Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Tuesday & Wednesday
Warm frontal moisture overriding an E-W oriented baroclinic zone near the WA/OR border will continue to produce light snow for the south and central Washington Cascades and Mt. Hood this morning. This boundary is expected to shift south today bringing steady light snow to an end. Light and scattered mountain showers currently affecting the mountain loop area and Stevens and Snoqualmie Passes should shift a bit south and continue through the afternoon with mostly clear conditions over the north Cascades.
A brief shot of arctic air will begin filtering into the region later today and tonight as strong high pressure currently situated over British Columbia slides south and into eastern Washington and Oregon over the next two days. While drier and sunnier conditions are expected on Wednesday outside of Mt. Hood and the far south Washington Cascades, easterly offshore flow will begin to really crank up Wednesday afternoon and night beginning a period of moderate easterly winds.
Weather Forecast
Olympics
| Tuesday - Wednesday Night |
Mostly clear and cold. |
Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Tuesday Afternoon |
Mostly sunny north Cascades. Partly to mostly cloudy central and south Washington Cascades with scattered light snow showers. |
| Tuesday Night |
Clear north Cascades. Partly to mostly clear central and south Cascades with isolated light snow showers ending in the evening. Cold. |
| Wednesday - Wednesday Night |
Mostly clear and north and central Cascades. Partly to mostly cloudy south Washington Cascades. East winds increasing Wednesday afternoon and night. |
East slopes of the Washington Cascades
| Tuesday Afternoon - Tuesday Evening |
Partly cloudy northeast Cascades. Mostly cloudy central and south Washington Cascades with isolated light snow showers. |
| Tuesday Night |
Mostly clear and cold. |
| Wednesday - Wednesday Night |
Mostly clear and northeast and central-east Cascades. Partly to mostly cloudy southeast Washington Cascades. |
Mt. Hood Area
| Tuesday |
Cloudy with periods of light snow becoming mostly cloudy with scattered light snow showers in the afternoon. Cooling trend. Strong alpine winds this morning easing a bit in the afternoon. |
| Tuesday Night - Wednesday Morning |
Mostly cloudy. Colder. |
| Wednesday Afternoon - Wednesday Night |
Cloudy with periods of light snow. East winds increasing Wednesday afternoon and night. |
Issued: 1:43 PM PST Tuesday, January 31, 2017
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Tuesday Afternoon | Snow Level | 500' | 500' | 0' | ' | ' | 1000' | ' | 2500' |
| Tuesday Night - Wednesday Night | Freezing Level * | 0' | 0' | 0' | ' | ' | 0' | ' | 0' |
| Hurricane Ridge | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level 500' |
| Tuesday Night - Wednesday Night |
Freezing Level 0' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level 500' |
| Tuesday Night - Wednesday Night |
Freezing Level 0' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level 0' |
| Tuesday Night - Wednesday Night |
Freezing Level 0' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night - Wednesday Night |
Freezing Level ' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night - Wednesday Night |
Freezing Level ' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level 1000' |
| Tuesday Night - Wednesday Night |
Freezing Level 0' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night - Wednesday Night |
Freezing Level ' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Afternoon |
Snow Level 2500' |
| Tuesday Night - Wednesday Night |
Freezing Level 0' (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
| Wednesday | Wednesday | |
|---|---|---|
| Hurricane Ridge | LT 0.10 | LT 0.10 |
| Mt Baker Ski Area | LT 0.10 | LT 0.10 |
| Washington Pass | LT 0.10 | LT 0.10 |
| Stevens Pass | LT 0.10 | LT 0.10 |
| Snoqualmie Pass | LT 0.10 | LT 0.10 |
| Mission Ridge | LT 0.25 | LT 0.10 |
| Crystal Mt | LT 0.10 | LT 0.10 |
| Paradise | LT 0.10 | LT 0.10 |
| White Pass | LT 0.10 | LT 0.10 |
| Mt Hood Meadows | LT 0.10 | LT 0.25 |
| Timberline | LT 0.10 | LT 0.25 |
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: 1:43 PM PST Tuesday, January 31, 2017
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Tuesday Afternoon | NE 10 - 20 | NE 10 - 20 | E 0 - 10 | --- - | VAR 0 - 10 |
| Tuesday Night - Wednesday Morning | NE 10 - 20 | NE 10 - 20 | E 5 - 15 | --- - | E 5 - 15 |
| Wednesday Afternoon - Wednesday Night | E 15 - 25 | ENE 10 - 20 | E 20 - 30 | --- - | E 15 - 25 |
| Hurricane Ridge | Elevation |
|---|---|
| Tuesday Afternoon | NE 10 - 20 |
| Tuesday Night - Wednesday Morning | NE 10 - 20 |
| Wednesday Afternoon - Wednesday Night | E 15 - 25 |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Afternoon | NE 10 - 20 |
| Tuesday Night - Wednesday Morning | NE 10 - 20 |
| Wednesday Afternoon - Wednesday Night | ENE 10 - 20 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Afternoon | E 0 - 10 |
| Tuesday Night - Wednesday Morning | E 5 - 15 |
| Wednesday Afternoon - Wednesday Night | E 20 - 30 |
| Mt. Rainier | Elevation |
|---|---|
| Tuesday Afternoon | --- - |
