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 & Monday
Moisture continues to stream into the region in NW flow aloft, riding up and over a stationary upper level ridge parked offshore. Moderate to occasionally heavy rain seen along the west slopes of the Cascades today has come to an end as a weak frontal boundary passed through the area earlier this afternoon, changing steady rain to showers with intensities lowering and beginning to usher in somewhat cooler air. The north Cascades on both sides of the crest were again the relatively local cool spot in this rainy pattern, with snow levels peaking around 6000 feet today. Moderate to strong westerly winds will continue in most locations and elevations in this pattern.
Snow levels will gradually fall overnight and settle between 3500-4500 feet on Monday. Showers should continue in W-NW flow, again mainly for the west slopes of the Cascades, with new snowfall accumulations expected above 4000 feet for Snoqualmie Pass to Mt. Baker. A weak upper level feature may enhance shower activity in the north Cascades on Monday.
NW flow will keep plenty of moisture and clouds banked up along the west slopes of the Cascades Monday and Monday night. The ridge will amplify offshore on Monday and begin to slide back towards the PNW Monday night, helping to decrease shower activity.
Weather Forecast
Olympics
| Sunday | Light to occasionally moderate rain becoming light showers mid-day. Mild. |
| Sunday Night | Mostly cloudy with scattered light rain and snow showers. Cooling trend. |
| Monday | Cloudy with light rain and snow showers. Cooler. |
| Monday Night | Mostly cloudy with scattered light rain and snow showers tapering down overnight. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Sunday | Rain, heavy at times becoming light to moderate showers in the afternoon. Less precipitation for the Crystal area. Mild. Slightly cooler with moderate to heavy rain and snow Mt. Baker area. Moderate to strong winds. |
| Sunday Night | Light to occasionally moderate rain and snow showers. Cooling trend. Windy. |
| Monday | Light to occasionally moderate rain and snow showers central and north Cascades. Cloudy with scattered light rain and snow showers south Cascades. Cooler. |
| Monday Night | Mostly cloudy with scattered light rain and snow showers tapering down overnight. |
East Slopes of the Washington Cascades
| Sunday | Light to moderate rain and snow, heaviest near the Cascade crest, becoming light rain and snow showers in the afternoon. Partial clearing further east. Mild. Moderate to strong winds. |
| Sunday Night | Mostly cloudy with light rain and snow showers mainly near the Cascade crest. Cooling trend. Windy. |
| Monday | Mostly cloudy with light rain and snow showers mainly near the Cascade crest. Cooler. |
| Monday Night | Partly to mostly cloudy with scattered light rain and snow showers ending overnight. |
Mt. Hood
| Sunday | Cloudy with periods of light rain and snow increasing in the afternoon. Mild. Windy. |
| Sunday Night | Mostly cloudy with light rain and snow showers. Cooling trend. Windy. |
| Monday | Mostly cloudy with scattered light rain and snow showers. Cooler. |
| Monday Night | Partly to mostly cloudy with isolated light rain and snow showers ending overnight. |
Issued: 3:08 PM PST Sunday, February 4, 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 | Snow Level | 7000' | 6000' | 6000' | ' | ' | 6500' | ' | 7500' |
| Sunday Evening | Snow Level | 6000' | 5000' | 5500' | ' | ' | 5500' | ' | 7000' |
| Sunday Night | Snow Level | 4500' | 4000' | 4500' | ' | ' | 4500' | ' | 5500' |
| Monday | Snow Level | 4000' | 4000' | 4000' | ' | ' | 3500' | ' | 4500' |
| Monday Night | Snow Level | 3500' | 3000' | 3000' | ' | ' | 3000' | ' | 4000' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 7000' |
| Sunday Evening |
Snow Level 6000' |
| Sunday Night |
Snow Level 4500' |
| Monday |
Snow Level 4000' |
| Monday Night |
