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 & Saturday
An upper level ridge will park itself over the Baja Peninsula/Southern California and help direct a series of warm and wet weather systems into the Pacific Northwest and British Columbia over much of the week.
Moist SW flow will carry warm frontal precipitation over the region on Tuesday with precipitation rates and snow levels quickly ramping up during the day along with alpine winds. Moderate to locally heavy precipitation should continue Tuesday night. Moderate easterly flow through the Cascade Passes may initially allow for a brief period of snow Tuesday morning before quickly changing to rain. In the same vein, the NE Cascades including Washington Pass will be slower to warm Tuesday but rain should eventually push into the 6000-7000 ft range Tuesday night.
Weather Forecast
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Monday Afternoon |
Mostly cloudy with scattered light rain and snow showers, except locally moderate in a Puget Sound Convergence Zone. |
| Monday Night |
Partly to mostly cloudy with a chance of light rain and snow showers. |
| Tuesday |
Light rain and snow developing over the south Washington Cascades and spreading north by mid-day. Rain and snow becoming moderate to locally heavy mid-day through the afternoon. Strong warming trend. Increasing alpine winds. |
| Tuesday Night |
Stormy and mild in the evening becoming cloudy with light to occasionally moderate rain and snow showers after midnight. |
Olympics
| Monday Afternoon |
Mostly cloudy with scattered light rain and snow showers. |
| Monday Night |
Partly to mostly cloudy with a chance of light rain and snow showers. |
| Tuesday |
Light rain and snow developing in the morning. Rain and snow becoming moderate to locally heavy by mid-day. Strong warming trend. Increasing alpine winds. |
| Tuesday Night |
Stormy and mild in the early evening becoming cloudy with light to occasionally moderate rain and snow showers by later in the evening. |
East slopes of the Washington Cascades
| Monday Afternoon |
Mostly cloudy with scattered light rain and snow showers near the crest. Partly cloudy further east. |
| Monday Night |
Partly to mostly cloudy. |
| Tuesday |
Light rain and snow developing over the south Washington Cascades and spreading north by mid-day. Rain and snow becoming light to moderate mid-day through the afternoon. Slow warming trend. Increasing alpine winds. |
| Tuesday Night |
Stormy and mild in the evening becoming cloudy with light to occasionally moderate rain and snow showers after midnight. Warming trend continuing. |
Mt. Hood Area
| Monday Afternoon |
Mostly cloudy with scattered light rain and snow showers. |
| Monday Night |
Partly to mostly cloudy with a chance of light rain and snow showers in the evening. Light rain and snow developing after midnight. Strong warming trend. |
| Tuesday |
Light to moderate rain and snow. Mild. Increasing alpine winds. |
| Tuesday Night |
Mostly cloudy with light rain and snow showers. Mild. |
Issued: 4:44 PM PST Monday, November 20, 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 | 3500' | 3500' | 3500' | ' | ' | 3500' | ' | 4500' |
| Monday Night | Snow Level | 5000' | 3500' | 3500' | ' | ' | 4000' | ' | 5500' |
| Tuesday Afternoon | Snow Level | 7000' | 6500' | 5500' | ' | ' | 6500' | ' | 7000' |
| Tuesday Night | Snow Level | 6500' | 6500' | 6500' | ' | ' | 7000' | ' | 7500' |
| Tuesday Morning | Snow Level * | 6000' | 4000' | 4000' | ' | ' | 4500' | ' | 6500' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3500' |
| Monday Night |
Snow Level 5000' |
| Tuesday Afternoon |
Snow Level 7000' |
| Tuesday Night |
Snow Level 6500' |
