Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Sunday & Monday
A Pacific frontal system offshore should continue to spread light snow over the Olympics and Cascades today, with precipitation becoming steadier in the afternoon. As the main energy with the associated trough dives into California, the front will slow and weaken in the evening, with a gradual shift to westerly winds in the Cascade Passes early Monday morning. No significant temperature trends are expected with this system.
Weak NW flow aloft on Monday should maintain ample moisture and cloud cover along the west slopes along with leftover and predominately light snow showers. Snow showers should taper down Monday night as weak ridging builds offshore.
Weather Forecast
Olympics, Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Sunday Afternoon - Sunday Evening |
Light to occasionally moderate snow becoming showers in the evening. |
| Sunday Night - Monday Night |
Cloudy with light snow showers. Showers becoming scattered by Monday afternoon and decreasing Monday night. |
East slopes of the Washington Cascades
| Sunday |
Cloudy with light snow increasing during the afternoon. |
| Sunday Night - Monday Night |
Mostly cloudy with light snow showers. Showers becoming scattered by Monday afternoon and decreasing Monday night along with partial clearing. |
Mt. Hood Area
| Sunday Afternoon - Sunday Evening |
Light snow developing in the afternoon. |
| Sunday Night - Monday Night |
Cloudy with light snow showers. |
Issued: 2:09 PM PST Sunday, December 27, 2015
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Sunday Afternoon - Sunday | Snow Level * | 3500' | 2500' | 1000' | ' | ' | 1500' | ' | 2500' |
| Sunday Night - Monday Night | Snow Level | 2000' | 1500' | 1500' | ' | ' | 1500' | ' | 2500' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Afternoon - Sunday |
Snow Level 3500' (Easterly Flow *) |
| Sunday Night - Monday Night |
Snow Level 2000' |
| Mt. Baker | Elevation |
|---|---|
| Sunday Afternoon - Sunday |
Snow Level 2500' (Easterly Flow *) |
| Sunday Night - Monday Night |
Snow Level 1500' |
| Washington Pass | Elevation |
|---|---|
| Sunday Afternoon - Sunday |
Snow Level 1000' (Easterly Flow *) |
| Sunday Night - Monday Night |
Snow Level 1500' |
| Leavenworth | Elevation |
|---|---|
| Sunday Afternoon - Sunday |
Snow Level ' (Easterly Flow *) |
| Sunday Night - Monday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Sunday Afternoon - Sunday |
Snow Level ' (Easterly Flow *) |
| Sunday Night - Monday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Afternoon - Sunday |
Snow Level 1500' (Easterly Flow *) |
| Sunday Night - Monday Night |
Snow Level 1500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Afternoon - Sunday |
Snow Level ' (Easterly Flow *) |
| Sunday Night - Monday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Sunday Afternoon - Sunday |
Snow Level 2500' (Easterly Flow *) |
| Sunday Night - Monday Night |
Snow Level 2500' |
* 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 | 0.25 - 0.50 | LT 0.25 |
| Mt Baker Ski Area | 0 - 0.50 | LT 0.10 |
| Washington Pass | LT 0.25 | LT 0.10 |
| Stevens Pass | 0.25 - 0.50 | LT 0.25 |
| Snoqualmie Pass | 0 - 0.50 | LT 0.25 |
| Mission Ridge | LT 0.25 | LT 0.10 |
| Crystal Mt | 0.25 - 0.50 | LT 0.10 |
| Paradise | 0 - 0.75 | LT 0.10 |
| White Pass | 0.25 - 0.50 | LT 0.10 |
| Mt Hood Meadows | 0.50 - 0.75 | LT 0.25 |
| Timberline | 0 - 0.75 | LT 0.10 |
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: 2:09 PM PST Sunday, December 27, 2015
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday | SSW 15 - 25 | S 5 - 15 | SE 10 - 20 | --- - | SW 10 - 20 |
| Sunday Night - Monday Night | NW 0 - 10 | NW 0 - 10 | NW 0 - 10 | --- - | WNW 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday | SSW 15 - 25 |
| Sunday Night - Monday Night | NW 0 - 10 |
| Mt. Baker | Elevation |
|---|---|
| Sunday | S 5 - 15 |
| Sunday Night - Monday Night | NW 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday | SE 10 - 20 |
| Sunday Night - Monday Night | NW 0 - 10 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday | --- - |
| Sunday Night - Monday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Sunday | SW 10 - 20 |
| Sunday Night - Monday Night | WNW 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday | SSW 15 - 25 |
