will be cooler near and east of the Cascade crest during this period versus areas futher west.
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
Partly to mostly cloudy with high clouds.
Monday
Mostly sunny in the morning then becoming partly sunny with high clouds increasing in the afternoon.
Sunday
Night
Partly to mostly cloudy with high clouds.
Monday
Mostly sunny in the morning then becoming partly sunny with high clouds increasing in the afternoon. Moderate ridgeline winds in the afternoon.
Sunday
Night
Partly to mostly cloudy with high clouds.
Monday
Mostly sunny in the morning then becoming partly sunny with high clouds increasing in the afternoon. Moderate ridgeline winds in the afternoon.
Sunday
Night
Partly to mostly cloudy with high clouds. Areas of low clouds near White Pass.
Monday
Mostly sunny in the morning then becoming partly sunny with high clouds increasing in the afternoon. Areas of low clouds and cooler near White Pass. Moderate ridgeline winds in the afternoon.
Sunday
Night
Mostly cloudy with high clouds and areas of low clouds lower slopes near and east of the Pass. Light east winds at Pass level, variable and light winds at ridgeline.
Monday
Areas of low clouds near and east of the Pass, mostly sunny upper slopes. Light to moderate E Pass level and ridgeline winds developing in the afternoon.
Sunday
Night
Mostly cloudy with high clouds and areas of low clouds lower slopes near and east of the Pass. Light east winds at Pass level, variable and light winds at ridgeline.
Monday
Areas of low clouds near and east of the Pass, mostly sunny upper slopes. Moderate E Pass level and ridgeline winds developing in the afternoon.
Sunday
Night
Mostly cloudy with high clouds and areas of low clouds lower slopes and valleys.
Monday
Areas of low clouds lower slopes and valleys, mostly sunny upper slopes.
Sunday
Night
Mostly cloudy with high clouds and areas of low clouds lower slopes and valleys.
Monday
Areas of low clouds lower slopes and valleys, mostly sunny upper slopes.
Sunday
Night
Mostly cloudy with high clouds and areas of low clouds lower slopes and valleys.
Monday
Areas of low clouds lower slopes and valleys, mostly sunny upper slopes.
Sunday
Night
Partly to mostly cloudy with high clouds
Monday
Mostly sunny in the morning then becoming partly sunny with high clouds increasing in the afternoon.
Issued: 2:03 PM PST Sunday, December 31, 2023
Precipitation (in)
Sunday Night
Monday
Monday Night
Tuesday
4 pm - 4 am
4 am - 4 pm
4 pm - 4 am
4 am - 4 pm
Hurricane Ridge
0
0
0
LT 0.10
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)
Sunday Night
0
Monday
0
Monday Night
0
Tuesday
LT 0.10
Mt Baker Ski Area
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
0
Tuesday
0
Mt. Loop - Barlow Pass
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
0
Tuesday
0
Stevens Pass
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
0
Tuesday
0
Snoqualmie Pass
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
0
Tuesday
0
Crystal Mt
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
0
Tuesday
0
Paradise
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
0
Tuesday
0
White Pass
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
0
Tuesday
0
Washington Pass
Precipitation (in)
Sunday Night
0
Monday
0
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
0
Tuesday
0
Tieton River - Darland Mt.
