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 night through Thursday
A very deep low will continue lifting northward off the British Columbia Coastline into the Gulf of Alaska. The associated cold front moved east of the Cascades on Tuesday afternoon, allowing progressive cooling of the atmosphere on moderate to strong SW flow ahead of the offshore upper trough. Precipitation will be heaviest during Tuesday evening, with SW-NE oriented banded shower activity weakening after midnight ahead of a moderately organized circulation center also arriving on SW flow and poised to bring more sustained rain and snow during the day on Wednesday. Wednesday's disturbance should renew moderate to occasionally heavy rain and snow from SW to NE across the region on Wednesday morning with rain and snow shower activity continuing in the afternoon. The flow pattern should favor the SW slopes of the Olympics, Mt. Baker, and Mt. Rainier Tuesday night and Wednesday. Mt. Hood should also receive significant moisture on Wednesday.
Winds should shift WSW Wednesday night with light to moderate snow shower activity focusing on the west slopes of our mountains as snow levels lower further to Snoqualmie Pass level or below as the upper trough moves into the region. The snow shower activity should become light by Thursday with the cool upper trough centered over the region.
Weather Forecast
Hurricane Ridge
Tuesday Night | Light to occasional moderate rain and snow showers. Moderate winds becoming light to moderate after midnight. |
Wednesday | Light to moderate rain and snow. Light to moderate 5000 ft winds becoming moderate in the afternoon. |
Mt. Baker
Tuesday Night | Heavy rain and snow showers becoming light to moderate after midnight. Moderate 5000 ft winds. |
Wednesday | Moderate to occasionally heavy rain and snow. Light to moderate 5000 ft winds becoming moderate in the afternoon. |
Washington Pass and Leavenworth
Tuesday Night | Moderate rain and snow showers becoming light after midnight at Washington Pass. Generally light snow showers in areas further south and east of the Cascade Crest. Decreasing strong winds in the alpine. |
Wednesday | Light to moderate rain and snow. Light to moderate 5000 ft winds. |
Stevens and Snoqualmie Pass
Tuesday Night | Moderate rain and snow showers becoming light or possibly ending after midnight. Moderate 5000 ft winds becoming light to moderate after midnight. Pass-level winds W 5-15, switching E 5-15 in the early morning hours. |
Wednesday | Light to moderate rain and snow. Snow levels resting just above Snoqualmie Pass level. Light to moderate 5000 ft winds becoming moderate in the afternoon. Pass-level winds E 10-20. |
Mt. Rainier, Crystal and White Pass
Tuesday Night | Moderate to heavy snow showers at Paradise with light rain and snow showers at Crystal and White Pass. Shower activity decreasing after midnight. Moderate 5000 ft wind becoming light to moderate after midnight. |
