Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Thursday & Friday
Strong southwesterly flow and a very warm, moisture-laiden airmass of tropical origin has been with us for the past several days causing heavy rain. On Thursday, a front and weakening trough are crossing the Pacific Northwest, causing continued strong southwest flow and further moderate to heavy precipitation with snow levels starting to lower.
On Friday, a weak broad ridge builds over the western U.S. as the next front approaches over the Northwest coastal waters bringing initial moisture brushing the Olympics and northwest Cascades zones.
Weather Forecast
Olympics
| Thursday Morning |
Moderate to heavy rain and snow. |
| Thursday Afternoon |
Light to moderate rain and snow showers. |
| Thursday Night |
Light to moderate rain and snow showers. |
| Friday Morning |
Light rain and snow. |
| Friday Afternoon |
Light to moderate rain and snow. |
| Friday Night |
Moderate rain and snow. |
Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Thursday Morning |
Moderate to heavy rain and snow. |
| Thursday Afternoon |
Moderate to heavy rain and snow changing to light to moderate rain and snow showers with heavier showers in convergence zone centered near the Mountain Loop area. |
| Thursday Night |
Light to moderate rain and snow showers, heaviest northern part. |
| Friday Morning |
Light rain and snow, heaviest north. |
| Friday Afternoon |
Light to moderate rain and snow north; light rain and snow in central and south. |
| Friday Night |
Moderate rain and snow in the north with light rain and snow showers ending central and south. |
East slopes of the Washington Cascades
| Thursday Morning |
Moderate to heavy rain and snow. |
| Thursday Afternoon |
Moderate to heavy rain and snow changing to light to moderate rain and snow showers with heavier showers in convergence zone centered near the Mountain Loop area. |
| Thursday Night |
Light rain and snow showers, heaviest northern part. |
| Friday Morning |
Light rain and snow, heaviest north. |
| Friday Afternoon |
Light rain and snow north; light rain and snow in central and south at higher elevation. |
| Friday Night |
Light rain and snow higher elevations, mainly in the north. |
Mt. Hood Area
| Thursday Morning |
Moderate to heavy rain and snow. |
| Thursday Afternoon |
Moderate to heavy rain and snow. |
| Thursday Night |
Light to moderate rain and snow showers. |
| Friday Morning |
Light rain and snow showers. |
| Friday Afternoon |
Light rain and snow showers ending. |
| Friday Night |
Decreasing clouds, becoming partly clear. |
Issued: 12:18 PM PST Thursday, November 23, 2017
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Thursday Morning | Snow Level | 5000' | 5000' | 6000' | ' | ' | 7000' | ' | 8000' |
| Thursday Afternoon | Snow Level | 4000' | 4000' | 4500' | ' | ' | 5000' | ' | 6000' |
| Thursday Night | Snow Level | 3500' | 3500' | 3500' | ' | ' | 3500' | ' | 4000' |
| Friday Morning | Snow Level | 4000' | 3500' | 3500' | ' | ' | 3500' | ' | 4000' |
| Friday Afternoon | Snow Level | 4500' | 4000' | 4000' | ' | ' | 4000' | ' | 4500' |
| Friday Night | Snow Level | 4500' | 4500' | 3500' | ' | ' | 4500' | ' | 6000' |
| Hurricane Ridge | Elevation |
|---|---|
| Thursday Morning |
Snow Level 5000' |
| Thursday Afternoon |
Snow Level 4000' |
| Thursday Night |
Snow Level 3500' |
| Friday Morning |
Snow Level 4000' |
| Friday Afternoon |
Snow Level 4500' |
| Friday Night |
Snow Level 4500' |
| Mt. Baker | Elevation |
|---|---|
| Thursday Morning |
Snow Level 5000' |
| Thursday Afternoon |
Snow Level 4000' |
| Thursday Night |
Snow Level 3500' |
| Friday Morning |
Snow Level 3500' |
| Friday Afternoon |
Snow Level 4000' |
| Friday Night |
Snow Level 4500' |
| Washington Pass | Elevation |
|---|---|
| Thursday Morning |
Snow Level 6000' |
| Thursday Afternoon |
Snow Level 4500' |
| Thursday Night |
Snow Level 3500' |
| Friday Morning |
Snow Level 3500' |
| Friday Afternoon |
Snow Level 4000' |
| Friday Night |
Snow Level 3500' |
| Leavenworth | Elevation |
|---|---|
| Thursday Morning |
Snow Level ' |
| Thursday Afternoon |
Snow Level ' |
| Thursday Night |
Snow Level ' |
| Friday Morning |
Snow Level ' |
| Friday Afternoon |
Snow Level ' |
| Friday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Thursday Morning |
Snow Level ' |
| Thursday Afternoon |
Snow Level ' |
| Thursday Night |
Snow Level ' |
| Friday Morning |
Snow Level ' |
| Friday Afternoon |
Snow Level ' |
| Friday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Thursday Morning |
Snow Level 7000' |
| Thursday Afternoon |
Snow Level 5000' |
| Thursday Night |
Snow Level 3500' |
| Friday Morning |
Snow Level 3500' |
| Friday Afternoon |
Snow Level 4000' |
| Friday Night |
Snow Level 4500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Thursday Morning |
Snow Level ' |
| Thursday Afternoon |
Snow Level ' |
| Thursday Night |
Snow Level ' |
| Friday Morning |
Snow Level ' |
| Friday Afternoon |
Snow Level ' |
| Friday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Thursday Morning |
Snow Level 8000' |
| Thursday Afternoon |
Snow Level 6000' |
| Thursday Night |
Snow Level 4000' |
| Friday Morning |
Snow Level 4000' |
| Friday Afternoon |
Snow Level 4500' |
| Friday Night |
Snow Level 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.
