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Weather Synopsis for Sunday & Wednesday
The upper low off of Vancouver Island will continue to help steer southern stream moisture into our area today in the form of steady light to moderate snow. Showers on the northern periphery of the steady snow should continue to affect the Olympics and northwest Cascades this morning. An upper level shortwave approaching the California coast today will begin to stand the frontal boundary up, orienting the precipitation shield a bit more N-S oriented than forecast models indicated yesterday. This translates toward slightly higher precipitation forecasts for the south and central Washington Cascades with a bit more light snow reaching the Olympics and north Cascades. As this frontal band reorients, a relative lull in precipitation may occur for the Mt. Hood area later this afternoon and evening along with some warming. Alpine winds are forecast to be very strong in the Mt. Hood area today and tonight. A brief period of E-NE winds is possible for the central-west and northwest Cascades tonight before the flow turns westerly on Monday.
The frontal band should push eastward early Monday morning as steady light to moderate snow for both the east and west slopes of the Cascades is replaced by showers in westerly flow that should favor the west slopes of the Cascades as a broad cold upper trough moves over the PNW.
Weather Forecast
Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Sunday Morning - Sunday Mid-day |
Light to moderate snow showers north Cascades. Light to moderate snow central and south Cascades. |
| Sunday Afternoon - Monday Morning |
Light snow north Cascades. Moderate snow central and south Cascades, highest accumulations likely for the south Cascades. |
| Monday Afternoon - Monday Night |
Mostly cloudy with light to moderate snow showers, tapering down Monday night. |
East slopes of the Washington Cascades
| Sunday Morning - Sunday Mid-day |
Occasional light snow northeast Cascades. Light snow central-east and southeast Cascades. |
| Sunday Afternoon - Monday Morning |
Light snow northeast Cascades. Moderate snow central-east and southeast Cascades. |
| Monday Afternoon - Monday Night |
Mostly cloudy with light snow showers mainly near the Cascade crest, tapering off Monday night. |
Olympics
| Sunday Morning - Sunday Mid-day |
Cloudy with light snow showers. |
| Sunday Afternoon - Monday Morning |
Cloudy with light snow in the afternoon, becoming light snow showers locally moderate north slopes of the Olympics in the evening. |
| Monday Afternoon - Monday Night |
Mostly cloudy with light snow showers, tapering down Monday night. |
Mt. Hood Area
| Sunday Morning |
Moderate rain and snow. Strong alpine winds. |
| Sunday Afternoon - Sunday Evening |
Cloudy with periods of light rain and snow. Warming trend. Strong alpine winds. |
| Sunday Night - Monday Morning |
Light to moderate rain and snow. Slight cooling trend. Strong alpine winds. |
| Monday Afternoon - Monday Night |
Mostly cloudy with light to moderate snow showers, tapering down Monday night. Windy |
Issued: 7:17 AM PST Sunday, February 5, 2017
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 | 1500' | 1500' | 1500' | ' | ' | 2000' | ' | 3500' |
| Sunday Afternoon - Sunday Evening | Snow Level * | 1000' | 1000' | 1000' | ' | ' | 1500' | ' | 5000' |
| Sunday Night - Monday Morning | Snow Level | 0' | 0' | 0' | ' | ' | 500' | ' | 2500' |
| Monday Afternoon - Monday Night | Snow Level | 0' | 0' | 0' | ' | ' | 500' | ' | 1500' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Morning |
Snow Level 1500' |
| Sunday Afternoon - Sunday Evening |
Snow Level 1000' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level 0' |
| Monday Afternoon - Monday Night |
Snow Level 0' |
| Mt. Baker | Elevation |
|---|---|
| Sunday Morning |
Snow Level 1500' |
| Sunday Afternoon - Sunday Evening |
Snow Level 1000' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level 0' |
| Monday Afternoon - Monday Night |
Snow Level 0' |
| Washington Pass | Elevation |
|---|---|
| Sunday Morning |
Snow Level 1500' |
| Sunday Afternoon - Sunday Evening |
Snow Level 1000' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level 0' |
| Monday Afternoon - Monday Night |
Snow Level 0' |
| Leavenworth | Elevation |
|---|---|
| Sunday Morning |
Snow Level ' |
| Sunday Afternoon - Sunday Evening |
Snow Level ' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level ' |
| Monday Afternoon - Monday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Sunday Morning |
Snow Level ' |
| Sunday Afternoon - Sunday Evening |
Snow Level ' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level ' |
| Monday Afternoon - Monday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Morning |
Snow Level 2000' |
| Sunday Afternoon - Sunday Evening |
Snow Level 1500' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level 500' |
| Monday Afternoon - Monday Night |
