Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Weather Synopsis for Monday & Tuesday
Strong westerly flow will deliver a one-two punch of weather systems over the next 36 hours, with the second storm arriving tonight being the stronger of the two. Light to moderate snow from the first weather system is over us this morning. The front should be through the area by late morning with post-front shower activity quickly decreasing in the early afternoon. A quick pop-up in temperatures this morning should become a more gradual rise this afternoon. Snow levels look to rise above Pass level for Snoqualmie and near Pass level for White but should stay below Pass level (4000 ft) for Stevens with this first system. Strong westerly winds seen this morning should also ease this afternoon.
The next system currently upstream in westerly flow will quickly move in this evening with precipitation becoming moderate to locally heavy for the south Washington Cascades and Mt. Hood Monday night. Westerly winds will be even stronger with this system and stay strong for much of Tuesday. The heaviest precipitation will also coincide with the strongest warming late tonight. Warm air should work into White and Snoqualmie Passes in the early morning hours changing snow to rain, while Stevens will likely stay all snow until after the frontal passage a few hours later. The warming trend will be less dramatic for the north Cascades with this system versus the south Cascades and Mt. Hood.
However, warming will be brief as snow levels come crashing back down by mid-day Tuesday and settle around 2500 feet as moderate showers for the west slopes of the Cascades and Mt. Hood quickly taper down Tuesday night.
Weather Forecast
Olympics, Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Monday Morning |
Moderate rain and snow transitioning to light to moderate showers late morning. Warming trend. Strong westerly winds. |
| Monday Afternoon |
Mostly cloudy with scattered light rain and and snow showers. |
| Monday Night |
Increasing moderate to locally heavy rain and snow. Warming trend initially outside of the Cascade Passes and north Cascades. Becoming very windy. |
| Tuesday Morning |
Moderate to locally heavy rain and snow transitioning to light to moderate rain and snow showers late morning. Very windy. Warmer. |
| Tuesday Mid-day - Tuesday Afternoon |
Light to moderate rain and snow showers. Windy. Rapid cooling trend. |
| Tuesday Night |
Partly to mostly cloudy with light rain and snow showers ending overnight. |
Mt. Hood Area
| Monday Morning |
Moderate rain and snow transitioning to light to moderate showers late morning. Warming trend. Strong westerly winds. |
| Monday Afternoon |
Mostly cloudy with scattered light rain and and snow showers. |
| Monday Night |
Increasing moderate to heavy rain and snow. Warming trend. Becoming very windy. |
| Tuesday Morning |
Moderate to locally heavy rain and snow transitioning to light to moderate rain and snow showers late morning. Very windy. |
| Tuesday Mid-day - Tuesday Afternoon |
Light to moderate rain and snow showers. Windy. Rapid cooling trend. |
| Tuesday Night |
Partly to mostly cloudy with light rain and snow showers ending overnight. |
East slopes of the Washington Cascades
| Monday Morning |
Light to moderate rain and snow transitioning to light showers late morning. Slight warming trend. Strong westerly winds at crest level. |
| Monday Afternoon |
Partly to mostly cloudy with scattered light rain and and snow showers. |
| Monday Night |
Increasing light to moderate rain and snow. Becoming very windy. |
| Tuesday Morning |
Moderate rain and snow transitioning to light rain and snow showers late morning. Very windy. Warming trend. |
| Tuesday Mid-day - Tuesday Afternoon |
Mostly cloudy with light rain and snow showers, except occasionally moderate near the Cascade crest. Windy. Rapid cooling trend. |
| Tuesday Night |
Partly cloudy with light rain and snow showers ending overnight. |
Issued: 7:32 AM PST Monday, December 19, 2016
