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 & Tuesday
A weak upper and surface ridge moved over the Northwest on Sunday. Judging by the RH's at the NWAC weather stations the clouds didn't let up much west of the Cascade crest but it looks like it was a nice day east of the crest.
A weak front crossed the Northwest Sunday night and spread some light to moderate rain and snow to Mt Hood Sunday night and some light rain and snow to the Olympics and Washington Cascades Monday morning. Temporary decreases in light rain or snow should generally be seen following the front.
A weak upper and surface trough and cool slightly unstable air mass will move east across the Northwest Monday and Monday evening. This will cause bands of showers and a chance of thunderstorms near and west of the Cascade crest. The Sunday afternoon UW WRF model indicates convergence between Mt Baker and Stevens Pass Monday evening.
A weak upper and surface ridge will cross the Northwest and give a minor break in the weather on Tuesday morning with some sun and and slightly warmer temperatures.
A fairly large upper trough will begin to form over the northeast Pacific Ocean late Tuesday. An initial shortwave and surface low will begin to rotate out of the trough and begin moving north over the Oregon coastline Tuesday night. This will cause E-SE crest level flow, with clouds and rain and snow beginning to move north over the Olympics and Cascades Tuesday afternoon and night.
Weather Forecast
Olympics
| Monday Afternoon |
Increasing light to occasional moderate showers. Slight chance of a thunderstorm. Moderate alpine winds. |
| Monday Night |
Light showers decreasing and ending. |
| Tuesday Morning |
Mostly sunny. |
| Tuesday Afternoon |
Increasing high clouds. |
| Tuesday Night |
Increasing light rain or snow. |
Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Monday Afternoon |
Increasing light to occasional moderate showers. Slight chance of a thunderstorm. Moderate alpine winds. |
| Monday Night |
Light showers decreasing and ending. |
| Tuesday Morning |
Mostly sunny north to central. Increasing high clouds south. |
| Tuesday Afternoon |
Increasing high clouds north to central. Increasing mid and high clouds south. |
| Tuesday Night |
Increasing light rain or snow north to central. Increasing light to moderate snow south. |
East slopes of the Washington Cascades
| Monday Afternoon |
Increasing light showers higher elevations. Moderate alpine winds. |
| Monday Night |
Light showers higher elevations decreasing and ending. |
| Tuesday Morning |
Mostly sunny north and increasing high clouds south. |
| Tuesday Afternoon |
Increasing high clouds north and increasing mid and high clouds south. |
| Tuesday Night |
Increasing light rain or snow. |
Mt. Hood Area
| Monday Afternoon |
Increasing light to occasional moderate showers. Slight chance of a thunderstorm. Moderate alpine winds. |
| Monday Night |
Light showers decreasing and ending. |
| Tuesday Night |
Increasing light to moderate rain or snow. |
| Tuesday Morning - Tuesday Afternoon |
Increasing mid and high clouds. |
Issued: 2:15 PM PDT Monday, April 10, 2017
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 | 3500' | 3000' | 3000' | ' | ' | 3500' | ' | 4000' |
| Monday Night - Tuesday Morning | Snow Level | 2500' | 2000' | 2000' | ' | ' | 2500' | ' | 3000' |
| Tuesday Afternoon | Freezing Level * | 4500' | 4500' | 4500' | ' | ' | 5000' | ' | 5500' |
| Tuesday Night | Snow Level * | 4500' | 4000' | 4000' | ' | ' | 4500' | ' | 5500' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3500' |
| Monday Night - Tuesday Morning |
Snow Level 2500' |
| Tuesday Afternoon |
Freezing Level 4500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 4500' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3000' |
| Monday Night - Tuesday Morning |
Snow Level 2000' |