| Tuesday Night - Wednesday Morning | --- - |
| Wednesday Afternoon - Wednesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Afternoon | VAR 0 - 10 |
| Tuesday Night - Wednesday Morning | E 5 - 15 |
| Wednesday Afternoon - Wednesday Night | E 15 - 25 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Tuesday Afternoon | NE 10 - 20 |
| Tuesday Night - Wednesday Morning | NE 10 - 20 |
| Wednesday Afternoon - Wednesday Night | E 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Tuesday Afternoon | NE 10 - 20 |
| Tuesday Night - Wednesday Morning | NE 10 - 20 |
| Wednesday Afternoon - Wednesday Night | ENE 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Tuesday Afternoon | E 0 - 10 |
| Tuesday Night - Wednesday Morning | E 5 - 15 |
| Wednesday Afternoon - Wednesday Night | E 20 - 30 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Tuesday Afternoon | --- - |
| Tuesday Night - Wednesday Morning | --- - |
| Wednesday Afternoon - Wednesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Tuesday Afternoon | VAR 0 - 10 |
| Tuesday Night - Wednesday Morning | E 5 - 15 |
| Wednesday Afternoon - Wednesday Night | E 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 | |
|---|---|---|---|---|---|
| Tuesday Afternoon | NE 5 - 15 | N 5 - 15 | NW 0 - 10 | --- - | W 25 - 35 |
| Tuesday Night - Wednesday Morning | ENE 15 - 25 | NE 10 - 20 | E 5 - 15 | --- - | SW 20 - 30 |
| Wednesday Afternoon - Wednesday Night | E 15 - 25 | E 10 - 20 | E 10 - 20 | --- - | SW 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Tuesday Afternoon | NE 5 - 15 |
| Tuesday Night - Wednesday Morning | ENE 15 - 25 |
| Wednesday Afternoon - Wednesday Night | E 15 - 25 |
| Washington Pass | Direction - Speed |
|---|---|
| Tuesday Afternoon | N 5 - 15 |
| Tuesday Night - Wednesday Morning | NE 10 - 20 |
| Wednesday Afternoon - Wednesday Night | E 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Tuesday Afternoon | NW 0 - 10 |
| Tuesday Night - Wednesday Morning | E 5 - 15 |
| Wednesday Afternoon - Wednesday Night | E 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Tuesday Afternoon | --- - |
| Tuesday Night - Wednesday Morning | --- - |
| Wednesday Afternoon - Wednesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Tuesday Afternoon | W 25 - 35 |
| Tuesday Night - Wednesday Morning | SW 20 - 30 |
| Wednesday Afternoon - Wednesday Night | SW 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.
Issued: 1:43 PM PST Tuesday, January 31, 2017
Extended Weather Synopsis for Wednesday night through Wednesday
The pattern of cold and clear offshore flow will continue through Thursday with east winds peaking in intensity Thursday morning at Cascades Pass level and at crest level especially for the south and central Washington Cascades. Down at Mt. Hood, moderate east winds are also expected up to mid-mountain but skies should remain cloudy. The upper level low off the California coast will meander closer to the coastline on Thursday night with showers and increasing clouds finally beginning to rotate northward. Temperatures will begin to moderate Friday but it won't be until Saturday that relatively milder Pacific air mixes inland. A deep upper level low in the northern branch of the jet is forecast to dive off of the southern B.C. coast Saturday, directing heavier showers and Pacific air into the region and switching the flow in the Passes from east to west.
Extended Weather
Olympics, Washington Cascades and Mt. Hood
Mostly sunny and cold Olympics and Washington Cascades. Moderate to occasionally strong east winds Cascade Passes and south and central Cascades up to crest level. Mostly cloudy with breezy east winds Mt. Hood.
Increasing clouds with light to occasionally moderate snow showers Mt. Hood spreading northward overnight.
Cloudy with light to moderate rain and snow showers, occasionally heavy along the west slopes and Mt. Hood. Slow warming trend.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Thursday - Thursday Night | Freezing Level | 0' - 1000' | 0' - 0' | 0' - 0' | * |
| Friday | Snow Level | 1000' - 2000' | 500' - 1500' | 1500' - 2500' | * |
| Friday Night | Snow Level | 1000' - 2000' | 2000' - 4000' | 5000' - 6000' | * |
| Saturday | Snow Level | 1500' - 2500' | 2000' - 3000' | 4500' - 5500' |
| Mt. Baker | Elevation |
|---|---|
| Thursday - Thursday Night |
Freezing Level 0' - 1000' (Easterly Flow *) |
| Friday |
Snow Level 1000' - 2000' (Easterly Flow *) |
| Friday Night |
Snow Level 1000' - 2000' (Easterly Flow *) |
| Saturday |
Snow Level 1500' - 2500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Thursday - Thursday Night |
Freezing Level 0' - 0' (Easterly Flow *) |
| Friday |
Snow Level 500' - 1500' (Easterly Flow *) |
| Friday Night |
Snow Level 2000' - 4000' (Easterly Flow *) |
| Saturday |
Snow Level 2000' - 3000' |
| Mt. Hood | Elevation |
|---|---|
| Thursday - Thursday Night |
Freezing Level 0' - 0' (Easterly Flow *) |
| Friday |
Snow Level 1500' - 2500' (Easterly Flow *) |
| Friday Night |
Snow Level 5000' - 6000' (Easterly Flow *) |
| Saturday |
Snow Level 4500' - 5500' |
* 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 Jan 31, 2017
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