Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Friday night through Tuesday
Welcome back! We are starting the 2020-21 forecast season a bit early and in style with plenty of snow to talk about. We hope everyone has a great winter season - we're just getting started.
An intense low-pressure system passed through Vancouver, BC on Friday, walloping the Pacific Northwest with its first widespread dump of snow. Water amounts were generally 1-2 inches with this storm along the west slopes of the Cascades and Mt. Hood and 0.50" or less on the east slopes. Corresponding snowfall totals were 1-2+ ft and 6" or less respectively.
Light to occasionally moderate showers will continue as the low passes into the interior of B.C. Friday night through mid-day Saturday with further light snow accumulations mainly for the west slopes of the Cascades and Mt. Hood. Look for slightly higher totals (6+ inches) where a Puget Sound Convergence zone sets up between Stevens Pass and Hwy 20 W. Expect moderate to locally strong westerly ridgeline winds to continue overnight.
A strong winter-like jet will slam the triple point of a frontal system into northern Oregon and the south Washington Cascades on Saturday night where the heaviest snow (1-2 ft) is expected. Lesser amounts will be seen further north as a weakening occluded front passes through Saturday night. Moderate westerly post-frontal flow should more evenly spread precipitation around on Sunday in the form of persistent showers, with significant new snow accumulations along the west slopes of the Cascades and Mt. Hood above 3000-4000 ft and lesser amounts in the Crystal area (blocking likely) and along the east side of the Cascades. Keep an eye out as snow levels begin to creep up Saturday night through Sunday morning into the 3000-4000 ft range for the central and south Washington Cascades and ~5500' at Mt Hood.
Weather Forecast
Hurricane Ridge
Friday Night | Mostly cloudy with light snow showers. Strong ridgeline winds. |
Saturday | Mostly cloudy with a chance of snow showers in the morning. Light snow developing in the afternoon, becoming moderate late. |
Mt. Baker
Friday Night | Cloudy with light snow showers. Strong ridgeline winds. |
Saturday | Mostly cloudy with a chance of snow showers in the morning. Light snow developing in the afternoon. |
Washington Pass and Leavenworth
Friday Night | Mostly cloudy with light snow showers.Strong ridgeline winds. |
Saturday | Cloudy with light snow showers becoming scattered showers in the afternoon. |
Stevens and Snoqualmie Pass
Friday Night | Light snow showers, moderate near Puget Sound Convergence Zone. Moderate west winds at Pass level. Strong ridgeline winds. |
Saturday | Mostly cloudy with light to locally moderate snow showers in the morning easing mid-day. Light snow developing in the afternoon. Light west winds becoming east at Pass level. |
Mt. Rainier, Crystal and White Pass
Friday Night | Light to occasionally moderate snow showers. Strong ridgeline winds. |
Saturday | Light snow showers in the morning, becoming light to moderate snow in the afternoon. |
Mt. Hood
Friday Night | Light to moderate snow showers. Very windy. |
Saturday | Light snow showers in the morning, becoming light to moderate snow late in the afternoon. Very windy upper mountain. |
Issued: 1:14 PM PST Friday, November 13, 2020
Snow/Freezing Level (ft)
Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
---|---|---|---|---|---|---|---|---|---|
Friday Evening | Snow Level | 2000' | 2000' | 2000' | 2000' | 2000' | 2000' | 2500' | 3000' |
Friday Night | Snow Level | 2000' | 2000' | 1500' | 1500' | 2000' | 2000' | 2500' | 2500' |
