Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Weather Synopsis for Monday & Friday
Mmmmmerry Christmas! A cold low parked over Hudson's bay will continue to keep much of North America in a cold pattern and the Pacific Northwest is no exception as many areas of the lowlands and the mountains will wake up to a White Christmas on Monday morning. While the Puget sound region is chilly, colder air is entrenched east of the Cascades.
On Monday, a weakening upper level trough moves through on westerly flow during the morning and early afternoon hours, bringing a drying trend during over the course of the day.
On Monday night, a ridge builds offshore as the Northwest stays dry with light onshore flow, becoming calm in some areas.
On Tuesday, the ridge offshore continues to keep the Northwest dry with light westerly winds.
On Tuesday night, a shortwave feature is likely to duck under the ridge and brings us a chance of some light and occasionally moderate precipitation, particularly from the Central Cascades southward.
Weather Forecast
Olympics
| Monday | Light snow showers ending the morning, becoming partly cloudy by afternoon. |
| Monday Night | Partly clear. |
| Tuesday | Mostly sunny with some high clouds. |
| Tuesday Night | Mostly clear with some high clouds. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Monday | Decreasing light, occasionally moderate snow showers. Heaviest central and south. Becoming partly cloudy north and cloudy elsewhere. |
| Monday Night | Partly cloudy with low clouds likely near the passes. |
| Tuesday | Increasing high clouds with scattered low-level clouds, most likely near the passes. |
| Tuesday Night | Light snow from Central part southward. |
East Slopes of the Washington Cascades
| Monday | Decreasing light snow showers, higher elevations, becoming mostly cloudy with low clouds likely. |
| Monday Night | Mostly cloudy with low clouds likely near the inversion top. |
| Tuesday | Increasing high clouds with low clouds near the inversion top. |
| Tuesday Night | Light snow from Central part southward. |
Mt. Hood
| Monday | Decreasing light, occasionally moderate snow showers today. |
| Monday Night | Mostly cloudy in the evening, becoming mostly clear with low clouds at top of inversion on the east side. |
| Tuesday | Increasing high clouds, becoming mostly cloudy in the afternoon. |
| Tuesday Night | Light to moderate rain and snow. |
Issued: 7:39 AM PST Monday, December 25, 2017
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Monday Morning | Snow Level * | 500' | 0' | 0' | ' | ' | 0' | ' | 2000' |
| Monday Afternoon | Snow Level * | 1000' | 0' | 500' | ' | ' | 1000' | ' | 2000' |
| Monday Night | Freezing Level * | 1000' | 1000' | 1000' | ' | ' | 1000' | ' | 2000' |
| Tuesday Morning | Freezing Level * | 2000' | 1000' | 1000' | ' | ' | 1500' | ' | 2000' |
| Tuesday Afternoon | Freezing Level * | 2000' | 1000' | 1500' | ' | ' | 2000' | ' | 2500' |
| Tuesday Night | Snow Level * | 2000' | 500' | 0' | ' | ' | 1500' | ' | 3000' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Morning |
Snow Level 500' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 1000' (Easterly Flow *) |
| Monday Night |
Freezing Level 1000' (Easterly Flow *) |
| Tuesday Morning |
Freezing Level 2000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 2000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 2000' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Monday Morning |
Snow Level 0' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 0' (Easterly Flow *) |
| Monday Night |
Freezing Level 1000' (Easterly Flow *) |
| Tuesday Morning |
Freezing Level 1000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 1000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 500' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Monday Morning |
Snow Level 0' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 500' (Easterly Flow *) |
| Monday Night |
Freezing Level 1000' (Easterly Flow *) |
| Tuesday Morning |
Freezing Level 1000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 1500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 0' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Monday Morning |
Snow Level ' (Easterly Flow *) |
| Monday Afternoon |
Snow Level ' (Easterly Flow *) |
| Monday Night |
Freezing Level ' (Easterly Flow *) |
| Tuesday Morning |
Freezing Level ' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Tuesday Night |
Snow Level ' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Monday Morning |
Snow Level ' (Easterly Flow *) |
| Monday Afternoon |
Snow Level ' (Easterly Flow *) |
| Monday Night |
Freezing Level ' (Easterly Flow *) |
| Tuesday Morning |
Freezing Level ' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Tuesday Night |
Snow Level ' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Morning |
Snow Level 0' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 1000' (Easterly Flow *) |
| Monday Night |
Freezing Level 1000' (Easterly Flow *) |
| Tuesday Morning |
Freezing Level 1500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 2000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 1500' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Morning |