Wednesday | Heavy rain and snow at Paradise; light to moderate rain and snow at Crystal and White Pass. Light to moderate 5000 ft winds becoming moderate in the afternoon. |
Mt. Hood
Tuesday Night | Light rain and snow showers. Very strong, but decreasing winds in the alpine. |
Wednesday | Moderate to heavy rain and snow. Increasing moderate 5000 ft winds becoming moderate to strong in the afternoon. |
Issued: 2:02 PM PST Tuesday, November 17, 2020
Snow/Freezing Level (ft)
Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
---|---|---|---|---|---|---|---|---|---|
Tuesday Evening | Snow Level | 4000' | 4500' | 4500' | 5000' | 4500' | 5000' | 5000' | 5000' |
Tuesday Night | Snow Level | 4000' | 3500' | 4000' | 4000' | 4000' | 4000' | 4000' | 4000' |
Wednesday Morning | Snow Level * | 3500' | 3500' | 3000' | 3000' | 3000' | 3500' | 3500' | 4000' |
Wednesday Afternoon | Snow Level * | 3500' | 3000' | 3000' | 3000' | 3500' | 3500' | 3500' | 4000' |
Wednesday Evening | Snow Level | 3000' | 3000' | 3000' | 3000' | 3000' | 3000' | 3000' | 3000' |
Wednesday Night | Snow Level | 2000' | 2500' | 2500' | 2500' | 2500' | 2500' | 2500' | 3000' |
Thursday Morning | Snow Level | 2500' | 2000' | 1500' | 2000' | 2500' | 2500' | 2500' | 3000' |
Thursday Afternoon | Snow Level | 2500' | 2000' | 2000' | 3000' | 2500' | 2500' | 2500' | 3000' |
Hurricane Ridge | Elevation |
---|---|
Tuesday Evening |
Snow Level 4000' |
Tuesday Night |
Snow Level 4000' |
Wednesday Morning |
Snow Level 3500' (Easterly Flow *) |
Wednesday Afternoon |
Snow Level 3500' (Easterly Flow *) |
Wednesday Evening |
Snow Level 3000' |
Wednesday Night |
Snow Level 2000' |
Thursday Morning |
Snow Level 2500' |
Thursday Afternoon |
Snow Level 2500' |
Mt. Baker | Elevation |
---|---|
Tuesday Evening |
Snow Level 4500' |
Tuesday Night |
Snow Level 3500' |
Wednesday Morning |
Snow Level 3500' (Easterly Flow *) |
Wednesday Afternoon |
Snow Level 3000' (Easterly Flow *) |
Wednesday Evening |
Snow Level 3000' |
Wednesday Night |
Snow Level 2500' |
Thursday Morning |
Snow Level 2000' |
Thursday Afternoon |
Snow Level 2000' |
Washington Pass | Elevation |
---|---|
Tuesday Evening |
Snow Level 4500' |
Tuesday Night |
Snow Level 4000' |
Wednesday Morning |
Snow Level 3000' (Easterly Flow *) |
Wednesday Afternoon |
Snow Level 3000' (Easterly Flow *) |
Wednesday Evening |
Snow Level 3000' |
Wednesday Night |
Snow Level 2500' |
Thursday Morning |
Snow Level 1500' |
Thursday Afternoon |
Snow Level 2000' |
Leavenworth | Elevation |
---|---|
Tuesday Evening |
Snow Level 5000' |
Tuesday Night |
Snow Level 4000' |
Wednesday Morning |
Snow Level 3000' (Easterly Flow *) |
Wednesday Afternoon |
Snow Level 3000' (Easterly Flow *) |
Wednesday Evening |
Snow Level 3000' |
Wednesday Night |
Snow Level 2500' |
Thursday Morning |
Snow Level 2000' |
Thursday Afternoon |
Snow Level 3000' |
Stevens Pass | Elevation |
---|---|
Tuesday Evening |
Snow Level 4500' |
Tuesday Night |
Snow Level 4000' |
Wednesday Morning |
Snow Level 3000' (Easterly Flow *) |
Wednesday Afternoon |
Snow Level 3500' (Easterly Flow *) |