Saturday Morning | Snow Level | 2000' | 2000' | 1500' | 1500' | 2000' | 2000' | 2500' | 3000' |
Saturday Afternoon | Snow Level * | 2500' | 2000' | 2000' | 2500' | 2500' | 2500' | 2500' | 3500' |
Saturday Evening | Snow Level * | 2500' | 2000' | 2000' | 2000' | 2500' | 2500' | 3000' | 3500' |
Saturday Night | Snow Level * | 4500' | 2500' | 2000' | 2500' | 2500' | 3500' | 4000' | 5500' |
Sunday Morning | Snow Level | 3500' | 3000' | 3000' | 2500' | 4000' | 4000' | 4500' | 5000' |
Sunday Afternoon | Snow Level | 3500' | 3000' | 3000' | 3500' | 3000' | 3000' | 3500' | 4500' |
Hurricane Ridge | Elevation |
---|---|
Friday Evening |
Snow Level 2000' |
Friday Night |
Snow Level 2000' |
Saturday Morning |
Snow Level 2000' |
Saturday Afternoon |
Snow Level 2500' (Easterly Flow *) |
Saturday Evening |
Snow Level 2500' (Easterly Flow *) |
Saturday Night |
Snow Level 4500' (Easterly Flow *) |
Sunday Morning |
Snow Level 3500' |
Sunday Afternoon |
Snow Level 3500' |
Mt. Baker | Elevation |
---|---|
Friday Evening |
Snow Level 2000' |
Friday Night |
Snow Level 2000' |
Saturday Morning |
Snow Level 2000' |
Saturday Afternoon |
Snow Level 2000' (Easterly Flow *) |
Saturday Evening |
Snow Level 2000' (Easterly Flow *) |
Saturday Night |
Snow Level 2500' (Easterly Flow *) |
Sunday Morning |
Snow Level 3000' |
Sunday Afternoon |
Snow Level 3000' |
Washington Pass | Elevation |
---|---|
Friday Evening |
Snow Level 2000' |
Friday Night |
Snow Level 1500' |
Saturday Morning |
Snow Level 1500' |
Saturday Afternoon |
Snow Level 2000' (Easterly Flow *) |
Saturday Evening |
Snow Level 2000' (Easterly Flow *) |
Saturday Night |
Snow Level 2000' (Easterly Flow *) |
Sunday Morning |
Snow Level 3000' |
Sunday Afternoon |
Snow Level 3000' |
Leavenworth | Elevation |
---|---|
Friday Evening |
Snow Level 2000' |
Friday Night |
Snow Level 1500' |
Saturday Morning |
Snow Level 1500' |
Saturday Afternoon |
Snow Level 2500' (Easterly Flow *) |
Saturday Evening |
Snow Level 2000' (Easterly Flow *) |
Saturday Night |
Snow Level 2500' (Easterly Flow *) |
Sunday Morning |
Snow Level 2500' |
Sunday Afternoon |
Snow Level 3500' |
Stevens Pass | Elevation |
---|---|
Friday Evening |
Snow Level 2000' |
Friday Night |
Snow Level 2000' |
Saturday Morning |
Snow Level 2000' |
Saturday Afternoon |
Snow Level 2500' (Easterly Flow *) |
Saturday Evening |
Snow Level 2500' (Easterly Flow *) |
Saturday Night |
Snow Level 2500' (Easterly Flow *) |
Sunday Morning |
Snow Level 4000' |
Sunday Afternoon |
Snow Level 3000' |
Snoqualmie Pass | Elevation |
---|---|
Friday Evening |
Snow Level 2000' |
Friday Night |
Snow Level 2000' |
Saturday Morning |
Snow Level 2000' |
Saturday Afternoon |
Snow Level 2500' (Easterly Flow *) |
Saturday Evening |
Snow Level 2500' (Easterly Flow *) |
Saturday Night |
Snow Level 3500' (Easterly Flow *) |
Sunday Morning |
Snow Level 4000' |
Sunday Afternoon |
Snow Level 3000' |
Mt. Rainier & Crystal | Elevation |
---|---|
Friday Evening |
Snow Level 2500' |
Friday Night |
Snow Level 2500' |
Saturday Morning |
Snow Level 2500' |
Saturday Afternoon |
Snow Level 2500' (Easterly Flow *) |
Saturday Evening |
Snow Level 3000' (Easterly Flow *) |
Saturday Night |
Snow Level 4000' (Easterly Flow *) |
Sunday Morning |
Snow Level 4500' |
Sunday Afternoon |
Snow Level 3500' |
Mt. Hood | Elevation |
---|---|
Friday Evening |
Snow Level 3000' |
Friday Night |
Snow Level 2500' |
Saturday Morning |
Snow Level 3000' |
Saturday Afternoon |
Snow Level 3500' (Easterly Flow *) |
Saturday Evening |
Snow Level 3500' (Easterly Flow *) |
Saturday Night |
Snow Level 5500' (Easterly Flow *) |
Sunday Morning |
Snow Level 5000' |
Sunday Afternoon |
Snow Level 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.
