Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Weather Synopsis for Sunday & Thursday
A weak upper low passed inland through Oregon early this morning, bringing some light snow above 5500' to Mt Hood and Mt Rainier where 1-3" of snow accumulated overnight. The trailing upper level trough will spread light showers along the west slopes of the Cascades this morning with showers decreasing in the afternoon. Areas from about Snoqualmie Pass and south should see some sun mix in this afternoon. The dregs from warm frontal moisture should keep the north Cascades overcast today even though precipitation should be very light.
Weak upper level ridging will build over the area overnight and with it the return of high freezing levels. Cool east flow in the Passes will once again create temperature inversions but mid and upper slopes for all regions except the Washington Pass area should see above freezing temperatures.
Waves of moisture that ride along a quasi-stationary frontal band on Monday will mainly take aim at the central British Columbia coast. There's still uncertainty how much precipitation will slip south of the border and clip the Olympics and Mt Baker area. Snow/freezing levels will remain elevated on Monday, with cloudy and wet conditions near the Canadian border transitioning to filtered sunshine as you travel south to Mt Hood and further away from the frontal band. Also look for alpine winds to increase during the day for the Washington Cascades.
Weather Forecast
Hurricane Ridge
| Sunday | Partly to mostly cloudy, chance of light showers through mid-day. |
Mt. Baker
| Sunday | Becoming cloudy, chance of light showers. |
Washington Pass and Leavenworth
| Sunday | Partly to mostly cloudy. |
Stevens and Snoqualmie Pass
| Sunday | Mostly cloudy with light showers this morning, becoming partly to mostly cloudy this afternoon. Light west wind in the Passes becoming variable this afternoon. |
Mt. Rainier, Crystal and White Pass
| Sunday | Mostly cloudy with scattered light showers this morning, becoming partly sunny this afternoon. |
Mt. Hood
| Sunday | Mostly cloudy with scattered light showers this morning, becoming partly sunny this afternoon. |
Issued: 7:07 AM PST Sunday, December 6, 2020
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Sunday Morning | Snow Level | 4500' | 4500' | 2000' | 2000' | 4000' | 4500' | 4500' | 4500' |
| Sunday Afternoon | Snow Level | 5000' | 5000' | 4000' | 4000' | 4500' | 5000' | 5000' | 5000' |
| Sunday Evening | Freezing Level * | 5500' | 5000' | 4000' | 4000' | 4000' | 5000' | 5000' | 6000' |
| Sunday Night | Freezing Level * | 8000' | 7000' | 4500' | 7000' | 9000' | 9000' | 9000' | 9000' |
| Monday Morning | Freezing Level * | 7500' | 6000' | 3500' | 4000' | 7000' | 8000' | 9000' | 10000' |
| Monday Afternoon | Freezing Level * | 7500' | 6000' | 4000' | 4500' | 7000' | 8000' | 9000' | 10000' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Morning |
Snow Level 4500' |
| Sunday Afternoon |
Snow Level 5000' |
| Sunday Evening |
Freezing Level 5500' (Easterly Flow *) |
| Sunday Night |
Freezing Level 8000' (Easterly Flow *) |
| Monday Morning |
Freezing Level 7500' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 7500' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Sunday Morning |
Snow Level 4500' |
| Sunday Afternoon |
Snow Level 5000' |
| Sunday Evening |
Freezing Level 5000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 7000' (Easterly Flow *) |
| Monday Morning |
Freezing Level 6000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 6000' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Sunday Morning |
Snow Level 2000' |
| Sunday Afternoon |
Snow Level 4000' |
| Sunday Evening |
Freezing Level 4000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 4500' (Easterly Flow *) |
| Monday Morning |
Freezing Level 3500' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 4000' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Sunday Morning |
Snow Level 2000' |
| Sunday Afternoon |
Snow Level 4000' |
| Sunday Evening |
Freezing Level 4000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 7000' (Easterly Flow *) |