Wednesday Evening |
Snow Level 3000' |
Wednesday Night |
Snow Level 2500' |
Thursday Morning |
Snow Level 2500' |
Thursday Afternoon |
Snow Level 2500' |
Snoqualmie Pass | Elevation |
---|---|
Tuesday Evening |
Snow Level 5000' |
Tuesday Night |
Snow Level 4000' |
Wednesday Morning |
Snow Level 3500' (Easterly Flow *) |
Wednesday Afternoon |
Snow Level 3500' (Easterly Flow *) |
Wednesday Evening |
Snow Level 3000' |
Wednesday Night |
Snow Level 2500' |
Thursday Morning |
Snow Level 2500' |
Thursday Afternoon |
Snow Level 2500' |
Mt. Rainier & Crystal | Elevation |
---|---|
Tuesday Evening |
Snow Level 5000' |
Tuesday Night |
Snow Level 4000' |
Wednesday Morning |
Snow Level 3500' (Easterly Flow *) |
Wednesday Afternoon |
Snow Level 3500' (Easterly Flow *) |
Wednesday Evening |
Snow Level 3000' |
Wednesday Night |
Snow Level 2500' |
Thursday Morning |
Snow Level 2500' |
Thursday Afternoon |
Snow Level 2500' |
Mt. Hood | Elevation |
---|---|
Tuesday Evening |
Snow Level 5000' |
Tuesday Night |
Snow Level 4000' |
Wednesday Morning |
Snow Level 4000' (Easterly Flow *) |
Wednesday Afternoon |
Snow Level 4000' (Easterly Flow *) |
Wednesday Evening |
Snow Level 3000' |
Wednesday Night |
Snow Level 3000' |
Thursday Morning |
Snow Level 3000' |
Thursday Afternoon |
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
Tuesday Night | Thursday | Thursday Night | Thursday | |
---|---|---|---|---|
4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
Hurricane Ridge | 0.25 | 0.25 - 0.50 | LT 0.10 | LT 0.10 |
Mt Baker Ski Area | 1.00 | 0.75 | 0.50 - 0.75 | 0.25 |
Washington Pass | 0.25 - 0.50 | 0.25 | 0.25 | LT 0.10 |
Leavenworth | LT 0.10 | 0.25 | LT 0.10 | 0 |
Stevens Pass | 0.25 - 0.50 | 0.25 | 0.25 | LT 0.25 |
Snoqualmie Pass | 0.50 | 0.25 - 0.50 | 0.25 | 0.25 |
Mission Ridge | LT 0.10 | 0.25 | LT 0.10 | 0 |
Crystal Mt | 0.25 | 0.50 | LT 0.25 | LT 0.10 |
Paradise | 0.75 -1.00 | 1.00 - 1.50 | 0.75 | 0.50 |
White Pass | 0.25 | 0.50 | 0.25 | LT 0.25 |
Mt Hood Meadows | LT 0.25 | 1.00 | 0.75 | 0.25 - 0.50 |
Timberline | 0.25 | 1.00 | 0.75 -1.00 | 0.50 |
Hurricane Ridge | Precipitation Forecast |
---|---|
Tuesday Night | 0.25 |
Thursday | 0.25 - 0.50 |
Thursday Night | LT 0.10 |
Thursday | LT 0.10 |
Mt Baker Ski Area | Precipitation Forecast |
---|---|
Tuesday Night | 1.00 |
Thursday | 0.75 |
Thursday Night | 0.50 - 0.75 |
Thursday | 0.25 |
Washington Pass | Precipitation Forecast |
---|---|
Tuesday Night | 0.25 - 0.50 |
Thursday | 0.25 |
Thursday Night | 0.25 |
Thursday | LT 0.10 |
Leavenworth | Precipitation Forecast |
---|---|
Tuesday Night | LT 0.10 |
Thursday | 0.25 |
Thursday Night | LT 0.10 |
Thursday | 0 |
Stevens Pass | Precipitation Forecast |
---|---|
Tuesday Night | 0.25 - 0.50 |
Thursday | 0.25 |
Thursday Night | 0.25 |
Thursday | LT 0.25 |
Snoqualmie Pass | Precipitation Forecast |
---|---|
Tuesday Night | 0.50 |
Thursday | 0.25 - 0.50 |
Thursday Night | 0.25 |
Thursday | 0.25 |
Mission Ridge | Precipitation Forecast |
---|---|
Tuesday Night | LT 0.10 |
Thursday | 0.25 |
