Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Sunday & Thursday
As a reminder, NWAC weather station data is in PST year round.
As of 2 PM, we have mostly sunny skies with widespread mountain temperatures in the 40s with generally a light E or SE breeze. We are in a high amplitude pattern aloft, with broad upper level ridging over the Intermountain West and a large low complex offshore around 140W.
After a clear night, the ridge axis will shift inland on Monday as a weak N-S oriented front approaches 130W. We will enjoy another warm and sunny day, but offshore flow gradients will increase during the day with breezy E-SE winds developing especially in the Passes and at crest level from Snoquamlie Pass and south to Mt. Hood. Freezing levels should be coolest in the NE Cascades and Stevens Pass area, only topping out around 7000 feet, with freezing levels 8000-9000 feet elsewhere.
The weak frontal system will approach the coast Monday night, with light precipitation rotating up from the south and perhaps reaching Mt. Hood before daybreak early Tuesday morning. E-SE winds will increase further Monday night.
Weather Forecast
Olympics
| Sunday | Mostly sunny and warm. |
| Sunday Night | Mostly clear. |
| Monday | Mostly sunny and warm with some high clouds in the afternoon. |
| Monday Night | Becoming partly to mostly cloudy overnight. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Sunday | Mostly sunny and warm. |
| Sunday Night | Mostly clear. |
| Monday | Mostly sunny and warm. Breezy E-SE winds Passes and Cascade crest level from Snoqualmie Pass and south. |
| Monday Night | Becoming partly to mostly cloudy overnight. Moderate E-SE winds Passes and Cascade crest level from Snoqualmie Pass and south. |
East Slopes of the Washington Cascades
| Sunday | Mostly sunny and warm. |
| Sunday Night | Mostly clear. |
| Monday | Mostly sunny and warm. Breezy E-SE winds Cascade crest level from Snoqualmie Pass and south. |
| Monday Night | Becoming partly cloudy overnight. Moderate E-SE winds Cascade crest level from Snoqualmie Pass and south. |
Mt. Hood
| Sunday | Mostly sunny and warm. |
| Sunday Night | Mostly clear. |
| Monday | Mostly sunny and warm. Breezy E-SE winds. |
| Monday Night | Becoming mostly cloudy overnight with a chance of light rain after midnight. Moderate S-SE winds. |
Issued: 2:20 PM PDT Sunday, March 11, 2018
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Sunday Afternoon | Freezing Level * | 7000' | 7000' | 6500' | ' | ' | 7000' | ' | 8000' |
| Sunday Night | Freezing Level * | 8000' | 7000' | 3000' | ' | ' | 6000' | ' | 8000' |
| Monday Morning | Freezing Level * | 8000' | 7000' | 3000' | ' | ' | 6000' | ' | 8000' |
| Monday Afternoon | Freezing Level * | 9000' | 8500' | 7000' | ' | ' | 8500' | ' | 9000' |
| Monday Night | Freezing Level * | 9000' | 8000' | 5000' | ' | ' | 7500' | ' | 9000' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Afternoon |
Freezing Level 7000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 8000' (Easterly Flow *) |
| Monday Morning |
Freezing Level 8000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 9000' (Easterly Flow *) |
| Monday Night |
Freezing Level 9000' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Sunday Afternoon |
Freezing Level 7000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 7000' (Easterly Flow *) |
| Monday Morning |
Freezing Level 7000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 8500' (Easterly Flow *) |
| Monday Night |
Freezing Level 8000' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Sunday Afternoon |
Freezing Level 6500' (Easterly Flow *) |
| Sunday Night |
Freezing Level 3000' (Easterly Flow *) |
| Monday Morning |
Freezing Level 3000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 7000' (Easterly Flow *) |
| Monday Night |
Freezing Level 5000' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Sunday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Sunday Night |
Freezing Level ' (Easterly Flow *) |
| Monday Morning |
Freezing Level ' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Monday Night |
Freezing Level ' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Sunday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Sunday Night |
Freezing Level ' (Easterly Flow *) |
| Monday Morning |
Freezing Level ' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Monday Night |
Freezing Level ' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Afternoon |
Freezing Level 7000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 6000' (Easterly Flow *) |
| Monday Morning |
Freezing Level 6000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 8500' (Easterly Flow *) |
| Monday Night |
Freezing Level 7500' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Sunday Night |
Freezing Level ' (Easterly Flow *) |
| Monday Morning |
Freezing Level ' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Monday Night |
Freezing Level ' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Sunday Afternoon |
Freezing Level 8000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 8000' (Easterly Flow *) |
| Monday Morning |
Freezing Level 8000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 9000' (Easterly Flow *) |
| Monday Night |
Freezing Level 9000' (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
| Thursday | Thursday | |
|---|---|---|
| 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 0.10 | 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 0.10 |
| 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: 2:20 PM PDT Sunday, March 11, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Afternoon | SE 0 - 10 | SE 5 - 15 | ESE 5 - 15 | --- - | E 5 - 15 |
