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
A common spring-like weather pattern exists over the eastern north Pacific with several slow-moving low pressure circulations cut-off from the jetstream. A small-scale and weakening upper low is drifting S-SW off the coast of Oregon on Monday afternoon.
Partly to mostly cloudy skies are over the mountains of Washington Monday afternoon, with a very isolated chance of a shower. High overcast skies are also observed north of Stevens Pass.
The weak ridge will linger Monday night through Tuesday bringing continued fair weather with mostly clear skies. High clouds will begin increasing Tuesday afternoon as a frontal feature begins slowly approaching from the northwest through Tuesday night.
Freezing levels are typical for mid-March and show a strong diurnal signal.
Weather Forecast
Olympics
| Monday | Mostly cloudy with sun breaks. |
| Monday Night | Becoming mostly clear. |
| Tuesday | Mostly sunny with increasing high clouds in the afternoon. |
| Tuesday Night | High clouds. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Monday | More sun than clouds south part. Partly to mostly cloudy central part. Mostly cloudy with high clouds in the north part. |
| Monday Night | Becoming mostly clear. |
| Tuesday | Mostly sunny with some high clouds arriving in the north in the afternoon. |
| Tuesday Night | Fair with some high clouds. |
East Slopes of the Washington Cascades
| Monday | More sun than clouds south part. Partly to mostly cloudy central part. Mostly cloudy with high clouds in the north part. |
| Monday Night | Becoming mostly clear. |
| Tuesday | Mostly sunny with some high clouds arriving in the north in the afternoon. |
| Tuesday Night | Fair with some high clouds. |
Mt. Hood
| Monday | More sun than clouds. |
| Monday Night | Becoming mostly clear. |
| Tuesday | Mostly sunny in the morning becoming partly cloudy in the afternoon. |
| Tuesday Night | Mostly clear in the evening, then high clouds increasing. |
Issued: 2:29 PM PDT Monday, March 19, 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 | Freezing Level | 4000' | 4000' | 5000' | ' | ' | 4500' | ' | 5000' |
| Monday Night | Freezing Level | 2500' | 2500' | 2000' | ' | ' | 2000' | ' | 2500' |
| Tuesday Morning | Freezing Level | 4000' | 4000' | 5000' | ' | ' | 4500' | ' | 5000' |
| Tuesday Afternoon | Freezing Level | 4000' | 4500' | 5500' | ' | ' | 5000' | ' | 6000' |
| Tuesday Night | Freezing Level * | 3000' | 2500' | 3000' | ' | ' | 2500' | ' | 3000' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level 4000' |
| Monday Night |
Freezing Level 2500' |
| Tuesday Morning |
Freezing Level 4000' |
| Tuesday Afternoon |
Freezing Level 4000' |
| Tuesday Night |
Freezing Level 3000' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level 4000' |
| Monday Night |
Freezing Level 2500' |
| Tuesday Morning |
Freezing Level 4000' |
| Tuesday Afternoon |
Freezing Level 4500' |
| Tuesday Night |
Freezing Level 2500' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level 5000' |
| Monday Night |
Freezing Level 2000' |
| Tuesday Morning |
Freezing Level 5000' |
| Tuesday Afternoon |
Freezing Level 5500' |
| Tuesday Night |
Freezing Level 3000' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level ' |
| Monday Night |
Freezing Level ' |
| Tuesday Morning |
Freezing Level ' |
| Tuesday Afternoon |
Freezing Level ' |
| Tuesday Night |
Freezing Level ' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level ' |
| Monday Night |
Freezing Level ' |
| Tuesday Morning |
Freezing Level ' |
| Tuesday Afternoon |
Freezing Level ' |
| Tuesday Night |
Freezing Level ' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level 4500' |
| Monday Night |
Freezing Level 2000' |
| Tuesday Morning |
Freezing Level 4500' |
| Tuesday Afternoon |
Freezing Level 5000' |
| Tuesday Night |
Freezing Level 2500' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level ' |
| Monday Night |
Freezing Level ' |
| Tuesday Morning |
Freezing Level ' |
| Tuesday Afternoon |
Freezing Level ' |
| Tuesday Night |
Freezing Level ' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level 5000' |
| Monday Night |
Freezing Level 2500' |
| Tuesday Morning |
Freezing Level 5000' |
| Tuesday Afternoon |
Freezing Level 6000' |
| Tuesday Night |
Freezing Level 3000' (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
| Monday | Monday | |
|---|---|---|
| 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: 2:29 PM PDT Monday, March 19, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Afternoon | W 5 - 15 | WSW 5 - 15 | W 5 - 15 | --- - | WNW 5 - 15 |
| Monday Night | WSW 5 - 15 | WSW 5 - 15 | W 5 - 15 | --- - | W 0 - 10 |
| Tuesday Morning | SW 5 - 15 | SSW 5 - 15 | WSW 5 - 15 | --- - | WSW 5 - 15 |
| Tuesday Afternoon | WSW 5 - 15 | WSW 5 - 15 | W 5 - 15 | --- - | W 5 - 15 |
| Tuesday Night | SSW 5 - 15 | S 5 - 15 | SSW 5 - 15 | --- - | SW 0 - 10 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon | W 5 - 15 |
