Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Saturday & Monday
A developing low pressure well offshore will track N-NE toward Vancouver island tonight. This storm system will punch on the mild side for our mountains thanks to the quasi-stationary upper level ridge parked over the Baja Peninsula that is steering warmer air and SW flow over the region.
Warm frontal precipitation has begun to spread over the region from south to north this afternoon. Precipitation should increase for all areas this evening, however look for a lull in the precipitation from Snoqualmie Pass and south during the morning hours as the warm front lifts north. Locally heavy precipitation will continue in the Mt. Baker area during this time.
Mild air will flood into the region tonight and it won't be until the trailing frontal passage Sunday afternoon that we see a meaningful cooling trend. Moderate to strong offshore flow may allow for some initial mixed precipitation in the Passes Saturday evening. Snow levels will peak in the early morning hours before gradually lowering throughout the day on Sunday. Alpine winds look very strong, especially over Mt. Hood as the jet traverses over central Oregon on Sunday. As an open trough moves over the region Sunday night, further cooling should ensue with showers.
Weather Forecast
Olympics
| Saturday |
Increasing and lowering clouds through the day. Light rain and snow developing by mid-day. |
| Saturday Night |
Light to moderate rain and snow. Warming trend. Windy. |
| Sunday Morning |
Moderate rain and snow. Mild. Windy. |
| Sunday Afternoon |
Light to moderate showers. Cooling trend. Windy. |
| Sunday Night |
Light to occasionally moderate rain and snow showers. Cooler. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Saturday |
Increasing and lowering clouds through the day. Light rain and snow developing in the south Cascades early afternoon and spreading northward through late afternoon. |
| Saturday Evening |
Light to occasionally moderate rain and snow, except locally heavy Mt. Baker area. Warming trend. Locally cooler with light mixed precipitation possible Cascade Passes. |
| Sunday Morning |
Light to moderate rain and snow, except locally heavy Mt. Baker area. Mild. |
| Sunday Afternoon |
Light to moderate showers. Cooling trend. Windy. |
| Sunday Night |
Light to occasionally moderate rain and snow showers. Cooler. |
| Saturday Night |
Cloudy with periods of light rain except rain locally heavy Mt. Baker area. Warming trend. |
East slopes of the Washington Cascades
| Saturday |
Increasing clouds. Light rain and snow developing in the south Cascades early afternoon and spreading northward through late afternoon. |
| Saturday Evening |
Light to occasionally moderate rain and snow. Warming trend. |
| Sunday Morning |
Light to occasionally moderate rain and snow. Milder. |
| Sunday Afternoon |
Light to occasionally moderate showers, mainly near the Cascade crest. Cooling trend late afternoon. Windy. |
| Sunday Night |
Light rain and snow showers. Cooler. |
| Saturday Night |
Cloudy with periods of light rain and snow. Warming trend. |
Mt. Hood Area
| Saturday |
Increasing and lowering clouds through the day. Light rain and snow developing mid-morning. |
| Saturday Night |
Very light rain and snow. Warming trend. Very windy alpine. |
| Sunday Morning |
Light rain and snow. Mild. Very windy alpine. |