Thursday Night | LT 0.10 |
Thursday | 0 |
Crystal Mt | Precipitation Forecast |
---|---|
Tuesday Night | 0.25 |
Thursday | 0.50 |
Thursday Night | LT 0.25 |
Thursday | LT 0.10 |
Paradise | Precipitation Forecast |
---|---|
Tuesday Night | 0.75 -1.00 |
Thursday | 1.00 - 1.50 |
Thursday Night | 0.75 |
Thursday | 0.50 |
White Pass | Precipitation Forecast |
---|---|
Tuesday Night | 0.25 |
Thursday | 0.50 |
Thursday Night | 0.25 |
Thursday | LT 0.25 |
Mt Hood Meadows | Precipitation Forecast |
---|---|
Tuesday Night | LT 0.25 |
Thursday | 1.00 |
Thursday Night | 0.75 |
Thursday | 0.25 - 0.50 |
Timberline | Precipitation Forecast |
---|---|
Tuesday Night | 0.25 |
Thursday | 1.00 |
Thursday Night | 0.75 -1.00 |
Thursday | 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: 2:02 PM PST Tuesday, November 17, 2020
Free Winds at 5000' (mph)
Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
---|---|---|---|---|---|
Tuesday Evening | SW 15 - 25 | S 20 - 30 | SSW 20 - 30 | SSW 20 - 30 | SW 20 - 30 |
Tuesday Night | SSW 10 - 20 | S 15 - 25 | S 10 - 20 | SSW 10 - 20 | SSW 15 - 25 |
Wednesday Morning | S 10 - 20 | ESE 10 - 20 | SSE 10 - 20 | SSE 10 - 20 | SW 15 - 25 |
Wednesday Afternoon | SW 15 - 25 | S 20 - 30 | SW 20 - 30 | SW 20 - 30 | WSW 25 - 35 |
Hurricane Ridge | Elevation |
---|---|
Tuesday Evening | SW 15 - 25 |
Tuesday Night | SSW 10 - 20 |
Wednesday Morning | S 10 - 20 |
Wednesday Afternoon | SW 15 - 25 |
Mt. Baker | Elevation |
---|---|
Tuesday Evening | S 20 - 30 |
Tuesday Night | S 15 - 25 |
Wednesday Morning | ESE 10 - 20 |
Wednesday Afternoon | S 20 - 30 |
Stevens and Snoqualmie Pass | Elevation |
---|---|
Tuesday Evening | SSW 20 - 30 |
Tuesday Night | S 10 - 20 |
Wednesday Morning | SSE 10 - 20 |
Wednesday Afternoon | SW 20 - 30 |
Mt. Rainier | Elevation |
---|---|
Tuesday Evening | SSW 20 - 30 |
Tuesday Night | SSW 10 - 20 |
Wednesday Morning | SSE 10 - 20 |
Wednesday Afternoon | SW 20 - 30 |
Mt. Hood | Elevation |
---|---|
Tuesday Evening | SW 20 - 30 |
Tuesday Night | SSW 15 - 25 |
Wednesday Morning | SW 15 - 25 |
Wednesday Afternoon | WSW 25 - 35 |
Hurricane Ridge | Direction - Speed |
---|---|
Tuesday Evening | SW 15 - 25 |
Tuesday Night | SSW 10 - 20 |
Wednesday Morning | S 10 - 20 |
Wednesday Afternoon | SW 15 - 25 |
Mt. Baker | Direction - Speed |
---|---|
Tuesday Evening | S 20 - 30 |
Tuesday Night | S 15 - 25 |
Wednesday Morning | ESE 10 - 20 |
Wednesday Afternoon | S 20 - 30 |
Stevens and Snoqualmie Pass | Direction - Speed |
---|---|
Tuesday Evening | SSW 20 - 30 |
Tuesday Night | S 10 - 20 |
Wednesday Morning | SSE 10 - 20 |
Wednesday Afternoon | SW 20 - 30 |
Mt. Rainier | Direction - Speed |
---|---|
Tuesday Evening | SSW 20 - 30 |
Tuesday Night | SSW 10 - 20 |
Wednesday Morning | SSE 10 - 20 |
Wednesday Afternoon | SW 20 - 30 |
Mt. Hood | Direction - Speed |
---|---|
Tuesday Evening | SW 20 - 30 |
Tuesday Night | SSW 15 - 25 |
Wednesday Morning | SW 15 - 25 |
Wednesday Afternoon | 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.
