Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Tuesday & Friday
After a quiet Tuesday with only a few stray showers around, a weak Pacific frontal system will push through the Cascades during the early morning hours with light rain and snow developing overnight. The trailing longwave upper level trough will move over the region on Wednesday keeping clouds and showers in the forecast. The flow will turn more westerly and heavier precipitation should become more oriented between Stevens and Snoqualmie Passes by mid-day with the possibility of a Puget Sound Convergence Zone locally enhancing accumulations. Despite the upper trough overhead, snow levels won't be especially low and Snoqualmie Pass will likely have to contend with a rain/snow mix again.
Shower activity should taper down Wednesday night as an upper level ridge begins to build offshore.
Weather Forecast
Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Tuesday Afternoon |
Increasing high clouds, otherwise mostly cloudy with isolated showers. |
| Tuesday Night |
Cloudy with light rain and snow developing overnight. |
| Wednesday |
Light to occasionally moderate rain and snow showers becoming more focused on the central Cascades in the afternoon in and around Stevens and Snoqualmie Passes. |
| Wednesday Night |
Mostly cloudy with light rain and snow showers tapering down overnight. |
Olympics
| Tuesday Afternoon |
Increasing high clouds, otherwise mostly cloudy with isolated showers. |
| Tuesday Night |
Cloudy with light rain and snow developing overnight. |
| Wednesday |
Mostly cloudy with light to occasionally moderate rain and snow showers. |
| Wednesday Night |
Mostly cloudy with light rain and snow showers tapering down overnight. |
East slopes of the Washington Cascades
| Tuesday Afternoon |
Increasing high clouds, otherwise partly sunny. |
| Tuesday Night |
Cloudy with light rain and snow developing overnight. |
| Wednesday |
Mostly cloudy with light rain and snow showers mainly near the Cascade crest. |
| Wednesday Night |
Partly cloudy with isolated light rain and snow showers tapering off overnight. |
Mt. Hood Area
| Tuesday Afternoon |
Increasing high clouds, otherwise partly sunny. |
| Tuesday Night |
Cloudy with light to occasionally moderate rain and snow developing late tonight. |
| Wednesday |
Light to moderate rain and snow showers. |
| Wednesday Night |
Mostly cloudy with light rain and snow showers tapering down overnight. |
Issued: 2:06 PM PST Tuesday, November 29, 2016
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Tuesday Afternoon | Snow Level | 3000' | 4000' | 3000' | ' | ' | 4000' | ' | 4500' |
| Tuesday Night | Snow Level | 4000' | 3000' | 2500' | ' | ' | 3500' | ' | 4500' |
| Wednesday | Snow Level | 3500' | 3000' | 3000' | ' | ' | 3500' | ' | 3500' |
| Wednesday Night | Snow Level | 2500' | 2500' | 1500' | ' | ' | 2500' | ' | 3000' |
| Hurricane Ridge | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level 3000' |
| Tuesday Night |
Snow Level 4000' |
| Wednesday |
Snow Level 3500' |
| Wednesday Night |
Snow Level 2500' |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level 4000' |
| Tuesday Night |
Snow Level 3000' |
| Wednesday |
Snow Level 3000' |
| Wednesday Night |
Snow Level 2500' |
| Washington Pass | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level 3000' |
| Tuesday Night |
Snow Level 2500' |
| Wednesday |
Snow Level 3000' |
| Wednesday Night |
Snow Level 1500' |
| Leavenworth | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Wednesday |
Snow Level ' |
| Wednesday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Wednesday |
Snow Level ' |
| Wednesday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level 4000' |
| Tuesday Night |
Snow Level 3500' |
| Wednesday |
Snow Level 3500' |
| Wednesday Night |
