Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Sunday & Friday
A compact and moisture-starved low moved quickly to the south of the forecast area on Sunday morning and now sits over west-central Oregon, having bypassed the Pacific Northwest of almost any moisture. As the low continues to track S-SE, mostly sunny skies and light northly flow predominate over the forecast area. There are a few notable exceptions such as at Hurricane Ridge where the northerly flow is backing clouds against the mountains, but the clouds should dissipate by the late afternoon hours. Clouds also still linger around Mt. Hood on Sunday afternoon and evening.
The large offshore high pressure re-builds south of Alaska on Sunday.
Sunday night the lower-level flow will switch to easterly, allowing colder area to infiltrate western Washington from the east side of the Cascades and BC coast range. Northerly flow continues aloft.
On Monday, the offshore high pressure tilts into British Columbia, keeping the sunny weather in place and with moderating temperatures over the Pacific Northwest. Light or calm winds are expected.
On Monday night, the high slides southward over the region, bringing further moderation aloft, with a good inversion likely to set up, particularly on the east slopes of the Cascades. Light or calm winds are expected.
Weather Forecast
Olympics
| Sunday | Decreasing afternoon clouds as low-level clouds banked up against the northern part of the Olympics dissipate. |
| Sunday Night | Clear. |
| Monday | Sunny. Moderating temperatures. |
| Monday Night | Clear. Further gradual warming. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Sunday | Low-level clouds banked up against the west slopes of the Cascades from the central Cascades southward. Sunny in the north or above about 6000 ft. Fog in places. |
| Sunday Night | Clear. Cold. |
| Monday | Sunny. Moderating temperatures. |
| Monday Night | Clear. Further moderating temperatures aloft. |
East Slopes of the Washington Cascades
| Sunday | Mostly sunny with some high clouds in the south near Mt. Adams. |
| Sunday Night | Clear and cold. |
| Monday | Sunny and cool. Temperatures moderating in the afternoon. |
| Monday Night | Clear. Inversion conditions anticipated. |
Mt. Hood
| Sunday | Mostly cloudy with fog. |
| Sunday Night | Chance of a passing light snow shower in the early evening. Clearing during the late evening hours. Light to moderate E or NE wind. |
| Monday | Sunny. Cold in the morning with a light to moderate E wind. Moderating temperatures. |
| Monday Night | Clear. Warming. |
Issued: 2:28 PM PST Sunday, February 11, 2018
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Sunday Afternoon | Snow Level * | 1000' | 1000' | 1000' | ' | ' | 2000' | ' | 2000' |
| Sunday Night | Snow Level * | 0' | 0' | 0' | ' | ' | 0' | ' | 0' |
| Monday Morning | Freezing Level * | 2000' | 1000' | 1000' | ' | ' | 1000' | ' | 1000' |
| Monday Afternoon | Freezing Level | 3000' | 2500' | 3000' | ' | ' | 3000' | ' | 2000' |
| Monday Night | Freezing Level | 2500' | 2000' | 3000' | ' | ' | 3000' | ' | 5000' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 1000' (Easterly Flow *) |
| Sunday Night |
Snow Level 0' (Easterly Flow *) |
| Monday Morning |
Freezing Level 2000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 3000' |
| Monday Night |
Freezing Level 2500' |
| Mt. Baker | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 1000' (Easterly Flow *) |
| Sunday Night |
Snow Level 0' (Easterly Flow *) |
| Monday Morning |
Freezing Level 1000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 2500' |
| Monday Night |
Freezing Level 2000' |
| Washington Pass | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 1000' (Easterly Flow *) |
| Sunday Night |
Snow Level 0' (Easterly Flow *) |
| Monday Morning |
Freezing Level 1000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 3000' |
| Monday Night |
Freezing Level 3000' |
| Leavenworth | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level ' (Easterly Flow *) |
| Sunday Night |
Snow Level ' (Easterly Flow *) |
| Monday Morning |
Freezing Level ' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level ' |
| Monday Night |
Freezing Level ' |
| Stevens Pass | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level ' (Easterly Flow *) |
| Sunday Night |
Snow Level ' (Easterly Flow *) |
| Monday Morning |
Freezing Level ' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level ' |
| Monday Night |
Freezing Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 2000' (Easterly Flow *) |
| Sunday Night |
Snow Level 0' (Easterly Flow *) |
| Monday Morning |
Freezing Level 1000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 3000' |
| Monday Night |
Freezing Level 3000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level ' (Easterly Flow *) |
| Sunday Night |
Snow Level ' (Easterly Flow *) |
| Monday Morning |
Freezing Level ' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level ' |
| Monday Night |
Freezing Level ' |
| Mt. Hood | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 2000' (Easterly Flow *) |
| Sunday Night |
Snow Level 0' (Easterly Flow *) |
| Monday Morning |
Freezing Level 1000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 2000' |
| Monday Night |
Freezing Level 5000' |
* Easterly flow in the Cascade Passes can cause locally lower Snow or Freezing levels than areas further west.
