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 Tuesday
It's a rare early December completely dry 5-day forecast, so enjoy the sunshine while a high pressure dominates our weather pattern and fends off the storm track.
By Tuesday evening, with the ridge axis overhead, mild air has arrived aloft for many areas west of the Cascade Crest, while the east slopes of the Cascades remain in a deep cold air pool. At 5000 ft, evening temperatures should be around 20 F degrees cooler east of the Cascade Crest, and by Wednesday morning, that contrast increases to about 30 F. That colder, denser air E of the Cascade Crest forces its way through the mountain gaps, creating moderate to strong flow through the gaps, which should peak Tuesday night into Wednesday morning. Expect cold wind-chills for Snoqualmie, Stevens, White, and Washington passes and anywhere exposed to the E flow. A single freezing level doesn't describe this scenario easily. By mid-day Wednesday, the inversion should be a bit shallower with the warmer air to the west reaching most areas above 4000 ft. With a secondary freezing level above 10000 ft, expect spring-like weather for upper elevations where temperatures will range from the mid-30's to near 50 degrees! Given the stongly contrasting temperatures, you'll want to layer your clothing accordingly.
The weather pattern doesn't change much as the high pressure ridge axis shifts to our east Wednesday night and Thursday morning. However, late in the day on Thursday, a shortwave disturbance fizzles as it approaches our coastline, bringing some high clouds to the region and likely mid-level or lower clouds to the Olympic Mountains.
Weather Forecast
Hurricane Ridge
| Tuesday Night | Clear. Inversion conditions. Mild above 4000 ft with cool temperatures below. Increasing light to occasionally moderate winds. |
| Wednesday | Sunny. Unseasonably warm. Light to moderate winds. |
Mt. Baker
| Tuesday Night | Clear. Inversion conditions: Mild above 4000 ft with cool temperatures below. Increasing light to occasionally moderate winds. |
| Wednesday | Sunny. Unseasonably warm. Light to moderate winds. |
Washington Pass and Leavenworth
| Tuesday Night | Clear. Inversion conditions. Cold below 5500 ft, mild above. Increasing light to moderate winds. |
| Wednesday | Sunny. Inversion becoming increasingly shallow. Mild above, cool below. Light to moderate winds. |
Stevens and Snoqualmie Pass
| Tuesday Night | Clear. Inversion conditions. Cold below 5000 ft, warm above. Increasing winds becoming moderate at 5000 ft and moderate to strong E flow at pass level. |
| Wednesday | Sunny. Increasingly shallow inversion dropping to 3000-4000 ft by afternoon. Very mild above, cool below. |
Mt. Rainier, Crystal and White Pass
| Tuesday Night | Clear. Inversion conditions. Cold below 5000 ft, warm above. Increasing winds becoming light to moderate. |
| Wednesday | Sunny. Increasingly shallow inversion dropping to 3000-4000 ft by afternoon. Very mild above, cool below. |
Mt. Hood
| Tuesday Night | Clear. Inversion conditions. Cold below 5500 ft, warm above. Increasing winds becoming moderate to strong. |
| Wednesday | Increasingly shallow inversion dropping to 3000-4000 ft by afternoon. Very mild above, cool below. |
Issued: 2:06 PM PST Tuesday, December 1, 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 | Freezing Level * | 10500' | 2500' | 1000' | 10000' | 1000' | 2000' | 3000' | 3500' |
| Tuesday Night | Freezing Level * | 12000' | 4500' | 1000' | 1000' | 1000' | 2000' | 3500' | 3500' |
| Wednesday Morning | Freezing Level * | 12000' | 10000' | 1000' | 1000' | 1000' | 2500' | 10500' | 11000' |
| Wednesday Afternoon | Freezing Level * | 12000' | 11500' | 4000' | 4000' | 10000' | 10500' | 10500' | 11000' |
| Wednesday Evening | Freezing Level * | 11000' | 10500' | 2000' | 1500' | 1500' | 2500' | 3500' | 2500' |
| Wednesday Night | Freezing Level * | 10000' | 9500' | 1500' | 1000' | 1000' | 2000' | 4000' | 2000' |
| Thursday Morning | Freezing Level * | 9500' | 9500' | 10000' | 10500' | 10500' | 10500' | 11000' | 11000' |