| Sunday Afternoon |
Light to occasionally rain and snow moderate showers. Cooling trend. Windy. |
| Sunday Night |
Light to occasionally moderate rain and snow showers. Cooler. |
Issued: 2:13 PM PST Saturday, November 25, 2017
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Saturday Afternoon | Snow Level * | 6000' | 4500' | 4000' | ' | ' | 500' | ' | 7500' |
| Saturday Night | Snow Level * | 7500' | 6500' | 4500' | ' | ' | 7000' | ' | 8500' |
| Sunday Morning | Snow Level * | 8000' | 7000' | 6500' | ' | ' | 7000' | ' | 8000' |
| Sunday Mid-day | Snow Level | 6000' | 5500' | 6000' | ' | ' | 5500' | ' | 6500' |
| Sunday Afternoon | Snow Level | 3500' | 4000' | 4500' | ' | ' | 4000' | ' | 4500' |
| Sunday Night | Snow Level | 3000' | 2500' | 2500' | ' | ' | 3000' | ' | 3500' |
| Hurricane Ridge | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level 6000' (Easterly Flow *) |
| Saturday Night |
Snow Level 7500' (Easterly Flow *) |
| Sunday Morning |
Snow Level 8000' (Easterly Flow *) |
| Sunday Mid-day |
Snow Level 6000' |
| Sunday Afternoon |
Snow Level 3500' |
| Sunday Night |
Snow Level 3000' |
| Mt. Baker | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level 4500' (Easterly Flow *) |
| Saturday Night |
Snow Level 6500' (Easterly Flow *) |
| Sunday Morning |
Snow Level 7000' (Easterly Flow *) |
| Sunday Mid-day |
Snow Level 5500' |
| Sunday Afternoon |
Snow Level 4000' |
| Sunday Night |
Snow Level 2500' |
| Washington Pass | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level 4000' (Easterly Flow *) |
| Saturday Night |
Snow Level 4500' (Easterly Flow *) |
| Sunday Morning |
Snow Level 6500' (Easterly Flow *) |
| Sunday Mid-day |
Snow Level 6000' |
| Sunday Afternoon |
Snow Level 4500' |
| Sunday Night |
Snow Level 2500' |
| Leavenworth | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level ' (Easterly Flow *) |
| Saturday Night |
Snow Level ' (Easterly Flow *) |
| Sunday Morning |
Snow Level ' (Easterly Flow *) |
| Sunday Mid-day |
Snow Level ' |
| Sunday Afternoon |
Snow Level ' |
| Sunday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level ' (Easterly Flow *) |
| Saturday Night |
Snow Level ' (Easterly Flow *) |
| Sunday Morning |
Snow Level ' (Easterly Flow *) |
| Sunday Mid-day |
Snow Level ' |
| Sunday Afternoon |
Snow Level ' |
| Sunday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level 500' (Easterly Flow *) |
| Saturday Night |
Snow Level 7000' (Easterly Flow *) |
| Sunday Morning |
Snow Level 7000' (Easterly Flow *) |
| Sunday Mid-day |
Snow Level 5500' |
| Sunday Afternoon |
Snow Level 4000' |
| Sunday Night |
Snow Level 3000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level ' (Easterly Flow *) |
| Saturday Night |
Snow Level ' (Easterly Flow *) |
| Sunday Morning |
Snow Level ' (Easterly Flow *) |
| Sunday Mid-day |
Snow Level ' |
| Sunday Afternoon |
Snow Level ' |
| Sunday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level 7500' (Easterly Flow *) |
| Saturday Night |
Snow Level 8500' (Easterly Flow *) |
| Sunday Morning |
Snow Level 8000' (Easterly Flow *) |
| Sunday Mid-day |
Snow Level 6500' |
| Sunday Afternoon |
Snow Level 4500' |
| Sunday Night |
Snow Level 3500' |
* 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
| Monday | Monday | |
|---|---|---|
| Hurricane Ridge | 0.50 - 0.75 | 0 - 1.00 |
| Mt Baker Ski Area | 0 - 1.50 | 2.00 - 3.00 |
