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 night through Thursday
A persistent high-amplitude ridge continues to shield the Pacific Northwest from storm activity this week. An approaching shortwave trough falls apart as it approaches the coastline on Thursday, running into the ridge and dry low-level offshore flow. However, the weak disturbance is bringing a deck of mid-level clouds a slight chance of a passing shower and a switch to SW and then W flow aloft by Thursday evening. The ridge pops back up later Thursday night, clearing skies and warming temperatures across the region.
Our once potent cold pool should mostly dissipate Thursday night as easterly gradients turn briefly westerly during the overnight hours, turning flow westerly at all levels through the mountain gaps by morning.
Friday should be unseasonably warm once again (particularly west of the Cascade Crest) and sunny with mostly light winds and patchy cold air pooling in the morning, particularly east of the Cascade Crest.
Light E flow should re-develop due to the increasing temperature contrast, which will increase Friday night with high pressure continuing to dominate. The cold pool east of the Cascade Crest will begin to re-form and expect moderate E flow through the mountain gaps. The E flow should peak on Saturday morning before southerly winds begin to increase and mix the atmosphere ahead of a low arriving late Saturday night.
Weather Forecast
Hurricane Ridge
| Thursday Night | Partly cloudy in the evening, then clearing skies after midnight. Mild, with above-freezing temperatures. Light winds. |
| Friday |
Mt. Baker
| Thursday Night | Mostly cloudy in the evening, then clearing skies after midnight. Mild, with temperatures mostly above freezing. Light winds. |
| Friday |
Washington Pass and Leavenworth
| Thursday Night | Mostly cloudy in the evening, then clearing skies after midnight. Mild, with temperatures mostly above freezing except in deep valleys. Light winds. |
| Friday |
Stevens and Snoqualmie Pass
| Thursday Night | Mostly cloudy in the evening, then clearing skies after midnight. Mild, with temperatures mostly above freezing except near pass level. Light winds at 5000 ft and light E wind switching W through the passes. |
| Friday |
Mt. Rainier, Crystal and White Pass
| Thursday Night | Mostly cloudy in the evening, then clearing skies after midnight. Mild, with temperatures mostly above freezing except. Light winds. |
| Friday |
Mt. Hood
| Thursday Night | Mostly cloudy in the evening, then clearing skies after midnight. Mild, with temperatures mostly above freezing except in deep valleys. Light winds. |
| Friday |
Issued: 2:15 PM PST Thursday, December 3, 2020
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Thursday Evening | Freezing Level * | 9000' | 8000' | 8500' | 8500' | 8000' | 8000' | 8500' | 9000' |
| Thursday Night | Freezing Level | 10000' | 9000' | 9000' | 9000' | 9000' | 9000' | 9000' | 9000' |
| Friday Morning | Freezing Level * | 10000' | 9000' | 10500' | 10500' | 10500' | 10500' | 10500' | 10500' |
| Friday Afternoon | Freezing Level * | 10500' | 11000' | 10500' | 11000' | 11000' | 11000' | 11000' | 10500' |
| Friday Evening | Freezing Level * | 11000' | 11000' | 11000' | 11000' | 11000' | 11000' | 11000' | 11500' |
| Friday Night | Freezing Level * | 11500' | 11000' | 11500' | 11500' | 11500' | 11500' | 11500' | 12000' |
| Saturday Morning | Freezing Level * | 11500' | 11500' | 11500' | 1500' | 2500' | 2500' | 11500' | 12000' |
| Saturday Afternoon | Freezing Level * | 10500' | 11000' | 11500' | 11500' | 11500' | 11000' | 11000' | 11000' |
| Hurricane Ridge | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 9000' (Easterly Flow *) |
| Thursday Night |
Freezing Level 10000' |
| Friday Morning |
Freezing Level 10000' (Easterly Flow *) |
| Friday Afternoon |
Freezing Level 10500' (Easterly Flow *) |
| Friday Evening |
Freezing Level 11000' (Easterly Flow *) |
| Friday Night |
Freezing Level 11500' (Easterly Flow *) |
| Saturday Morning |
Freezing Level 11500' (Easterly Flow *) |
| Saturday Afternoon |
Freezing Level 10500' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 8000' (Easterly Flow *) |
| Thursday Night |
Freezing Level 9000' |
| Friday Morning |
Freezing Level 9000' (Easterly Flow *) |
| Friday Afternoon |
Freezing Level 11000' (Easterly Flow *) |
| Friday Evening |
Freezing Level 11000' (Easterly Flow *) |
| Friday Night |