| Thursday Afternoon | Freezing Level * | 9500' | 9000' | 9500' | 10000' | 10000' | 10000' | 10500' | 11000' |
| Hurricane Ridge | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 10500' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 12000' (Easterly Flow *) |
| Wednesday Morning |
Freezing Level 12000' (Easterly Flow *) |
| Wednesday Afternoon |
Freezing Level 12000' (Easterly Flow *) |
| Wednesday Evening |
Freezing Level 11000' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 10000' (Easterly Flow *) |
| Thursday Morning |
Freezing Level 9500' (Easterly Flow *) |
| Thursday Afternoon |
Freezing Level 9500' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 2500' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 4500' (Easterly Flow *) |
| Wednesday Morning |
Freezing Level 10000' (Easterly Flow *) |
| Wednesday Afternoon |
Freezing Level 11500' (Easterly Flow *) |
| Wednesday Evening |
Freezing Level 10500' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 9500' (Easterly Flow *) |
| Thursday Morning |
Freezing Level 9500' (Easterly Flow *) |
| Thursday Afternoon |
Freezing Level 9000' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 1000' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 1000' (Easterly Flow *) |
| Wednesday Morning |
Freezing Level 1000' (Easterly Flow *) |
| Wednesday Afternoon |
Freezing Level 4000' (Easterly Flow *) |
| Wednesday Evening |
Freezing Level 2000' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 1500' (Easterly Flow *) |
| Thursday Morning |
Freezing Level 10000' (Easterly Flow *) |
| Thursday Afternoon |
Freezing Level 9500' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 10000' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 1000' (Easterly Flow *) |
| Wednesday Morning |
Freezing Level 1000' (Easterly Flow *) |
| Wednesday Afternoon |
Freezing Level 4000' (Easterly Flow *) |
| Wednesday Evening |
Freezing Level 1500' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 1000' (Easterly Flow *) |
| Thursday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Thursday Afternoon |
Freezing Level 10000' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 1000' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 1000' (Easterly Flow *) |
| Wednesday Morning |
Freezing Level 1000' (Easterly Flow *) |
| Wednesday Afternoon |
Freezing Level 10000' (Easterly Flow *) |
| Wednesday Evening |
Freezing Level 1500' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 1000' (Easterly Flow *) |
| Thursday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Thursday Afternoon |
Freezing Level 10000' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 2000' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 2000' (Easterly Flow *) |
| Wednesday Morning |
Freezing Level 2500' (Easterly Flow *) |
| Wednesday Afternoon |
Freezing Level 10500' (Easterly Flow *) |
| Wednesday Evening |
Freezing Level 2500' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 2000' (Easterly Flow *) |
| Thursday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Thursday Afternoon |
Freezing Level 10000' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 3000' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 3500' (Easterly Flow *) |
| Wednesday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Wednesday Afternoon |
Freezing Level 10500' (Easterly Flow *) |
| Wednesday Evening |
Freezing Level 3500' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 4000' (Easterly Flow *) |
| Thursday Morning |
Freezing Level 11000' (Easterly Flow *) |
| Thursday Afternoon |
Freezing Level 10500' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Evening |
Freezing Level 3500' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 3500' (Easterly Flow *) |
| Wednesday Morning |
Freezing Level 11000' (Easterly Flow *) |
| Wednesday Afternoon |
Freezing Level 11000' (Easterly Flow *) |
| Wednesday Evening |
Freezing Level 2500' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 2000' (Easterly Flow *) |
| Thursday Morning |
Freezing Level 11000' (Easterly Flow *) |
| Thursday Afternoon |
Freezing Level 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.
