Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Weather Synopsis for Sunday & Sunday
A frontal system sagging south through the Washington Cascades Saturday night delivered some nice snow totals for the Olympics, the west slopes of the Cascades and Mt. Hood. Through 4 am Sunday morning, new snow totals generally ranged from 8 - 20 inches for the aforementioned areas. A convergence zone north of the frontal band and currently trained on the central Cascades including Snoqualmie Pass, will quickly shift south by mid-morning as the flow becomes more northwesterly. The heaviest shower activity will continue for the longest down at Mt. Hood, otherwise a north-south parital clearing trend is expected today with much colder air moving into the region.
A strong 125 kt jet currently directed into Washington this morning will drop south and into central Oregon by Sunday afternoon. The PNW will be on the backside of a cold upper trough; the coldest air mass by far this season will be over the region beginning Sunday evening. A weak front should swing down the backside of the trough on Monday. Generally light accumulations of snow are possible through mid-day Monday with showers becoming more scattered Monday afternoon and evening. While shower activity will generally be dying down overnight, there may be some light upslope snowfall along the north slopes of the Olympics with a bit of Fraser outflow developing Monday night.
Weather Forecast
Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Sunday Morning |
Mostly cloudy with isolated snow showers north Cascades. Cloudy with light to moderate snow showers central and south Washington Cascades. Moderate westerly ridgetop winds. |
| Sunday Afternoon - Sunday Night |
Becoming partly cloudy Sunday afternoon from north to south with isolated light snow showers. Colder. |
| Monday Morning |
Cloudy with light snow showers. |
| Monday Afternoon - Monday Night |
Mostly cloudy with scattered light snow showers tapering off Monday night. |
East slopes of the Washington Cascades
| Sunday Morning |
Partly cloudy with isolated light snow showers northeast Cascades. Cloudy with light snow showers central-east and southeast Washington Cascades. Moderate westerly ridgetop winds. |
| Sunday Afternoon - Sunday Night |
Becoming partly to mostly sunny Sunday afternoon from north to south. Colder. |
| Monday Morning |
Cloudy with light snow showers developing. |
| Monday Afternoon - Monday Night |
Parlty to mostly cloudy with scattered light snow showers tapering off Monday night. |
Mt. Hood Area
| Sunday Morning |
Moderate snow showers. Moderate to occasionally strong westerly winds. |
| Sunday Afternoon - Sunday Night |
Mostly cloudy with scattered light snow showers. Colder. |
| Monday Morning |
Cloudy with light snow showers. |
| Monday Afternoon - Monday Night |
Mostly cloudy with scattered light snow showers tapering off Monday night. |
Olympics
| Sunday |
Partly to mostly cloudy with scattered light snow showers. Colder. |
| Sunday Night - Monday Morning |
Becoming cloudy with light snow showers increasing after midnight. |
| Monday Afternoon |
Mostly cloudy with scattered light snow showers. |
| Monday Night |
Mostly cloudy with light to occasionally moderate snow showers north slopes of the Olympics. |
Issued: 7:00 AM PST Sunday, December 4, 2016
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 | 2000' | 1000' | 1500' | ' | ' | 1500' | ' | 3500' |
| Sunday Afternoon | Snow Level | 1000' | 500' | 500' | ' | ' | 1000' | ' | 2000' |
| Sunday Night - Monday Night | Snow Level | 1000' | 500' | 0' | ' | ' | 500' | ' | 1000' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Morning |
Snow Level 2000' |
| Sunday Afternoon |
Snow Level 1000' |
| Sunday Night - Monday Night |
Snow Level 1000' |
| Mt. Baker | Elevation |
|---|---|
| Sunday Morning |
Snow Level 1000' |
| Sunday Afternoon |
Snow Level 500' |
| Sunday Night - Monday Night |
Snow Level 500' |
| Washington Pass | Elevation |
|---|---|
| Sunday Morning |
Snow Level 1500' |
| Sunday Afternoon |
Snow Level 500' |
| Sunday Night - Monday Night |
Snow Level 0' |
| Leavenworth | Elevation |
|---|---|
| Sunday Morning |
Snow Level ' |
| Sunday Afternoon |
Snow Level ' |
| Sunday Night - Monday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Sunday Morning |
Snow Level ' |
| Sunday Afternoon |
Snow Level ' |
| Sunday Night - Monday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Morning |
Snow Level 1500' |
| Sunday Afternoon |
Snow Level 1000' |
| Sunday Night - Monday Night |
Snow Level 500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Morning |
Snow Level ' |
| Sunday Afternoon |
Snow Level ' |
| Sunday Night - Monday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Sunday Morning |