Snow Level 500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Morning |
Snow Level ' |
| Sunday Afternoon - Sunday Evening |
Snow Level ' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level ' |
| Monday Afternoon - Monday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Sunday Morning |
Snow Level 3500' |
| Sunday Afternoon - Sunday Evening |
Snow Level 5000' (Easterly Flow *) |
| Sunday Night - Monday Morning |
Snow Level 2500' |
| Monday Afternoon - Monday Night |
Snow Level 1500' |
* 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
| Wednesday | Wednesday | |
|---|---|---|
| Hurricane Ridge | 0.25 - 0.50 | LT 0.25 |
| Mt Baker Ski Area | 0.25 - 0.50 | LT 0.25 |
| Washington Pass | 0 - 0.50 | LT 0.25 |
| Stevens Pass | 0 - 0.75 | 0 - 0.50 |
| Snoqualmie Pass | 0 - 1.00 | 0 - 0.75 |
| Mission Ridge | 0 - 0.75 | LT 0.25 |
| Crystal Mt | 1.00 - 1.50 | 0 - 0.50 |
| Paradise | 0 - 1.50 | 0 - 0.75 |
| White Pass | 0 - 1.50 | 0 - 0.75 |
| Mt Hood Meadows | 1.00 - 1.50 | 0.50 - 0.75 |
| Timberline | 1.50 - 2.00 | 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: 7:17 AM PST Sunday, February 5, 2017
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Morning | SSW 5 - 15 | SW 5 - 15 | SW 15 - 25 | --- - | SW 10 - 20 |
| Sunday Afternoon | E 5 - 15 | E 0 - 10 | E 5 - 15 | --- - | SW 15 - 25 |
| Sunday Night - Monday Morning | NE 5 - 15 | NE 10 - 20 | E 10 - 20 | --- - | SW 15 - 25 |
| Monday Afternoon | SW 5 - 15 | S 0 - 10 | SW 15 - 25 | --- - | SW 30 - 40 |
| Monday Night | SW 10 - 20 | SW 10 - 20 | WSW 15 - 30 | --- - | WSW 15 - 30 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Morning | SSW 5 - 15 |
| Sunday Afternoon | E 5 - 15 |
| Sunday Night - Monday Morning | NE 5 - 15 |
| Monday Afternoon | SW 5 - 15 |
| Monday Night | SW 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Morning | SW 5 - 15 |
| Sunday Afternoon | E 0 - 10 |
| Sunday Night - Monday Morning | NE 10 - 20 |
| Monday Afternoon | S 0 - 10 |
| Monday Night | SW 10 - 20 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Morning | SW 15 - 25 |
| Sunday Afternoon | E 5 - 15 |
| Sunday Night - Monday Morning | E 10 - 20 |
| Monday Afternoon | SW 15 - 25 |
| Monday Night | WSW 15 - 30 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Morning | --- - |
| Sunday Afternoon | --- - |
| Sunday Night - Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Sunday Morning | SW 10 - 20 |
| Sunday Afternoon | SW 15 - 25 |
| Sunday Night - Monday Morning | SW 15 - 25 |
| Monday Afternoon | SW 30 - 40 |
| Monday Night | WSW 15 - 30 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Morning | SSW 5 - 15 |
| Sunday Afternoon | E 5 - 15 |
| Sunday Night - Monday Morning | NE 5 - 15 |
| Monday Afternoon | SW 5 - 15 |
| Monday Night | SW 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Morning | SW 5 - 15 |
| Sunday Afternoon | E 0 - 10 |
| Sunday Night - Monday Morning | NE 10 - 20 |
| Monday Afternoon | S 0 - 10 |
| Monday Night | SW 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Morning | SW 15 - 25 |
| Sunday Afternoon | E 5 - 15 |
| Sunday Night - Monday Morning | E 10 - 20 |
| Monday Afternoon | SW 15 - 25 |
| Monday Night | WSW 15 - 30 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Morning | --- - |
| Sunday Afternoon | --- - |
| Sunday Night - Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Morning | SW 10 - 20 |
| Sunday Afternoon | SW 15 - 25 |
| Sunday Night - Monday Morning | SW 15 - 25 |
| Monday Afternoon | SW 30 - 40 |
| Monday Night | WSW 15 - 30 |
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 | SW 15 - 25 | SW 30 - 40 | SW 35 - 50 | --- - | SW 50 - 60 |
| Sunday Afternoon | SW 5 - 15 | SW 5 - 15 | SW 20 - 30 | --- - | SW 60 - 70 |
| Sunday Night - Monday Morning | SSW 10 - 20 | SW 15 - 25 | SW 25 - 35 | --- - | SW 50 - 60 |
| Monday Afternoon - Monday Night | W 15 - 25 | SW 10 - 20 | SW 35 - 45 | --- - | WSW 40 - 50 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Morning | SW 15 - 25 |
| Sunday Afternoon | SW 5 - 15 |
| Sunday Night - Monday Morning | SSW 10 - 20 |
| Monday Afternoon - Monday Night | W 15 - 25 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Morning | SW 30 - 40 |
| Sunday Afternoon | SW 5 - 15 |
| Sunday Night - Monday Morning | SW 15 - 25 |
| Monday Afternoon - Monday Night | SW 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Morning | SW 35 - 50 |
| Sunday Afternoon | SW 20 - 30 |
| Sunday Night - Monday Morning | SW 25 - 35 |
| Monday Afternoon - Monday Night | SW 35 - 45 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Morning | --- - |
| Sunday Afternoon | --- - |
| Sunday Night - Monday Morning | --- - |
| Monday Afternoon - Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Morning | SW 50 - 60 |
| Sunday Afternoon | SW 60 - 70 |
| Sunday Night - Monday Morning | SW 50 - 60 |
| Monday Afternoon - Monday Night | WSW 40 - 50 |
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 Feb 4, 2017
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.