Freezing Level 11000' (Easterly Flow *) |
| Saturday Morning |
Freezing Level 11500' (Easterly Flow *) |
| Saturday Afternoon |
Freezing Level 11000' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 8500' (Easterly Flow *) |
| Thursday Night |
Freezing Level 9000' |
| Friday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Friday Afternoon |
Freezing Level 10500' (Easterly Flow *) |
| Friday Evening |
Freezing Level 11000' (Easterly Flow *) |
| Friday Night |
Freezing Level 11500' (Easterly Flow *) |
| Saturday Morning |
Freezing Level 11500' (Easterly Flow *) |
| Saturday Afternoon |
Freezing Level 11500' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 8500' (Easterly Flow *) |
| Thursday Night |
Freezing Level 9000' |
| Friday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Friday Afternoon |
Freezing Level 11000' (Easterly Flow *) |
| Friday Evening |
Freezing Level 11000' (Easterly Flow *) |
| Friday Night |
Freezing Level 11500' (Easterly Flow *) |
| Saturday Morning |
Freezing Level 1500' (Easterly Flow *) |
| Saturday Afternoon |
Freezing Level 11500' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 8000' (Easterly Flow *) |
| Thursday Night |
Freezing Level 9000' |
| Friday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Friday Afternoon |
Freezing Level 11000' (Easterly Flow *) |
| Friday Evening |
Freezing Level 11000' (Easterly Flow *) |
| Friday Night |
Freezing Level 11500' (Easterly Flow *) |
| Saturday Morning |
Freezing Level 2500' (Easterly Flow *) |
| Saturday Afternoon |
Freezing Level 11500' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 8000' (Easterly Flow *) |
| Thursday Night |
Freezing Level 9000' |
| Friday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Friday Afternoon |
Freezing Level 11000' (Easterly Flow *) |
| Friday Evening |
Freezing Level 11000' (Easterly Flow *) |
| Friday Night |
Freezing Level 11500' (Easterly Flow *) |
| Saturday Morning |
Freezing Level 2500' (Easterly Flow *) |
| Saturday Afternoon |
Freezing Level 11000' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 8500' (Easterly Flow *) |
| Thursday Night |
Freezing Level 9000' |
| Friday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Friday Afternoon |
Freezing Level 11000' (Easterly Flow *) |
| Friday Evening |
Freezing Level 11000' (Easterly Flow *) |
| Friday Night |
Freezing Level 11500' (Easterly Flow *) |
| Saturday Morning |
Freezing Level 11500' (Easterly Flow *) |
| Saturday Afternoon |
Freezing Level 11000' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 9000' (Easterly Flow *) |
| Thursday Night |
Freezing Level 9000' |
| Friday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Friday Afternoon |
Freezing Level 10500' (Easterly Flow *) |
| Friday Evening |
Freezing Level 11500' (Easterly Flow *) |
| Friday Night |
Freezing Level 12000' (Easterly Flow *) |
| Saturday Morning |
Freezing Level 12000' (Easterly Flow *) |
| Saturday 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
| Thursday Night | Thursday | Thursday Night | Thursday | |
|---|---|---|---|---|
| 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 |
|---|---|
| Thursday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Paradise | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| White Pass | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Timberline | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 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: 2:15 PM PST Thursday, December 3, 2020
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Thursday Evening | SW 5 - 15 | SSW 5 - 15 | W 0 - 10 | W 0 - 10 | WNW 0 - 10 |
| Thursday Night | SW 0 - 10 | WSW 0 - 10 | W 0 - 10 | W 0 - 10 | W 0 - 10 |
| Friday Morning | SW 0 - 10 | WNW 0 - 10 | ESE 5 - 15 | ESE 5 - 15 | ESE 5 - 15 |
| Friday Afternoon | SSE 5 - 15 | W 0 - 10 | ESE 10 - 20 | ESE 5 - 15 | ESE 10 - 20 |
| Hurricane Ridge | Elevation |
|---|---|
| Thursday Evening | SW 5 - 15 |
| Thursday Night | SW 0 - 10 |
| Friday Morning | SW 0 - 10 |
| Friday Afternoon | SSE 5 - 15 |
| Mt. Baker | Elevation |
|---|---|
| Thursday Evening | SSW 5 - 15 |
| Thursday Night | WSW 0 - 10 |
| Friday Morning | WNW 0 - 10 |
| Friday Afternoon | W 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Thursday Evening | W 0 - 10 |
| Thursday Night | W 0 - 10 |
| Friday Morning | ESE 5 - 15 |
| Friday Afternoon | ESE 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Thursday Evening | W 0 - 10 |