Precipitation Forecast
| Friday | Friday | |
|---|---|---|
| Hurricane Ridge | 0 - 1.00 | 0 - 0.50 |
| Mt Baker Ski Area | 0 - 2.00 | 0 - 1.00 |
| Washington Pass | 0 - 0.75 | LT 0.25 |
| Stevens Pass | 1.50 - 2.00 | LT 0.25 |
| Snoqualmie Pass | 1.50 - 2.00 | LT 0.25 |
| Mission Ridge | 0 - 0.50 | LT 0.10 |
| Crystal Mt | 0 - 0.75 | LT 0.10 |
| Paradise | 0 - 1.50 | LT 0.25 |
| White Pass | 1.00 - 1.50 | LT 0.10 |
| Mt Hood Meadows | 0 - 2.00 | LT 0.25 |
| Timberline | 1.00 - 1.50 | LT 0.25 |
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: 12:18 PM PST Thursday, November 23, 2017
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Thursday Morning | SW 20 - 30 | SW 15 - 25 | SW 20 - 30 | --- - | SW 45 - 65 |
| Thursday Afternoon | WSW 30 - 40 | WSW 20 - 30 | WSW 30 - 40 | --- - | WSW 35 - 50 |
| Thursday Night | WSW 20 - 30 | WSW 20 - 30 | WSW 35 - 50 | --- - | WSW 30 - 40 |
| Friday Morning | SSW 20 - 30 | SSW 15 - 25 | SW 15 - 25 | --- - | SW 15 - 25 |
| Friday Afternoon | SSW 25 - 35 | SE 20 - 30 | WSW 15 - 25 | --- - | WSW 10 - 15 |
| Friday Night | SSW 20 - 35 | SSW 15 - 25 | SSW 10 - 25 | --- - | SSW 10 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Thursday Morning | SW 20 - 30 |
| Thursday Afternoon | WSW 30 - 40 |
| Thursday Night | WSW 20 - 30 |
| Friday Morning | SSW 20 - 30 |
| Friday Afternoon | SSW 25 - 35 |
| Friday Night | SSW 20 - 35 |
| Mt. Baker | Elevation |
|---|---|
| Thursday Morning | SW 15 - 25 |
| Thursday Afternoon | WSW 20 - 30 |
| Thursday Night | WSW 20 - 30 |
| Friday Morning | SSW 15 - 25 |
| Friday Afternoon | SE 20 - 30 |
| Friday Night | SSW 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Thursday Morning | SW 20 - 30 |
| Thursday Afternoon | WSW 30 - 40 |
| Thursday Night | WSW 35 - 50 |
| Friday Morning | SW 15 - 25 |
| Friday Afternoon | WSW 15 - 25 |
| Friday Night | SSW 10 - 25 |
| Mt. Rainier | Elevation |
|---|---|
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Friday Morning | --- - |
| Friday Afternoon | --- - |
| Friday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Thursday Morning | SW 45 - 65 |
| Thursday Afternoon | WSW 35 - 50 |
| Thursday Night | WSW 30 - 40 |
| Friday Morning | SW 15 - 25 |
| Friday Afternoon | WSW 10 - 15 |
| Friday Night | SSW 10 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Thursday Morning | SW 20 - 30 |
| Thursday Afternoon | WSW 30 - 40 |
| Thursday Night | WSW 20 - 30 |
| Friday Morning | SSW 20 - 30 |
| Friday Afternoon | SSW 25 - 35 |
| Friday Night | SSW 20 - 35 |
| Mt. Baker | Direction - Speed |
|---|---|
| Thursday Morning | SW 15 - 25 |
| Thursday Afternoon | WSW 20 - 30 |
| Thursday Night | WSW 20 - 30 |
| Friday Morning | SSW 15 - 25 |
| Friday Afternoon | SE 20 - 30 |
| Friday Night | SSW 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Thursday Morning | SW 20 - 30 |
| Thursday Afternoon | WSW 30 - 40 |
| Thursday Night | WSW 35 - 50 |
| Friday Morning | SW 15 - 25 |
| Friday Afternoon | WSW 15 - 25 |
| Friday Night | SSW 10 - 25 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Friday Morning | --- - |
| Friday Afternoon | --- - |
| Friday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Thursday Morning | SW 45 - 65 |
| Thursday Afternoon | WSW 35 - 50 |
| Thursday Night | WSW 30 - 40 |
| Friday Morning | SW 15 - 25 |
| Friday Afternoon | WSW 10 - 15 |
| Friday Night | SSW 10 - 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 | |
|---|---|---|---|---|---|
| Thursday Morning | SW 40 - 60 | SW 50 - 70 | SW 55 - 75 | --- - | SW 70 - 90 |
| Thursday Afternoon | WSW 40 - 60 | WSW 45 - 65 | WSW 55 - 75 | --- - | WSW 65 - 85 |