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
0
Tuesday
0
Mt Hood Meadows
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
0
Tuesday
0
Timberline
Precipitation (in)
Sunday Night
0
Monday
0
Monday Night
0
Tuesday
0
Issued: 2:03 PM PST Sunday, December 31, 2023
Snow Level (ft)
Sunday
Evening
Sunday
Night*
Monday
Morning*
Monday
Afternoon*
Monday
Evening*
Monday
Night*
Tuesday
Morning*
Tuesday
Afternoon*
Olympics
4000'
3500'
4000'
5000'
5500'
6000'
6000'
5500'
West North
3500'
3000'
3500'
4500'
5000'
5500'
5500'
6000'
West Central
3500'
2500'
3500'
4500'
4500'
4500'
4500'
4500'
West South
3500'
2500'
3500'
4500'
4000'
3500'
3500'
4000'
Stevens Pass
3000'
2000'
2500'
3000'
2500'
2000'
2500'
3000'
Snoqualmie Pass
3000'
2500'
3000'
3500'
3000'
2500'
3000'
3500'
East North
2500'
1500'
2000'
3000'
2500'
1500'
2000'
3000'
East Central
2500'
1500'
2000'
3000'
2500'
1500'
2000'
3000'
East South
3500'
2000'
2500'
3500'
2500'
2000'
2500'
4000'
Mt. Hood
5000'
5000'
5500'
6000'
6000'
6000'
5500'
4500'
Olympics
Elevation
Sunday
Evening
4000'
Sunday
Night*
3500'
Monday
Morning*
4000'
Monday
Afternoon*
5000'
Monday
Evening*
5500'
Monday
Night*
6000'
Tuesday
Morning*
6000'
Tuesday
Afternoon*
5500'
West North
Elevation
Sunday
Evening
3500'
Sunday
Night*
3000'
Monday
Morning*
3500'
Monday
Afternoon*
4500'
Monday
Evening*
5000'
Monday
Night*
5500'
Tuesday
Morning*
5500'
Tuesday
Afternoon*
6000'
West Central
Elevation
Sunday
Evening
3500'
Sunday
Night*
2500'
Monday
Morning*
3500'
Monday
Afternoon*
4500'
Monday
Evening*
4500'
Monday
Night*
4500'
Tuesday
Morning*
4500'
Tuesday
Afternoon*
4500'
West South
Elevation
Sunday
Evening
3500'
Sunday
Night*
2500'
Monday
Morning*
3500'
Monday
Afternoon*
4500'
Monday
Evening*
4000'
Monday
Night*
3500'
Tuesday
Morning*
3500'
Tuesday
Afternoon*
4000'
Stevens Pass
Elevation
Sunday
Evening
3000'
Sunday
Night*
2000'
Monday
Morning*
2500'
Monday
Afternoon*
3000'
Monday
Evening*
2500'
Monday
Night*
2000'
Tuesday
Morning*
2500'
Tuesday
Afternoon*
3000'
Snoqualmie Pass
Elevation
Sunday
Evening
3000'
Sunday
Night*
2500'
Monday
Morning*
3000'
Monday
Afternoon*
3500'
Monday
Evening*
3000'
Monday
Night*
2500'
Tuesday
Morning*
3000'
Tuesday
Afternoon*
3500'
East North
Elevation
Sunday
Evening
2500'
Sunday
Night*
1500'
Monday
Morning*
2000'
Monday
Afternoon*
3000'
Monday
Evening*
2500'
Monday
Night*
1500'
Tuesday
Morning*
2000'
Tuesday
Afternoon*
3000'
East Central
Elevation
Sunday
Evening
2500'
Sunday
Night*
1500'
Monday
Morning*
2000'
Monday
Afternoon*
3000'
Monday
Evening*
2500'
Monday
Night*
1500'
Tuesday
Morning*
2000'
Tuesday
Afternoon*
3000'
East South
Elevation
Sunday
Evening
3500'
Sunday
Night*
2000'
Monday
Morning*
2500'
Monday
Afternoon*
3500'
Monday
Evening*
2500'
Monday
Night*
2000'
Tuesday
Morning*
2500'
Tuesday
Afternoon*
4000'
Mt. Hood
Elevation
Sunday
Evening
5000'
Sunday
Night*
5000'
Monday
Morning*
5500'
Monday
Afternoon*
6000'
Monday
Evening*
6000'
Monday
Night*
6000'
Tuesday
Morning*
5500'
Tuesday
Afternoon*
4500'
Issued: 2:03 PM PST Sunday, December 31, 2023
5000' Temperatures (°F)
Sunday
Night
Monday
Max / Min
Max / Min
Olympics
29 / 27
33 / 27
West North
28 / 26
32 / 27
West Central
28 / 26
33 / 27
West South
28 / 26
33 / 27
Stevens Pass
27 / 25
31 / 26
Snoqualmie Pass
28 / 26
31 / 27
East North
26 / 22
30 / 25
East Central
26 / 24
30 / 26