| Thursday Night | W 0 - 10 |
| Friday Morning | ESE 5 - 15 |
| Friday Afternoon | ESE 5 - 15 |
| Mt. Hood | Elevation |
|---|---|
| Thursday Evening | WNW 0 - 10 |
| Thursday Night | W 0 - 10 |
| Friday Morning | ESE 5 - 15 |
| Friday Afternoon | ESE 10 - 20 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Thursday Evening | SW 5 - 15 |
| Thursday Night | SW 0 - 10 |
| Friday Morning | SW 0 - 10 |
| Friday Afternoon | SSE 5 - 15 |
| Mt. Baker | Direction - Speed |
|---|---|
| Thursday Evening | SSW 5 - 15 |
| Thursday Night | WSW 0 - 10 |
| Friday Morning | WNW 0 - 10 |
| Friday Afternoon | W 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Thursday Evening | W 0 - 10 |
| Thursday Night | W 0 - 10 |
| Friday Morning | ESE 5 - 15 |
| Friday Afternoon | ESE 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Thursday Evening | W 0 - 10 |
| Thursday Night | W 0 - 10 |
| Friday Morning | ESE 5 - 15 |
| Friday Afternoon | ESE 5 - 15 |
| Mt. Hood | Direction - Speed |
|---|---|
| Thursday Evening | WNW 0 - 10 |
| Thursday Night | W 0 - 10 |
| Friday Morning | ESE 5 - 15 |
| Friday Afternoon | ESE 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 | |
|---|---|---|---|---|---|
| Thursday Evening | W 15 - 25 | W 10 - 20 | WNW 15 - 25 | NW 10 - 20 | WNW 10 - 20 |
| Thursday Night | WNW 15 - 25 | WNW 15 - 25 | NW 10 - 20 | NNW 10 - 20 | NNW 10 - 20 |
| Friday Morning | WNW 15 - 25 | WNW 10 - 20 | NW 10 - 20 | NW 10 - 20 | N 5 - 15 |
| Friday Afternoon | W 10 - 20 | WSW 0 - 10 | WNW 0 - 10 | ESE 0 - 10 | ENE 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Thursday Evening | W 15 - 25 |
| Thursday Night | WNW 15 - 25 |
| Friday Morning | WNW 15 - 25 |
| Friday Afternoon | W 10 - 20 |
| Washington Pass | Direction - Speed |
|---|---|
| Thursday Evening | W 10 - 20 |
| Thursday Night | WNW 15 - 25 |
| Friday Morning | WNW 10 - 20 |
| Friday Afternoon | WSW 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Thursday Evening | WNW 15 - 25 |
| Thursday Night | NW 10 - 20 |
| Friday Morning | NW 10 - 20 |
| Friday Afternoon | WNW 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Thursday Evening | NW 10 - 20 |
| Thursday Night | NNW 10 - 20 |
| Friday Morning | NW 10 - 20 |
| Friday Afternoon | ESE 0 - 10 |
| Mt. Hood | Direction - Speed |
|---|---|
| Thursday Evening | WNW 10 - 20 |
| Thursday Night | NNW 10 - 20 |
| Friday Morning | N 5 - 15 |
| Friday Afternoon | ENE 0 - 10 |
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: 2:15 PM PST Thursday, December 3, 2020
Extended Weather Synopsis for Thursday night through Thursday
The next system is likely to weaken and split off from the jet stream, forming a cutoff circulation as it tracks toward Oregon. It is likely to bring some rain and high elevation snow showers to Mt. Hood and the southern Cascades. Other areas are likely to experience decreasing E flow Saturday night into Sunday, along with some clouds, but mild temperatures continue west of the Cascade Crest.
Sunday night and Monday will feature the main jetstream gradually working south and flattening the ridge over the region. A slowly approaching system may bring increasing clouds and some wind to northern Washington as it drops down from the NW on Monday. Temperatures should remain mild, but slightly cooler.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Saturday Night | Snow Level | 6500' - 8500' | 6000' - 8000' | 6000' - 7500' | |
| Sunday | Snow Level | 5000' - 6000' | 5000' - 6000' | 5000' - 6000' | |
| Sunday Night | Freezing Level | 6000' - 8000' | 8000' - 9500' | 9000' - 11000' | |
| Monday | Freezing Level | 7500' - 9500' | 10000' - 11000' | 11000' - 12000' |
| Mt. Baker | Elevation |
|---|---|
| Saturday Night |
Snow Level 6500' - 8500' |
| Sunday |
Snow Level 5000' - 6000' |
| Sunday Night |
Freezing Level 6000' - 8000' |
| Monday |
Freezing Level 7500' - 9500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Saturday Night |
Snow Level 6000' - 8000' |
| Sunday |
Snow Level 5000' - 6000' |
| Sunday Night |
Freezing Level 8000' - 9500' |
| Monday |
Freezing Level 10000' - 11000' |
| Mt. Hood | Elevation |
|---|---|
| Saturday Night |
Snow Level 6000' - 7500' |
| Sunday |
Snow Level 5000' - 6000' |
| Sunday Night |
Freezing Level 9000' - 11000' |
| Monday |
Freezing Level 11000' - 12000' |
* 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 3, 2020
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