| Thursday Night | WSW 25 - 40 | SW 30 - 50 | SW 40 - 60 | --- - | SW 40 - 60 |
| Friday Morning | WSW 25 - 35 | WSW 20 - 30 | WSW 30 - 40 | --- - | WSW 25 - 35 |
| Friday Afternoon | SW 30 - 40 | SW 30 - 40 | SW 30 - 40 | --- - | SW 25 - 35 |
| Friday Night | SW 30 - 40 | SW 30 - 40 | SW 20 - 40 | --- - | SW 30 - 40 |
| Mt. Baker | Direction - Speed |
|---|---|
| Thursday Morning | SW 40 - 60 |
| Thursday Afternoon | WSW 40 - 60 |
| Thursday Night | WSW 25 - 40 |
| Friday Morning | WSW 25 - 35 |
| Friday Afternoon | SW 30 - 40 |
| Friday Night | SW 30 - 40 |
| Washington Pass | Direction - Speed |
|---|---|
| Thursday Morning | SW 50 - 70 |
| Thursday Afternoon | WSW 45 - 65 |
| Thursday Night | SW 30 - 50 |
| Friday Morning | WSW 20 - 30 |
| Friday Afternoon | SW 30 - 40 |
| Friday Night | SW 30 - 40 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Thursday Morning | SW 55 - 75 |
| Thursday Afternoon | WSW 55 - 75 |
| Thursday Night | SW 40 - 60 |
| Friday Morning | WSW 30 - 40 |
| Friday Afternoon | SW 30 - 40 |
| Friday Night | SW 20 - 40 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Friday Morning | --- - |
| Friday Afternoon | --- - |
| Friday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Thursday Morning | SW 70 - 90 |
| Thursday Afternoon | WSW 65 - 85 |
| Thursday Night | SW 40 - 60 |
| Friday Morning | WSW 25 - 35 |
| Friday Afternoon | SW 25 - 35 |
| Friday Night | SW 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.
Issued: 12:18 PM PST Thursday, November 23, 2017
Extended Weather Synopsis for Friday night through Friday
On Saturday, a deep upper trough reforms off the coast, pulling another round of moist subtropical air and a frontal system over the northwest on Saturday night into Sunday. On Monday, the upper trough comes onshore, mainly over Oregon and a shortwave ridge builds into the Pacific Northwest.
Extended Weather
All Zones
Increasing rain and snow, mainly in the afternoon.
Periods of moderate to heavy rain and snow.
Periods of moderate to heavy rain and snow becoming showers.
Decreasing showers, heaviest South Cascades.
Lights ending at Hood. Otherwise, increasing afternoon clouds with the potential for rain and snow arriving by evening in the Olympics.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Saturday Morning | Snow Level | 5500' - 6500' | 3500' - 4500' | 7500' - 8500' | |
| Saturday Afternoon | Snow Level | 4000' - 5000' | 4500' - 5500' | 5000' - 6000' | |
| Sunday Morning | Snow Level | 1500' - 3500' | 2500' - 4500' | 3000' - 5000' | |
| Sunday Afternoon | Snow Level | 1000' - 3000' | 1000' - 3000' | 3000' - 5000' | |
| Monday Night | Snow Level | 2000' - 4000' | 2000' - 4000' | 3500' - 5500' |
| Mt. Baker | Elevation |
|---|---|
| Saturday Morning |
Snow Level 5500' - 6500' |
| Saturday Afternoon |
Snow Level 4000' - 5000' |
| Sunday Morning |
Snow Level 1500' - 3500' |
| Sunday Afternoon |
Snow Level 1000' - 3000' |
| Monday Night |
Snow Level 2000' - 4000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Saturday Morning |
Snow Level 3500' - 4500' |
| Saturday Afternoon |
Snow Level 4500' - 5500' |
| Sunday Morning |
Snow Level 2500' - 4500' |
| Sunday Afternoon |
Snow Level 1000' - 3000' |
| Monday Night |
Snow Level 2000' - 4000' |
| Mt. Hood | Elevation |
|---|---|
| Saturday Morning |
Snow Level 7500' - 8500' |
| Saturday Afternoon |
Snow Level 5000' - 6000' |
| Sunday Morning |
Snow Level 3000' - 5000' |
| Sunday Afternoon |
Snow Level 3000' - 5000' |
| Monday Night |
Snow Level 3500' - 5500' |
* 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 22, 2017
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