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 & Friday
A northward-lifting frontal zone connecting weak weather systems lifted north overnight and into the early morning hours, leaving the Pacific Northwest with a relatively nice day under high clouds and filtered sunlight gradually giving way to thickening clouds. To the west, an elongated trough is gradually approaching our coastal waters.
Tonight, the trough splits. The northern branch comprises a shortwave trough and a weakening frontal zone. The trough should arrive over the Pacific Northwest late monday night. Most of the energy from the elongated trough takes a southerly track, spawning a cutoff low which should move into the California coastal waters.
On Tuesday, light to moderate onshore flow should continue shower activity on a westerly flow, particularly west of the Cascade crest with convergence bands developing and focused from Snoqualmie to Stevens Pass. Onshore flow and shower activity continue Tuesday night.
Weather Forecast
Olympics
| Monday | Occasional light rain and snow. |
| Monday Night | Increasing light rain and snow. |
| Tuesday | Increasing light showers. |
| Tuesday Night | Decreasing light showers. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Monday | Mostly cloudy. Occasional very light showers. |
| Monday Night | Increasing light rain or snow mainly after midnight. |
| Tuesday | Light rain or snow showers, generally decreasing in intensity, but heaviest in convergence in the Stevens to Snoqualmie area in the late afternoon. |
| Tuesday Night | Light rain or snow showers, with occasionally moderate showers in convergence from Stevens to Snoqualmie. |
East Slopes of the Washington Cascades
| Monday | Mostly cloudy cloudy. Occasional very light showers. |
| Monday Night | Increasing light rain and freezing rain at lower elevations with snow at higher elevations. |
| Tuesday | Decreasing light rain and snow showers, particularly higher elevations. |
| Tuesday Night | Light showers, mainly at high elevations and in the central part from convergence spillover. |
Mt. Hood
| Monday | Mostly cloudy cloudy. Occasional very light showers. |
| Monday Night | Increasing light rain and snow. |
| Tuesday | Light rain and snow showers. |
| Tuesday Night | Light and occasionally moderate rain and snow showers. |
Issued: 5:49 PM PST Monday, January 8, 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' | 4000' | 4000' | ' | ' | 4500' | ' | 6500' |
| Monday Night | Snow Level * | 3500' | 3500' | 3000' | ' | ' | 4000' | ' | 6000' |
| Tuesday Morning | Snow Level | 3000' | 3000' | 3500' | ' | ' | 3000' | ' | 4500' |
| Tuesday Afternoon | Snow Level | 2500' | 2500' | 2500' | ' | ' | 2500' | ' | 3000' |
| Tuesday Night | Snow Level | 2000' | 1500' | 1500' | ' | ' | 1500' | ' | 2000' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 4000' (Easterly Flow *) |
| Monday Night |
Snow Level 3500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 3000' |
| Tuesday Afternoon |
Snow Level 2500' |
| Tuesday Night |
Snow Level 2000' |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 4000' (Easterly Flow *) |
| Monday Night |
Snow Level 3500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 3000' |
| Tuesday Afternoon |
Snow Level 2500' |
| Tuesday Night |
Snow Level 1500' |
| Washington Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 4000' (Easterly Flow *) |
| Monday Night |
Snow Level 3000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 3500' |
| Tuesday Afternoon |
Snow Level 2500' |
| Tuesday Night |
Snow Level 1500' |
| Leavenworth | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' (Easterly Flow *) |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' (Easterly Flow *) |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 4500' (Easterly Flow *) |
| Monday Night |
Snow Level 4000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 3000' |
| Tuesday Afternoon |
Snow Level 2500' |
| Tuesday Night |
Snow Level 1500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Afternoon |
Snow Level ' (Easterly Flow *) |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon |
Snow Level 6500' (Easterly Flow *) |
| Monday Night |
Snow Level 6000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 4500' |
| Tuesday Afternoon |
Snow Level 3000' |
| Tuesday Night |
Snow Level 2000' |
* 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
| Friday | Friday | |
|---|---|---|
| Hurricane Ridge | LT 0.25 | LT 0.10 |
| Mt Baker Ski Area | 0 - 0.50 | LT 0.25 |
| Washington Pass | LT 0.25 | LT 0.25 |
| Stevens Pass | LT 0.25 | 0 - 0.50 |
| Snoqualmie Pass | LT 0.25 | 0.50 - 0.75 |
| Mission Ridge | LT 0.25 | LT 0.10 |
| Crystal Mt | LT 0.25 | LT 0.25 |
| Paradise | 0 - 0.50 | LT 0.25 |
| White Pass | LT 0.25 | LT 0.25 |
| Mt Hood Meadows | LT 0.25 | LT 0.25 |
| Timberline | LT 0.25 | 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: 5:49 PM PST Monday, January 8, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Afternoon | SSE 15 - 25 | SSE 15 - 25 | SSE 10 - 20 | --- - | SSE 10 - 20 |
| Monday Night | SSE 15 - 25 | SSW 15 - 25 | SSE 15 - 25 | --- - | SSE 10 - 20 |
| Tuesday Morning | WSW 15 - 25 | SW 10 - 20 | WSW 10 - 20 | --- - | WSW 10 - 20 |
