Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Monday & Friday
On Monday morning, a splitting upper trough will move across the West Coast, with the main part of the trough across Northern California. Monday afternoon and evening a shortwave ridge moves over the Pacific Northwest. On Tuesday a front crosses the Cascades in the afternoon and then a shortwaves trough will follow.
Weather Forecast
Olympics
| Monday Afternoon |
Mix of sun and clouds. |
| Monday Night |
Increasing light to moderate rain and snow, mainly after midnight. |
| Tuesday Morning |
Moderate to heavy rain and snow. |
| Tuesday Afternoon |
Light to moderate showers. |
| Tuesday Night |
Decreasing light showers. |
Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Monday Afternoon |
Decreasing light showers. |
| Monday Night |
Increasing light rain and snow, mainly northern part and after midnight. |
| Tuesday Morning |
Increasing light to moderate rain and snow except moderate to heavy northern part. |
| Tuesday Afternoon |
Decreasing moderate to heavy showers. |
| Tuesday Night |
Light to moderate showers, heaviest in convergence band from Stevens to Snoqualmie. |
East slopes of the Washington Cascades
| Monday Afternoon |
Partly to mostly cloudy with a chance of showers higher elevations in the north. |
| Monday Night |
Partly to mostly clear with increasing light rain and snow in the north, after midnight. |
| Tuesday Morning |
Increasing light to moderate rain and snow north and increasing light rain and snow central and south. |
| Tuesday Afternoon |
Decreasing light to moderate showers. |
| Tuesday Night |
Light showers. |
Mt. Hood Area
| Monday Afternoon |
Partly to mostly cloudy. |
| Monday Night |
Partly clear. |
| Tuesday Morning |
Increasing light rain and snow. |
| Tuesday Afternoon |
Decreasing moderate to heavy showers. |
| Tuesday Night |
Decreasing light to moderate showers. |
Issued: 12:47 PM PST Monday, November 27, 2017
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Monday Afternoon | Snow Level | 3000' | 2500' | 2500' | ' | ' | 3000' | ' | 3500' |
| Monday Night | Snow Level * | 5500' | 3500' | 200' | ' | ' | 3500' | ' | 4000' |
| Tuesday Morning | Snow Level * | 4000' | 3000' | 2500' | ' | ' | 4000' | ' | 5500' |
| Tuesday Afternoon | Snow Level | 2500' | 2500' | 2500' | ' | ' | 3000' | ' | 3500' |
| Tuesday Night | Snow Level | 2500' | 2000' | 2000' | ' | ' | 2500' | ' | 3000' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3000' |
| Monday Night |
Snow Level 5500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 4000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 2500' |
| Tuesday Night |
Snow Level 2500' |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 2500' |
| Monday Night |
Snow Level 3500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 3000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 2500' |
| Tuesday Night |
Snow Level 2000' |
| Washington Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 2500' |
| Monday Night |
Snow Level 200' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 2500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 2500' |
| Tuesday Night |
Snow Level 2000' |
| Leavenworth | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Tuesday Morning |
Snow Level ' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Tuesday Morning |
Snow Level ' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3000' |
| Monday Night |
Snow Level 3500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 4000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 3000' |
| Tuesday Night |
Snow Level 2500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Tuesday Morning |
Snow Level ' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3500' |
| Monday Night |
Snow Level 4000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 5500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 3500' |
| Tuesday Night |
Snow Level 3000' |
* 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 0.25 | 0 - 0.50 |
| Mt Baker Ski Area | 0.25 - 0.50 | 1.00 - 1.50 |
| Washington Pass | LT 0.25 | 0 - 0.75 |
| Stevens Pass | LT 0.25 | 0.75 - 1.00 |
| Snoqualmie Pass | 0.25 - 0.50 | LT 0.25 |
| Mission Ridge | LT 0.10 | 0 - 0.50 |
| Crystal Mt | LT 0.10 | 0 - 0.50 |
| Paradise | LT 0.25 | 0 - 1.00 |
| White Pass | LT 0.25 | 0 - 0.50 |
| Mt Hood Meadows | LT 0.10 | 0 - 0.75 |
| Timberline | LT 0.25 | 0.75 - 1.00 |
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: 12:47 PM PST Monday, November 27, 2017
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Afternoon | SW 10 - 15 | SW 10 - 15 | W 15 - 20 | --- - | WSW 15 - 20 |
| Monday Night | S 20 - 40 | S 10 - 30 | SE 15 - 20 | --- - | SSW 10 - 15 |
| Tuesday Morning | W 20 - 30 | S 25 - 35 | SE 20 - 30 | --- - | SSW 15 - 20 |
