Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Wednesday & Friday
On Wednesday morning, an elongated upper trough sits over the northeast Pacific with very warm, moist south southwesterly flow over the Pacific Northwest. Between more organized, wetter systems Tuesday and Thursday, today is a relative break in the moisture onslaught, but moderate rain is still present at some locations. Wednesday night into Thursday, a cold front crosses the Olympics and Cascades, bringing the high freezing levels back to more seasonal norms by Thursday evening. A shortwave will enhance the cold front on Thursday afternoon. Showers and decreasing moisture will follow the front as flow turns more westerly.
Weather Forecast
Olympics
| Wednesday Morning - Wednesday |
Light showers. |
| Wednesday Afternoon |
Light showers. |
| Wednesday Night |
Increasing moderate rain. |
| Thursday Morning |
Light to moderate rain and snow. |
| Thursday Afternoon |
Light rain and snow showers. |
| Thursday Night |
Light rain and snow showers. |
Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Wednesday Morning - Wednesday |
Light to moderate showers. |
| Wednesday Afternoon |
Light to moderate showers. |
| Wednesday Night |
Increasing moderate to heavy rain. |
| Thursday Morning |
Moderate to heavy rain and snow. |
| Thursday Afternoon |
Light to moderate rain and snow showers north and central parts; Moderate to heavy rain and snow showers southern part. |
| Thursday Night |
Light to moderate rain and snow showers north; light rain and snow showers central and south. |
East slopes of the Washington Cascades
| Wednesday Morning - Wednesday |
Light showers. |
| Wednesday Afternoon |
Light showers. |
| Wednesday Night |
Light rain in the evening, then increasing moderate rain after midnight. |
| Thursday Morning |
Moderate rain and snow showers. |
| Thursday Afternoon |
Light rain and snow showers north and central; moderate rain and snow showers south. |
| Thursday Night |
Light to moderate rain and snow showers north; light rain and snow showers central and south. |
Mt. Hood Area
| Wednesday Morning - Wednesday |
Light showers. |
| Wednesday Afternoon |
Light showers. |
| Wednesday Night |
Light showers evening then increasing to moderate to heavy by morning. |
| Thursday Morning |
Moderate to heavy rain and snow. |
| Thursday Afternoon |
Moderate to heavy rain and snow. |
| Thursday Night |
Moderate to heavy rain and snow in the evening, turning to light showers around midnight. |
Issued: 5:17 PM PST Wednesday, November 22, 2017
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Wednesday Morning | Snow Level | 9000' | 8500' | 9000' | ' | ' | 9000' | ' | 10000' |
| Wednesday Afternoon | Snow Level | 9000' | 8500' | 9000' | ' | ' | 9000' | ' | 10000' |
| Wednesday Night | Snow Level | 6500' | 6500' | 7500' | ' | ' | 7500' | ' | 9000' |
| Thursday Morning | Snow Level | 5000' | 4500' | 6000' | ' | ' | 6500' | ' | 7500' |
| Thursday Afternoon | Snow Level | 5000' | 4500' | 6000' | ' | ' | 6500' | ' | 7500' |
| Thursday Night | Snow Level | 4000' | 3500' | 4500' | ' | ' | 4000' | ' | 6500' |
| Hurricane Ridge | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 9000' |
| Wednesday Afternoon |
Snow Level 9000' |
| Wednesday Night |
Snow Level 6500' |
| Thursday Morning |
Snow Level 5000' |
| Thursday Afternoon |
Snow Level 5000' |
| Thursday Night |
Snow Level 4000' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 8500' |
| Wednesday Afternoon |
Snow Level 8500' |
| Wednesday Night |
Snow Level 6500' |
| Thursday Morning |
Snow Level 4500' |
| Thursday Afternoon |
Snow Level 4500' |
| Thursday Night |
Snow Level 3500' |
| Washington Pass | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 9000' |
| Wednesday Afternoon |
Snow Level 9000' |
| Wednesday Night |
Snow Level 7500' |
| Thursday Morning |
Snow Level 6000' |
| Thursday Afternoon |
Snow Level 6000' |
| Thursday Night |
Snow Level 4500' |