Free Winds at 9000' (mph)
Mt. Baker | Washington Pass | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
---|---|---|---|---|---|
Tuesday Evening | SSW 30 - 40 | SW 35 - 50 | SW 45 - 65 | SW 40 - 60 | SW 50 - 70 |
Tuesday Night | SW 25 - 35 | WSW 30 - 40 | SW 30 - 40 | SW 30 - 40 | WSW 35 - 50 |
Wednesday Morning | S 15 - 25 | SSE 20 - 30 | SSW 20 - 30 | SSW 25 - 35 | WSW 35 - 50 |
Wednesday Afternoon | SSW 30 - 40 | SW 20 - 30 | SW 30 - 40 | SW 30 - 40 | WSW 40 - 55 |
Mt. Baker | Direction - Speed |
---|---|
Tuesday Evening | SSW 30 - 40 |
Tuesday Night | SW 25 - 35 |
Wednesday Morning | S 15 - 25 |
Wednesday Afternoon | SSW 30 - 40 |
Washington Pass | Direction - Speed |
---|---|
Tuesday Evening | SW 35 - 50 |
Tuesday Night | WSW 30 - 40 |
Wednesday Morning | SSE 20 - 30 |
Wednesday Afternoon | SW 20 - 30 |
Stevens and Snoqualmie Pass | Direction - Speed |
---|---|
Tuesday Evening | SW 45 - 65 |
Tuesday Night | SW 30 - 40 |
Wednesday Morning | SSW 20 - 30 |
Wednesday Afternoon | SW 30 - 40 |
Mt. Rainier | Direction - Speed |
---|---|
Tuesday Evening | SW 40 - 60 |
Tuesday Night | SW 30 - 40 |
Wednesday Morning | SSW 25 - 35 |
Wednesday Afternoon | SW 30 - 40 |
Mt. Hood | Direction - Speed |
---|---|
Tuesday Evening | SW 50 - 70 |
Tuesday Night | WSW 35 - 50 |
Wednesday Morning | WSW 35 - 50 |
Wednesday Afternoon | WSW 40 - 55 |
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: 2:02 PM PST Tuesday, November 17, 2020
Extended Weather Synopsis for Thursday night through Thursday
The trough moderates and slides eastward as a weak ridge builds in the nearshore waters. Rain and snow shower activity should remain generally light and focused on the west slopes of the Cascades Thursday night through Saturday morning with the chance for the Mt. Hood region to dry out and warm slightly as the offshore ridge nudges into the region. Saturday afternoon could see some drier conditions across the region with another storm moving into our nearshore waters.
Extended Snow/Freezing Levels
Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
---|---|---|---|---|---|
Thursday Night | Snow Level | 1000' - 2000' | 1500' - 2500' | 2000' - 3000' | |
Friday | Snow Level | 2000' - 3000' | 2500' - 3500' | 2500' - 4000' | |
Friday Night | Snow Level | 2000' - 3000' | 2500' - 3500' | 3000' - 4000' | |
Saturday | Snow Level | 2000' - 3000' | 2500' - 3500' | 3500' - 5000' |
Mt. Baker | Elevation |
---|---|
Thursday Night |
Snow Level 1000' - 2000' |
Friday |
Snow Level 2000' - 3000' |
Friday Night |
Snow Level 2000' - 3000' |
Saturday |
Snow Level 2000' - 3000' |
Snoqualmie Pass | Elevation |
---|---|
Thursday Night |
Snow Level 1500' - 2500' |
Friday |
Snow Level 2500' - 3500' |
Friday Night |
Snow Level 2500' - 3500' |
Saturday |
Snow Level 2500' - 3500' |
Mt. Hood | Elevation |
---|---|
Thursday Night |
Snow Level 2000' - 3000' |
Friday |
Snow Level 2500' - 4000' |
Friday Night |
Snow Level 3000' - 4000' |
Saturday |
Snow Level 3500' - 5000' |
* 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 16, 2020
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