| Tuesday Afternoon |
Freezing Level 4500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 4000' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3000' |
| Monday Night - Tuesday Morning |
Snow Level 2000' |
| Tuesday Afternoon |
Freezing Level 4500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 4000' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' |
| Monday Night - Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Tuesday Night |
Snow Level ' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' |
| Monday Night - Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Tuesday Night |
Snow Level ' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 3500' |
| Monday Night - Tuesday Morning |
Snow Level 2500' |
| Tuesday Afternoon |
Freezing Level 5000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 4500' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' |
| Monday Night - Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Tuesday Night |
Snow Level ' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 4000' |
| Monday Night - Tuesday Morning |
Snow Level 3000' |
| Tuesday Afternoon |
Freezing Level 5500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 5500' (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
| Tuesday | Tuesday | |
|---|---|---|
| Hurricane Ridge | LT 0.25 | LT 0.25 |
| Mt Baker Ski Area | 0 - 0.50 | LT 0.25 |
| Washington Pass | LT 0.25 | LT 0.25 |
| Stevens Pass | 0.25 - 0.50 | LT 0.25 |
| Snoqualmie Pass | 0.25 - 0.50 | LT 0.25 |
| Mission Ridge | LT 0.25 | LT 0.25 |
| Crystal Mt | LT 0.25 | 0.25 - 0.50 |
| Paradise | 0 - 0.50 | 0 - 0.50 |
| White Pass | LT 0.25 | LT 0.25 |
| Mt Hood Meadows | LT 0.25 | 0 - 0.50 |
| Timberline | LT 0.25 | 0 - 0.50 |
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: 2:15 PM PDT Monday, April 10, 2017
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Afternoon | SW 20 - 30 | SW 25 - 35 | SW 20 - 30 | --- - | SW 20 - 30 |
| Monday Evening | SW 15 - 25 | SW 10 - 20 | WSW 15 - 25 | --- - | WSW 15 - 25 |
| Monday Night | VAR 0 - 10 | VAR 0 - 10 | VAR 0 - 10 | --- - | VAR 0 - 10 |
| Tuesday Morning | E 5 - 15 | E 5 - 15 | E 10 - 20 | --- - | E 10 - 20 |
| Tuesday Afternoon | E 10 - 20 | E 10 - 20 | E 15 - 25 | --- - | E 20 - 30 |
| Tuesday Night | E 15 - 25 | E 15 - 25 | ESE 15 - 25 | --- - | ESE 20 - 30 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon | SW 20 - 30 |
| Monday Evening | SW 15 - 25 |
| Monday Night | VAR 0 - 10 |
| Tuesday Morning | E 5 - 15 |
| Tuesday Afternoon | E 10 - 20 |
| Tuesday Night | E 15 - 25 |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon | SW 25 - 35 |
| Monday Evening | SW 10 - 20 |
| Monday Night | VAR 0 - 10 |
| Tuesday Morning | E 5 - 15 |
| Tuesday Afternoon | E 10 - 20 |
| Tuesday Night | E 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon | SW 20 - 30 |
| Monday Evening | WSW 15 - 25 |
| Monday Night | VAR 0 - 10 |
| Tuesday Morning | E 10 - 20 |
| Tuesday Afternoon | E 15 - 25 |
| Tuesday Night | ESE 15 - 25 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Afternoon | --- - |
| Monday Evening | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon | SW 20 - 30 |
| Monday Evening | WSW 15 - 25 |
| Monday Night | VAR 0 - 10 |
| Tuesday Morning | E 10 - 20 |
| Tuesday Afternoon | E 20 - 30 |
| Tuesday Night | ESE 20 - 30 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Afternoon | SW 20 - 30 |
| Monday Evening | SW 15 - 25 |
| Monday Night | VAR 0 - 10 |
| Tuesday Morning | E 5 - 15 |
| Tuesday Afternoon | E 10 - 20 |
| Tuesday Night | E 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | SW 25 - 35 |
| Monday Evening | SW 10 - 20 |
| Monday Night | VAR 0 - 10 |
| Tuesday Morning | E 5 - 15 |
| Tuesday Afternoon | E 10 - 20 |
| Tuesday Night | E 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | SW 20 - 30 |
| Monday Evening | WSW 15 - 25 |