Freezing Level is when no precipitation is forecast.
Precipitation Forecast
| Friday | Friday | |
|---|---|---|
| Hurricane Ridge | LT 0.10 | LT 0.10 |
| Mt Baker Ski Area | LT 0.10 | LT 0.10 |
| Washington Pass | LT 0.10 | LT 0.10 |
| Stevens Pass | LT 0.10 | LT 0.10 |
| Snoqualmie Pass | LT 0.10 | LT 0.10 |
| Mission Ridge | LT 0.10 | LT 0.10 |
| Crystal Mt | LT 0.10 | LT 0.10 |
| Paradise | LT 0.10 | LT 0.10 |
| White Pass | LT 0.10 | LT 0.10 |
| Mt Hood Meadows | LT 0.10 | LT 0.10 |
| Timberline | LT 0.10 | LT 0.10 |
LT = less than; WE or Water equivalent is the liquid water equivalent of melted snow in hundredths of inches. As a rough approximation 1 inch of snow = about .10 inches WE, or 10 inches of snow = about 1 inch WE.
Issued: 2:28 PM PST Sunday, February 11, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Afternoon | NNE 5 - 15 | N 10 - 20 | WNW 5 - 15 | --- - | NW 5 - 15 |
| Sunday Night | NE 15 - 25 | ENE 10 - 20 | E 5 - 15 | --- - | ENE 15 - 25 |
| Monday Morning | ENE 5 - 15 | ENE 0 - 10 | E 0 - 10 | --- - | E 5 - 15 |
| Monday Afternoon | VAR 0 - 10 | VAR 0 - 10 | W 0 - 10 | --- - | E 5 - 15 |
| Monday Night | VAR 0 - 10 | W 0 - 10 | W 5 - 15 | --- - | ENE 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Afternoon | NNE 5 - 15 |
| Sunday Night | NE 15 - 25 |
| Monday Morning | ENE 5 - 15 |
| Monday Afternoon | VAR 0 - 10 |
| Monday Night | VAR 0 - 10 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Afternoon | N 10 - 20 |
| Sunday Night | ENE 10 - 20 |
| Monday Morning | ENE 0 - 10 |
| Monday Afternoon | VAR 0 - 10 |
| Monday Night | W 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Afternoon | WNW 5 - 15 |
| Sunday Night | E 5 - 15 |
| Monday Morning | E 0 - 10 |
| Monday Afternoon | W 0 - 10 |
| Monday Night | W 5 - 15 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Sunday Afternoon | NW 5 - 15 |
| Sunday Night | ENE 15 - 25 |
| Monday Morning | E 5 - 15 |
| Monday Afternoon | E 5 - 15 |
| Monday Night | ENE 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Afternoon | NNE 5 - 15 |
| Sunday Night | NE 15 - 25 |
| Monday Morning | ENE 5 - 15 |
| Monday Afternoon | VAR 0 - 10 |
| Monday Night | VAR 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Afternoon | N 10 - 20 |
| Sunday Night | ENE 10 - 20 |
| Monday Morning | ENE 0 - 10 |
| Monday Afternoon | VAR 0 - 10 |
| Monday Night | W 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | WNW 5 - 15 |
| Sunday Night | E 5 - 15 |
| Monday Morning | E 0 - 10 |
| Monday Afternoon | W 0 - 10 |
| Monday Night | W 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Afternoon | NW 5 - 15 |
| Sunday Night | ENE 15 - 25 |
| Monday Morning | E 5 - 15 |
| Monday Afternoon | E 5 - 15 |
| Monday Night | ENE 5 - 15 |
Directions above indicate the direction the wind blows from on the 16-point cardinal scale. These winds indicate "free" winds, or those winds in the atmosphere not influenced by terrain. Topographical effects may produce greater or lower wind speeds in certain locations as well as significant variations in direction.
