Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Monday & Monday
Snow levels will gradually fall overnight and settle around 4000 feet on Monday. A quasi-stationary band of rain and snow re-developed mid-day and will continue to focus rain and snow on the west slopes of the Cascades, mainly from the central Cascades northward on a W-NW flow. Light new snowfall accumulations expected above 4000 feet for Snoqualmie Pass to Mt. Baker. Increasingly light precipitation should spread southward overnight Monday on a weakening flow.
NW flow will keep plenty of moisture and clouds banked up along the west slopes of the Cascades Monday and Monday night, with Hurricane Ridge, Hood, and the east slopes potentially breaking into clear skies at times. The ridge will amplify offshore on Monday and begin to slide back towards the PNW Monday night, helping to decrease shower activity.
On Tuesday, the ridge slides further east, further decreasing the already light shower activity. During the afternoon, a weak surface feature begins to spread light rain to the North Cascades with light precipitation increasing slightly Tuesday night in the Olympics and North Cascades.
Tuesday night, a weak shortwave sliding over the offshore ridge will pass mostly north of Washington state, keeping showers in the forecast for the northern portions of the Cascades as areas further south remain drier. The shortwave will increase W winds into the moderate range.
Weather Forecast
Olympics
| Monday | Cloudy, chance of light rain or snow showers. |
| Monday Night | Cloudy, chance of a light rain or snow shower. |
| Tuesday | Cloudy, chance of light rain or snow. |
| Tuesday Night | Increasing light rain or snow before midnight; decreasing after midnight. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Monday | Light rain and snow from the central Cascades northward; heaviest in convergence and away from the crest. Elsewhere, mostly cloudy with a chance of light rain or snow showers. |
| Monday Night | Decreasing light rain and snow showers, with rain and snow showers focused on the central Cascades. |
| Tuesday | Light rain and snow, central and mainly north Cascades. Cloudy south Cascades. |
| Tuesday Night | Light to occasional moderate rain and snow central and north; heaviest near the Canadian border. |
East Slopes of the Washington Cascades
| Monday | Light rain and snow at higher elevations, heaviest central and north. Cloudy near the Cascade crest with mostly sunny skies east of the Cascade crest. |
| Monday Night | Decreasing Light rain and snow, heaviest central and north. Cloudy near the Cascade crest with mostly clear skies east of the Cascade crest. |
| Tuesday | A few showers lingering in the morning at high elevations, north and central parts. Increasing light rain and snow in the north at high elevations in the afternoon. Cloudy near the Cascade crest with mostly clear skies east of the Cascade crest. |
| Tuesday Night | Very light rain and snow at high elevations, north and central parts. |
Mt. Hood
| Monday | Partly cloudy. |
| Monday Night | Partly clear. |
| Tuesday | Partly cloudy. |
| Tuesday Night | Partly clear. |
Issued: 2:35 PM PST Monday, February 5, 2018
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Monday Afternoon | Snow Level | 4000' | 3500' | 4000' | ' | ' | 3500' | ' | 4000' |
| Monday Night | Snow Level | 4000' | 3500' | 2500' | ' | ' | 3000' | ' | 3500' |
| Tuesday Morning | Snow Level | 5000' | 3500' | 4000' | ' | ' | 3000' | ' | 4000' |
| Tuesday Afternoon | Snow Level | 5000' | 3500' | 4000' | ' | ' | 3500' | ' | 7500' |
| Tuesday Night | Snow Level | 6000' | 4500' | 4000' | ' | ' | 4500' | ' | 7000' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 4000' |
| Monday Night |
Snow Level 4000' |
| Tuesday Morning |
Snow Level 5000' |
| Tuesday Afternoon |
Snow Level 5000' |
| Tuesday Night |
Snow Level 6000' |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3500' |