| Monday Morning |
Freezing Level 4000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 4500' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Sunday Morning |
Snow Level 4000' |
| Sunday Afternoon |
Snow Level 4500' |
| Sunday Evening |
Freezing Level 4000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 9000' (Easterly Flow *) |
| Monday Morning |
Freezing Level 7000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 7000' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Morning |
Snow Level 4500' |
| Sunday Afternoon |
Snow Level 5000' |
| Sunday Evening |
Freezing Level 5000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 9000' (Easterly Flow *) |
| Monday Morning |
Freezing Level 8000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 8000' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Morning |
Snow Level 4500' |
| Sunday Afternoon |
Snow Level 5000' |
| Sunday Evening |
Freezing Level 5000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 9000' (Easterly Flow *) |
| Monday Morning |
Freezing Level 9000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 9000' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Sunday Morning |
Snow Level 4500' |
| Sunday Afternoon |
Snow Level 5000' |
| Sunday Evening |
Freezing Level 6000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 9000' (Easterly Flow *) |
| Monday Morning |
Freezing Level 10000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 10000' (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
| Sunday | Sunday Night | Thursday | |
|---|---|---|---|
| 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | LT 0.10 | 0 | LT 0.25 |
| Mt Baker Ski Area | LT 0.10 | LT 0.10 | LT 0.25 |
| Washington Pass | 0 | 0 | LT 0.10 |
| Leavenworth | 0 | 0 | 0 |
| Stevens Pass | LT 0.10 | 0 | 0 |
| Snoqualmie Pass | LT 0.10 | 0 | 0 |
| Mission Ridge | 0 | 0 | 0 |
| Crystal Mt | 0 | 0 | 0 |
| Paradise | LT 0.25 | 0 | 0 |
| White Pass | LT 0.10 | 0 | 0 |
| Mt Hood Meadows | LT 0.10 | 0 | 0 |
| Timberline | LT 0.25 | 0 | 0 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Sunday | LT 0.10 |
| Sunday Night | 0 |
| Thursday | LT 0.25 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Sunday | LT 0.10 |
| Sunday Night | LT 0.10 |
| Thursday | LT 0.25 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Sunday | 0 |
| Sunday Night | 0 |
| Thursday | LT 0.10 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Sunday | 0 |
| Sunday Night | 0 |
| Thursday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Sunday | LT 0.10 |
| Sunday Night | 0 |
| Thursday | 0 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Sunday | LT 0.10 |
| Sunday Night | 0 |
| Thursday | 0 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Sunday | 0 |
| Sunday Night | 0 |
| Thursday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Sunday | 0 |
| Sunday Night | 0 |
| Thursday | 0 |
| Paradise | Precipitation Forecast |
|---|---|
| Sunday | LT 0.25 |
| Sunday Night | 0 |
| Thursday | 0 |
| White Pass | Precipitation Forecast |
|---|---|
| Sunday | LT 0.10 |
| Sunday Night | 0 |
| Thursday | 0 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Sunday | LT 0.10 |
| Sunday Night | 0 |
| Thursday | 0 |
| Timberline | Precipitation Forecast |
|---|---|
| Sunday | LT 0.25 |
| Sunday 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: 7:07 AM PST Sunday, December 6, 2020
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Morning | SW 5 - 15 | S 10 - 20 | W 10 - 20 | W 10 - 20 | W 10 - 20 |
| Sunday Afternoon | SW 0 - 10 | SW 0 - 10 | W 5 - 15 | SW 0 - 10 | W 5 - 15 |
| Sunday Evening | SW 5 - 15 | S 5 - 15 | W 0 - 10 | SW 0 - 10 | SE 0 - 10 |
| Sunday Night | SW 15 - 25 | S 15 - 25 | SE 10 - 20 | SW 10 - 20 | S 5 - 15 |
| Monday Morning | SW 20 - 30 | S 15 - 25 | SE 10 - 2 | --- 10 - 20 | S 5 - 15 |
| Monday Afternoon | SSW 20 - 30 | S 20 - 30 | SW 15 - 25 | SW 15 - 25 | SSW 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Morning | SW 5 - 15 |
| Sunday Afternoon | SW 0 - 10 |
| Sunday Evening | SW 5 - 15 |
| Sunday Night | SW 15 - 25 |
| Monday Morning | SW 20 - 30 |
