Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Sunday night through Saturday
After a mostly sunny day that featured a wide variance in temperatures and freezing levels depending which side of the Cascade crest you were positioned, a powerful but quick moving frontal system is poised to deliver a decent shot of snow along with significant winds late tonight and Monday.
The incoming Pacific frontal system now looks like it should sweep through the Cascades around 6 am on Monday morning. Snow levels will quickly drop with the onset of precipitation to 3000 ft or lower across the region. The front will bring a moderate shot of snow to the region with post-frontal snow showers helping to accumulate 6-12" across the west slopes of the Cascades, Mt. Hood and the Olympics and only slightly lower amounts along the east slopes of the Cascades through Monday afternoon. The highest snowfall totals will likely be from around Hwy 2 and north to Mt Baker along the west slopes of the Cascades.
This system will produce significant winds, both ahead of the front with strong to extreme southerlies developing for Hurricane Ridge and the Mt Baker area later tonight and behind the front with similar strength westerlies for most areas. Strong to locally extreme west winds during the day on Monday will buffet both west and east slopes of the Cascades.
A quickly building ridge offshore should start to shut down showers more quickly for the Mt Hood region and south Washington Cascades Monday afternoon and evening. The upper level ridge will quickly amplify over the area on Tuesday with a return to dry conditions.
Weather Forecast
Hurricane Ridge
| Sunday Night | Mostly cloudy in the evening with moderate rain and snow developing after midnight. Strong to extreme ridgeline winds developing overnight. |
| Monday | Mostly cloudy with scattered rain and snow showers. Strong ridgeline winds. |
Mt. Baker
| Sunday Night | Becoming mostly cloudy in the evening with rain and snow developing late tonight. Strong to extreme winds developing overnight. |
| Monday | Moderate to occasionally heavy snow showers in the morning decreasing in the afternoon. Strong to extreme ridgeline winds early in the morning moderating in the afternoon. |
Washington Pass and Leavenworth
| Sunday Night | Mostly clear becoming cloudy after midnight. |
| Monday | Light to moderate snow becoming moderate snow showers late morning. Showers decreasing in the afternoon. Strong to extreme ridgeline winds. |
Stevens and Snoqualmie Pass
| Sunday Night | Becoming mostly cloudy in the evening with rain and snow developing late tonight. Moderate east winds in the Passes. |
| Monday | Moderate snow becoming moderate snow showers late morning. Showers decreasing in the afternoon. Strong to extreme ridgeline winds decreasing slightly in the afternoon. |
Mt. Rainier, Crystal and White Pass
| Sunday Night | Becoming mostly cloudy in the evening with rain and snow developing late tonight. Increasing ridgeline winds overnight. |
| Monday | Moderate rain and snow becoming moderate snow showers late morning. Showers decreasing and becoming scattered in the afternoon. Strong to extreme ridgeline winds decreasing slightly in the afternoon. |
Mt. Hood
| Sunday Night | Mostly clear becoming cloudy after midnight. |
| Monday | Moderate rain and snow becoming moderate snow showers late morning. Showers decreasing and becoming scattered in the afternoon. Strong to extreme ridgeline winds decreasing slightly in the afternoon. |
Issued: 1:59 PM PST Sunday, November 29, 2020
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Sunday Evening | Freezing Level * | 6000' | 5500' | 3500' | 3500' | 4000' | 5500' | 6500' | 6500' |
| Sunday Night | Snow Level * | 4500' | 3000' | 2000' | 2500' | 2500' | 3000' | 3500' | 5500' |
| Monday Morning | Snow Level | 3000' | 2500' | 2000' | 2000' | 2500' | 2500' | 3000' | 3000' |
| Monday Afternoon | Snow Level | 2000' | 2000' | 1500' | 1500' | 2000' | 2000' | 2000' | 2500' |
| Monday Evening | Snow Level | 2000' | 2000' | 1000' | 2000' | 2000' | 2000' | 2000' | 2500' |
| Monday Night | Freezing Level | 1000' | 1000' | 0' | 1000' | 1000' | 1000' | 1000' | 1500' |
| Tuesday Morning | Freezing Level | 2000' | 1500' | 1500' | 1500' | 1500' | 1500' | 1500' | 2000' |
| Tuesday Afternoon | Freezing Level | 4500' | 3500' | 2500' | 3000' | 3000' | 3000' | 4000' | 8000' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 6000' (Easterly Flow *) |
| Sunday Night |
Snow Level 4500' (Easterly Flow *) |
| Monday Morning |
Snow Level 3000' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Snow Level 2000' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 2000' |
| Tuesday Afternoon |
Freezing Level 4500' |
| Mt. Baker | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 5500' (Easterly Flow *) |
| Sunday Night |
Snow Level 3000' (Easterly Flow *) |
| Monday Morning |
Snow Level 2500' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Snow Level 2000' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 1500' |