Snow Level 2500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Wednesday |
Snow Level ' |
| Wednesday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level 4500' |
| Tuesday Night |
Snow Level 4500' |
| Wednesday |
Snow Level 3500' |
| Wednesday Night |
Snow Level 3000' |
* 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 0.25 | 0.25 - 0.50 |
| Mt Baker Ski Area | LT 0.10 | 0.50 - 0.75 |
| Washington Pass | LT 0.10 | LT 0.25 |
| Stevens Pass | LT 0.10 | 0.75 - 1.00 |
| Snoqualmie Pass | LT 0.10 | 0.75 - 1.00 |
| Mission Ridge | LT 0.10 | LT 0.10 |
| Crystal Mt | LT 0.10 | 0.25 - 0.50 |
| Paradise | LT 0.25 | 0 - 1.00 |
| White Pass | LT 0.10 | 0.25 - 0.50 |
| Mt Hood Meadows | LT 0.25 | 0 - 1.00 |
| Timberline | 0.25 - 0.50 | 1.00 - 1.50 |
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: 2:06 PM PST Tuesday, November 29, 2016
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Tuesday Afternoon | S 0 - 10 | S 0 - 10 | S 0 - 10 | --- - | S 0 - 10 |
| Tuesday Night | SSW 15 - 25 | SE 10 - 20 | SE 10 - 20 | --- - | SSW 5 - 15 |
| Wednesday Morning | W 15 - 25 | SW 10 - 20 | W 10 - 20 | --- - | W 10 - 20 |
| Wednesday Afternoon | NW 15 - 25 | WNW 5 - 15 | W 15 - 30 | --- - | WNW 15 - 25 |
| Wednesday Night | NW 10 - 20 | W 0 - 10 | WNW 5 - 15 | --- - | WNW 15 - 25 |
| Hurricane Ridge | Elevation |
|---|---|
| Tuesday Afternoon | S 0 - 10 |
| Tuesday Night | SSW 15 - 25 |
| Wednesday Morning | W 15 - 25 |
| Wednesday Afternoon | NW 15 - 25 |
| Wednesday Night | NW 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Afternoon | S 0 - 10 |
| Tuesday Night | SE 10 - 20 |
| Wednesday Morning | SW 10 - 20 |
| Wednesday Afternoon | WNW 5 - 15 |
| Wednesday Night | W 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Afternoon | S 0 - 10 |
| Tuesday Night | SE 10 - 20 |
| Wednesday Morning | W 10 - 20 |
| Wednesday Afternoon | W 15 - 30 |
| Wednesday Night | WNW 5 - 15 |
| Mt. Rainier | Elevation |
|---|---|
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Afternoon | S 0 - 10 |
| Tuesday Night | SSW 5 - 15 |
| Wednesday Morning | W 10 - 20 |
| Wednesday Afternoon | WNW 15 - 25 |
| Wednesday Night | WNW 15 - 25 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Tuesday Afternoon | S 0 - 10 |
| Tuesday Night | SSW 15 - 25 |
| Wednesday Morning | W 15 - 25 |
| Wednesday Afternoon | NW 15 - 25 |
| Wednesday Night | NW 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Tuesday Afternoon | S 0 - 10 |
| Tuesday Night | SE 10 - 20 |
| Wednesday Morning | SW 10 - 20 |
| Wednesday Afternoon | WNW 5 - 15 |
| Wednesday Night | W 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Tuesday Afternoon | S 0 - 10 |
| Tuesday Night | SE 10 - 20 |
| Wednesday Morning | W 10 - 20 |
| Wednesday Afternoon | W 15 - 30 |
| Wednesday Night | WNW 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Tuesday Afternoon | S 0 - 10 |
| Tuesday Night | SSW 5 - 15 |
| Wednesday Morning | W 10 - 20 |
| Wednesday Afternoon | WNW 15 - 25 |
| Wednesday Night | WNW 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 | |
|---|---|---|---|---|---|
| Tuesday Afternoon | W 5 - 15 | W 0 - 10 | W 10 - 20 | --- - | WNW 10 - 20 |
| Tuesday Night - Wednesday Morning | SW 15 - 30 | SW 10 - 20 | SW 15 - 30 | --- - | SW 20 - 35 |
| Wednesday Afternoon | W 10 - 20 | W 15 - 25 | W 20 - 35 | --- - | WNW 20 - 35 |
| Wednesday Night | WNW 0 - 10 | NW 5 - 15 | NW 10 - 20 | --- - | NW 25 - 35 |
| Mt. Baker | Direction - Speed |
|---|---|
| Tuesday Afternoon | W 5 - 15 |
| Tuesday Night - Wednesday Morning | SW 15 - 30 |
| Wednesday Afternoon | W 10 - 20 |
| Wednesday Night | WNW 0 - 10 |
| Washington Pass | Direction - Speed |
|---|---|
| Tuesday Afternoon | W 0 - 10 |
| Tuesday Night - Wednesday Morning | SW 10 - 20 |
| Wednesday Afternoon | W 15 - 25 |