| Tuesday Afternoon | W 20 - 30 | W 15 - 20 | WSW 15 - 20 | --- - | WSW 20 - 30 |
| Tuesday Night | W 15 - 20 | WSW 10 - 15 | W 15 - 20 | --- - | W 25 - 35 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon | SW 10 - 15 |
| Monday Night | S 20 - 40 |
| Tuesday Morning | W 20 - 30 |
| Tuesday Afternoon | W 20 - 30 |
| Tuesday Night | W 15 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon | SW 10 - 15 |
| Monday Night | S 10 - 30 |
| Tuesday Morning | S 25 - 35 |
| Tuesday Afternoon | W 15 - 20 |
| Tuesday Night | WSW 10 - 15 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon | W 15 - 20 |
| Monday Night | SE 15 - 20 |
| Tuesday Morning | SE 20 - 30 |
| Tuesday Afternoon | WSW 15 - 20 |
| Tuesday Night | W 15 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon | WSW 15 - 20 |
| Monday Night | SSW 10 - 15 |
| Tuesday Morning | SSW 15 - 20 |
| Tuesday Afternoon | WSW 20 - 30 |
| Tuesday Night | W 25 - 35 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Afternoon | SW 10 - 15 |
| Monday Night | S 20 - 40 |
| Tuesday Morning | W 20 - 30 |
| Tuesday Afternoon | W 20 - 30 |
| Tuesday Night | W 15 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | SW 10 - 15 |
| Monday Night | S 10 - 30 |
| Tuesday Morning | S 25 - 35 |
| Tuesday Afternoon | W 15 - 20 |
| Tuesday Night | WSW 10 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | W 15 - 20 |
| Monday Night | SE 15 - 20 |
| Tuesday Morning | SE 20 - 30 |
| Tuesday Afternoon | WSW 15 - 20 |
| Tuesday Night | W 15 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | WSW 15 - 20 |
| Monday Night | SSW 10 - 15 |
| Tuesday Morning | SSW 15 - 20 |
| Tuesday Afternoon | WSW 20 - 30 |
| Tuesday Night | W 25 - 35 |
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 | |
|---|---|---|---|---|---|
| Monday Afternoon | WSW 20 - 30 | W 30 - 40 | W 30 - 40 | --- - | W 25 - 35 |
| Monday Night | SW 40 - 60 | SW 35 - 50 | SW 35 - 50 | --- - | WSW 20 - 30 |
| Tuesday Morning | SSW 50 - 70 | SSW 40 - 55 | SSW 40 - 55 | --- - | SW 30 - 40 |
| Tuesday Afternoon | WSW 20 - 25 | WSW 20 - 25 | WSW 25 - 35 | --- - | WSW 30 - 40 |
| Tuesday Night | WNW 20 - 30 | WNW 30 - 40 | WNW 30 - 45 | --- - | WNW 30 - 45 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | WSW 20 - 30 |
| Monday Night | SW 40 - 60 |
| Tuesday Morning | SSW 50 - 70 |
| Tuesday Afternoon | WSW 20 - 25 |
| Tuesday Night | WNW 20 - 30 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Afternoon | W 30 - 40 |
| Monday Night | SW 35 - 50 |
| Tuesday Morning | SSW 40 - 55 |
| Tuesday Afternoon | WSW 20 - 25 |
| Tuesday Night | WNW 30 - 40 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | W 30 - 40 |
| Monday Night | SW 35 - 50 |
| Tuesday Morning | SSW 40 - 55 |
| Tuesday Afternoon | WSW 25 - 35 |
| Tuesday Night | WNW 30 - 45 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | W 25 - 35 |
| Monday Night | WSW 20 - 30 |
| Tuesday Morning | SW 30 - 40 |
| Tuesday Afternoon | WSW 30 - 40 |
| Tuesday Night | WNW 30 - 45 |
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: 12:47 PM PST Monday, November 27, 2017
Extended Weather Synopsis for Friday night through Friday
On Wednesday, a shortwave ridge crosses the Pacific Northwest. On Thursday, a weakening front arrives in moderate west southwest flow. On Friday, a slow moving upper trough sits off the British Columbia coast and a front approaches the Northwest coastal waters.
Extended Weather
All Zones
Light orographic showers, decreasing.
Increasing moderate rain and snow, heaviest Olympics and Northwest Cascades. Rapidly decreasing showers Thursday night.
Increasing rain and snow, mainly Olympics and Northwest Cascades.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Wednesday | Snow Level | 3000' - 4000' | 3000' - 4000' | 4000' - 5000' | |
| Wednesday Night | Snow Level | 2500' - 3500' | 3500' - 4500' | 5000' - 6000' | |
| Thursday | Snow Level | 3000' - 4000' | 3500' - 4500' | 4000' - 5000' | |
| Friday Night | Snow Level | 2000' - 3000' | 3000' - 4000' | 3500' - 4500' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday |
Snow Level 3000' - 4000' |
| Wednesday Night |
Snow Level 2500' - 3500' |
| Thursday |
Snow Level 3000' - 4000' |
| Friday Night |
Snow Level 2000' - 3000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday |
Snow Level 3000' - 4000' |
| Wednesday Night |
Snow Level 3500' - 4500' |
| Thursday |
Snow Level 3500' - 4500' |
| Friday Night |
Snow Level 3000' - 4000' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday |
Snow Level 4000' - 5000' |
| Wednesday Night |
Snow Level 5000' - 6000' |
| Thursday |
Snow Level 4000' - 5000' |
| Friday Night |
Snow Level 3500' - 4500' |
* 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 27, 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.