| Tuesday Afternoon |
Freezing Level 3500' |
| Washington Pass | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 3500' (Easterly Flow *) |
| Sunday Night |
Snow Level 2000' (Easterly Flow *) |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 1500' |
| Monday Evening |
Snow Level 1000' |
| Monday Night |
Freezing Level 0' |
| Tuesday Morning |
Freezing Level 1500' |
| Tuesday Afternoon |
Freezing Level 2500' |
| Leavenworth | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 3500' (Easterly Flow *) |
| Sunday Night |
Snow Level 2500' (Easterly Flow *) |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 1500' |
| Monday Evening |
Snow Level 2000' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 1500' |
| Tuesday Afternoon |
Freezing Level 3000' |
| Stevens Pass | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 4000' (Easterly Flow *) |
| Sunday Night |
Snow Level 2500' (Easterly Flow *) |
| Monday Morning |
Snow Level 2500' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Snow Level 2000' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 1500' |
| Tuesday Afternoon |
Freezing Level 3000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 5500' (Easterly Flow *) |
| Sunday Night |
Snow Level 3000' (Easterly Flow *) |
| Monday Morning |
Snow Level 2500' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Snow Level 2000' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 1500' |
| Tuesday Afternoon |
Freezing Level 3000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 6500' (Easterly Flow *) |
| Sunday Night |
Snow Level 3500' (Easterly Flow *) |
| Monday Morning |
Snow Level 3000' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Snow Level 2000' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 1500' |
| Tuesday Afternoon |
Freezing Level 4000' |
| Mt. Hood | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 6500' (Easterly Flow *) |
| Sunday Night |
Snow Level 5500' (Easterly Flow *) |
| Monday Morning |
Snow Level 3000' |
| Monday Afternoon |
Snow Level 2500' |
| Monday Evening |
Snow Level 2500' |
| Monday Night |
Freezing Level 1500' |
| Tuesday Morning |
Freezing Level 2000' |
| Tuesday Afternoon |
Freezing Level 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.
Precipitation Forecast
| Sunday Night | Saturday | Saturday Night | Saturday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | 0.25 - 0.50 | LT 0.25 | 0 | 0 |
| Mt Baker Ski Area | LT 0.25 | 0.75 -1.00 | 0 | 0 |
| Washington Pass | 0 | 0.25 - 0.50 | 0 | 0 |
| Leavenworth | 0 | LT 0.25 | 0 | 0 |
| Stevens Pass | LT 0.10 | 0.75 | LT 0.10 | 0 |
| Snoqualmie Pass | LT 0.10 | 0.50 - 0.75 | LT 0.10 | 0 |
| Mission Ridge | 0 | LT 0.25 | 0 | 0 |
| Crystal Mt | LT 0.10 | 0.50 | 0 | 0 |
| Paradise | LT 0.25 | 0.75 | LT 0.10 | 0 |
| White Pass | 0 | 0.50 - 0.75 | LT 0.10 | 0 |
| Mt Hood Meadows | 0 | 0.75 -1.00 | LT 0.10 | 0 |
| Timberline | 0 | 1.00 | LT 0.10 | 0 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Sunday Night | 0.25 - 0.50 |
| Saturday | LT 0.25 |
| Saturday Night | 0 |
| Saturday | 0 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Saturday | 0.75 -1.00 |
| Saturday Night | 0 |
| Saturday | 0 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Saturday | 0.25 - 0.50 |
| Saturday Night | 0 |
| Saturday | 0 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Saturday | LT 0.25 |
| Saturday Night | 0 |
| Saturday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Saturday | 0.75 |
| Saturday Night | LT 0.10 |
| Saturday | 0 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Saturday | 0.50 - 0.75 |
| Saturday Night | LT 0.10 |
| Saturday | 0 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Saturday | LT 0.25 |
| Saturday Night | 0 |
| Saturday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Saturday | 0.50 |
| Saturday Night | 0 |
| Saturday | 0 |
| Paradise | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Saturday | 0.75 |
| Saturday Night | LT 0.10 |
| Saturday | 0 |
| White Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Saturday | 0.50 - 0.75 |
| Saturday Night | LT 0.10 |
| Saturday | 0 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Saturday | 0.75 -1.00 |
| Saturday Night | LT 0.10 |
| Saturday | 0 |
| Timberline | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Saturday | 1.00 |
| Saturday Night | LT 0.10 |
| Saturday | 0 |
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: 1:59 PM PST Sunday, November 29, 2020
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Evening | S 20 - 30 | S 20 - 30 | ESE 15 - 25 | S 10 - 20 | SW 10 - 20 |
| Sunday Night | S 35 - 50 | S 35 - 50 | SE 15 - 25 | S 20 - 30 | SW 20 - 30 |
| Monday Morning | WSW 30 - 40 | WSW 25 - 35 | WSW 30 - 40 | WSW 30 - 40 | WSW 30 - 40 |
| Monday Afternoon | W 25 - 35 | W 15 - 25 | W 25 - 35 | W 20 - 30 | W 25 - 35 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Evening | S 20 - 30 |
| Sunday Night | S 35 - 50 |
| Monday Morning | WSW 30 - 40 |