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 * | 3500' | 1500' | 1000' | ' | ' | 1500' | ' | 2500' |
| Monday Mid-day | Snow Level | 3500' | 3000' | 2500' | ' | ' | 3500' | ' | 4000' |
| Monday Afternoon | Snow Level | 5500' | 2500' | 1500' | ' | ' | 4000' | ' | 5500' |
| Monday Night | Snow Level * | 4500' | 2000' | 1500' | ' | ' | 3000' | ' | 6500' |
| Tuesday Morning | Snow Level | 4500' | 4000' | 3000' | ' | ' | 4500' | ' | 6000' |
| Tuesday Mid-day - Tuesday Night | Snow Level | 3000' | 2500' | 2500' | ' | ' | 2500' | ' | 2500' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Morning |
Snow Level 3500' (Easterly Flow *) |
| Monday Mid-day |
Snow Level 3500' |
| Monday Afternoon |
Snow Level 5500' |
| Monday Night |
Snow Level 4500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 4500' |
| Tuesday Mid-day - Tuesday Night |
Snow Level 3000' |
| Mt. Baker | Elevation |
|---|---|
| Monday Morning |
Snow Level 1500' (Easterly Flow *) |
| Monday Mid-day |
Snow Level 3000' |
| Monday Afternoon |
Snow Level 2500' |
| Monday Night |
Snow Level 2000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 4000' |
| Tuesday Mid-day - Tuesday Night |
Snow Level 2500' |
| Washington Pass | Elevation |
|---|---|
| Monday Morning |
Snow Level 1000' (Easterly Flow *) |
| Monday Mid-day |
Snow Level 2500' |
| Monday Afternoon |
Snow Level 1500' |
| Monday Night |
Snow Level 1500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 3000' |
| Tuesday Mid-day - Tuesday Night |
Snow Level 2500' |
| Leavenworth | Elevation |
|---|---|
| Monday Morning |
Snow Level ' (Easterly Flow *) |
| Monday Mid-day |
Snow Level ' |
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Tuesday Morning |
Snow Level ' |
| Tuesday Mid-day - Tuesday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Monday Morning |
Snow Level ' (Easterly Flow *) |
| Monday Mid-day |
Snow Level ' |
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Tuesday Morning |
Snow Level ' |
| Tuesday Mid-day - Tuesday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Morning |
Snow Level 1500' (Easterly Flow *) |
| Monday Mid-day |
Snow Level 3500' |
| Monday Afternoon |
Snow Level 4000' |
| Monday Night |
Snow Level 3000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 4500' |
| Tuesday Mid-day - Tuesday Night |
Snow Level 2500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Morning |
Snow Level ' (Easterly Flow *) |
| Monday Mid-day |
Snow Level ' |
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Tuesday Morning |
Snow Level ' |
| Tuesday Mid-day - Tuesday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Monday Morning |
Snow Level 2500' (Easterly Flow *) |
| Monday Mid-day |
Snow Level 4000' |
| Monday Afternoon |
Snow Level 5500' |
| Monday Night |
Snow Level 6500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 6000' |
| Tuesday Mid-day - Tuesday 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
| Tuesday | Tuesday | |
|---|---|---|
| Hurricane Ridge | 0.50 - 0.75 | 0.25 - 0.50 |
| Mt Baker Ski Area | 0 - 1.00 | 1.00 - 1.50 |
| Washington Pass | 0.50 - 0.75 | 0.75 - 1.00 |
| Stevens Pass | 1.50 - 2.00 | 0 - 1.00 |
| Snoqualmie Pass | 0 - 2.00 | 0 - 1.00 |
| Mission Ridge | 0.50 - 0.75 | LT 0.25 |
| Crystal Mt | 1.00 - 1.50 | 0.25 - 0.50 |
| Paradise | 2.50 - 3.50 | 1.00 - 1.50 |
| White Pass | 1.50 - 2.00 | 0.75 - 1.00 |
| Mt Hood Meadows | 2.00 - 3.00 | 0 - 0.75 |
| Timberline | 2.50 - 3.50 | 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: 7:32 AM PST Monday, December 19, 2016
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Morning | SW 30 - 40 | SW 25 - 35 | SW 35 - 45 | --- - | SW 20 - 30 |
| Monday Mid-day | WNW 15 - 25 | W 15 - 25 | WSW 25 - 40 | --- - | WSW 35 - 45 |
| Monday Afternoon | SW 5 - 15 | SW 5 - 15 | SW 15 - 30 | --- - | WSW 20 - 30 |
| Monday Night | WSW 30 - 40 | SW 20 - 30 | WSW 25 - 40 | --- - | WSW 40 - 50 |
| Tuesday Morning | W 40 - 50 | W 30 - 40 | W 35 - 50 | --- - | WNW 30 - 40 |
| Tuesday Afternoon | NW 30 - 40 | W 25 - 35 | W 35 - 45 | --- - | WNW 30 - 40 |