| Sunday Night - Monday Night | NW 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday | S 5 - 15 |
| Sunday Night - Monday Night | NW 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday | SE 10 - 20 |
| Sunday Night - Monday Night | NW 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday | --- - |
| Sunday Night - Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday | SW 10 - 20 |
| Sunday Night - Monday Night | WNW 5 - 15 |
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 | |
|---|---|---|---|---|---|
| Sunday Mid-day | SW 20 - 30 | SW 20 - 30 | SW 25 - 35 | --- - | W 25 - 35 |
| Sunday Afternoon | SW 10 - 20 | SW 10 - 20 | SW 15 - 25 | --- - | W 10 - 20 |
| Sunday Night | W 5 - 15 | W 5 - 15 | W 10 - 20 | --- - | W 10 - 20 |
| Monday | NW 10 - 20 | NW 5 - 15 | NW 15 - 25 | --- - | NW 15 - 25 |
| Monday Night | NW 0 - 10 | NW 0 - 10 | NW 0 - 10 | --- - | NW 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Mid-day | SW 20 - 30 |
| Sunday Afternoon | SW 10 - 20 |
| Sunday Night | W 5 - 15 |
| Monday | NW 10 - 20 |
| Monday Night | NW 0 - 10 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Mid-day | SW 20 - 30 |
| Sunday Afternoon | SW 10 - 20 |
| Sunday Night | W 5 - 15 |
| Monday | NW 5 - 15 |
| Monday Night | NW 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Mid-day | SW 25 - 35 |
| Sunday Afternoon | SW 15 - 25 |
| Sunday Night | W 10 - 20 |
| Monday | NW 15 - 25 |
| Monday Night | NW 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Mid-day | --- - |
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday | --- - |
| Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Mid-day | W 25 - 35 |
| Sunday Afternoon | W 10 - 20 |
| Sunday Night | W 10 - 20 |
| Monday | NW 15 - 25 |
| Monday Night | NW 10 - 20 |
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: 2:09 PM PST Sunday, December 27, 2015
Extended Weather Synopsis for Monday night through Monday
The last low pressure system for awhile is forecast to slide down in NW flow toward Oregon later Tuesday or Tuesday night. Light snow may glance the Olympics and central/south Washington Cascades, largely missing the north Cascades...but this system should predominately affect Mt. Hood.
Upper level ridging will quickly build around 135 W on Wednesday, leading to a quick drying trend as the flow aloft becomes more northerly. As upper level high pressure takes hold by Thursday, freezing levels will begin to rise west of the crest into the 8000+ range. Strong surface high pressure in the interior West and the resulting offshore flow will keep freezing levels lower along the east slopes, through the Passes and near the crest.
Extended Weather
Olympics, Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes and Mt. Hood
Mostly cloudy with isolated snow showers mainly near and west the crest. Increasing clouds Olympics.
Mostly cloudy north Cascades. Cloudy with light snow south Washington Cascades and Mt. Hood.
Mostly cloudy in the morning, becoming mostly clear in the afternoon.
Mostly sunny. Warmer west slopes away from the Cascade Passes.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Tuesday - Tuesday Night | Snow Level | 500' - 1500' | 500' - 1500' | 1000' - 2000' | * |
| Wednesday - Wednesday Night | Freezing Level | 1000' - 2000' | 500' - 1500' | 1500' - 2500' | * |
| Thursday | Snow Level | 6000' - 7000' | 5500' - 6500' | 5500' - 6500' | * |
| Mt. Baker | Elevation |
|---|---|
| Tuesday - Tuesday Night |
Snow Level 500' - 1500' (Easterly Flow *) |
| Wednesday - Wednesday Night |
Freezing Level 1000' - 2000' (Easterly Flow *) |
| Thursday |
Snow Level 6000' - 7000' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday - Tuesday Night |
Snow Level 500' - 1500' (Easterly Flow *) |
| Wednesday - Wednesday Night |
Freezing Level 500' - 1500' (Easterly Flow *) |
| Thursday |
Snow Level 5500' - 6500' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Tuesday - Tuesday Night |
Snow Level 1000' - 2000' (Easterly Flow *) |
| Wednesday - Wednesday Night |
Freezing Level 1500' - 2500' (Easterly Flow *) |
| Thursday |
Snow Level 5500' - 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.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Previous forecast from Dec 27, 2015
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