| Tuesday Afternoon | WSW 20 - 30 | SW 15 - 25 | WSW 20 - 30 | --- - | WSW 20 - 30 |
| Tuesday Night | WSW 15 - 25 | WSW 15 - 25 | WSW 15 - 25 | --- - | WSW 20 - 30 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon | SSE 15 - 25 |
| Monday Night | SSE 15 - 25 |
| Tuesday Morning | WSW 15 - 25 |
| Tuesday Afternoon | WSW 20 - 30 |
| Tuesday Night | WSW 15 - 25 |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon | SSE 15 - 25 |
| Monday Night | SSW 15 - 25 |
| Tuesday Morning | SW 10 - 20 |
| Tuesday Afternoon | SW 15 - 25 |
| Tuesday Night | WSW 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon | SSE 10 - 20 |
| Monday Night | SSE 15 - 25 |
| Tuesday Morning | WSW 10 - 20 |
| Tuesday Afternoon | WSW 20 - 30 |
| Tuesday Night | WSW 15 - 25 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon | SSE 10 - 20 |
| Monday Night | SSE 10 - 20 |
| Tuesday Morning | WSW 10 - 20 |
| Tuesday Afternoon | WSW 20 - 30 |
| Tuesday Night | WSW 20 - 30 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Afternoon | SSE 15 - 25 |
| Monday Night | SSE 15 - 25 |
| Tuesday Morning | WSW 15 - 25 |
| Tuesday Afternoon | WSW 20 - 30 |
| Tuesday Night | WSW 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | SSE 15 - 25 |
| Monday Night | SSW 15 - 25 |
| Tuesday Morning | SW 10 - 20 |
| Tuesday Afternoon | SW 15 - 25 |
| Tuesday Night | WSW 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | SSE 10 - 20 |
| Monday Night | SSE 15 - 25 |
| Tuesday Morning | WSW 10 - 20 |
| Tuesday Afternoon | WSW 20 - 30 |
| Tuesday Night | WSW 15 - 25 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | SSE 10 - 20 |
| Monday Night | SSE 10 - 20 |
| Tuesday Morning | WSW 10 - 20 |
| Tuesday Afternoon | WSW 20 - 30 |
| Tuesday Night | WSW 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 | SSW 20 - 30 | SSW 15 - 25 | SSW 30 - 40 | --- - | SSW 25 - 35 |
| Monday Night | SSW 35 - 45 | SW 20 - 30 | SW 25 - 35 | --- - | SW 30 - 40 |
| Tuesday Morning | SW 20 - 30 | SW 25 - 35 | SW 30 - 40 | --- - | SW 30 - 40 |
| Tuesday Afternoon | W 20 - 30 | W 20 - 30 | W 30 - 40 | --- - | W 40 - 60 |
| Tuesday Night | W 20 - 30 | W 25 - 35 | W 30 - 40 | --- - | W 40 - 60 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | SSW 20 - 30 |
| Monday Night | SSW 35 - 45 |
| Tuesday Morning | SW 20 - 30 |
| Tuesday Afternoon | W 20 - 30 |
| Tuesday Night | W 20 - 30 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Afternoon | SSW 15 - 25 |
| Monday Night | SW 20 - 30 |
| Tuesday Morning | SW 25 - 35 |
| Tuesday Afternoon | W 20 - 30 |
| Tuesday Night | W 25 - 35 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | SSW 30 - 40 |
| Monday Night | SW 25 - 35 |
| Tuesday Morning | SW 30 - 40 |
| Tuesday Afternoon | W 30 - 40 |
| Tuesday Night | W 30 - 40 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | SSW 25 - 35 |
| Monday Night | SW 30 - 40 |
| Tuesday Morning | SW 30 - 40 |
| Tuesday Afternoon | W 40 - 60 |
| Tuesday Night | W 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: 5:49 PM PST Monday, January 8, 2018
Extended Weather Synopsis for Friday night through Friday
On Wednesday, cool, moist WNW flow continues through the day with an increase in precipitation late Wednesday as warm frontal features begin arriving ahead of a stronger storm slated to arrive on Thursday.
On Thursday, a developing storm arrives from the west with a strong warm front crossing the forecast area in the early morning hours on Thursday. Very stormy weather with elevated freezing levels should be seen until the cold frontal passage mid-day. Moderate to strong WSW should continue after the storm passes with a drying trend as another large ridge of high pressure begins building into the Pacific Northwest on Friday.
Extended Weather
Olympics, Washington Cascades and Mt. Hood Area
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Wednesday | Snow Level | 1000' - 2000' | 1000' - 2500' | 2000' - 4000' | * |
| Wednesday Night | Snow Level | 3000' - 4000' | 3000' - 4000' | 4500' - 5500' | |
| Thursday | Snow Level | 3000' - 4000' | 3000' - 4000' | 4500' - 5500' | * |
| Thursday Night | Snow Level | 3000' - 4000' | 4500' - 5500' | 5500' - 6500' | |
| Friday | Snow Level | 2500' - 3500' | 3000' - 4000' | 3500' - 4500' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday |
Snow Level 1000' - 2000' (Easterly Flow *) |
| Wednesday Night |
Snow Level 3000' - 4000' |
| Thursday |
Snow Level 3000' - 4000' (Easterly Flow *) |
| Thursday Night |
Snow Level 3000' - 4000' |
| Friday |
Snow Level 2500' - 3500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday |
Snow Level 1000' - 2500' (Easterly Flow *) |
| Wednesday Night |
Snow Level 3000' - 4000' |
| Thursday |
Snow Level 3000' - 4000' (Easterly Flow *) |
| Thursday Night |
Snow Level 4500' - 5500' |
| Friday |
Snow Level 3000' - 4000' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday |
Snow Level 2000' - 4000' (Easterly Flow *) |
| Wednesday Night |
Snow Level 4500' - 5500' |
| Thursday |
Snow Level 4500' - 5500' (Easterly Flow *) |
| Thursday Night |
Snow Level 5500' - 6500' |
| 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 Jan 8, 2018
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.