Snow Level 3500' |
| Mt. Baker | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 6000' |
| Sunday Evening |
Snow Level 5000' |
| Sunday Night |
Snow Level 4000' |
| Monday |
Snow Level 4000' |
| Monday Night |
Snow Level 3000' |
| Washington Pass | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 6000' |
| Sunday Evening |
Snow Level 5500' |
| Sunday Night |
Snow Level 4500' |
| Monday |
Snow Level 4000' |
| Monday Night |
Snow Level 3000' |
| Leavenworth | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level ' |
| Sunday Evening |
Snow Level ' |
| Sunday Night |
Snow Level ' |
| Monday |
Snow Level ' |
| Monday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level ' |
| Sunday Evening |
Snow Level ' |
| Sunday Night |
Snow Level ' |
| Monday |
Snow Level ' |
| Monday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 6500' |
| Sunday Evening |
Snow Level 5500' |
| Sunday Night |
Snow Level 4500' |
| Monday |
Snow Level 3500' |
| Monday Night |
Snow Level 3000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level ' |
| Sunday Evening |
Snow Level ' |
| Sunday Night |
Snow Level ' |
| Monday |
Snow Level ' |
| Monday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Sunday Afternoon |
Snow Level 7500' |
| Sunday Evening |
Snow Level 7000' |
| Sunday Night |
Snow Level 5500' |
| Monday |
Snow Level 4500' |
| Monday 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 0.25 | LT 0.10 |
| Mt Baker Ski Area | 0 - 2.00 | 0 - 0.50 |
| Washington Pass | 0 - 0.75 | LT 0.25 |
| Stevens Pass | 0 - 2.00 | 0.50 - 0.75 |
| Snoqualmie Pass | 0 - 2.00 | 0.50 - 0.75 |
| Mission Ridge | LT 0.10 | LT 0.10 |
| Crystal Mt | LT 0.25 | LT 0.10 |
| Paradise | 1.50 - 2.00 | LT 0.25 |
| White Pass | 0.50 - 0.75 | LT 0.10 |
| Mt Hood Meadows | 0.50 - 0.75 | LT 0.10 |
| Timberline | 0.50 - 0.75 | 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: 3:08 PM PST Sunday, February 4, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Afternoon | WSW 20 - 30 | SW 20 - 30 | SW 25 - 45 | --- - | WSW 25 - 35 |
| Sunday Night | W 15 - 25 | WSW 15 - 25 | WSW 15 - 30 | --- - | W 25 - 35 |
| Monday Morning | W 10 - 20 | SW 10 - 20 | WSW 15 - 25 | --- - | W 20 - 30 |
| Monday Afternoon | W 15 - 25 | SW 10 - 20 | WSW 10 - 20 | --- - | W 20 - 30 |
| Monday Night | W 10 - 20 | SW 5 - 15 | W 10 - 20 | --- - | W 15 - 25 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Afternoon | WSW 20 - 30 |
| Sunday Night | W 15 - 25 |
| Monday Morning | W 10 - 20 |
| Monday Afternoon | W 15 - 25 |
| Monday Night | W 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Afternoon | SW 20 - 30 |
| Sunday Night | WSW 15 - 25 |
| Monday Morning | SW 10 - 20 |
| Monday Afternoon | SW 10 - 20 |
| Monday Night | SW 5 - 15 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Afternoon | SW 25 - 45 |
| Sunday Night | WSW 15 - 30 |
| Monday Morning | WSW 15 - 25 |
| Monday Afternoon | WSW 10 - 20 |
| Monday Night | W 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Sunday Afternoon | WSW 25 - 35 |
| Sunday Night | W 25 - 35 |
| Monday Morning | W 20 - 30 |
| Monday Afternoon | W 20 - 30 |
| Monday Night | W 15 - 25 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Afternoon | WSW 20 - 30 |
| Sunday Night | W 15 - 25 |
| Monday Morning | W 10 - 20 |
| Monday Afternoon | W 15 - 25 |
| Monday Night | W 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Afternoon | SW 20 - 30 |
| Sunday Night | WSW 15 - 25 |
| Monday Morning | SW 10 - 20 |
| Monday Afternoon | SW 10 - 20 |
| Monday Night | SW 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | SW 25 - 45 |
| Sunday Night | WSW 15 - 30 |
| Monday Morning | WSW 15 - 25 |
| Monday Afternoon | WSW 10 - 20 |
| Monday Night | W 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Afternoon | WSW 25 - 35 |
| Sunday Night | W 25 - 35 |
| Monday Morning | W 20 - 30 |
| Monday Afternoon | W 20 - 30 |
| Monday Night | W 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.