Precipitation Forecast
| Tuesday Night | Tuesday | Tuesday Night | Tuesday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | 0 | 0 | 0 | 0 |
| Mt Baker Ski Area | 0 | 0 | 0 | 0 |
| Washington Pass | 0 | 0 | 0 | 0 |
| Leavenworth | 0 | 0 | 0 | 0 |
| Stevens Pass | 0 | 0 | 0 | 0 |
| Snoqualmie Pass | 0 | 0 | 0 | 0 |
| Mission Ridge | 0 | 0 | 0 | 0 |
| Crystal Mt | 0 | 0 | 0 | 0 |
| Paradise | 0 | 0 | 0 | 0 |
| White Pass | 0 | 0 | 0 | 0 |
| Mt Hood Meadows | 0 | 0 | 0 | 0 |
| Timberline | 0 | 0 | 0 | 0 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Tuesday | 0 |
| Tuesday Night | 0 |
| Tuesday | 0 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Tuesday | 0 |
| Tuesday Night | 0 |
| Tuesday | 0 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Tuesday | 0 |
| Tuesday Night | 0 |
| Tuesday | 0 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Tuesday | 0 |
| Tuesday Night | 0 |
| Tuesday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Tuesday | 0 |
| Tuesday Night | 0 |
| Tuesday | 0 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Tuesday | 0 |
| Tuesday Night | 0 |
| Tuesday | 0 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Tuesday | 0 |
| Tuesday Night | 0 |
| Tuesday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Tuesday | 0 |
| Tuesday Night | 0 |
| Tuesday | 0 |
| Paradise | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Tuesday | 0 |
| Tuesday Night | 0 |
| Tuesday | 0 |
| White Pass | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Tuesday | 0 |
| Tuesday Night | 0 |
| Tuesday | 0 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Tuesday | 0 |
| Tuesday Night | 0 |
| Tuesday | 0 |
| Timberline | Precipitation Forecast |
|---|---|
| Tuesday Night | 0 |
| Tuesday | 0 |
| Tuesday Night | 0 |
| Tuesday | 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: 2:06 PM PST Tuesday, December 1, 2020
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Tuesday Evening | E 5 - 15 | E 5 - 15 | ESE 10 - 20 | E 5 - 15 | E 15 - 25 |
| Tuesday Night | SE 5 - 15 | E 5 - 15 | ESE 15 - 25 | E 10 - 20 | E 25 - 35 |
| Wednesday Morning | SSE 10 - 20 | E 5 - 15 | ESE 15 - 25 | E 10 - 20 | ESE 20 - 30 |
| Wednesday Afternoon | S 10 - 20 | ESE 5 - 15 | ESE 10 - 20 | ESE 10 - 20 | ESE 15 - 25 |
| Hurricane Ridge | Elevation |
|---|---|
| Tuesday Evening | E 5 - 15 |
| Tuesday Night | SE 5 - 15 |
| Wednesday Morning | SSE 10 - 20 |
| Wednesday Afternoon | S 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Evening | E 5 - 15 |
| Tuesday Night | E 5 - 15 |
| Wednesday Morning | E 5 - 15 |
| Wednesday Afternoon | ESE 5 - 15 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Evening | ESE 10 - 20 |
| Tuesday Night | ESE 15 - 25 |
| Wednesday Morning | ESE 15 - 25 |
| Wednesday Afternoon | ESE 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Tuesday Evening | E 5 - 15 |
| Tuesday Night | E 10 - 20 |
| Wednesday Morning | E 10 - 20 |
| Wednesday Afternoon | ESE 10 - 20 |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Evening | E 15 - 25 |
| Tuesday Night | E 25 - 35 |
| Wednesday Morning | ESE 20 - 30 |
| Wednesday Afternoon | ESE 15 - 25 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Tuesday Evening | E 5 - 15 |
| Tuesday Night | SE 5 - 15 |
| Wednesday Morning | SSE 10 - 20 |
| Wednesday Afternoon | S 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Tuesday Evening | E 5 - 15 |
| Tuesday Night | E 5 - 15 |
| Wednesday Morning | E 5 - 15 |
| Wednesday Afternoon | ESE 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Tuesday Evening | ESE 10 - 20 |
| Tuesday Night | ESE 15 - 25 |