| Leavenworth | Elevation |
|---|---|
| Wednesday Morning |
Snow Level ' |
| Wednesday Afternoon |
Snow Level ' |
| Wednesday Night |
Snow Level ' |
| Thursday Morning |
Snow Level ' |
| Thursday Afternoon |
Snow Level ' |
| Thursday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Wednesday Morning |
Snow Level ' |
| Wednesday Afternoon |
Snow Level ' |
| Wednesday Night |
Snow Level ' |
| Thursday Morning |
Snow Level ' |
| Thursday Afternoon |
Snow Level ' |
| Thursday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 9000' |
| Wednesday Afternoon |
Snow Level 9000' |
| Wednesday Night |
Snow Level 7500' |
| Thursday Morning |
Snow Level 6500' |
| Thursday Afternoon |
Snow Level 6500' |
| Thursday Night |
Snow Level 4000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Wednesday Morning |
Snow Level ' |
| Wednesday Afternoon |
Snow Level ' |
| Wednesday Night |
Snow Level ' |
| Thursday Morning |
Snow Level ' |
| Thursday Afternoon |
Snow Level ' |
| Thursday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 10000' |
| Wednesday Afternoon |
Snow Level 10000' |
| Wednesday Night |
Snow Level 9000' |
| Thursday Morning |
Snow Level 7500' |
| Thursday Afternoon |
Snow Level 7500' |
| Thursday Night |
Snow Level 6500' |
* 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 | 0 - 0.50 | 0 - 0.50 |
| Mt Baker Ski Area | 0 - 2.00 | 1.00 - 1.50 |
| Washington Pass | 0 - 1.00 | 0 - 1.00 |
| Stevens Pass | 0 - 1.00 | 1.00 - 1.50 |
| Snoqualmie Pass | 0 - 0.50 | 1.00 - 1.50 |
| Mission Ridge | LT 0.25 | 0 - 0.50 |
| Crystal Mt | 0.25 - 0.50 | 0.75 - 1.00 |
| Paradise | 0 - 1.50 | 1.50 - 2.00 |
| White Pass | 0 - 0.50 | 0 - 1.50 |
| Mt Hood Meadows | 0.25 - 0.50 | 1.00 - 1.50 |
| Timberline | 0.25 - 0.50 | 1.00 - 1.50 |
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: 5:17 PM PST Wednesday, November 22, 2017
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Wednesday Morning | SSW 30 - 40 | S 20 - 30 | SSW 25 - 35 | --- - | SSW 30 - 40 |
| Wednesday Afternoon | SSW 40 - 55 | SE 25 - 35 | SSW 15 - 25 | --- - | SSW 30 - 40 |
| Wednesday Night | SSW 40 - 55 | SSW 40 - 60 | SSW 30 - 40 | --- - | SSW 30 - 40 |
| Thursday Morning | SW 30 - 40 | SW 25 - 35 | WSW 25 - 35 | --- - | SW 40 - 55 |
| Thursday Afternoon | SW 25 - 35 | SW 20 - 30 | WSW 20 - 30 | --- - | WSW 35 - 50 |
| Thursday Night | SSW 40 - 55 | SE 50 - 70 | SSW 35 - 50 | --- - | SW 30 - 40 |
| Hurricane Ridge | Elevation |
|---|---|
| Wednesday Morning | SSW 30 - 40 |
| Wednesday Afternoon | SSW 40 - 55 |
| Wednesday Night | SSW 40 - 55 |
| Thursday Morning | SW 30 - 40 |
| Thursday Afternoon | SW 25 - 35 |
| Thursday Night | SSW 40 - 55 |
| Mt. Baker | Elevation |
|---|---|
| Wednesday Morning | S 20 - 30 |
| Wednesday Afternoon | SE 25 - 35 |
| Wednesday Night | SSW 40 - 60 |
| Thursday Morning | SW 25 - 35 |
| Thursday Afternoon | SW 20 - 30 |
| Thursday Night | SE 50 - 70 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Wednesday Morning | SSW 25 - 35 |
| Wednesday Afternoon | SSW 15 - 25 |
| Wednesday Night | SSW 30 - 40 |
| Thursday Morning | WSW 25 - 35 |
| Thursday Afternoon | WSW 20 - 30 |
| Thursday Night | SSW 35 - 50 |
| Mt. Rainier | Elevation |
|---|---|
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Wednesday Morning | SSW 30 - 40 |
| Wednesday Afternoon | SSW 30 - 40 |
| Wednesday Night | SSW 30 - 40 |
| Thursday Morning | SW 40 - 55 |
| Thursday Afternoon | WSW 35 - 50 |
| Thursday Night | SW 30 - 40 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Wednesday Morning | SSW 30 - 40 |
| Wednesday Afternoon | SSW 40 - 55 |
| Wednesday Night | SSW 40 - 55 |
| Thursday Morning | SW 30 - 40 |
| Thursday Afternoon | SW 25 - 35 |
| Thursday Night | SSW 40 - 55 |
| Mt. Baker | Direction - Speed |
|---|---|
| Wednesday Morning | S 20 - 30 |
| Wednesday Afternoon | SE 25 - 35 |
| Wednesday Night | SSW 40 - 60 |
| Thursday Morning | SW 25 - 35 |
| Thursday Afternoon | SW 20 - 30 |