East South
27 / 25
33 / 26
Mt. Hood
32 / 29
37 / 31
Olympics
5000' Temperature Forecast (Max / Min)
Sunday
Night
29 / 27
Monday
33 / 27
West North
5000' Temperature Forecast (Max / Min)
Sunday
Night
28 / 26
Monday
32 / 27
West Central
5000' Temperature Forecast (Max / Min)
Sunday
Night
28 / 26
Monday
33 / 27
West South
5000' Temperature Forecast (Max / Min)
Sunday
Night
28 / 26
Monday
33 / 27
Stevens Pass
5000' Temperature Forecast (Max / Min)
Sunday
Night
27 / 25
Monday
31 / 26
Snoqualmie Pass
5000' Temperature Forecast (Max / Min)
Sunday
Night
28 / 26
Monday
31 / 27
East North
5000' Temperature Forecast (Max / Min)
Sunday
Night
26 / 22
Monday
30 / 25
East Central
5000' Temperature Forecast (Max / Min)
Sunday
Night
26 / 24
Monday
30 / 26
East South
5000' Temperature Forecast (Max / Min)
Sunday
Night
27 / 25
Monday
33 / 26
Mt. Hood
5000' Temperature Forecast (Max / Min)
Sunday
Night
32 / 29
Monday
37 / 31
Issued: 2:03 PM PST Sunday, December 31, 2023
Ridgeline Winds (mph)
Sunday
Evening
Sunday
Night
Monday
Morning
Monday
Afternoon
Olympics
S 0-10
S 0-10
S 5-15
S 10-20
West North
VAR 0-10
S 0-10
S 5-15
S 10-20
West Central
VAR 0-10
SW 0-10
S 0-10
S 5-15
West South
VAR 0-10
S 0-10
S 5-15
SSE 10-20
Stevens Pass
VAR 0-10
S 0-10
SSE 0-10
SSE 5-15
Snoqualmie Pass
WNW 0-10
S 0-10
SSE 5-15
SSE 10-20
East North
WSW 0-10
SW 0-10
S 0-10
S 5-15
East Central
WSW 0-10
SSW 5-15
SSW 0-10
S 5-15
East South
SW 0-10
SSW 0-10
SSW 0-10
S 5-15
Mt. Hood
SW 0-10
SW 5-15
SW 5-15
SSW 5-15
Olympics
Ridgeline Winds (mph)
Sunday
Evening
S
0-10
Sunday
Night
S
0-10
Monday
Morning
S
5-15
Monday
Afternoon
S
10-20
West North
Ridgeline Winds (mph)
Sunday
Evening
VAR
0-10
Sunday
Night
S
0-10
Monday
Morning
S
5-15
Monday
Afternoon
S
10-20
West Central
Ridgeline Winds (mph)
Sunday
Evening
VAR
0-10
Sunday
Night
SW
0-10
Monday
Morning
S
0-10
Monday
Afternoon
S
5-15
West South
Ridgeline Winds (mph)
Sunday
Evening
VAR
0-10
Sunday
Night
S
0-10
Monday
Morning
S
5-15
Monday
Afternoon
SSE
10-20
Stevens Pass
Ridgeline Winds (mph)
Sunday
Evening
VAR
0-10
Sunday
Night
S
0-10
Monday
Morning
SSE
0-10
Monday
Afternoon
SSE
5-15
Snoqualmie Pass
Ridgeline Winds (mph)
Sunday
Evening
WNW
0-10
Sunday
Night
S
0-10
Monday
Morning
SSE
5-15
Monday
Afternoon
SSE
10-20
East North
Ridgeline Winds (mph)
Sunday
Evening
WSW
0-10
Sunday
Night
SW
0-10
Monday
Morning
S
0-10
Monday
Afternoon
S
5-15
East Central
Ridgeline Winds (mph)
Sunday
Evening
WSW
0-10
Sunday
Night
SSW
5-15
Monday
Morning
SSW
0-10
Monday
Afternoon
S
5-15
East South
Ridgeline Winds (mph)
Sunday
Evening
SW
0-10
Sunday
Night
SSW
0-10
Monday
Morning
SSW
0-10
Monday
Afternoon
S
5-15
Mt. Hood
Ridgeline Winds (mph)
Sunday
Evening
SW
0-10
Sunday
Night
SW
5-15
Monday
Morning
SW
5-15
Monday
Afternoon
SSW
5-15
Issued: 2:03 PM PST Sunday, December 31, 2023
Extended Weather Synopsis
There's a chance we'll receive some light precipitation Tuesday night through Wednesday as the weak frontal system passes through. At the very least, offshore E-SE winds will decrease on Wednesday. An upper level ridge of high pressure will briefly build later Wednesday, before flattening on Thursday as another frontal system approaches. This should open the door to a more weather pattern although forecast models are in poor agreement on how the pattern evolves.
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).