Free Winds at 9000' (mph)
| Mt. Baker | Washington Pass | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Afternoon | W 40 - 50 | W 55 - 65 | W 50 - 60 | --- - | W 50 - 60 |
| Sunday Night | W 30 - 40 | W 40 - 50 | WNW 40 - 50 | --- - | WNW 45 - 55 |
| Monday Morning | W 20 - 30 | W 20 - 30 | NW 30 - 40 | --- - | NW 45 - 55 |
| Monday Afternoon | W 15 - 25 | W 20 - 30 | NW 30 - 40 | --- - | NW 45 - 55 |
| Monday Night | WNW 10 - 20 | WNW 15 - 25 | NW 30 - 40 | --- - | NW 50 - 60 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Afternoon | W 40 - 50 |
| Sunday Night | W 30 - 40 |
| Monday Morning | W 20 - 30 |
| Monday Afternoon | W 15 - 25 |
| Monday Night | WNW 10 - 20 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | W 55 - 65 |
| Sunday Night | W 40 - 50 |
| Monday Morning | W 20 - 30 |
| Monday Afternoon | W 20 - 30 |
| Monday Night | WNW 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Afternoon | W 50 - 60 |
| Sunday Night | WNW 40 - 50 |
| Monday Morning | NW 30 - 40 |
| Monday Afternoon | NW 30 - 40 |
| Monday Night | NW 30 - 40 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Afternoon | W 50 - 60 |
| Sunday Night | WNW 45 - 55 |
| Monday Morning | NW 45 - 55 |
| Monday Afternoon | NW 45 - 55 |
| Monday Night | NW 50 - 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: 3:08 PM PST Sunday, February 4, 2018
Extended Weather Synopsis for Monday night through Monday
This quasi-stationary longwave ridge pattern will hold through the extended period and potentially longer with NW flow aloft and moist but generally mild weather systems coming up and over the ridge and afflicting the Pacific Northwest. The next system should arrive sometime Tuesday afternoon or evening, with precipitation again mainly affecting the west slopes of the central and north Cascades. On Wednesday the upper level ridge offshore should push the main moisture plume a bit further north, allowing for overall warming and some clearing for the south Washington Cascades and Mt. Hood. Thursday, a stronger frontal system is pegged to temporarily collapse the ridge as precipitation pushes south into the area.
Extended Weather
Olympics, Washington Cascades and Mt. Hood Area
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Tuesday | Snow Level | 3000' - 4000' | 3000' - 4000' | 3500' - 4500' | |
| Tuesday Night | Snow Level | 3000' - 4000' | 3500' - 4500' | 5500' - 6500' | |
| Wednesday | Snow Level | 4500' - 5500' | 5000' - 6000' | 7000' - 8000' | |
| Wednesday Night | Snow Level | 5500' - 6500' | 6000' - 7000' | 8000' - 9000' | |
| Thursday | Snow Level | 5500' - 6500' | 5500' - 6500' | 7000' - 8000' |
| Mt. Baker | Elevation |
|---|---|
| Tuesday |
Snow Level 3000' - 4000' |
| Tuesday Night |
Snow Level 3000' - 4000' |
| Wednesday |
Snow Level 4500' - 5500' |
| Wednesday Night |
Snow Level 5500' - 6500' |
| Thursday |
Snow Level 5500' - 6500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday |
Snow Level 3000' - 4000' |
| Tuesday Night |
Snow Level 3500' - 4500' |
| Wednesday |
Snow Level 5000' - 6000' |
| Wednesday Night |
Snow Level 6000' - 7000' |
| Thursday |
Snow Level 5500' - 6500' |
| Mt. Hood | Elevation |
|---|---|
| Tuesday |
Snow Level 3500' - 4500' |
| Tuesday Night |
Snow Level 5500' - 6500' |
| Wednesday |
Snow Level 7000' - 8000' |
| Wednesday Night |
Snow Level 8000' - 9000' |
| Thursday |
Snow Level 7000' - 8000' |
* 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 Feb 4, 2018
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