| Tuesday Morning |
Snow Level 6000' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3500' |
| Monday Night |
Snow Level 3500' |
| Tuesday Afternoon |
Snow Level 6500' |
| Tuesday Night |
Snow Level 6500' |
| Tuesday Morning |
Snow Level 4000' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3500' |
| Monday Night |
Snow Level 3500' |
| Tuesday Afternoon |
Snow Level 5500' |
| Tuesday Night |
Snow Level 6500' |
| Tuesday Morning |
Snow Level 4000' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Tuesday Morning |
Snow Level ' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Tuesday Morning |
Snow Level ' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3500' |
| Monday Night |
Snow Level 4000' |
| Tuesday Afternoon |
Snow Level 6500' |
| Tuesday Night |
Snow Level 7000' |
| Tuesday Morning |
Snow Level 4500' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Tuesday Morning |
Snow Level ' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 4500' |
| Monday Night |
Snow Level 5500' |
| Tuesday Afternoon |
Snow Level 7000' |
| Tuesday Night |
Snow Level 7500' |
| Tuesday Morning |
Snow Level 6500' (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
| Saturday | Saturday | |
|---|---|---|
| Hurricane Ridge | 0.25 - 0.50 | 1.00 - 1.50 |
| Mt Baker Ski Area | 0 - 0.50 | 0 - 2.00 |
| Washington Pass | 0.25 - 0.50 | 1.00 - 1.50 |
| Stevens Pass | 0 - 0.75 | 0 - 2.00 |
| Snoqualmie Pass | 1.00 - 1.50 | 0 - 2.50 |
| Mission Ridge | 0.25 - 0.50 | 0.75 - 1.00 |
| Crystal Mt | 0.75 - 1.00 | 2.00 - 2.50 |
| Paradise | 0 - 2.00 | 4.00 - 5.00 |
| White Pass | 0.75 - 1.00 | 1.00 - 1.50 |
| Mt Hood Meadows | 0 - 1.50 | 0 - 0.75 |
| Timberline | 2.00 - 2.50 | 0 - 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: 4:44 PM PST Monday, November 20, 2017
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Afternoon | W 0 - 10 | WSW 0 - 10 | WSW 10 - 20 | --- - | WSW 10 - 20 |
| Monday Night | SE 5 - 15 | SE 0 - 10 | SE 0 - 10 | --- - | SW 20 - 30 |
| Tuesday Morning | SE 10 - 20 | ESE 5 - 15 | SE 10 - 20 | --- - | S 15 - 25 |
| Tuesday Afternoon | SSW 15 - 30 | S 15 - 30 | SSE 15 - 30 | --- - | SW 25 - 35 |
| Tuesday Night | S 10 - 20 | SSW 15 - 25 | SW 10 - 20 | --- - | S 15 - 25 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon | W 0 - 10 |
| Monday Night | SE 5 - 15 |
| Tuesday Morning | SE 10 - 20 |
| Tuesday Afternoon | SSW 15 - 30 |
| Tuesday Night | S 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon | WSW 0 - 10 |
| Monday Night | SE 0 - 10 |
| Tuesday Morning | ESE 5 - 15 |
| Tuesday Afternoon | S 15 - 30 |
| Tuesday Night | SSW 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon | WSW 10 - 20 |
| Monday Night | SE 0 - 10 |
| Tuesday Morning | SE 10 - 20 |
| Tuesday Afternoon | SSE 15 - 30 |
| Tuesday Night | SW 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon | WSW 10 - 20 |
| Monday Night | SW 20 - 30 |
| Tuesday Morning | S 15 - 25 |
| Tuesday Afternoon | SW 25 - 35 |
| Tuesday Night | S 15 - 25 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Afternoon | W 0 - 10 |
| Monday Night | SE 5 - 15 |
| Tuesday Morning | SE 10 - 20 |
| Tuesday Afternoon | SSW 15 - 30 |
| Tuesday Night | S 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | WSW 0 - 10 |
| Monday Night | SE 0 - 10 |
| Tuesday Morning | ESE 5 - 15 |
| Tuesday Afternoon | S 15 - 30 |
| Tuesday Night | SSW 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | WSW 10 - 20 |
| Monday Night | SE 0 - 10 |
| Tuesday Morning | SE 10 - 20 |
| Tuesday Afternoon | SSE 15 - 30 |
| Tuesday Night | SW 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | WSW 10 - 20 |
| Monday Night | SW 20 - 30 |
| Tuesday Morning | S 15 - 25 |
| Tuesday Afternoon | SW 25 - 35 |
