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 & Sunday
A cold upper trough is moving across the Pacific Northwest today, bringing instability as cold air aloft moves over the region. The strongest flow is over Northern California and Nevada and within our region, the slightly stronger flow is contributing to greater precipitation production over the Central and South Cascades parts of the forecast area. On Friday, a shortwave ridge rides over us, but slightly increasing westerly flow and lingering moisture contribute to showers in windward areas.
Weather Forecast
Olympics
Thursday |
Light showers. |
Thursday Night |
Light showers. |
Friday |
Light showers. |
Friday Night |
Light showers. |
Washington Cascades West Slopes
Thursday |
Light showers north; Light to moderate showers south. |
Thursday Night |
Light to moderate showers. |
Friday |
Light showers. |
Friday Night |
Light showers. |
Washington Cascades East Slopes
Thursday |
Light showers. |
Thursday Night |
Light showers, heaviest high-elevation. |
Friday |
Light showers higher elevations. |
Friday Night |
Light showers higher elevations. |
Mt. Hood
Thursday |
Increasing moderate showers. |
Thursday Night |
Moderate to heavy showers. |
Friday |
Slightly decreasing light to moderate showers. |
Friday Night |
Light showers ending. |
Issued: 4:27 PM PST Thursday, November 16, 2017
Snow/Freezing Level (ft)
Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
---|---|---|---|---|---|---|---|---|---|
Thursday | Snow Level | 3500' | 3000' | 3000' | ' | ' | 3500' | ' | 4000' |
Thursday Night | Snow Level | 2500' | 2000' | 2000' | ' | ' | 2000' | ' | 2500' |
Friday | Snow Level | 3000' | 2500' | 2500' | ' | ' | 3000' | ' | 3500' |
Hurricane Ridge | Elevation |
---|---|
Thursday |
Snow Level 3500' |
Thursday Night |
Snow Level 2500' |
Friday |
Snow Level 3000' |
Mt. Baker | Elevation |
---|---|
Thursday |
Snow Level 3000' |
Thursday Night |
Snow Level 2000' |
Friday |
Snow Level 2500' |
Washington Pass | Elevation |
---|---|
Thursday |
Snow Level 3000' |
Thursday Night |
Snow Level 2000' |
Friday |
Snow Level 2500' |
Leavenworth | Elevation |
---|---|
Thursday |
Snow Level ' |
Thursday Night |
Snow Level ' |
Friday |
Snow Level ' |
Stevens Pass | Elevation |
---|---|
Thursday |
Snow Level ' |
Thursday Night |
Snow Level ' |
Friday |
Snow Level ' |
Snoqualmie Pass | Elevation |
---|---|
Thursday |
Snow Level 3500' |
Thursday Night |
Snow Level 2000' |
Friday |
Snow Level 3000' |
Mt. Rainier & Crystal | Elevation |
---|---|
Thursday |
Snow Level ' |
Thursday Night |
Snow Level ' |
Friday |
Snow Level ' |
Mt. Hood | Elevation |
---|---|
Thursday |
Snow Level 4000' |
Thursday Night |
Snow Level 2500' |
Friday |
Snow Level 3500' |
* 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
Sunday | Sunday | |
---|---|---|
Hurricane Ridge | LT 0.10 | LT 0.10 |
Mt Baker Ski Area | 0 - 0.75 | LT 0.25 |
Washington Pass | 0.25 - 0.50 | LT 0.25 |
Stevens Pass | 0 - 0.50 | 0.25 - 0.50 |
Snoqualmie Pass | 0.50 - 0.75 | 0 - 0.50 |
Mission Ridge | LT 0.25 | 0 - 0.50 |
Crystal Mt | LT 0.25 | LT 0.25 |
Paradise | 0 - 1.50 | 0 - 0.75 |
White Pass | 0.25 - 0.50 | LT 0.25 |
Mt Hood Meadows | 1.00 - 1.50 | 0 - 0.50 |
Timberline | 0 - 1.00 | 0 - 0.50 |
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: 4:27 PM PST Thursday, November 16, 2017
Free Winds at 5000' (mph)
Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
---|---|---|---|---|---|
Thursday - Morning | SW 10 - 15 | SW 10 - 15 | SW 15 - 25 | --- - | SW 20 - 30 |
