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 & Thursday
A weakening cold upper trough digs south behind a north-south-oriented cold front. The front has moved east of the Cascade crest from the central Cascades northward, but is still over the south Cascades and Hood areas at 2PM on Sunday, bringing moderate precipitation and strong southerly wind with it. Behind the front, open cellular convection is bringing continued moderate to occasional heavy snow showers to the Northwest Cascades and Olympics on a SW flow with lighter amounts elsewhere.
Sunday night the shallow trough settles in over the Pacific Northwest bringing continued light to occasional moderate to heavier showers to locations favored in the W-SW flow.
Showers decrease and generally end during the day on Monday as a weak ridge develops.
Another system enters our coastal waters Monday night.
Weather Forecast
Olympics
| Sunday | Moderate rain and snow showers. |
| Sunday Night | Light snow showers. |
| Monday | Light snow showers, decreasing or ending in the afternoon. |
| Monday Night | Cloudy with light rain or snow possible by dawn. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Sunday | Light to moderate snow showers, heaviest North Cascades. |
| Sunday Night | Light snow showers, with occasionally moderate near the volcanoes. |
| Monday | Light to moderate snow showers in the morning, decreasing in the afternoon. Heaviest near Mt. Rainier. |
| Monday Night | Very light snow showers, ending. Otherwise mostly cloudy. |
East Slopes of the Washington Cascades
| Sunday | Light snow showers, heaviest near the crest and north. |
| Sunday Night | Light rain and snow showers. |
| Monday | Light to moderate snow showers in the morning, becoming partly cloudy in the afternoon. |
| Monday Night | Very light snow showers, ending. Otherwise mostly cloudy. |
Mt. Hood
| Sunday | Moderate rain and snow. Moderate to strong crest-level winds. |
| Sunday Night | Light rain and snow showers, becoming moderate close to morning. |
| Monday | Light to occasional moderate snow showers. |
| Monday Night | Very light snow showers, ending. Otherwise mostly cloudy. |
Issued: 2:30 PM PST Sunday, January 21, 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 * | 3000' | 2500' | 2500' | ' | ' | 3000' | ' | 4000' |
| Sunday Night | Snow Level | 2500' | 2000' | 2000' | ' | ' | 2500' | ' | 3000' |
| Monday Morning | Snow Level | 2000' | 2000' | 1500' | ' | ' | 2000' | ' | 3000' |
| Monday Afternoon | Snow Level | 2000' | 2000' | 1500' | ' | ' | 2500' | ' | 3500' |
| Monday Night | Snow Level * | 2000' | 1500' | 1000' | ' | ' | 1500' | ' | 3000' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 3000' (Easterly Flow *) |
| Sunday Night |
Snow Level 2500' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Night |
Snow Level 2000' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 2500' (Easterly Flow *) |
| Sunday Night |
Snow Level 2000' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Night |
Snow Level 1500' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 2500' (Easterly Flow *) |
| Sunday Night |
Snow Level 2000' |
| Monday Morning |
Snow Level 1500' |
| Monday Afternoon |
Snow Level 1500' |
| Monday Night |
Snow Level 1000' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level ' (Easterly Flow *) |
| Sunday Night |
Snow Level ' |
| Monday Morning |
Snow Level ' |
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level ' (Easterly Flow *) |
| Sunday Night |
Snow Level ' |
| Monday Morning |
Snow Level ' |
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 3000' (Easterly Flow *) |
| Sunday Night |
Snow Level 2500' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 2500' |
| Monday Night |
Snow Level 1500' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level ' (Easterly Flow *) |
| Sunday Night |
Snow Level ' |
| Monday Morning |
Snow Level ' |
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 4000' (Easterly Flow *) |
| Sunday Night |
Snow Level 3000' |
| Monday Morning |
Snow Level 3000' |
| Monday Afternoon |
Snow Level 3500' |
| Monday Night |
Snow Level 3000' (Easterly Flow *) |
* 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
| Thursday | Thursday | |
|---|---|---|
| Hurricane Ridge | 0 - 1.00 | LT 0.25 |
| Mt Baker Ski Area | 2.00 - 2.50 | 0.25 - 0.50 |
| Washington Pass | 0 - 0.75 | 0.25 - 0.50 |
| Stevens Pass | 0 - 0.50 | 0 - 0.50 |
| Snoqualmie Pass | 0 - 0.75 | 0 - 0.50 |
| Mission Ridge | LT 0.25 | LT 0.10 |
| Crystal Mt | 0.75 - 1.00 | LT 0.25 |
| Paradise | 0 - 1.00 | 0.50 - 0.75 |
| White Pass | 0.25 - 0.50 | 0 - 0.50 |
| Mt Hood Meadows | 0 - 0.50 | 0.25 - 0.50 |
| Timberline | 0.50 - 0.75 | 0.25 - 0.50 |
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: 2:30 PM PST Sunday, January 21, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Afternoon | SW 25 - 35 | SSW 20 - 30 | SW 20 - 30 | --- - | WSW 20 - 30 |
| Sunday Night | SW 20 - 30 | SSW 20 - 30 | SW 25 - 35 | --- - | SW 20 - 30 |
| Monday Morning | WSW 20 - 30 | SW 15 - 25 | WSW 20 - 30 | --- - | WSW 25 - 35 |
| Monday Afternoon | WSW 5 - 15 | SW 10 - 20 | W 10 - 20 | --- - | WSW 10 - 20 |
| Monday Night | S 5 - 15 | SW 5 - 15 | SW 5 - 15 | --- - | SW 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Afternoon | SW 25 - 35 |