| Tuesday Night | S 15 - 25 |
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 | SW 5 - 15 | W 10 - 20 | W 20 - 30 | --- - | W 50 - 60 |
| Monday Night | SW 15 - 25 | SW 20 - 30 | SW 25 - 35 | --- - | SW 30 - 40 |
| Tuesday Morning | SSW 25 - 35 | SW 20 - 30 | SW 30 - 40 | --- - | SW 55 - 65 |
| Tuesday Afternoon | SW 50 - 60 | SW 50 - 60 | SW 55 - 65 | --- - | SW 50 - 60 |
| Tuesday Night | SW 20 - 30 | SW 40 - 50 | SW 35 - 45 | --- - | SW 35 - 45 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | SW 5 - 15 |
| Monday Night | SW 15 - 25 |
| Tuesday Morning | SSW 25 - 35 |
| Tuesday Afternoon | SW 50 - 60 |
| Tuesday Night | SW 20 - 30 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Afternoon | W 10 - 20 |
| Monday Night | SW 20 - 30 |
| Tuesday Morning | SW 20 - 30 |
| Tuesday Afternoon | SW 50 - 60 |
| Tuesday Night | SW 40 - 50 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | W 20 - 30 |
| Monday Night | SW 25 - 35 |
| Tuesday Morning | SW 30 - 40 |
| Tuesday Afternoon | SW 55 - 65 |
| Tuesday Night | SW 35 - 45 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | W 50 - 60 |
| Monday Night | SW 30 - 40 |
| Tuesday Morning | SW 55 - 65 |
| Tuesday Afternoon | SW 50 - 60 |
| Tuesday 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: 4:44 PM PST Monday, November 20, 2017
Extended Weather Synopsis for Saturday night through Saturday
Another wave of moisture in SW flow will traverse across the area on Wednesday before the main frontal band associated with the deep upper level trough offshore begins to sag SE across the Cascades Wednesday night.
Strong westerly flow and the trailing upper level trough will keep the weather active on Thanksgiving. Snow levels should drop uniformly across the PNW to 4000-5000 feet by Thursday afternoon as cooler air moves into the region. Unfortunately the same upper level ridge will quickly rebuild in place Friday, likely setting the stage for milder moist SW flow to return for the first half of the weekend.
Extended Weather
Olympics, Washington Cascades and Mt. Hood Area
Cloudy with periods of light to moderate rain and snow becoming heavier overnight. Mild. Windy in the alpine.
Stormy Thursday morning then light to occasionally moderate rain and snow showers. Slow cooling trend during the day. Breezy.
Cloudy with periods of light rain and snow.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Wednesday | Snow Level | 6000' - 7000' | 6000' - 7500' | 7000' - 8000' | |
| Wednesday Night | Snow Level | 6000' - 7000' | 6000' - 7500' | 7000' - 8000' | |
| Thursday | Snow Level | 4000' - 6000' | 4500' - 6000' | 5500' - 7000' | |
| Thursday Night | Snow Level | 3500' - 4500' | 3500' - 4500' | 3500' - 4500' | |
| Friday | Snow Level | 4000' - 5000' | 4000' - 5000' | 5500' - 6500' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday |
Snow Level 6000' - 7000' |
| Wednesday Night |
Snow Level 6000' - 7000' |
| Thursday |
Snow Level 4000' - 6000' |
| Thursday Night |
Snow Level 3500' - 4500' |
| Friday |
Snow Level 4000' - 5000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday |
Snow Level 6000' - 7500' |
| Wednesday Night |
Snow Level 6000' - 7500' |
| Thursday |
Snow Level 4500' - 6000' |
| Thursday Night |
Snow Level 3500' - 4500' |
| Friday |
Snow Level 4000' - 5000' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday |
Snow Level 7000' - 8000' |
| Wednesday Night |
Snow Level 7000' - 8000' |
| Thursday |
Snow Level 5500' - 7000' |
| Thursday Night |
Snow Level 3500' - 4500' |
| Friday |
Snow Level 5500' - 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.
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 17, 2017
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