| Monday Afternoon | W 25 - 35 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Evening | S 20 - 30 |
| Sunday Night | S 35 - 50 |
| Monday Morning | WSW 25 - 35 |
| Monday Afternoon | W 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Evening | ESE 15 - 25 |
| Sunday Night | SE 15 - 25 |
| Monday Morning | WSW 30 - 40 |
| Monday Afternoon | W 25 - 35 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Evening | S 10 - 20 |
| Sunday Night | S 20 - 30 |
| Monday Morning | WSW 30 - 40 |
| Monday Afternoon | W 20 - 30 |
| Mt. Hood | Elevation |
|---|---|
| Sunday Evening | SW 10 - 20 |
| Sunday Night | SW 20 - 30 |
| Monday Morning | WSW 30 - 40 |
| Monday Afternoon | W 25 - 35 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Evening | S 20 - 30 |
| Sunday Night | S 35 - 50 |
| Monday Morning | WSW 30 - 40 |
| Monday Afternoon | W 25 - 35 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Evening | S 20 - 30 |
| Sunday Night | S 35 - 50 |
| Monday Morning | WSW 25 - 35 |
| Monday Afternoon | W 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Evening | ESE 15 - 25 |
| Sunday Night | SE 15 - 25 |
| Monday Morning | WSW 30 - 40 |
| Monday Afternoon | W 25 - 35 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Evening | S 10 - 20 |
| Sunday Night | S 20 - 30 |
| Monday Morning | WSW 30 - 40 |
| Monday Afternoon | W 20 - 30 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Evening | SW 10 - 20 |
| Sunday Night | SW 20 - 30 |
| Monday Morning | WSW 30 - 40 |
| Monday Afternoon | W 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 | |
|---|---|---|---|---|---|
| Sunday Evening | SW 35 - 45 | SW 25 - 35 | SW 20 - 30 | SW 20 - 30 | SW 20 - 30 |
| Sunday Night | SSW 50 - 60 | SW 30 - 40 | SW 40 - 60 | SW 40 - 60 | SW 45 - 60 |
| Monday Morning | SW 30 - 40 | SW 35 - 45 | WSW 50 - 60 | W 50 - 60 | W 55 - 65 |
| Monday Afternoon | W 30 - 40 | W 40 - 50 | WNW 40 - 50 | WNW 40 - 50 | WNW 50 - 60 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Evening | SW 35 - 45 |
| Sunday Night | SSW 50 - 60 |
| Monday Morning | SW 30 - 40 |
| Monday Afternoon | W 30 - 40 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Evening | SW 25 - 35 |
| Sunday Night | SW 30 - 40 |
| Monday Morning | SW 35 - 45 |
| Monday Afternoon | W 40 - 50 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Evening | SW 20 - 30 |
| Sunday Night | SW 40 - 60 |
| Monday Morning | WSW 50 - 60 |
| Monday Afternoon | WNW 40 - 50 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Evening | SW 20 - 30 |
| Sunday Night | SW 40 - 60 |
| Monday Morning | W 50 - 60 |
| Monday Afternoon | WNW 40 - 50 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Evening | SW 20 - 30 |
| Sunday Night | SW 45 - 60 |
| Monday Morning | W 55 - 65 |
| Monday Afternoon | WNW 50 - 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: 1:59 PM PST Sunday, November 29, 2020
Extended Weather Synopsis for Saturday night through Saturday
In the extended, dry and mainly clear weather will take hold with the next weather system at least several days away. A high amplitude ridge will flood the area with mild temperatures and high freezing levels; 10,000-11,000 ft by Wednesday. However, cold air will stay entrenched on the east side of the Cascades. As strong surface high pressure slides into the inland NW Tuesday night, offshore flow will drive that cold air through the Cascade Passes and likely up to Crest level as well. We should be in for an extended period of east winds as well as large temperature inversions, especially in the Cascade Passes and along the lower slopes on the east-side.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Tuesday Night | Freezing Level | 8000' - 10000' | 4000' - 6000' | 8000' - 10000' | * |
| Wednesday | Freezing Level | 10000' - 11000' | 10000' - 11000' | 10000' - 11000' | * |
| Wednesday Night | Freezing Level | 10000' - 11000' | 10000' - 11000' | 10000' - 11000' | * |
| Thursday | Freezing Level | 10000' - 11000' | 10000' - 11000' | 10000' - 11000' | * |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Night |
Freezing Level 8000' - 10000' (Easterly Flow *) |
| Wednesday |
Freezing Level 10000' - 11000' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 10000' - 11000' (Easterly Flow *) |
| Thursday |
Freezing Level 10000' - 11000' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Night |
Freezing Level 4000' - 6000' (Easterly Flow *) |
| Wednesday |
Freezing Level 10000' - 11000' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 10000' - 11000' (Easterly Flow *) |
| Thursday |
Freezing Level 10000' - 11000' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Night |
Freezing Level 8000' - 10000' (Easterly Flow *) |
| Wednesday |
Freezing Level 10000' - 11000' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 10000' - 11000' (Easterly Flow *) |
| Thursday |
Freezing Level 10000' - 11000' (Easterly Flow *) |
* 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 29, 2020
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