Snow Level ' (Easterly Flow *) |
| Monday Afternoon |
Snow Level ' (Easterly Flow *) |
| Monday Night |
Freezing Level ' (Easterly Flow *) |
| Tuesday Morning |
Freezing Level ' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Tuesday Night |
Snow Level ' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Monday Morning |
Snow Level 2000' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 2000' (Easterly Flow *) |
| Monday Night |
Freezing Level 2000' (Easterly Flow *) |
| Tuesday Morning |
Freezing Level 2000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 2500' (Easterly Flow *) |
| Tuesday 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
| 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 0.25 | LT 0.10 |
| Mission Ridge | LT 0.10 | LT 0.10 |
| Crystal Mt | LT 0.10 | LT 0.10 |
| Paradise | LT 0.10 | LT 0.25 |
| White Pass | LT 0.10 | LT 0.10 |
| Mt Hood Meadows | LT 0.25 | LT 0.25 |
| Timberline | LT 0.25 | LT 0.25 |
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: 7:39 AM PST Monday, December 25, 2017
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Morning | W 5 - 15 | N 0 - 10 | W 5 - 15 | --- - | W 20 - 30 |
| Monday Afternoon | SW 5 - 15 | VAR 0 - 10 | W 5 - 15 | --- - | W 10 - 20 |
| Monday Night | VAR 0 - 10 | SSW 5 - 15 | VAR 0 - 10 | --- - | W 0 - 10 |
| Tuesday Morning | S 5 - 15 | S 5 - 15 | VAR 0 - 10 | --- - | SSW 5 - 15 |
| Tuesday Afternoon | SW 5 - 15 | SSW 5 - 15 | WSW 5 - 15 | --- - | WSW 10 - 20 |
| Tuesday Night | W 10 - 20 | SW 5 - 15 | W 10 - 20 | --- - | W 20 - 30 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Morning | W 5 - 15 |
| Monday Afternoon | SW 5 - 15 |
| Monday Night | VAR 0 - 10 |
| Tuesday Morning | S 5 - 15 |
| Tuesday Afternoon | SW 5 - 15 |
| Tuesday Night | W 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Monday Morning | N 0 - 10 |
| Monday Afternoon | VAR 0 - 10 |
| Monday Night | SSW 5 - 15 |
| Tuesday Morning | S 5 - 15 |
| Tuesday Afternoon | SSW 5 - 15 |
| Tuesday Night | SW 5 - 15 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Morning | W 5 - 15 |
| Monday Afternoon | W 5 - 15 |
| Monday Night | VAR 0 - 10 |
| Tuesday Morning | VAR 0 - 10 |
| Tuesday Afternoon | WSW 5 - 15 |
| Tuesday Night | W 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Monday Morning | W 20 - 30 |
| Monday Afternoon | W 10 - 20 |
| Monday Night | W 0 - 10 |
| Tuesday Morning | SSW 5 - 15 |
| Tuesday Afternoon | WSW 10 - 20 |
| Tuesday Night | W 20 - 30 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Morning | W 5 - 15 |
| Monday Afternoon | SW 5 - 15 |
| Monday Night | VAR 0 - 10 |
| Tuesday Morning | S 5 - 15 |
| Tuesday Afternoon | SW 5 - 15 |
| Tuesday Night | W 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Morning | N 0 - 10 |
| Monday Afternoon | VAR 0 - 10 |
| Monday Night | SSW 5 - 15 |
| Tuesday Morning | S 5 - 15 |
| Tuesday Afternoon | SSW 5 - 15 |
| Tuesday Night | SW 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Morning | W 5 - 15 |
| Monday Afternoon | W 5 - 15 |
| Monday Night | VAR 0 - 10 |
| Tuesday Morning | VAR 0 - 10 |
| Tuesday Afternoon | WSW 5 - 15 |
| Tuesday Night | W 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Morning | W 20 - 30 |
| Monday Afternoon | W 10 - 20 |
| Monday Night | W 0 - 10 |
| Tuesday Morning | SSW 5 - 15 |
| Tuesday Afternoon | WSW 10 - 20 |
| Tuesday Night | W 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.
Free Winds at 9000' (mph)
| Mt. Baker | Washington Pass | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Morning | W 30 - 40 | W 25 - 35 | W 35 - 45 | --- - | W 40 - 60 |
| Monday Afternoon | W 25 - 35 | W 25 - 35 | W 30 - 40 | --- - | W 40 - 60 |
| Monday Night | WSW 35 - 45 | WSW 25 - 35 | W 30 - 40 | --- - | W 35 - 45 |
| Tuesday Morning | SW 20 - 30 | SW 25 - 35 | WSW 35 - 45 | --- - | WSW 40 - 60 |
| Tuesday Afternoon | WSW 40 - 60 | WSW 35 - 45 | WSW 50 - 70 | --- - | W 50 - 70 |
| Tuesday Night | WSW 30 - 40 | W 35 - 45 | W 45 - 65 | --- - | W 55 - 75 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Morning | W 30 - 40 |
| Monday Afternoon | W 25 - 35 |
| Monday Night | WSW 35 - 45 |
| Tuesday Morning | SW 20 - 30 |
| Tuesday Afternoon | WSW 40 - 60 |
| Tuesday Night | WSW 30 - 40 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Morning | W 25 - 35 |
| Monday Afternoon | W 25 - 35 |
| Monday Night | WSW 25 - 35 |
| Tuesday Morning | SW 25 - 35 |
| Tuesday Afternoon | WSW 35 - 45 |
| Tuesday Night | W 35 - 45 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Morning | W 35 - 45 |
| Monday Afternoon | W 30 - 40 |
| Monday Night | W 30 - 40 |
| Tuesday Morning | WSW 35 - 45 |
| Tuesday Afternoon | WSW 50 - 70 |
| Tuesday Night | W 45 - 65 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Morning | W 40 - 60 |
| Monday Afternoon | W 40 - 60 |
| Monday Night | W 35 - 45 |
| Tuesday Morning | WSW 40 - 60 |
| Tuesday Afternoon | W 50 - 70 |
| Tuesday Night | W 55 - 75 |
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.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Previous forecast from Dec 22, 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.