| Sunday Night | SW 20 - 30 |
| Monday Morning | WSW 20 - 30 |
| Monday Afternoon | WSW 5 - 15 |
| Monday Night | S 5 - 15 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Afternoon | SSW 20 - 30 |
| Sunday Night | SSW 20 - 30 |
| Monday Morning | SW 15 - 25 |
| Monday Afternoon | SW 10 - 20 |
| Monday Night | SW 5 - 15 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Afternoon | SW 20 - 30 |
| Sunday Night | SW 25 - 35 |
| Monday Morning | WSW 20 - 30 |
| Monday Afternoon | W 10 - 20 |
| Monday Night | SW 5 - 15 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Sunday Afternoon | WSW 20 - 30 |
| Sunday Night | SW 20 - 30 |
| Monday Morning | WSW 25 - 35 |
| Monday Afternoon | WSW 10 - 20 |
| Monday Night | SW 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Afternoon | SW 25 - 35 |
| Sunday Night | SW 20 - 30 |
| Monday Morning | WSW 20 - 30 |
| Monday Afternoon | WSW 5 - 15 |
| Monday Night | S 5 - 15 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Afternoon | SSW 20 - 30 |
| Sunday Night | SSW 20 - 30 |
| Monday Morning | SW 15 - 25 |
| Monday Afternoon | SW 10 - 20 |
| Monday Night | SW 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | SW 20 - 30 |
| Sunday Night | SW 25 - 35 |
| Monday Morning | WSW 20 - 30 |
| Monday Afternoon | W 10 - 20 |
| Monday Night | SW 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Afternoon | WSW 20 - 30 |
| Sunday Night | SW 20 - 30 |
| Monday Morning | WSW 25 - 35 |
| Monday Afternoon | WSW 10 - 20 |
| Monday Night | SW 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 | SSW 35 - 50 | SSW 35 - 50 | SW 35 - 50 | --- - | SW 45 - 65 |
| Sunday Night | SW 30 - 40 | SW 30 - 40 | SW 30 - 40 | --- - | SW 35 - 50 |
| Monday Morning | SW 30 - 40 | SW 30 - 40 | WSW 35 - 50 | --- - | WSW 35 - 50 |
| Monday Afternoon | SW 20 - 30 | SW 20 - 30 | WSW 30 - 40 | --- - | WSW 25 - 35 |
| Monday Night | SW 25 - 35 | SW 20 - 30 | SW 30 - 40 | --- - | SW 20 - 30 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Afternoon | SSW 35 - 50 |
| Sunday Night | SW 30 - 40 |
| Monday Morning | SW 30 - 40 |
| Monday Afternoon | SW 20 - 30 |
| Monday Night | SW 25 - 35 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | SSW 35 - 50 |
| Sunday Night | SW 30 - 40 |
| Monday Morning | SW 30 - 40 |
| Monday Afternoon | SW 20 - 30 |
| Monday Night | SW 20 - 30 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | SW 35 - 50 |
| Sunday Night | SW 30 - 40 |
| Monday Morning | WSW 35 - 50 |
| Monday Afternoon | WSW 30 - 40 |
| Monday Night | SW 30 - 40 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Afternoon | SW 45 - 65 |
| Sunday Night | SW 35 - 50 |
| Monday Morning | WSW 35 - 50 |
| Monday Afternoon | WSW 25 - 35 |
| Monday Night | SW 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: 2:30 PM PST Sunday, January 21, 2018
Extended Weather Synopsis for Thursday night through Thursday
On Tuesday, a low pressure will move to the west of Vancouver Island and then track north along the coast. The associated front arrives in a bow-shape with a broad precipitation shield. It works its way SE during the day, but stalls in the south Cascades and Hood areas through the overnight hours on Tuesday.
A second upper and surface low within the broader trough move into the coastal waters Wednesday afternoon and generally lingers with slight northward progression Wednesday night bringing a cool SW flow with bands of precipitation spiraling around it.
On Thursday, the Pacific Northwest sits squarely in the broad trough with the upper level and surface low progressing onshore into British Columbia, bringing cool westerly flow to our region and mountain snows.
Extended Weather
Olympics, Washington Cascades and Mt. Hood Area
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Tuesday | Snow Level | 0' - 2000' | 2000' - 4000' | 3000' - 5000' | * |
| Tuesday Night | Snow Level | 1000' - 3000' | 1000' - 3000' | 4000' - 6000' | * |
| Wednesday | Snow Level | 2000' - 3000' | 2500' - 4500' | 3000' - 5000' | * |
| Wednesday Night | Snow Level | 0' - 1000' | 0' - 1000' | 0' - 2000' | * |
| Thursday | Snow Level | 0' - 1500' | 1000' - 2000' | 1000' - 2000' | * |
| Mt. Baker | Elevation |
|---|---|
| Tuesday |
Snow Level 0' - 2000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 1000' - 3000' (Easterly Flow *) |
| Wednesday |
Snow Level 2000' - 3000' (Easterly Flow *) |
| Wednesday Night |
Snow Level 0' - 1000' (Easterly Flow *) |
| Thursday |
Snow Level 0' - 1500' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday |
Snow Level 2000' - 4000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 1000' - 3000' (Easterly Flow *) |
| Wednesday |
Snow Level 2500' - 4500' (Easterly Flow *) |
| Wednesday Night |
Snow Level 0' - 1000' (Easterly Flow *) |
| Thursday |
Snow Level 1000' - 2000' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Tuesday |
Snow Level 3000' - 5000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 4000' - 6000' (Easterly Flow *) |
| Wednesday |
Snow Level 3000' - 5000' (Easterly Flow *) |
| Wednesday Night |
Snow Level 0' - 2000' (Easterly Flow *) |
| Thursday |
Snow Level 1000' - 2000' (Easterly Flow *) |
* 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 Jan 21, 2018
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