| Sunday Night | SE 5 - 15 | ESE 5 - 15 | ESE 10 - 20 | --- - | ESE 10 - 20 |
| Monday | SE 10 - 20 | SE 10 - 20 | ESE 15 - 25 | --- - | ESE 15 - 25 |
| Monday Night | SE 15 - 25 | E 15 - 25 | ESE 20 - 35 | --- - | ESE 20 - 30 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Afternoon | SE 0 - 10 |
| Sunday Night | SE 5 - 15 |
| Monday | SE 10 - 20 |
| Monday Night | SE 15 - 25 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Afternoon | SE 5 - 15 |
| Sunday Night | ESE 5 - 15 |
| Monday | SE 10 - 20 |
| Monday Night | E 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Afternoon | ESE 5 - 15 |
| Sunday Night | ESE 10 - 20 |
| Monday | ESE 15 - 25 |
| Monday Night | ESE 20 - 35 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday | --- - |
| Monday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Sunday Afternoon | E 5 - 15 |
| Sunday Night | ESE 10 - 20 |
| Monday | ESE 15 - 25 |
| Monday Night | ESE 20 - 30 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Afternoon | SE 0 - 10 |
| Sunday Night | SE 5 - 15 |
| Monday | SE 10 - 20 |
| Monday Night | SE 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Afternoon | SE 5 - 15 |
| Sunday Night | ESE 5 - 15 |
| Monday | SE 10 - 20 |
| Monday Night | E 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | ESE 5 - 15 |
| Sunday Night | ESE 10 - 20 |
| Monday | ESE 15 - 25 |
| Monday Night | ESE 20 - 35 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday | --- - |
| Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Afternoon | E 5 - 15 |
| Sunday Night | ESE 10 - 20 |
| Monday | ESE 15 - 25 |
| Monday 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 | |
|---|---|---|---|---|---|
| Sunday Afternoon | S 5 - 15 | S 5 - 15 | S 5 - 15 | --- - | S 10 - 20 |
| Sunday Night | S 10 - 20 | S 5 - 15 | SSE 10 - 20 | --- - | SSE 10 - 20 |
| Monday Morning | SSE 10 - 20 | S 10 - 20 | SSE 10 - 20 | --- - | SSE 15 - 25 |
| Monday Afternoon | SE 10 - 20 | SSE 15 - 25 | SE 20 - 30 | --- - | SE 20 - 30 |
| Monday Night | S 20 - 30 | SSE 25 - 35 | SSE 35 - 45 | --- - | S 45 - 55 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Afternoon | S 5 - 15 |
| Sunday Night | S 10 - 20 |
| Monday Morning | SSE 10 - 20 |
| Monday Afternoon | SE 10 - 20 |
| Monday Night | S 20 - 30 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | S 5 - 15 |
| Sunday Night | S 5 - 15 |
| Monday Morning | S 10 - 20 |
| Monday Afternoon | SSE 15 - 25 |
| Monday Night | SSE 25 - 35 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | S 5 - 15 |
| Sunday Night | SSE 10 - 20 |
| Monday Morning | SSE 10 - 20 |
| Monday Afternoon | SE 20 - 30 |
| Monday Night | SSE 35 - 45 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Afternoon | S 10 - 20 |
| Sunday Night | SSE 10 - 20 |
| Monday Morning | SSE 15 - 25 |
| Monday Afternoon | SE 20 - 30 |
| Monday Night | S 45 - 55 |
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: 2:20 PM PDT Sunday, March 11, 2018
Extended Weather Synopsis for Thursday night through Thursday
The N-S oriented frontal band will slowly traverse across the Puget Sound on Tuesday and S-SE winds, especially in the Passes and in the alpine should remain elevated through the morning hours. Due to the slow frontal progression, light precipitation will take awhile to develop over the east slopes of the Cascades Tuesday.
The frontal boundary will finally lift to the NE Tuesday night as a trailing shortwave trough moves through. With a cooler air mass overhead Wednesday, showers should be driven by daytime heating in the afternoon.
The low complex will dig south off the California coast over the extended period. A shortwave trough extending from the upper low should rotate up from the south Wednesday night, enhancing shower activity over the region on Thursday.
Extended Weather
Olympics, Washington Cascades and Mt. Hood Area
Tuesday Light rain and snow for the Olympics, West Slopes of the Cascades and Mt. Hood. Light rain and snow developing in the afternoon for East Slopes of the Cascades. Windy through mid-day Passes and alpine. Wednesday Mostly cloudy with scattered light rain and snow showers. Thursday Mostly cloudy with light to occasionally moderate rain and snow showers. Tuesday Night Mostly cloudy with light rain and snow showers. Cooling trend. Wednesday Night Partly cloudy north and central Washington Cascades, mostly cloudy with light rain and snow showers south Washington Cascades and Mt. Hood.Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Tuesday | Snow Level | 5000' - 6000' | 4500' - 5500' | 4500' - 5500' | |
| Tuesday Night | Snow Level | 3000' - 4000' | 3000' - 4000' | 3000' - 4000' | |
| Wednesday | Snow Level | 2500' - 3500' | 2500' - 3500' | 3000' - 4000' | |
| Wednesday Night | Snow Level | 3000' - 4000' | 3000' - 4000' | 3000' - 4000' | |
| Thursday | Snow Level | 3500' - 4500' | 3500' - 4500' | 3500' - 4500' |
| Mt. Baker | Elevation |
|---|---|
| Tuesday |
Snow Level 5000' - 6000' |
| Tuesday Night |
Snow Level 3000' - 4000' |
| Wednesday |
Snow Level 2500' - 3500' |
| Wednesday Night |
Snow Level 3000' - 4000' |
| Thursday |
Snow Level 3500' - 4500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday |
Snow Level 4500' - 5500' |
| Tuesday Night |
Snow Level 3000' - 4000' |
| Wednesday |
Snow Level 2500' - 3500' |
| Wednesday Night |
Snow Level 3000' - 4000' |
| Thursday |
Snow Level 3500' - 4500' |
| Mt. Hood | Elevation |
|---|---|
| Tuesday |
Snow Level 4500' - 5500' |
| Tuesday Night |
Snow Level 3000' - 4000' |
| Wednesday |
Snow Level 3000' - 4000' |
| Wednesday Night |
Snow Level 3000' - 4000' |
| Thursday |
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 Mar 11, 2018
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