| Washington Pass | 0.25 - 0.50 | 0.75 - 1.00 |
| Stevens Pass | LT 0.25 | 0 - 0.75 |
| Snoqualmie Pass | 0 - 0.50 | 0 - 0.75 |
| Mission Ridge | LT 0.25 | LT 0.25 |
| Crystal Mt | 0.50 - 0.75 | 0 - 1.00 |
| Paradise | 0.50 - 0.75 | 1.00 - 1.50 |
| White Pass | LT 0.25 | 0 - 0.50 |
| Mt Hood Meadows | LT 0.10 | 0 - 0.50 |
| Timberline | LT 0.25 | 0.50 - 0.75 |
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: 2:13 PM PST Saturday, November 25, 2017
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Saturday Afternoon | SE 10 - 20 | SE 5 - 15 | ESE 10 - 20 | --- - | SE 10 - 20 |
| Saturday Night | S 25 - 35 | SE 15 - 30 | ESE 20 - 30 | --- - | S 20 - 30 |
| Sunday Morning | S 30 - 50 | S 20 - 30 | SE 15 - 30 | --- - | S 20 - 30 |
| Sunday Afternoon | SW 25 - 40 | SW 25 - 35 | SW 20 - 35 | --- - | SW 30 - 40 |
| Sunday Night | W 15 - 30 | S 15 - 25 | WSW 20 - 35 | --- - | WSW 20 - 30 |
| Hurricane Ridge | Elevation |
|---|---|
| Saturday Afternoon | SE 10 - 20 |
| Saturday Night | S 25 - 35 |
| Sunday Morning | S 30 - 50 |
| Sunday Afternoon | SW 25 - 40 |
| Sunday Night | W 15 - 30 |
| Mt. Baker | Elevation |
|---|---|
| Saturday Afternoon | SE 5 - 15 |
| Saturday Night | SE 15 - 30 |
| Sunday Morning | S 20 - 30 |
| Sunday Afternoon | SW 25 - 35 |
| Sunday Night | S 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Saturday Afternoon | ESE 10 - 20 |
| Saturday Night | ESE 20 - 30 |
| Sunday Morning | SE 15 - 30 |
| Sunday Afternoon | SW 20 - 35 |
| Sunday Night | WSW 20 - 35 |
| Mt. Rainier | Elevation |
|---|---|
| Saturday Afternoon | --- - |
| Saturday Night | --- - |
| Sunday Morning | --- - |
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Saturday Afternoon | SE 10 - 20 |
| Saturday Night | S 20 - 30 |
| Sunday Morning | S 20 - 30 |
| Sunday Afternoon | SW 30 - 40 |
| Sunday Night | WSW 20 - 30 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Saturday Afternoon | SE 10 - 20 |
| Saturday Night | S 25 - 35 |
| Sunday Morning | S 30 - 50 |
| Sunday Afternoon | SW 25 - 40 |
| Sunday Night | W 15 - 30 |
| Mt. Baker | Direction - Speed |
|---|---|
| Saturday Afternoon | SE 5 - 15 |
| Saturday Night | SE 15 - 30 |
| Sunday Morning | S 20 - 30 |
| Sunday Afternoon | SW 25 - 35 |
| Sunday Night | S 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Saturday Afternoon | ESE 10 - 20 |
| Saturday Night | ESE 20 - 30 |
| Sunday Morning | SE 15 - 30 |
| Sunday Afternoon | SW 20 - 35 |
| Sunday Night | WSW 20 - 35 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Saturday Afternoon | --- - |
| Saturday Night | --- - |
| Sunday Morning | --- - |
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Saturday Afternoon | SE 10 - 20 |
| Saturday Night | S 20 - 30 |
| Sunday Morning | S 20 - 30 |
| Sunday Afternoon | SW 30 - 40 |
| Sunday Night | WSW 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 | |
|---|---|---|---|---|---|
| Saturday Afternoon | SSW 30 - 40 | SSW 20 - 30 | S 30 - 40 | --- - | SW 40 - 50 |
| Saturday Night | SW 55 - 70 | SW 30 - 40 | SW 55 - 70 | --- - | SW 60 - 80 |
| Sunday Morning | SW 55 - 70 | SW 35 - 45 | SW 55 - 70 | --- - | SW 70 - 90 |
| Sunday Afternoon | SW 40 - 50 | SW 40 - 50 | SW 45 - 60 | --- - | SW 50 - 60 |
| Sunday Night | SW 30 - 40 | SW 50 - 60 | SW 40 - 55 | --- - | SW 35 - 45 |
| Mt. Baker | Direction - Speed |
|---|---|
| Saturday Afternoon | SSW 30 - 40 |
| Saturday Night | SW 55 - 70 |
