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
An upper level ridge offshore will slide east of the Cascades this afternoon, quickly transitioning the area from our wet weekend to dry and warm weather on Monday. This will be a dirty ridge, with a fair amount of high clouds slipping underneath and creating some filtered sunshine. Freezing levels will soar to 7000 feet in the north and 10,000 feet in the south over Mt. Hood this afternoon. Enjoy today because the weather pattern turns and stays active through next weekend. A deep upper level low in the NE Pacific will send a number of Pacific frontal systems our way over the next few days.
Tonight, the air mass will begin fairly dry and clouds should slowly lower overnight with light rain and snow developing during the morning hours on Tuesday. A rapidly developing low pressure system forming along the existing frontal boundary will curl toward Vancouver Island on Tuesday. This will bring a round of locally stronger southerly winds to the Olympics and northwest Cascades through at least early afternoon. Showers should generally become light and scattered in the afternoon as a cooling trend ensues. Locally heavier showers should be seen in the Mt. Baker area in this pattern.
Scattered showers will continue Tuesday night as another Pacific frontal system approaches the area.
Weather Forecast
Olympics
| Monday | High overcast with filtered sunshine. Mild. |
| Monday Night | Increasing clouds. Slight chance of rain and snow late tonight. Mild. |
| Tuesday | Light to occasionally moderate rain and snow becoming mostly cloudy with scattered light rain and snow showers in the afternoon. Cooling trend. Very windy. |
| Tuesday Night | Mostly cloudy with light rain and snow showers. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Monday | Partly sunny with filtered sunshine and high clouds north Cascades. Mostly sunny with periods of high clouds south Cascades. Warm. |
| Monday Night | Increasing clouds. Slight chance of rain and snow late tonight. Mild. |
| Tuesday | Light to occasionally moderate rain and snow becoming mostly cloudy with scattered light rain and snow showers in the afternoon. Showers occasionally moderate Mt. Baker area. Windy Mt. Baker area. Cooling trend. |
| Tuesday Night | Mostly cloudy with scattered light rain and snow showers except occasionally moderate Mt. Baker area. |
East Slopes of the Washington Cascades
| Monday | Partly sunny with filtered sunshine and high clouds north Cascades. Mostly sunny with periods of high clouds south Cascades. Warm. |
| Monday Night | Increasing clouds. Slight chance of rain and snow late tonight. Mild. |
| Tuesday | Light rain and snow becoming partly to mostly cloudy with scattered light rain and snow showers in the afternoon. Cooling trend. |
| Tuesday Night | Partly to mostly cloudy with isolated light rain and snow showers. |
Mt. Hood
| Monday | Mostly sunny with periods of high clouds. Warm. |
| Monday Night | Increasing clouds. Slight chance of rain and snow late tonight. Mild. |
| Tuesday | Light rain and snow becoming mostly cloudy with scattered light rain and snow showers in the afternoon. Cooling trend. |
| Tuesday Night | Partly to mostly cloudy with isolated light rain and snow showers. |
Issued: 2:57 PM PDT Monday, April 9, 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 | 9000' | 7000' | 7000' | ' | ' | 8000' | ' | 10000' |
| Monday Night | Freezing Level | 9500' | 8000' | 7500' | ' | ' | 9500' | ' | 10500' |
| Tuesday Morning | Snow Level | 5500' | 6000' | 6000' | ' | ' | 6000' | ' | 7000' |
| Tuesday Afternoon | Snow Level | 4500' | 4500' | 5000' | ' | ' | 4500' | ' | 5500' |
| Tuesday Night | Snow Level | 4000' | 3500' | 3500' | ' | ' | 3500' | ' | 4000' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level 9000' |
| Monday Night |
Freezing Level 9500' |
| Tuesday Morning |
Snow Level 5500' |
| Tuesday Afternoon |
Snow Level 4500' |
| Tuesday Night |
Snow Level 4000' |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level 7000' |
| Monday Night |
Freezing Level 8000' |
| Tuesday Morning |
Snow Level 6000' |
| Tuesday Afternoon |
Snow Level 4500' |
| Tuesday Night |
Snow Level 3500' |
| Washington Pass | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level 7000' |
| Monday Night |
Freezing Level 7500' |
| Tuesday Morning |
Snow Level 6000' |
| Tuesday Afternoon |
Snow Level 5000' |
| Tuesday Night |
Snow Level 3500' |
| Leavenworth | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level ' |
| Monday Night |
Freezing Level ' |
| Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level ' |
| Monday Night |
Freezing Level ' |
| Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level 8000' |
| Monday Night |
Freezing Level 9500' |
| Tuesday Morning |
Snow Level 6000' |
| Tuesday Afternoon |
Snow Level 4500' |
| Tuesday Night |
Snow Level 3500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level ' |
| Monday Night |
Freezing Level ' |
| Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon |
Freezing Level 10000' |
| Monday Night |
Freezing Level 10500' |
| Tuesday Morning |
Snow Level 7000' |
| Tuesday Afternoon |
Snow Level 5500' |
| Tuesday Night |
Snow Level 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.