Snow Level 3500' |
| Sunday Afternoon |
Snow Level 2000' |
| Sunday Night - Monday Night |
Snow Level 1000' |
* 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 | |
|---|---|---|
| Hurricane Ridge | LT 0.25 | 0.25 - 0.50 |
| Mt Baker Ski Area | LT 0.25 | LT 0.25 |
| Washington Pass | LT 0.10 | LT 0.25 |
| Stevens Pass | 0 - 0.50 | LT 0.25 |
| Snoqualmie Pass | 0.50 - 0.75 | LT 0.25 |
| Mission Ridge | LT 0.10 | LT 0.25 |
| Crystal Mt | 0 - 0.50 | LT 0.25 |
| Paradise | 0 - 0.50 | 0.25 - 0.50 |
| White Pass | 0 - 0.50 | 0.25 - 0.50 |
| Mt Hood Meadows | 1.00 - 1.50 | 0.50 - 0.75 |
| Timberline | 0 - 1.50 | 0 - 0.75 |
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: 7:00 AM PST Sunday, December 4, 2016
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Morning | NW 15 - 25 | WNW 5 - 15 | NW 15 - 30 | --- - | WSW 25 - 35 |
| Sunday Afternoon - Sunday Evening | NW 10 - 20 | WNW 0 - 10 | NW 10 - 20 | --- - | NW 15 - 25 |
| Sunday Night - Monday Morning | SW 5 - 15 | S 0 - 10 | SW 5 - 15 | --- - | W 10 - 20 |
| Monday - Monday Night | N 0 - 10 | ENE 5 - 15 | VAR 0 - 10 | --- - | W 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Morning | NW 15 - 25 |
| Sunday Afternoon - Sunday Evening | NW 10 - 20 |
| Sunday Night - Monday Morning | SW 5 - 15 |
| Monday - Monday Night | N 0 - 10 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Morning | WNW 5 - 15 |
| Sunday Afternoon - Sunday Evening | WNW 0 - 10 |
| Sunday Night - Monday Morning | S 0 - 10 |
| Monday - Monday Night | ENE 5 - 15 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Morning | NW 15 - 30 |
| Sunday Afternoon - Sunday Evening | NW 10 - 20 |
| Sunday Night - Monday Morning | SW 5 - 15 |
| Monday - Monday Night | VAR 0 - 10 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Morning | --- - |
| Sunday Afternoon - Sunday Evening | --- - |
| Sunday Night - Monday Morning | --- - |
| Monday - Monday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Sunday Morning | WSW 25 - 35 |
| Sunday Afternoon - Sunday Evening | NW 15 - 25 |
| Sunday Night - Monday Morning | W 10 - 20 |
| Monday - Monday Night | W 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Morning | NW 15 - 25 |
| Sunday Afternoon - Sunday Evening | NW 10 - 20 |
| Sunday Night - Monday Morning | SW 5 - 15 |
| Monday - Monday Night | N 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Morning | WNW 5 - 15 |
| Sunday Afternoon - Sunday Evening | WNW 0 - 10 |
| Sunday Night - Monday Morning | S 0 - 10 |
| Monday - Monday Night | ENE 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Morning | NW 15 - 30 |
| Sunday Afternoon - Sunday Evening | NW 10 - 20 |
| Sunday Night - Monday Morning | SW 5 - 15 |
| Monday - Monday Night | VAR 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Morning | --- - |
| Sunday Afternoon - Sunday Evening | --- - |
| Sunday Night - Monday Morning | --- - |
| Monday - Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Morning | WSW 25 - 35 |
| Sunday Afternoon - Sunday Evening | NW 15 - 25 |
| Sunday Night - Monday Morning | W 10 - 20 |
| Monday - Monday Night | W 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 25 - 35 | W 35 - 45 | WNW 35 - 50 | --- - | W 45 - 60 |
| Sunday Afternoon - Sunday Evening | NW 15 - 25 | NW 10 - 20 | NW 35 - 45 | --- - | NW 30 - 40 |
| Sunday Night - Monday Morning | SW 5 - 15 | W 10 - 20 | W 15 - 25 | --- - | W 20 - 30 |
| Monday Afternoon | E 0 - 10 | E 0 - 10 | W 5 - 15 | --- - | W 15 - 25 |
| Monday Night | NE 5 - 15 | NE 0 - 10 | NE 0 - 10 | --- - | NW 5 - 15 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Morning | W 25 - 35 |
| Sunday Afternoon - Sunday Evening | NW 15 - 25 |
| Sunday Night - Monday Morning | SW 5 - 15 |
| Monday Afternoon | E 0 - 10 |
| Monday Night | NE 5 - 15 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Morning | W 35 - 45 |
| Sunday Afternoon - Sunday Evening | NW 10 - 20 |
| Sunday Night - Monday Morning | W 10 - 20 |
| Monday Afternoon | E 0 - 10 |
| Monday Night | NE 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Morning | WNW 35 - 50 |
| Sunday Afternoon - Sunday Evening | NW 35 - 45 |
| Sunday Night - Monday Morning | W 15 - 25 |
| Monday Afternoon | W 5 - 15 |
| Monday Night | NE 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Morning | --- - |
| Sunday Afternoon - Sunday Evening | --- - |
| Sunday Night - Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Morning | W 45 - 60 |
| Sunday Afternoon - Sunday Evening | NW 30 - 40 |
| Sunday Night - Monday Morning | W 20 - 30 |
| Monday Afternoon | W 15 - 25 |
| Monday Night | NW 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.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Previous forecast from Dec 3, 2016
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.