| Monday Night | WSW 5 - 15 |
| Tuesday Morning | SW 5 - 15 |
| Tuesday Afternoon | WSW 5 - 15 |
| Tuesday Night | SSW 5 - 15 |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon | WSW 5 - 15 |
| Monday Night | WSW 5 - 15 |
| Tuesday Morning | SSW 5 - 15 |
| Tuesday Afternoon | WSW 5 - 15 |
| Tuesday Night | S 5 - 15 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon | W 5 - 15 |
| Monday Night | W 5 - 15 |
| Tuesday Morning | WSW 5 - 15 |
| Tuesday Afternoon | W 5 - 15 |
| Tuesday Night | SSW 5 - 15 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon | WNW 5 - 15 |
| Monday Night | W 0 - 10 |
| Tuesday Morning | WSW 5 - 15 |
| Tuesday Afternoon | W 5 - 15 |
| Tuesday Night | SW 0 - 10 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Afternoon | W 5 - 15 |
| Monday Night | WSW 5 - 15 |
| Tuesday Morning | SW 5 - 15 |
| Tuesday Afternoon | WSW 5 - 15 |
| Tuesday Night | SSW 5 - 15 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | WSW 5 - 15 |
| Monday Night | WSW 5 - 15 |
| Tuesday Morning | SSW 5 - 15 |
| Tuesday Afternoon | WSW 5 - 15 |
| Tuesday Night | S 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | W 5 - 15 |
| Monday Night | W 5 - 15 |
| Tuesday Morning | WSW 5 - 15 |
| Tuesday Afternoon | W 5 - 15 |
| Tuesday Night | SSW 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | WNW 5 - 15 |
| Monday Night | W 0 - 10 |
| Tuesday Morning | WSW 5 - 15 |
| Tuesday Afternoon | W 5 - 15 |
| Tuesday Night | SW 0 - 10 |
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 5 - 15 | W 5 - 15 | W 5 - 15 | --- - | W 5 - 15 |
| Monday Night | W 10 - 20 | WSW 10 - 20 | W 10 - 20 | --- - | WSW 10 - 20 |
| Tuesday Morning | W 10 - 20 | WSW 10 - 20 | W 10 - 20 | --- - | WSW 5 - 15 |
| Tuesday Afternoon | WSW 10 - 20 | WSW 10 - 20 | WSW 10 - 20 | --- - | WSW 5 - 15 |
| Tuesday Night | SW 10 - 20 | SW 10 - 20 | SW 10 - 20 | --- - | SW 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | W 5 - 15 |
| Monday Night | W 10 - 20 |
| Tuesday Morning | W 10 - 20 |
| Tuesday Afternoon | WSW 10 - 20 |
| Tuesday Night | SW 10 - 20 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Afternoon | W 5 - 15 |
| Monday Night | WSW 10 - 20 |
| Tuesday Morning | WSW 10 - 20 |
| Tuesday Afternoon | WSW 10 - 20 |
| Tuesday Night | SW 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | W 5 - 15 |
| Monday Night | W 10 - 20 |
| Tuesday Morning | W 10 - 20 |
| Tuesday Afternoon | WSW 10 - 20 |
| Tuesday Night | SW 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | W 5 - 15 |
| Monday Night | WSW 10 - 20 |
| Tuesday Morning | WSW 5 - 15 |
| Tuesday Afternoon | WSW 5 - 15 |
| Tuesday Night | SW 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.
Issued: 2:29 PM PDT Monday, March 19, 2018
Extended Weather Synopsis for Monday night through Monday
A trough hugging the Alaska pan-handle will drop south on Wednesday with a leading cold front rotating counter-clockwise around Vancouver Island. The front will tap into moisture from another low spinning well off the California Coast. This will bring some light moisture into the Hood and South Cascades regions, likely beginning to arrive during the late morning hours and spreading throughout the forecast region and increasing as the cold front approaches our near-shore waters Wednesday night.
The north-south oriented cold front should arrive mid-day Thursday, bringing some light to moderate rain and snow. Shower activity will continue later Thursday into Thursday night, when some upper level enhancement may increase winds and shower activity late Thursday night into 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 | 3500' - 4500' | 3500' - 4500' | 4000' - 5000' | |
| Wednesday Night | Snow Level | 3500' - 4500' | 3500' - 4500' | 4500' - 5500' | |
| Thursday | Snow Level | 1500' - 3000' | 2000' - 3000' | 2000' - 3000' | |
| Thursday Night | Snow Level | 1000' - 2000' | 1000' - 2000' | 1000' - 2000' | |
| Friday | Snow Level | 1000' - 2000' | 1000' - 2000' | 1000' - 2000' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday |
Snow Level 3500' - 4500' |
| Wednesday Night |
Snow Level 3500' - 4500' |
| Thursday |
Snow Level 1500' - 3000' |
| Thursday Night |
Snow Level 1000' - 2000' |
| Friday |
Snow Level 1000' - 2000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday |
Snow Level 3500' - 4500' |
| Wednesday Night |
Snow Level 3500' - 4500' |
| Thursday |
Snow Level 2000' - 3000' |
| Thursday Night |
Snow Level 1000' - 2000' |
| Friday |
Snow Level 1000' - 2000' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday |
Snow Level 4000' - 5000' |
| Wednesday Night |
Snow Level 4500' - 5500' |
| Thursday |
Snow Level 2000' - 3000' |
| Thursday Night |
Snow Level 1000' - 2000' |
| Friday |
Snow Level 1000' - 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.
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 19, 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.