| Monday Night |
Snow Level 3500' |
| Tuesday Morning |
Snow Level 3500' |
| Tuesday Afternoon |
Snow Level 3500' |
| Tuesday Night |
Snow Level 4500' |
| Washington Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 4000' |
| Monday Night |
Snow Level 2500' |
| Tuesday Morning |
Snow Level 4000' |
| Tuesday Afternoon |
Snow Level 4000' |
| Tuesday Night |
Snow Level 4000' |
| Leavenworth | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' |
| Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' |
| Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3500' |
| Monday Night |
Snow Level 3000' |
| Tuesday Morning |
Snow Level 3000' |
| Tuesday Afternoon |
Snow Level 3500' |
| Tuesday Night |
Snow Level 4500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' |
| Monday Night |
Snow Level ' |
| Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 4000' |
| Monday Night |
Snow Level 3500' |
| Tuesday Morning |
Snow Level 4000' |
| Tuesday Afternoon |
Snow Level 7500' |
| Tuesday Night |
Snow Level 7000' |
* 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
| Monday | Monday | |
|---|---|---|
| Hurricane Ridge | LT 0.10 | LT 0.10 |
| Mt Baker Ski Area | 0.25 - 0.50 | 0.25 - 0.50 |
| Washington Pass | LT 0.25 | LT 0.25 |
| Stevens Pass | LT 0.25 | LT 0.25 |
| Snoqualmie Pass | 0 - 0.50 | LT 0.25 |
| Mission Ridge | LT 0.10 | LT 0.10 |
| Crystal Mt | LT 0.10 | LT 0.10 |
| Paradise | LT 0.25 | LT 0.10 |
| White Pass | LT 0.25 | LT 0.10 |
| Mt Hood Meadows | LT 0.10 | LT 0.10 |
| Timberline | LT 0.10 | LT 0.10 |
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: 2:35 PM PST Monday, February 5, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Afternoon | W 20 - 30 | W 5 - 15 | W 15 - 25 | --- - | W 20 - 30 |
| Monday Night | W 10 - 20 | W 5 - 15 | W 10 - 20 | --- - | W 20 - 30 |
| Tuesday Morning | W 5 - 15 | WSW 5 - 15 | W 5 - 15 | --- - | WNW 5 - 15 |
| Tuesday Afternoon | WNW 15 - 25 | WSW 5 - 15 | W 10 - 20 | --- - | W 10 - 20 |
| Tuesday Night | W 15 - 25 | WSW 10 - 20 | W 10 - 20 | --- - | W 15 - 25 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon | W 20 - 30 |
| Monday Night | W 10 - 20 |
| Tuesday Morning | W 5 - 15 |
| Tuesday Afternoon | WNW 15 - 25 |
| Tuesday Night | W 15 - 25 |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon | W 5 - 15 |
| Monday Night | W 5 - 15 |
| Tuesday Morning | WSW 5 - 15 |
| Tuesday Afternoon | WSW 5 - 15 |
| Tuesday Night | WSW 10 - 20 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon | W 15 - 25 |
| Monday Night | W 10 - 20 |
| Tuesday Morning | W 5 - 15 |
| Tuesday Afternoon | W 10 - 20 |
| Tuesday Night | W 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon | W 20 - 30 |
| Monday Night | W 20 - 30 |
| Tuesday Morning | WNW 5 - 15 |
| Tuesday Afternoon | W 10 - 20 |
| Tuesday Night | W 15 - 25 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Afternoon | W 20 - 30 |
| Monday Night | W 10 - 20 |
| Tuesday Morning | W 5 - 15 |
| Tuesday Afternoon | WNW 15 - 25 |
| Tuesday Night | W 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | W 5 - 15 |
| Monday Night | W 5 - 15 |
| Tuesday Morning | WSW 5 - 15 |
| Tuesday Afternoon | WSW 5 - 15 |
| Tuesday Night | WSW 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | W 15 - 25 |
| Monday Night | W 10 - 20 |
| Tuesday Morning | W 5 - 15 |
| Tuesday Afternoon | W 10 - 20 |
| Tuesday Night | W 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | W 20 - 30 |
| Monday Night | W 20 - 30 |
| Tuesday Morning | WNW 5 - 15 |
| Tuesday Afternoon | W 10 - 20 |
| Tuesday Night | W 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 | |
|---|---|---|---|---|---|
| Monday Afternoon | W 15 - 25 | W 20 - 30 | WNW 30 - 40 | --- - | WNW 45 - 65 |
| Monday Night | W 10 - 20 | W 20 - 30 | WNW 35 - 50 | --- - | NW 35 - 50 |
| Tuesday Morning | WNW 20 - 30 | WNW 15 - 25 | WNW 40 - 60 | --- - | NW 25 - 35 |