Precipitation Forecast
Friday Night | Tuesday | Tuesday Night | Tuesday | |
---|---|---|---|---|
4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
Hurricane Ridge | LT 0.10 | LT 0.25 | 0.25 - 0.50 | LT 0.25 |
Mt Baker Ski Area | 0.25 - 0.50 | LT 0.25 | 0.50 | 0.75 -1.00 |
Washington Pass | LT 0.25 | LT 0.10 | 0.25 - 0.50 | LT 0.25 |
Leavenworth | LT 0.10 | LT 0.10 | 0.25 - 0.50 | LT 0.10 |
Stevens Pass | 0.25 - 0.50 | LT 0.25 | 0.50 | 0.75 |
Snoqualmie Pass | 0.25 | LT 0.25 | 0.50 - 0.75 | 0.75 -1.00 |
Mission Ridge | LT 0.10 | LT 0.10 | 0.25 - 0.50 | LT 0.10 |
Crystal Mt | LT 0.25 | LT 0.25 | 0.50 - 0.75 | LT 0.25 |
Paradise | 0.25 - 0.50 | 0.50 | 0.75 -1.00 | 0.75 |
White Pass | 0.25 - 0.50 | LT 0.25 | 0.75 | 0.25 - 0.50 |
Mt Hood Meadows | 0.50 - 0.75 | 0.50 - 0.75 | 1.50 | LT 0.25 |
Timberline | 0.75 | 0.75 | 1.50 - 2.00 | 0.25 |
Hurricane Ridge | Precipitation Forecast |
---|---|
Friday Night | LT 0.10 |
Tuesday | LT 0.25 |
Tuesday Night | 0.25 - 0.50 |
Tuesday | LT 0.25 |
Mt Baker Ski Area | Precipitation Forecast |
---|---|
Friday Night | 0.25 - 0.50 |
Tuesday | LT 0.25 |
Tuesday Night | 0.50 |
Tuesday | 0.75 -1.00 |
Washington Pass | Precipitation Forecast |
---|---|
Friday Night | LT 0.25 |
Tuesday | LT 0.10 |
Tuesday Night | 0.25 - 0.50 |
Tuesday | LT 0.25 |
Leavenworth | Precipitation Forecast |
---|---|
Friday Night | LT 0.10 |
Tuesday | LT 0.10 |
Tuesday Night | 0.25 - 0.50 |
Tuesday | LT 0.10 |
Stevens Pass | Precipitation Forecast |
---|---|
Friday Night | 0.25 - 0.50 |
Tuesday | LT 0.25 |
Tuesday Night | 0.50 |
Tuesday | 0.75 |
Snoqualmie Pass | Precipitation Forecast |
---|---|
Friday Night | 0.25 |
Tuesday | LT 0.25 |
Tuesday Night | 0.50 - 0.75 |
Tuesday | 0.75 -1.00 |
Mission Ridge | Precipitation Forecast |
---|---|
Friday Night | LT 0.10 |
Tuesday | LT 0.10 |
Tuesday Night | 0.25 - 0.50 |
Tuesday | LT 0.10 |
Crystal Mt | Precipitation Forecast |
---|---|
Friday Night | LT 0.25 |
Tuesday | LT 0.25 |
Tuesday Night | 0.50 - 0.75 |
Tuesday | LT 0.25 |
Paradise | Precipitation Forecast |
---|---|
Friday Night | 0.25 - 0.50 |
Tuesday | 0.50 |
Tuesday Night | 0.75 -1.00 |
Tuesday | 0.75 |
White Pass | Precipitation Forecast |
---|---|
Friday Night | 0.25 - 0.50 |
Tuesday | LT 0.25 |
Tuesday Night | 0.75 |
Tuesday | 0.25 - 0.50 |
Mt Hood Meadows | Precipitation Forecast |
---|---|
Friday Night | 0.50 - 0.75 |
Tuesday | 0.50 - 0.75 |
Tuesday Night | 1.50 |
Tuesday | LT 0.25 |
Timberline | Precipitation Forecast |
---|---|
Friday Night | 0.75 |
Tuesday | 0.75 |
Tuesday Night | 1.50 - 2.00 |
Tuesday | 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: 1:14 PM PST Friday, November 13, 2020
Free Winds at 5000' (mph)
Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
---|---|---|---|---|---|