Precipitation Forecast
| Monday | Monday | |
|---|---|---|
| Hurricane Ridge | LT 0.10 | 0 - 0.50 |
| Mt Baker Ski Area | LT 0.10 | 1.00 - 1.50 |
| Washington Pass | LT 0.10 | LT 0.25 |
| Stevens Pass | LT 0.10 | 0 - 0.50 |
| Snoqualmie Pass | LT 0.10 | 0 - 0.50 |
| Mission Ridge | LT 0.10 | LT 0.10 |
| Crystal Mt | LT 0.10 | LT 0.25 |
| Paradise | LT 0.10 | 0.50 - 0.75 |
| White Pass | LT 0.10 | LT 0.25 |
| Mt Hood Meadows | LT 0.10 | LT 0.25 |
| Timberline | LT 0.10 | 0.25 - 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: 2:57 PM PDT Monday, April 9, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Afternoon | SE 5 - 15 | SE 0 - 10 | SE 0 - 10 | --- - | SE 5 - 15 |
| Monday Night | SSE 15 - 25 | SE 10 - 20 | SE 15 - 25 | --- - | SE 10 - 20 |
| Tuesday Morning | S 35 - 50 | SSE 30 - 50 | SE 15 - 25 | --- - | SW 15 - 30 |
| Tuesday Afternoon | SSW 25 - 35 | SSW 20 - 35 | SW 15 - 25 | --- - | SW 15 - 25 |
| Tuesday Night | S 15 - 30 | SSE 15 - 25 | S 10 - 20 | --- - | SW 20 - 30 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Afternoon | SE 5 - 15 |
| Monday Night | SSE 15 - 25 |
| Tuesday Morning | S 35 - 50 |
| Tuesday Afternoon | SSW 25 - 35 |
| Tuesday Night | S 15 - 30 |
| Mt. Baker | Elevation |
|---|---|
| Monday Afternoon | SE 0 - 10 |
| Monday Night | SE 10 - 20 |
| Tuesday Morning | SSE 30 - 50 |
| Tuesday Afternoon | SSW 20 - 35 |
| Tuesday Night | SSE 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Afternoon | SE 0 - 10 |
| Monday Night | SE 15 - 25 |
| Tuesday Morning | SE 15 - 25 |
| Tuesday Afternoon | SW 15 - 25 |
| Tuesday Night | S 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Monday Afternoon | SE 5 - 15 |
| Monday Night | SE 10 - 20 |
| Tuesday Morning | SW 15 - 30 |
| Tuesday Afternoon | SW 15 - 25 |
| Tuesday Night | SW 20 - 30 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Afternoon | SE 5 - 15 |
| Monday Night | SSE 15 - 25 |
| Tuesday Morning | S 35 - 50 |
| Tuesday Afternoon | SSW 25 - 35 |
| Tuesday Night | S 15 - 30 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | SE 0 - 10 |
| Monday Night | SE 10 - 20 |
| Tuesday Morning | SSE 30 - 50 |
| Tuesday Afternoon | SSW 20 - 35 |
| Tuesday Night | SSE 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | SE 0 - 10 |
| Monday Night | SE 15 - 25 |
| Tuesday Morning | SE 15 - 25 |
| Tuesday Afternoon | SW 15 - 25 |
| Tuesday Night | S 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | SE 5 - 15 |
| Monday Night | SE 10 - 20 |
| Tuesday Morning | SW 15 - 30 |
| Tuesday Afternoon | SW 15 - 25 |
| Tuesday Night | SW 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 10 - 20 | SW 10 - 20 | SW 15 - 25 | --- - | SW 15 - 25 |
| Monday Night | S 25 - 35 | S 15 - 25 | S 25 - 35 | --- - | SSW 25 - 35 |
| Tuesday Morning | S 40 - 50 | SSW 20 - 30 | SSW 25 - 35 | --- - | SW 50 - 60 |
| Tuesday Afternoon | SW 20 - 30 | SW 25 - 35 | SW 30 - 40 | --- - | SW 40 - 50 |
| Tuesday Night | SW 25 - 35 | SW 20 - 30 | SW 25 - 35 | --- - | SW 30 - 40 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Afternoon | SW 10 - 20 |