| Wednesday Morning | ESE 15 - 25 |
| Wednesday Afternoon | ESE 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Tuesday Evening | E 5 - 15 |
| Tuesday Night | E 10 - 20 |
| Wednesday Morning | E 10 - 20 |
| Wednesday Afternoon | ESE 10 - 20 |
| Mt. Hood | Direction - Speed |
|---|---|
| Tuesday Evening | E 15 - 25 |
| Tuesday Night | E 25 - 35 |
| Wednesday Morning | ESE 20 - 30 |
| Wednesday Afternoon | ESE 15 - 25 |
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 | E 5 - 15 | E 5 - 15 | E 10 - 20 | ESE 10 - 20 | E 10 - 20 |
| Tuesday Night | SSE 10 - 20 | SE 5 - 15 | SE 15 - 25 | SE 15 - 25 | SE 15 - 25 |
| Wednesday Morning | S 20 - 30 | S 15 - 25 | S 25 - 35 | S 25 - 35 | SSE 20 - 30 |
| Wednesday Afternoon | S 25 - 35 | S 20 - 30 | S 25 - 35 | S 20 - 30 | S 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Tuesday Evening | E 5 - 15 |
| Tuesday Night | SSE 10 - 20 |
| Wednesday Morning | S 20 - 30 |
| Wednesday Afternoon | S 25 - 35 |
| Washington Pass | Direction - Speed |
|---|---|
| Tuesday Evening | E 5 - 15 |
| Tuesday Night | SE 5 - 15 |
| Wednesday Morning | S 15 - 25 |
| Wednesday Afternoon | S 20 - 30 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Tuesday Evening | E 10 - 20 |
| Tuesday Night | SE 15 - 25 |
| Wednesday Morning | S 25 - 35 |
| Wednesday Afternoon | S 25 - 35 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Tuesday Evening | ESE 10 - 20 |
| Tuesday Night | SE 15 - 25 |
| Wednesday Morning | S 25 - 35 |
| Wednesday Afternoon | S 20 - 30 |
| Mt. Hood | Direction - Speed |
|---|---|
| Tuesday Evening | E 10 - 20 |
| Tuesday Night | SE 15 - 25 |
| Wednesday Morning | SSE 20 - 30 |
| Wednesday Afternoon | S 15 - 25 |
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: 2:06 PM PST Tuesday, December 1, 2020
Extended Weather Synopsis for Tuesday night through Tuesday
The high pressure ridge strengthens rapidly again behind Thursday's fizzled shortwave, leading to full sunshine and more inversion conditions Friday through Saturday, along with renewed E flow. A stronger system approaches the coast Saturday night, but recent model runs have it falling apart by the time it makes landfall on Sunday. Expect a chance of some light rain and high elevation snow.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Thursday Night | Freezing Level | 9500' - 10500' | 10000' - 11000' | 10500' - 11500' | * |
| Friday | Freezing Level | 8000' - 9000' | 9500' - 10500' | 11000' - 12000' | * |
| Friday Night | Freezing Level | 10000' - 11000' | 10500' - 11500' | 11000' - 12000' | * |
| Saturday | Freezing Level | 9500' - 10500' | 10000' - 11000' | 11000' - 12000' | * |
| Mt. Baker | Elevation |
|---|---|
| Thursday Night |
Freezing Level 9500' - 10500' (Easterly Flow *) |
| Friday |
Freezing Level 8000' - 9000' (Easterly Flow *) |
| Friday Night |
Freezing Level 10000' - 11000' (Easterly Flow *) |
| Saturday |
Freezing Level 9500' - 10500' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Thursday Night |
Freezing Level 10000' - 11000' (Easterly Flow *) |
| Friday |
Freezing Level 9500' - 10500' (Easterly Flow *) |
| Friday Night |
Freezing Level 10500' - 11500' (Easterly Flow *) |
| Saturday |
Freezing Level 10000' - 11000' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Thursday Night |
Freezing Level 10500' - 11500' (Easterly Flow *) |
| Friday |
Freezing Level 11000' - 12000' (Easterly Flow *) |
| Friday Night |
Freezing Level 11000' - 12000' (Easterly Flow *) |
| Saturday |
Freezing Level 11000' - 12000' (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 Dec 1, 2020
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