Friday Evening | W 25 - 35 | SW 25 - 35 | WSW 25 - 35 | W 20 - 30 | W 35 - 45 |
Friday Night | W 20 - 30 | SW 15 - 25 | W 20 - 30 | W 20 - 30 | W 30 - 40 |
Saturday Morning | W 10 - 20 | SW 5 - 15 | W 10 - 20 | W 10 - 20 | W 25 - 35 |
Saturday Afternoon | SE 5 - 15 | SE 5 - 15 | SE 5 - 15 | SE 5 - 15 | S 10 - 20 |
Hurricane Ridge | Elevation |
---|---|
Friday Evening | W 25 - 35 |
Friday Night | W 20 - 30 |
Saturday Morning | W 10 - 20 |
Saturday Afternoon | SE 5 - 15 |
Mt. Baker | Elevation |
---|---|
Friday Evening | SW 25 - 35 |
Friday Night | SW 15 - 25 |
Saturday Morning | SW 5 - 15 |
Saturday Afternoon | SE 5 - 15 |
Stevens and Snoqualmie Pass | Elevation |
---|---|
Friday Evening | WSW 25 - 35 |
Friday Night | W 20 - 30 |
Saturday Morning | W 10 - 20 |
Saturday Afternoon | SE 5 - 15 |
Mt. Rainier | Elevation |
---|---|
Friday Evening | W 20 - 30 |
Friday Night | W 20 - 30 |
Saturday Morning | W 10 - 20 |
Saturday Afternoon | SE 5 - 15 |
Mt. Hood | Elevation |
---|---|
Friday Evening | W 35 - 45 |
Friday Night | W 30 - 40 |
Saturday Morning | W 25 - 35 |
Saturday Afternoon | S 10 - 20 |
Hurricane Ridge | Direction - Speed |
---|---|
Friday Evening | W 25 - 35 |
Friday Night | W 20 - 30 |
Saturday Morning | W 10 - 20 |
Saturday Afternoon | SE 5 - 15 |
Mt. Baker | Direction - Speed |
---|---|
Friday Evening | SW 25 - 35 |
Friday Night | SW 15 - 25 |
Saturday Morning | SW 5 - 15 |
Saturday Afternoon | SE 5 - 15 |
Stevens and Snoqualmie Pass | Direction - Speed |
---|---|
Friday Evening | WSW 25 - 35 |
Friday Night | W 20 - 30 |
Saturday Morning | W 10 - 20 |
Saturday Afternoon | SE 5 - 15 |
Mt. Rainier | Direction - Speed |
---|---|
Friday Evening | W 20 - 30 |
Friday Night | W 20 - 30 |
Saturday Morning | W 10 - 20 |
Saturday Afternoon | SE 5 - 15 |
Mt. Hood | Direction - Speed |
---|---|
Friday Evening | W 35 - 45 |
Friday Night | W 30 - 40 |
Saturday Morning | W 25 - 35 |
Saturday Afternoon | S 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 | |
---|---|---|---|---|---|
Friday Evening | W 40 - 50 | W 50 - 60 | W 45 - 55 | W 40 - 50 | W 50 - 60 |
Friday Night | W 30 - 40 | W 50 - 60 | W 40 - 50 | SW 40 - 50 | SW 45 - 55 |
Saturday Morning | W 20 - 30 | W 30 - 40 | W 30 - 40 | W 35 - 45 | W 35 - 45 |
Saturday Afternoon | SW 20 - 30 | SW 5 - 15 | SW 20 - 30 | SW 30 - 40 | SW 40 - 60 |
Mt. Baker | Direction - Speed |
---|---|
Friday Evening | W 40 - 50 |
Friday Night | W 30 - 40 |
Saturday Morning | W 20 - 30 |
Saturday Afternoon | SW 20 - 30 |
Washington Pass | Direction - Speed |
---|---|
Friday Evening | W 50 - 60 |
Friday Night | W 50 - 60 |
Saturday Morning | W 30 - 40 |
Saturday Afternoon | SW 5 - 15 |
Stevens and Snoqualmie Pass | Direction - Speed |
---|---|
Friday Evening | W 45 - 55 |