Thursday - Afternoon | SSW 10 - 15 | SSW 10 - 15 | SSW 10 - 15 | --- - | SW 15 - 25 |
Thursday - Evening | WSW 10 - 15 | SSW 5 - 10 | SW 10 - 15 | --- - | SW 20 - 30 |
Thursday - Night | W 15 - 25 | SW 10 - 15 | WSW 20 - 30 | --- - | WSW 20 - 30 |
Friday - Morning | WSW 15 - 25 | WSW 15 - 25 | WSW 20 - 30 | --- - | WSW 25 - 40 |
Friday - Afternoon | WSW 15 - 25 | WSW 15 - 25 | WSW 20 - 35 | --- - | WSW 25 - 40 |
Friday - Evening | SW 10 - 15 | SW 10 - 15 | SW 20 - 30 | --- - | SW 20 - 30 |
Hurricane Ridge | Elevation |
---|---|
Thursday - Morning | SW 10 - 15 |
Thursday - Afternoon | SSW 10 - 15 |
Thursday - Evening | WSW 10 - 15 |
Thursday - Night | W 15 - 25 |
Friday - Morning | WSW 15 - 25 |
Friday - Afternoon | WSW 15 - 25 |
Friday - Evening | SW 10 - 15 |
Mt. Baker | Elevation |
---|---|
Thursday - Morning | SW 10 - 15 |
Thursday - Afternoon | SSW 10 - 15 |
Thursday - Evening | SSW 5 - 10 |
Thursday - Night | SW 10 - 15 |
Friday - Morning | WSW 15 - 25 |
Friday - Afternoon | WSW 15 - 25 |
Friday - Evening | SW 10 - 15 |
Stevens and Snoqualmie Pass | Elevation |
---|---|
Thursday - Morning | SW 15 - 25 |
Thursday - Afternoon | SSW 10 - 15 |
Thursday - Evening | SW 10 - 15 |
Thursday - Night | WSW 20 - 30 |
Friday - Morning | WSW 20 - 30 |
Friday - Afternoon | WSW 20 - 35 |
Friday - Evening | SW 20 - 30 |
Mt. Rainier | Elevation |
---|---|
Thursday - Morning | --- - |
Thursday - Afternoon | --- - |
Thursday - Evening | --- - |
Thursday - Night | --- - |
Friday - Morning | --- - |
Friday - Afternoon | --- - |
Friday - Evening | --- - |
Mt. Hood | Elevation |
---|---|
Thursday - Morning | SW 20 - 30 |
Thursday - Afternoon | SW 15 - 25 |
Thursday - Evening | SW 20 - 30 |
Thursday - Night | WSW 20 - 30 |
Friday - Morning | WSW 25 - 40 |
Friday - Afternoon | WSW 25 - 40 |
Friday - Evening | SW 20 - 30 |
Hurricane Ridge | Direction - Speed |
---|---|
Thursday - Morning | SW 10 - 15 |
Thursday - Afternoon | SSW 10 - 15 |
Thursday - Evening | WSW 10 - 15 |
Thursday - Night | W 15 - 25 |
Friday - Morning | WSW 15 - 25 |
Friday - Afternoon | WSW 15 - 25 |
Friday - Evening | SW 10 - 15 |
Mt. Baker | Direction - Speed |
---|---|
Thursday - Morning | SW 10 - 15 |
Thursday - Afternoon | SSW 10 - 15 |
Thursday - Evening | SSW 5 - 10 |
Thursday - Night | SW 10 - 15 |
Friday - Morning | WSW 15 - 25 |
Friday - Afternoon | WSW 15 - 25 |
Friday - Evening | SW 10 - 15 |
Stevens and Snoqualmie Pass | Direction - Speed |
---|---|
Thursday - Morning | SW 15 - 25 |
Thursday - Afternoon | SSW 10 - 15 |
Thursday - Evening | SW 10 - 15 |
Thursday - Night | WSW 20 - 30 |
Friday - Morning | WSW 20 - 30 |
Friday - Afternoon | WSW 20 - 35 |
Friday - Evening | SW 20 - 30 |
Mt. Rainier | Direction - Speed |
---|---|
Thursday - Morning | --- - |
Thursday - Afternoon | --- - |
Thursday - Evening | --- - |
Thursday - Night | --- - |
Friday - Morning | --- - |
Friday - Afternoon | --- - |
Friday - Evening | --- - |
Mt. Hood | Direction - Speed |
---|---|
Thursday - Morning | SW 20 - 30 |
Thursday - Afternoon | SW 15 - 25 |
Thursday - Evening | SW 20 - 30 |
Thursday - Night | WSW 20 - 30 |
Friday - Morning | WSW 25 - 40 |
Friday - Afternoon | WSW 25 - 40 |
Friday - Evening | SW 20 - 30 |
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 20 - 35 | SW 25 - 35 | SW 25 - 35 | --- - | SW 30 - 45 |
Thursday Afternoon | WSW 15 - 25 | SW 20 - 30 | SW 25 - 35 | --- - | SW 25 - 35 |
Thursday Evening | SW 15 - 25 | SW 20 - 30 | WSW 25 - 35 | --- - | WSW 30 - 45 |