| Monday Night | VAR 0 - 10 |
| Tuesday Morning | E 10 - 20 |
| Tuesday Afternoon | E 15 - 25 |
| Tuesday Night | ESE 15 - 25 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Evening | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | SW 20 - 30 |
| Monday Evening | WSW 15 - 25 |
| Monday Night | VAR 0 - 10 |
| Tuesday Morning | E 10 - 20 |
| Tuesday Afternoon | E 20 - 30 |
| Tuesday Night | ESE 20 - 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 | |
|---|---|---|---|---|---|
| Monday Afternoon | SW 25 - 35 | SW 20 - 30 | SW 30 - 45 | --- - | SW 35 - 50 |
| Monday Evening | WSW 20 - 30 | WSW 20 - 30 | WSW 25 - 35 | --- - | WSW 30 - 45 |
| Monday Night | W 5 - 15 | W 0 - 10 | W 5 - 15 | --- - | W 15 - 25 |
| Tuesday Morning | ESE 10 - 20 | ESE 5 - 15 | SSE 10 - 20 | --- - | SSE 15 - 25 |
| Tuesday Afternoon | ESE 10 - 20 | ESE 10 - 20 | SSE 15 - 25 | --- - | SSE 25 - 35 |
| Tuesday Night | SE 30 - 45 | SE 30 - 45 | SSE 40 - 60 | --- - | SW 50 - 70 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | SW 25 - 35 |
| Monday Evening | WSW 20 - 30 |
| Monday Night | W 5 - 15 |
| Tuesday Morning | ESE 10 - 20 |
| Tuesday Afternoon | ESE 10 - 20 |
| Tuesday Night | SE 30 - 45 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Afternoon | SW 20 - 30 |
| Monday Evening | WSW 20 - 30 |
| Monday Night | W 0 - 10 |
| Tuesday Morning | ESE 5 - 15 |
| Tuesday Afternoon | ESE 10 - 20 |
| Tuesday Night | SE 30 - 45 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | SW 30 - 45 |
| Monday Evening | WSW 25 - 35 |
| Monday Night | W 5 - 15 |
| Tuesday Morning | SSE 10 - 20 |
| Tuesday Afternoon | SSE 15 - 25 |
| Tuesday Night | SSE 40 - 60 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Evening | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | SW 35 - 50 |
| Monday Evening | WSW 30 - 45 |
| Monday Night | W 15 - 25 |
| Tuesday Morning | SSE 15 - 25 |
| Tuesday Afternoon | SSE 25 - 35 |
| Tuesday Night | SW 50 - 70 |
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: 2:15 PM PDT Monday, April 10, 2017
Extended Weather Synopsis for Tuesday night through Tuesday
The fairly large upper trough will linger over the northeast Pacific Ocean Wednesday to Friday. More upper shortwaves and showers will rotate out of the trough and over the Northwest with specific timing not practical at this time. Showers should generally favor the volcanoes. Snow levels will be pretty low for this time of year.
Extended Weather
Olympics, Washington Cascades, Mt Hood
Periods of mostly light showers except periods of light to moderate showers on the volcanoes.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Wednesday | Snow Level | 4000' - 5500' | 4500' - 5500' | 5000' - 6000' | * |
| Thursday - Friday | Snow Level | 2500' - 4000' | 2500' - 4000' | 2500' - 4000' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday |
Snow Level 4000' - 5500' (Easterly Flow *) |
| Thursday - Friday |
Snow Level 2500' - 4000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday |
Snow Level 4500' - 5500' (Easterly Flow *) |
| Thursday - Friday |
Snow Level 2500' - 4000' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday |
Snow Level 5000' - 6000' (Easterly Flow *) |
| Thursday - Friday |
Snow Level 2500' - 4000' |
* 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 Apr 10, 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.
The NWAC will issue daily mountain weather and avalanche forecasts through Saturday, April 15th. Mountain weather and avalanche forecasts will be issued during the spring transition April 20-22nd and April 27-29th. Weekend outlooks will be issued Thursdays, May 4th, 11th, 18th and 25th.
Special advisories, watches and warnings will be issued throughout the spring for unusual or dangerous avalanche conditions. You can find out what constitutes a special advisory, watch or warning here.