| Monday Afternoon | SSW 20 - 30 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Morning | S 10 - 20 |
| Sunday Afternoon | SW 0 - 10 |
| Sunday Evening | S 5 - 15 |
| Sunday Night | S 15 - 25 |
| Monday Morning | S 15 - 25 |
| Monday Afternoon | S 20 - 30 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Morning | W 10 - 20 |
| Sunday Afternoon | W 5 - 15 |
| Sunday Evening | W 0 - 10 |
| Sunday Night | SE 10 - 20 |
| Monday Morning | SE 10 - 2 |
| Monday Afternoon | SW 15 - 25 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Morning | W 10 - 20 |
| Sunday Afternoon | SW 0 - 10 |
| Sunday Evening | SW 0 - 10 |
| Sunday Night | SW 10 - 20 |
| Monday Morning | --- 10 - 20 |
| Monday Afternoon | SW 15 - 25 |
| Mt. Hood | Elevation |
|---|---|
| Sunday Morning | W 10 - 20 |
| Sunday Afternoon | W 5 - 15 |
| Sunday Evening | SE 0 - 10 |
| Sunday Night | S 5 - 15 |
| Monday Morning | S 5 - 15 |
| Monday Afternoon | SSW 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Morning | SW 5 - 15 |
| Sunday Afternoon | SW 0 - 10 |
| Sunday Evening | SW 5 - 15 |
| Sunday Night | SW 15 - 25 |
| Monday Morning | SW 20 - 30 |
| Monday Afternoon | SSW 20 - 30 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Morning | S 10 - 20 |
| Sunday Afternoon | SW 0 - 10 |
| Sunday Evening | S 5 - 15 |
| Sunday Night | S 15 - 25 |
| Monday Morning | S 15 - 25 |
| Monday Afternoon | S 20 - 30 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Morning | W 10 - 20 |
| Sunday Afternoon | W 5 - 15 |
| Sunday Evening | W 0 - 10 |
| Sunday Night | SE 10 - 20 |
| Monday Morning | SE 10 - 2 |
| Monday Afternoon | SW 15 - 25 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Morning | W 10 - 20 |
| Sunday Afternoon | SW 0 - 10 |
| Sunday Evening | SW 0 - 10 |
| Sunday Night | SW 10 - 20 |
| Monday Morning | --- 10 - 20 |
| Monday Afternoon | SW 15 - 25 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Morning | W 10 - 20 |
| Sunday Afternoon | W 5 - 15 |
| Sunday Evening | SE 0 - 10 |
| Sunday Night | S 5 - 15 |
| Monday Morning | S 5 - 15 |
| Monday Afternoon | SSW 5 - 15 |
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 Morning | W 15 - 25 | SW 10 - 20 | W 10 - 20 | W 10 - 20 | W 10 - 20 |
| Sunday Afternoon | SW 5 - 15 | SW 5 - 15 | SW 10 - 20 | W 5 - 15 | N 5 - 15 |
| Sunday Evening | WSW 15 - 25 | WSW 15 - 25 | W 10 - 20 | W 5 - 15 | NW 0 - 10 |
| Sunday Night | WSW 30 - 40 | WSW 25 - 35 | W 20 - 30 | W 15 - 25 | W 10 - 20 |
| Monday Morning | SW 35 - 45 | SW 30 - 40 | SW 30 - 40 | WSW 20 - 30 | W 5 - 15 |
| Monday Afternoon | SW 35 - 45 | SW 35 - 45 | SW 35 - 45 | SW 30 - 40 | SW 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Morning | W 15 - 25 |
| Sunday Afternoon | SW 5 - 15 |
| Sunday Evening | WSW 15 - 25 |
| Sunday Night | WSW 30 - 40 |
| Monday Morning | SW 35 - 45 |
| Monday Afternoon | SW 35 - 45 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Morning | SW 10 - 20 |
| Sunday Afternoon | SW 5 - 15 |
| Sunday Evening | WSW 15 - 25 |
| Sunday Night | WSW 25 - 35 |
| Monday Morning | SW 30 - 40 |
| Monday Afternoon | SW 35 - 45 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Morning | W 10 - 20 |
| Sunday Afternoon | SW 10 - 20 |
| Sunday Evening | W 10 - 20 |
| Sunday Night | W 20 - 30 |
| Monday Morning | SW 30 - 40 |
| Monday Afternoon | SW 35 - 45 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Morning | W 10 - 20 |
| Sunday Afternoon | W 5 - 15 |
| Sunday Evening | W 5 - 15 |
| Sunday Night | W 15 - 25 |
| Monday Morning | WSW 20 - 30 |
| Monday Afternoon | SW 30 - 40 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Morning | W 10 - 20 |
| Sunday Afternoon | N 5 - 15 |
| Sunday Evening | NW 0 - 10 |
| Sunday Night | W 10 - 20 |
| Monday Morning | W 5 - 15 |
| Monday Afternoon | SW 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.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Previous forecast from Dec 5, 2020
The NWAC program is administered by the USDA-Forest Service and operates from the National Weather Service Forecast Office in Seattle. NWAC services are made possible by important collaboration and support from a wide variety of federal, state and private cooperators.