Friday Night | W 40 - 50 |
Saturday Morning | W 30 - 40 |
Saturday Afternoon | SW 20 - 30 |
Mt. Rainier | Direction - Speed |
---|---|
Friday Evening | W 40 - 50 |
Friday Night | SW 40 - 50 |
Saturday Morning | W 35 - 45 |
Saturday Afternoon | SW 30 - 40 |
Mt. Hood | Direction - Speed |
---|---|
Friday Evening | W 50 - 60 |
Friday Night | SW 45 - 55 |
Saturday Morning | W 35 - 45 |
Saturday Afternoon | SW 40 - 60 |
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: 1:14 PM PST Friday, November 13, 2020
Extended Weather Synopsis for Tuesday night through Tuesday
Look for shower activity to wind down Sunday night. A developing low-pressure system well off the coast of Oregon will begin to lift warm frontal precipitation across northern Oregon Monday morning and Washington state during the day. This warm front will likely bring a quick blast of snow, followed by rapidly rising snow levels following the frontal passage.
Precipitation will largely shut-off Monday night as we sit in the warm sector, waiting for the low's trailing cold front to pass through some time on Tuesday. Strong offshore flow will develop as the low deepens Monday night, expect moderate to strong easterly winds to develop in the Cascades Passes and potentially extend up to crest-level along the west slopes of the Cascades. The further north the center of the low tracks Monday night, the longer we'll sit in warm air on Tuesday and the weaker the frontal passage will be both in terms of precipitation and cooling when it finally passes through.
Extended Snow/Freezing Levels
Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
---|---|---|---|---|---|
Sunday Night | Snow Level | 2000' - 3000' | 2500' - 3500' | 4000' - 5000' | |
Monday | Snow Level | 3000' - 4000' | 3000' - 4000' | 6500' - 7500' | * |
Monday Night | Snow Level | 5000' - 6000' | 5500' - 6500' | 8500' - 9500' | * |
Tuesday | Snow Level | 5000' - 6000' | 5000' - 6000' | 6000' - 7000' |
Mt. Baker | Elevation |
---|---|
Sunday Night |
Snow Level 2000' - 3000' |
Monday |
Snow Level 3000' - 4000' (Easterly Flow *) |
Monday Night |
Snow Level 5000' - 6000' (Easterly Flow *) |
Tuesday |
Snow Level 5000' - 6000' |
Snoqualmie Pass | Elevation |
---|---|
Sunday Night |
Snow Level 2500' - 3500' |
Monday |
Snow Level 3000' - 4000' (Easterly Flow *) |
Monday Night |
Snow Level 5500' - 6500' (Easterly Flow *) |
Tuesday |
Snow Level 5000' - 6000' |
Mt. Hood | Elevation |
---|---|
Sunday Night |
Snow Level 4000' - 5000' |
Monday |
Snow Level 6500' - 7500' (Easterly Flow *) |
Monday Night |
Snow Level 8500' - 9500' (Easterly Flow *) |
Tuesday |
Snow Level 6000' - 7000' |
* 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 Apr 12, 2020
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