Thursday Night | WSW 20 - 30 | WSW 25 - 35 | WSW 30 - 45 | --- - | W 35 - 50 |
Friday Morning | W 25 - 35 | WSW 30 - 45 | W 40 - 55 | --- - | WSW 40 - 55 |
Friday Afternoon | W 20 - 30 | WSW 25 - 35 | WSW 35 - 50 | --- - | WSW 40 - 55 |
Friday Night | WSW 30 - 40 | WSW 30 - 40 | W 40 - 55 | --- - | WSW 25 - 35 |
Mt. Baker | Direction - Speed |
---|---|
Thursday Morning | SW 20 - 35 |
Thursday Afternoon | WSW 15 - 25 |
Thursday Evening | SW 15 - 25 |
Thursday Night | WSW 20 - 30 |
Friday Morning | W 25 - 35 |
Friday Afternoon | W 20 - 30 |
Friday Night | WSW 30 - 40 |
Washington Pass | Direction - Speed |
---|---|
Thursday Morning | SW 25 - 35 |
Thursday Afternoon | SW 20 - 30 |
Thursday Evening | SW 20 - 30 |
Thursday Night | WSW 25 - 35 |
Friday Morning | WSW 30 - 45 |
Friday Afternoon | WSW 25 - 35 |
Friday Night | WSW 30 - 40 |
Stevens and Snoqualmie Pass | Direction - Speed |
---|---|
Thursday Morning | SW 25 - 35 |
Thursday Afternoon | SW 25 - 35 |
Thursday Evening | WSW 25 - 35 |
Thursday Night | WSW 30 - 45 |
Friday Morning | W 40 - 55 |
Friday Afternoon | WSW 35 - 50 |
Friday Night | W 40 - 55 |
Mt. Rainier | Direction - Speed |
---|---|
Thursday Morning | --- - |
Thursday Afternoon | --- - |
Thursday Evening | --- - |
Thursday Night | --- - |
Friday Morning | --- - |
Friday Afternoon | --- - |
Friday Night | --- - |
Mt. Hood | Direction - Speed |
---|---|
Thursday Morning | SW 30 - 45 |
Thursday Afternoon | SW 25 - 35 |
Thursday Evening | WSW 30 - 45 |
Thursday Night | W 35 - 50 |
Friday Morning | WSW 40 - 55 |
Friday Afternoon | WSW 40 - 55 |
Friday Night | WSW 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: 4:27 PM PST Thursday, November 16, 2017
Extended Weather Synopsis for Sunday night through Sunday
A front approaches on Saturday, but remains offshore, bringing increasing southwesterly flow out ahead of it. Sunday features strong southwest flow ahead as the front crosses the Pacific Northwest. It won't linger significantly, but will bring heavy precipitation. On Monday, the upper level trough exits to the east and an upper level ridge pushes into our region from the west.
Extended Weather
All Zones
Increasing clouds, especially Olympics and Northwest Cascades.
Increasing moderate to heavy rain and snow, first reaching Olympics and northwest Cascades zones.
Showers ending, initially Olympics and NW Cascades.
Extended Snow/Freezing Levels
Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
---|---|---|---|---|---|
Saturday Morning - Sunday Afternoon | Snow Level | 2500' - 4000' | 2500' - 4000' | 3500' - 4500' | |
Sunday Evening - Monday Morning | Snow Level | 2000' - 3000' | 2500' - 4500' | 4000' - 6000' | |
Monday Afternoon | Snow Level | 3000' - 5000' | 4000' - 6000' | 6000' - 8000' |
Mt. Baker | Elevation |
---|---|
Saturday Morning - Sunday Afternoon |
Snow Level 2500' - 4000' |
Sunday Evening - Monday Morning |
Snow Level 2000' - 3000' |
Monday Afternoon |
Snow Level 3000' - 5000' |
Snoqualmie Pass | Elevation |
---|---|
Saturday Morning - Sunday Afternoon |
Snow Level 2500' - 4000' |
Sunday Evening - Monday Morning |
Snow Level 2500' - 4500' |
Monday Afternoon |
Snow Level 4000' - 6000' |
Mt. Hood | Elevation |
---|---|
Saturday Morning - Sunday Afternoon |
Snow Level 3500' - 4500' |
Sunday Evening - Monday Morning |
Snow Level 4000' - 6000' |
Monday Afternoon |
Snow Level 6000' - 8000' |
* 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 15, 2017
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