| Tuesday Night | W 10 - 20 | W 10 - 20 | W 10 - 20 | --- - | WNW 10 - 20 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Morning | SW 30 - 40 |
| Monday Mid-day | WNW 15 - 25 |
| Monday Afternoon | SW 5 - 15 |
| Monday Night | WSW 30 - 40 |
| Tuesday Morning | W 40 - 50 |
| Tuesday Afternoon | NW 30 - 40 |
| Tuesday Night | W 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Monday Morning | SW 25 - 35 |
| Monday Mid-day | W 15 - 25 |
| Monday Afternoon | SW 5 - 15 |
| Monday Night | SW 20 - 30 |
| Tuesday Morning | W 30 - 40 |
| Tuesday Afternoon | W 25 - 35 |
| Tuesday Night | W 10 - 20 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Morning | SW 35 - 45 |
| Monday Mid-day | WSW 25 - 40 |
| Monday Afternoon | SW 15 - 30 |
| Monday Night | WSW 25 - 40 |
| Tuesday Morning | W 35 - 50 |
| Tuesday Afternoon | W 35 - 45 |
| Tuesday Night | W 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Morning | --- - |
| Monday Mid-day | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Monday Morning | SW 20 - 30 |
| Monday Mid-day | WSW 35 - 45 |
| Monday Afternoon | WSW 20 - 30 |
| Monday Night | WSW 40 - 50 |
| Tuesday Morning | WNW 30 - 40 |
| Tuesday Afternoon | WNW 30 - 40 |
| Tuesday Night | WNW 10 - 20 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Morning | SW 30 - 40 |
| Monday Mid-day | WNW 15 - 25 |
| Monday Afternoon | SW 5 - 15 |
| Monday Night | WSW 30 - 40 |
| Tuesday Morning | W 40 - 50 |
| Tuesday Afternoon | NW 30 - 40 |
| Tuesday Night | W 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Morning | SW 25 - 35 |
| Monday Mid-day | W 15 - 25 |
| Monday Afternoon | SW 5 - 15 |
| Monday Night | SW 20 - 30 |
| Tuesday Morning | W 30 - 40 |
| Tuesday Afternoon | W 25 - 35 |
| Tuesday Night | W 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Morning | SW 35 - 45 |
| Monday Mid-day | WSW 25 - 40 |
| Monday Afternoon | SW 15 - 30 |
| Monday Night | WSW 25 - 40 |
| Tuesday Morning | W 35 - 50 |
| Tuesday Afternoon | W 35 - 45 |
| Tuesday Night | W 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Morning | --- - |
| Monday Mid-day | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Morning | SW 20 - 30 |
| Monday Mid-day | WSW 35 - 45 |
| Monday Afternoon | WSW 20 - 30 |
| Monday Night | WSW 40 - 50 |
| Tuesday Morning | WNW 30 - 40 |
| Tuesday Afternoon | WNW 30 - 40 |
| Tuesday Night | WNW 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.
Free Winds at 9000' (mph)
| Mt. Baker | Washington Pass | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Morning | SW 50 - 60 | SW 50 - 60 | WSW 50 - 60 | --- - | W 50 - 60 |
| Monday Afternoon | W 20 - 30 | WNW 35 - 45 | W 30 - 40 | --- - | W 35 - 45 |
| Monday Night - Tuesday Morning | WSW 50 - 60 | WSW 45 - 55 | WSW 55 - 65 | --- - | W 60 - 80 |
| Tuesday Afternoon | NW 40 - 50 | NW 50 - 60 | NW 50 - 60 | --- - | NW 50 - 60 |
| Tuesday Night | NW 25 - 35 | NW 35 - 45 | NW 35 - 45 | --- - | NW 30 - 40 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Morning | SW 50 - 60 |
| Monday Afternoon | W 20 - 30 |
| Monday Night - Tuesday Morning | WSW 50 - 60 |
| Tuesday Afternoon | NW 40 - 50 |
| Tuesday Night | NW 25 - 35 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Morning | SW 50 - 60 |
| Monday Afternoon | WNW 35 - 45 |
| Monday Night - Tuesday Morning | WSW 45 - 55 |
| Tuesday Afternoon | NW 50 - 60 |
| Tuesday Night | NW 35 - 45 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Morning | WSW 50 - 60 |
| Monday Afternoon | W 30 - 40 |
| Monday Night - Tuesday Morning | WSW 55 - 65 |
| Tuesday Afternoon | NW 50 - 60 |
| Tuesday Night | NW 35 - 45 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night - Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Morning | W 50 - 60 |
| Monday Afternoon | W 35 - 45 |
| Monday Night - Tuesday Morning | W 60 - 80 |
| Tuesday Afternoon | NW 50 - 60 |
| Tuesday Night | NW 30 - 40 |
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 16, 2016
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