| Monday Night | S 25 - 35 |
| Tuesday Morning | S 40 - 50 |
| Tuesday Afternoon | SW 20 - 30 |
| Tuesday Night | SW 25 - 35 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Afternoon | SW 10 - 20 |
| Monday Night | S 15 - 25 |
| Tuesday Morning | SSW 20 - 30 |
| Tuesday Afternoon | SW 25 - 35 |
| Tuesday Night | SW 20 - 30 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Afternoon | SW 15 - 25 |
| Monday Night | S 25 - 35 |
| Tuesday Morning | SSW 25 - 35 |
| Tuesday Afternoon | SW 30 - 40 |
| Tuesday Night | SW 25 - 35 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Afternoon | SW 15 - 25 |
| Monday Night | SSW 25 - 35 |
| Tuesday Morning | SW 50 - 60 |
| Tuesday Afternoon | SW 40 - 50 |
| Tuesday Night | SW 30 - 40 |
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: 2:57 PM PDT Monday, April 9, 2018
Extended Weather Synopsis for Monday night through Monday
Wednesday's frontal system will have a similar track as Tuesday's, curling north of Vancouver Island and sending showers into the region and once again favoring the Mt. Baker area for locally heavier showers in SW flow. The associated longwave upper level trough will pass through the Cascades Thursday morning, keeping us in a cool and showery pattern. Snow levels will be cool enough for light to locally moderate accumulations above 4000' Wednesday through Thursday. Weak shortwave ridging will pass over the area Thursday night but clouds ahead of the next system will prevent a clearing trend.
A strong jet will take aim at the Washington/Canadian border on Friday. Warm frontal moisture from a developing frontal system should move over the area Friday, with higher precipitation amounts expected over the Washington Cascades and less for Mt. Hood. Snow levels will begin a slow climb on Friday as the jet slides north.
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 | 2000' - 3000' | 2000' - 3000' | 2000' - 3000' | |
| Thursday | Snow Level | 2500' - 3500' | 2500' - 3500' | 3000' - 4000' | |
| Thursday Night | Snow Level | 2500' - 3500' | 2500' - 3500' | 3000' - 4000' | |
| Friday | Snow Level | 4000' - 5000' | 4000' - 5000' | 4000' - 5000' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday |
Snow Level 3500' - 4500' |
| Wednesday Night |
Snow Level 2000' - 3000' |
| Thursday |
Snow Level 2500' - 3500' |
| Thursday Night |
Snow Level 2500' - 3500' |
| Friday |
Snow Level 4000' - 5000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday |
Snow Level 3500' - 4500' |
| Wednesday Night |
Snow Level 2000' - 3000' |
| Thursday |
Snow Level 2500' - 3500' |
| Thursday Night |
Snow Level 2500' - 3500' |
| Friday |
Snow Level 4000' - 5000' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday |
Snow Level 4000' - 5000' |
| Wednesday Night |
Snow Level 2000' - 3000' |
| Thursday |
Snow Level 3000' - 4000' |
| Thursday Night |
Snow Level 3000' - 4000' |
| Friday |
Snow Level 4000' - 5000' |
* 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 9, 2018
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