| Sunday Morning | SW 55 - 70 |
| Sunday Afternoon | SW 40 - 50 |
| Sunday Night | SW 30 - 40 |
| Washington Pass | Direction - Speed |
|---|---|
| Saturday Afternoon | SSW 20 - 30 |
| Saturday Night | SW 30 - 40 |
| Sunday Morning | SW 35 - 45 |
| Sunday Afternoon | SW 40 - 50 |
| Sunday Night | SW 50 - 60 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Saturday Afternoon | S 30 - 40 |
| Saturday Night | SW 55 - 70 |
| Sunday Morning | SW 55 - 70 |
| Sunday Afternoon | SW 45 - 60 |
| Sunday Night | SW 40 - 55 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Saturday Afternoon | --- - |
| Saturday Night | --- - |
| Sunday Morning | --- - |
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Saturday Afternoon | SW 40 - 50 |
| Saturday Night | SW 60 - 80 |
| Sunday Morning | SW 70 - 90 |
| Sunday Afternoon | SW 50 - 60 |
| Sunday Night | SW 35 - 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: 2:13 PM PST Saturday, November 25, 2017
Extended Weather Synopsis for Monday night through Monday
On Monday, leftover showers and onshore flow will keep the west slopes of the Cascades cloudy despite flat ridging building over the West Coast. Clouds and showers will diminish further east of the crest. A fast moving frontal system will approach Monday night and sweep through the area by mid-day Tuesday. There should be a slight warming trend with only a modest bump in snow levels early Tuesday morning before snow levels drop back down Tuesday afternoon. We might actually be in for a dry day on Wednesday as strong upper level ridging builds aloft.
Extended Weather
Olympics, Washington Cascades and Mt. Hood Area
Cloudy with scattered light showers Olympics, west slopes of the Cascades and Mt. Hood. Mostly cloudy east slopes of the Cascades. Rain and snow developing overnight with a slight warming trend late Monday night.
Light to moderate rain and snow becoming light to moderate rain and snow showers mid-day. Cooling trend beginning mid-day. Showers decreasing Tuesday night.
Partly to mostly cloudy.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Monday | Snow Level | 2000' - 3000' | 2500' - 3500' | 3000' - 4000' | |
| Monday Night | Snow Level | 3000' - 4000' | 3500' - 4500' | 4000' - 5000' | * |
| Tuesday | Snow Level | 3000' - 4000' | 3000' - 4000' | 3500' - 4500' | |
| Tuesday Night | Snow Level | 2500' - 3500' | 2500' - 3500' | 3000' - 4000' | |
| Wednesday | Freezing Level | 3500' - 4500' | 4000' - 5000' | 5000' - 6000' |
| Mt. Baker | Elevation |
|---|---|
| Monday |
Snow Level 2000' - 3000' |
| Monday Night |
Snow Level 3000' - 4000' (Easterly Flow *) |
| Tuesday |
Snow Level 3000' - 4000' |
| Tuesday Night |
Snow Level 2500' - 3500' |
| Wednesday |
Freezing Level 3500' - 4500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday |
Snow Level 2500' - 3500' |
| Monday Night |
Snow Level 3500' - 4500' (Easterly Flow *) |
| Tuesday |
Snow Level 3000' - 4000' |
| Tuesday Night |
Snow Level 2500' - 3500' |
| Wednesday |
Freezing Level 4000' - 5000' |
| Mt. Hood | Elevation |
|---|---|
| Monday |
Snow Level 3000' - 4000' |
| Monday Night |
Snow Level 4000' - 5000' (Easterly Flow *) |
| Tuesday |
Snow Level 3500' - 4500' |
| Tuesday Night |
Snow Level 3000' - 4000' |
| Wednesday |
Freezing Level 5000' - 6000' |
* 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 25, 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.