| Thursday Night | SE 50 - 70 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Wednesday Morning | SSW 25 - 35 |
| Wednesday Afternoon | SSW 15 - 25 |
| Wednesday Night | SSW 30 - 40 |
| Thursday Morning | WSW 25 - 35 |
| Thursday Afternoon | WSW 20 - 30 |
| Thursday Night | SSW 35 - 50 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Wednesday Morning | SSW 30 - 40 |
| Wednesday Afternoon | SSW 30 - 40 |
| Wednesday Night | SSW 30 - 40 |
| Thursday Morning | SW 40 - 55 |
| Thursday Afternoon | WSW 35 - 50 |
| Thursday Night | SW 30 - 40 |
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 | |
|---|---|---|---|---|---|
| Wednesday Morning | SSW 35 - 50 | SSW 40 - 55 | SSW 40 - 55 | --- - | WSW 45 - 65 |
| Wednesday Afternoon | SSW 45 - 65 | SSW 50 - 70 | SSW 50 - 70 | --- - | SSW 45 - 65 |
| Wednesday Night | SSW 60 - 80 | SSW 50 - 70 | SSW 55 - 75 | --- - | SSW 55 - 75 |
| Thursday Morning | WSW 55 - 75 | SW 65 - 85 | SW 65 - 85 | --- - | SW 60 - 80 |
| Thursday Afternoon | SW 40 - 55 | SW 40 - 55 | SW 55 - 75 | --- - | SW 65 - 85 |
| Thursday Night | SW 30 - 40 | SW 30 - 40 | WSW 40 - 55 | --- - | WSW 50 - 70 |
| Mt. Baker | Direction - Speed |
|---|---|
| Wednesday Morning | SSW 35 - 50 |
| Wednesday Afternoon | SSW 45 - 65 |
| Wednesday Night | SSW 60 - 80 |
| Thursday Morning | WSW 55 - 75 |
| Thursday Afternoon | SW 40 - 55 |
| Thursday Night | SW 30 - 40 |
| Washington Pass | Direction - Speed |
|---|---|
| Wednesday Morning | SSW 40 - 55 |
| Wednesday Afternoon | SSW 50 - 70 |
| Wednesday Night | SSW 50 - 70 |
| Thursday Morning | SW 65 - 85 |
| Thursday Afternoon | SW 40 - 55 |
| Thursday Night | SW 30 - 40 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Wednesday Morning | SSW 40 - 55 |
| Wednesday Afternoon | SSW 50 - 70 |
| Wednesday Night | SSW 55 - 75 |
| Thursday Morning | SW 65 - 85 |
| Thursday Afternoon | SW 55 - 75 |
| Thursday Night | WSW 40 - 55 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Wednesday Morning | WSW 45 - 65 |
| Wednesday Afternoon | SSW 45 - 65 |
| Wednesday Night | SSW 55 - 75 |
| Thursday Morning | SW 60 - 80 |
| Thursday Afternoon | SW 65 - 85 |
| Thursday Night | WSW 50 - 70 |
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: 5:17 PM PST Wednesday, November 22, 2017
Extended Weather Synopsis for Friday night through Friday
On Friday, continued moderate southwesterly flow in advance of a front approaching the Pacific Northwest coastal waters. Saturday and Sunday, a longwave trough over the coastal waters brings a series of wet fronts. from southwest to northeast across the region.
Extended Weather
All zones
Moderate to heavy rain and snow showers Olympics and Northwest Cascades; light rain and snow showers central and south Cascades.
Moderate to heavy rain and snow showers Olympics and Northwest Cascades; light rain and snow showers central and south Cascades.
Increasing moderate rain and snow, heaviest south.
Periods of moderate to heavy rain and snow.
Rain and snow becoming showers.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Friday | Snow Level | 3000' - 4000' | 3000' - 4000' | 3500' - 4500' | |
| Saturday | Snow Level | 3500' - 4500' | 3500' - 5500' | 7000' - 8000' | |
| Sunday | Snow Level | 3000' - 4500' | 3500' - 5000' | 4000' - 5000' |
| Mt. Baker | Elevation |
|---|---|
| Friday |
Snow Level 3000' - 4000' |
| Saturday |
Snow Level 3500' - 4500' |
| Sunday |
Snow Level 3000' - 4500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Friday |
Snow Level 3000' - 4000' |
| Saturday |
Snow Level 3500' - 5500' |
| Sunday |
Snow Level 3500' - 5000' |
| Mt. Hood | Elevation |
|---|---|
| Friday |
Snow Level 3500' - 4500' |
| Saturday |
Snow Level 7000' - 8000' |
| Sunday |
Snow Level 4000' - 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.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Previous forecast from Nov 20, 2017
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.