| Tuesday Afternoon | W 25 - 35 | W 30 - 40 | WNW 40 - 60 | --- - | WNW 30 - 40 |
| Tuesday Night | WNW 30 - 40 | WNW 35 - 50 | WNW 40 - 60 | --- - | NW 40 - 60 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | W 15 - 25 |
| Monday Night | W 10 - 20 |
| Tuesday Morning | WNW 20 - 30 |
| Tuesday Afternoon | W 25 - 35 |
| Tuesday Night | WNW 30 - 40 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Afternoon | W 20 - 30 |
| Monday Night | W 20 - 30 |
| Tuesday Morning | WNW 15 - 25 |
| Tuesday Afternoon | W 30 - 40 |
| Tuesday Night | WNW 35 - 50 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | WNW 30 - 40 |
| Monday Night | WNW 35 - 50 |
| Tuesday Morning | WNW 40 - 60 |
| Tuesday Afternoon | WNW 40 - 60 |
| Tuesday Night | WNW 40 - 60 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | WNW 45 - 65 |
| Monday Night | NW 35 - 50 |
| Tuesday Morning | NW 25 - 35 |
| Tuesday Afternoon | WNW 30 - 40 |
| Tuesday Night | NW 40 - 60 |
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: 2:35 PM PST Monday, February 5, 2018
Extended Weather Synopsis for Monday night through Monday
Showers decrease Wednesday in the northern portions of the Cascades as the shortwave exits the region and the offshore high pressure builds into our region. Significant warming is expected, particularly in the Olympics, South Cascades, and Hood areas.
Wednesday night features mostly dry weather.
On Thursday, an upper shortwave and surface cold front slides down the back side of the offshore ridge and arrives on a NW flow, bringing some initial cooling to the Olympics and west slopes of the Cascades, some precipitation, along with moderate to strong crest-level flow. The ridge re-builds offshore.
Thursday night, the cold front passes through the Cascades, ushering in a much colder air mass along with light post-frontal showers in convergence.
On Friday, light post-frontal showers continue as the offshore ridge, slides eastward and begins to cut them off. Very cold air is in place in the northeast Cascades.
Extended Weather
Olympics, Washington Cascades and Mt. Hood Area
Wednesday Mostly cloudy west slopes of the Cascades with very light rain or snow possible in the north Cascades. Mostly cloudy west slopes of the Cascades overnight with little or no rain or snow. Thursday Increasing light to moderate rain or snow arriving first in the north then central Cascades. Light to occasionally moderate rain and snow weakening as it heads south overnight. Light to moderate post-frontal showers developing along the Cascade west slopes after midnight. Some convergence. Friday Rapidly decreasing, light post-frontal snow showers.Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Wednesday | Snow Level | 4000' - 5000' | 5000' - 6500' | 8500' - 9500' | |
| Wednesday Night | Snow Level | 5500' - 6500' | 6500' - 7500' | 8000' - 9000' | |
| Thursday | Snow Level | 3000' - 4000' | 5000' - 7000' | 8000' - 9000' | |
| Thursday Night | Snow Level | 3000' - 4000' | 4000' - 5000' | 7000' - 9000' | |
| Friday | Snow Level | 2000' - 3000' | 2000' - 3000' | 3500' - 4500' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday |
Snow Level 4000' - 5000' |
| Wednesday Night |
Snow Level 5500' - 6500' |
| Thursday |
Snow Level 3000' - 4000' |
| Thursday Night |
Snow Level 3000' - 4000' |
| Friday |
Snow Level 2000' - 3000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday |
Snow Level 5000' - 6500' |
| Wednesday Night |
Snow Level 6500' - 7500' |
| Thursday |
Snow Level 5000' - 7000' |
| Thursday Night |
Snow Level 4000' - 5000' |
| Friday |
Snow Level 2000' - 3000' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday |
Snow Level 8500' - 9500' |
| Wednesday Night |
Snow Level 8000' - 9000' |
| Thursday |
Snow Level 8000' - 9000' |
| Thursday Night |
Snow Level 7000' - 9000' |
| Friday |
Snow Level 3500' - 4500' |
* 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 Feb 5, 2018
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