| Wednesday Night | NW 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Tuesday Afternoon | W 10 - 20 |
| Tuesday Night - Wednesday Morning | SW 15 - 30 |
| Wednesday Afternoon | W 20 - 35 |
| Wednesday Night | NW 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Tuesday Afternoon | --- - |
| Tuesday Night - Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Tuesday Afternoon | WNW 10 - 20 |
| Tuesday Night - Wednesday Morning | SW 20 - 35 |
| Wednesday Afternoon | WNW 20 - 35 |
| Wednesday Night | NW 25 - 35 |
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: 2:06 PM PST Tuesday, November 29, 2016
Extended Weather Synopsis for Friday night through Friday
Thursday should be a break before a stormy weekend. A weak disturbance riding up over the top of the ridge may bring some light showers west of the crest as well as increasing cloudiness. The east slopes should be dry and at least partly sunny.
On Friday, the upper level ridge will begin to flop over the PNW as a frontal system sags south from British Columbia and spreads precipitation over the northern half of Washington by Friday afternoon. Light to moderate precipitation looks likely from Snoqualmie Pass to the Canadian Border with much lighter precipitation further south through Saturday morning. Forecast models are advertising a decent warming trend during this period with snow levels peaking Friday night.
Another wave of moisture rides over what's left of the ridge Saturday in moderate WNW flow and delivers a second decent shot of precipitation for the Olympics and North Cascades and not much for the south Cascades of Washington and Mt. Hood. Snow levels should start to lower Saturday during the day as the jet stream that was previously aimed into central B.C. sags south. Expect the specifics on snow levels and water amounts to flop around so far out.
Extended Weather
Olympics, Washington Cascades and Mt. Hood
Partly to mostly cloudy with the slight chance of a shower Olympics, west slopes of the Cascades and Mt. Hood. Partly to mostly sunny east slopes of the Cascades.
Partly cloudy.
Increasing clouds with light rain and snow developing Olympics and North Cascades by the early afternoon and beginning to spread south. Mostly cloudy Mt. Hood. Slow warming trend. Moderate WNW winds at crest level.
Periods of moderate rain and snow Olympics and north Cascades, light to moderate rain and snow central Cascades and light rain and snow south Cascades. Moderate WNW winds at crest level. Milder.
Periods of moderate rain and snow Olympics and north Cascades, light to moderate rain and snow central Cascades and light rain and snow south Cascades. Moderate WNW winds at crest level. Cooling trend.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Thursday - Friday Morning | Snow Level | 2000' - 3000' | 2000' - 3000' | 3000' - 4000' | |
| Friday Afternoon - Saturday Morning | Snow Level | 4000' - 5000' | 4500' - 5500' | 5500' - 6500' | |
| Saturday Mid-day - Saturday Afternoon | Snow Level | 2500' - 3500' | 3000' - 4000' | 3500' - 4500' |
| Mt. Baker | Elevation |
|---|---|
| Thursday - Friday Morning |
Snow Level 2000' - 3000' |
| Friday Afternoon - Saturday Morning |
Snow Level 4000' - 5000' |
| Saturday Mid-day - Saturday Afternoon |
Snow Level 2500' - 3500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Thursday - Friday Morning |
Snow Level 2000' - 3000' |
| Friday Afternoon - Saturday Morning |
Snow Level 4500' - 5500' |
| Saturday Mid-day - Saturday Afternoon |
Snow Level 3000' - 4000' |
| Mt. Hood | Elevation |
|---|---|
| Thursday - Friday Morning |
Snow Level 3000' - 4000' |
| Friday Afternoon - Saturday Morning |
Snow Level 5500' - 6500' |
| Saturday Mid-day - Saturday Afternoon |
Snow Level 3500' - 4500' |
* 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 28, 2016
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