Free Winds at 9000' (mph)
| Mt. Baker | Washington Pass | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Afternoon | NNE 15 - 25 | NNE 20 - 30 | N 10 - 20 | --- - | WNW 5 - 15 |
| Sunday Night | NNE 25 - 35 | NNE 15 - 25 | NNE 15 - 25 | --- - | NNE 15 - 25 |
| Monday Morning | NNE 20 - 30 | NNE 20 - 30 | NNE 20 - 30 | --- - | NNE 35 - 45 |
| Monday Afternoon | NNW 15 - 25 | N 20 - 30 | NNE 20 - 30 | --- - | NNE 35 - 50 |
| Monday Night | WNW 10 - 20 | WNW 15 - 25 | NW 15 - 25 | --- - | NNE 20 - 30 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Afternoon | NNE 15 - 25 |
| Sunday Night | NNE 25 - 35 |
| Monday Morning | NNE 20 - 30 |
| Monday Afternoon | NNW 15 - 25 |
| Monday Night | WNW 10 - 20 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | NNE 20 - 30 |
| Sunday Night | NNE 15 - 25 |
| Monday Morning | NNE 20 - 30 |
| Monday Afternoon | N 20 - 30 |
| Monday Night | WNW 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | N 10 - 20 |
| Sunday Night | NNE 15 - 25 |
| Monday Morning | NNE 20 - 30 |
| Monday Afternoon | NNE 20 - 30 |
| Monday Night | NW 15 - 25 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Afternoon | WNW 5 - 15 |
| Sunday Night | NNE 15 - 25 |
| Monday Morning | NNE 35 - 45 |
| Monday Afternoon | NNE 35 - 50 |
| Monday Night | NNE 20 - 30 |
Directions above indicate the direction the wind blows from on the 16-point cardinal scale. These winds indicate "free" winds, or those winds in the atmosphere not influenced by terrain. Topographical effects may produce greater or lower wind speeds in certain locations as well as significant variations in direction.
Issued: 2:28 PM PST Sunday, February 11, 2018
Extended Weather Synopsis for Friday night through Friday
On Tuesday the high pressure will be directly over the forecast area, bringing slightly spring-like weather to the region with light westerly flow developing. On Tuesday night, a shortwave trough splits the ridge, diving S-SW on a trajectory toward our region. The trough will be located over central British Columbia on Tuesday night. As the trough and associated frontal system approach, 9000 ft westerly winds will become moderate to occasionally strong over the central Cascades. Light to moderate snow will arrive, mostly after midnight for the Washington Cascades (mainly near and west of the crest) and Olympics.
On Wednesday, the trough arrives in the early morning hours over the Pacific Northwest and digs deeper during the morning hours, before passing east of the area by nightfall. The west slopes of the Cascades should experiences moderate snowfall at low snow levels, with likely greater amounts in central-south Cascades and Hood regions. Wednesday night, snow showers end as a ridge rebuilds to the west and shifts east into our area. N-NW flow will predominate over the region.
On Thursday, the ridge continues to edge into our region as any lingering light snow showers end. Fair weather returns.
Extended Weather
Olympics, Washington Cascades and Mt. Hood Area
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Tuesday | Snow Level | 3000' - 5000' | 5000' - 7000' | 7500' - 9500' | |
| Tuesday Night | Snow Level | 1000' - 2000' | 500' - 1500' | 1500' - 3500' | |
| Wednesday | Snow Level | 1500' - 2500' | 1500' - 2500' | 2000' - 3000' | |
| Wednesday Night | Snow Level | 0' - 1000' | 500' - 1500' | 1000' - 2000' | |
| Thursday | Snow Level | 0' - 1000' | 0' - 1000' | 1000' - 2000' |
| Mt. Baker | Elevation |
|---|---|
| Tuesday |
Snow Level 3000' - 5000' |
| Tuesday Night |
Snow Level 1000' - 2000' |
| Wednesday |
Snow Level 1500' - 2500' |
| Wednesday Night |
Snow Level 0' - 1000' |
| Thursday |
Snow Level 0' - 1000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday |
Snow Level 5000' - 7000' |
| Tuesday Night |
Snow Level 500' - 1500' |
| Wednesday |
Snow Level 1500' - 2500' |
| Wednesday Night |
Snow Level 500' - 1500' |
| Thursday |
Snow Level 0' - 1000' |
| Mt. Hood | Elevation |
|---|---|
| Tuesday |
Snow Level 7500' - 9500' |
| Tuesday Night |
Snow Level 1500' - 3500' |
| Wednesday |
Snow Level 2000' - 3000' |
| Wednesday Night |
Snow Level 1000' - 2000' |
| Thursday |
Snow Level 1000' - 2000' |
* Easterly flow in the Cascade Passes can cause locally lower Snow or Freezing levels than areas further west.
Freezing Level is when no precipitation is forecast.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Previous forecast from Feb 11, 2018
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