Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Weather Synopsis for Wednesday & Friday
On Wednesday morning, a shortwave trough embedded in Northwest flow aloft is sliding over the Pacific Northwest and has replaced a tongue of Tuesday's offshore high pressure ridge which had kept us under warm and generally fair weather. The relatively stationary Pacific High pressure dominates all but the peripheries of the North Pacific Ocean.
A surface cold front passed to our east on Tuesday night, brought a significant decrease in temperatures (now most stations are in the 20's and 10's) with decreasing post-frontal westerly flow and generally decreasing light to moderate snow showers. A band of heavier convergence is currently moving south of Stevens pass toward Snoqualmie pass. Snow showers will be heaviest along the west slopes of the Cascades from the central Cascades to Mt. Hood. Any snow shower activity should be light by the afternoon and most areas will see snow showers ending by evening.
Upper-level northwest flow will continue with a break between the systems generally Wednesday night through Thursday, with some very light snow shower activity continuing in the Mt. Hood area during this period.
Thursday night, another upper shortwave approaches from the northwest, spreading increasing light to occasional moderate snow into the region. The brunt of this system won't arrive until daylight hours on Friday.
Weather Forecast
Olympics
| Wednesday | Light snow showers ending early, leaving decreasing clouds with mostly sunny conditions by afternoon. |
| Wednesday Night | Mostly clear with increasing high clouds toward morning. |
| Thursday | High clouds. |
| Thursday Night | Clouds lowering and light snow developing after midnight. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Wednesday | Decreasing light snow showers during the morning hours in the north, then becoming partly sunny. Decreasing light to moderate snow showers in the morning, central and south, with some convergence from Stevens to Snoqualmie. Very light snow showers decreasing in the afternoon with some sun breaks. |
| Wednesday Night | Mostly cloudy with chance of a very light snow shower central and south. Mostly clear, north. |
| Thursday | Increasing high clouds throughout, with scattered low clouds central and south. Light snow developing late in the central and south parts. |
| Thursday Night | Light snow becoming moderate after midnight. |
East Slopes of the Washington Cascades
| Wednesday | Becoming partly sunny in the north. Decreasing light snow showers in the morning, central and south. |
| Wednesday Night | Mostly clear with some clouds near the crest, central and south. |
| Thursday | Increasing high clouds |
| Thursday Night | Light snow developing and increasing to light to moderate by morning. |
Mt. Hood
| Wednesday | Moderate snow showers decreasing late morning and becoming light during the afternoon. |
| Wednesday Night | Mostly cloudy with isolated, light snow showers. |
| Thursday | Mostly cloudy with light snow showers. |
| Thursday Night | Isolated light snow showers becoming light to moderate snow by morning. |
Issued: 7:36 AM PST Wednesday, February 14, 2018
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Wednesday Morning | Snow Level | 1000' | 1000' | 1500' | ' | ' | 2000' | ' | 2000' |
| Wednesday Afternoon | Snow Level | 2500' | 2000' | 2000' | ' | ' | 2000' | ' | 2500' |
| Wednesday Night | Snow Level | 1500' | 1000' | 500' | ' | ' | 1000' | ' | 2000' |
| Thursday Morning | Snow Level | 1500' | 1000' | 1000' | ' | ' | 2000' | ' | 2000' |
| Thursday Afternoon | Snow Level | 2000' | 1500' | 1500' | ' | ' | 2000' | ' | 2500' |
| Thursday Night | Snow Level | 1500' | 1500' | 1500' | ' | ' | 2000' | ' | 2000' |
| Hurricane Ridge | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 1000' |
| Wednesday Afternoon |
Snow Level 2500' |
| Wednesday Night |
Snow Level 1500' |
| Thursday Morning |
Snow Level 1500' |
| Thursday Afternoon |
Snow Level 2000' |
| Thursday Night |
Snow Level 1500' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 1000' |
| Wednesday Afternoon |
Snow Level 2000' |
| Wednesday Night |
Snow Level 1000' |
| Thursday Morning |
Snow Level 1000' |
| Thursday Afternoon |
Snow Level 1500' |
| Thursday Night |
Snow Level 1500' |
| Washington Pass | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 1500' |
| Wednesday Afternoon |
Snow Level 2000' |
| Wednesday Night |
Snow Level 500' |
| Thursday Morning |
Snow Level 1000' |
| Thursday Afternoon |
Snow Level 1500' |
| Thursday Night |
Snow Level 1500' |
| Leavenworth | Elevation |
|---|---|
| Wednesday Morning |
Snow Level ' |
| Wednesday Afternoon |
Snow Level ' |
| Wednesday Night |
Snow Level ' |
| Thursday Morning |
Snow Level ' |
| Thursday Afternoon |
Snow Level ' |
| Thursday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Wednesday Morning |
Snow Level ' |
| Wednesday Afternoon |
Snow Level ' |
| Wednesday Night |
Snow Level ' |
| Thursday Morning |
Snow Level ' |
| Thursday Afternoon |
Snow Level ' |
| Thursday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 2000' |
| Wednesday Afternoon |
Snow Level 2000' |
| Wednesday Night |
Snow Level 1000' |
| Thursday Morning |
Snow Level 2000' |
| Thursday Afternoon |
Snow Level 2000' |
| Thursday Night |
Snow Level 2000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Wednesday Morning |
Snow Level ' |
| Wednesday Afternoon |
Snow Level ' |
| Wednesday Night |
Snow Level ' |
| Thursday Morning |
Snow Level ' |
| Thursday Afternoon |
Snow Level ' |
| Thursday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 2000' |
| Wednesday Afternoon |
Snow Level 2500' |
| Wednesday Night |
Snow Level 2000' |
| Thursday Morning |
Snow Level 2000' |
| Thursday Afternoon |
Snow Level 2500' |
| Thursday 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 0.10 | LT 0.25 |
| Mt Baker Ski Area | LT 0.25 | LT 0.25 |
| Washington Pass | LT 0.25 | LT 0.10 |
| Stevens Pass | 0.25 - 0.50 | LT 0.25 |
| Snoqualmie Pass | 0 - 0.50 | 0.25 - 0.50 |
| Mission Ridge | LT 0.10 | LT 0.10 |
| Crystal Mt | LT 0.25 | LT 0.10 |
| Paradise | 0.25 - 0.50 | LT 0.25 |
| White Pass | LT 0.25 | LT 0.25 |
| Mt Hood Meadows | 0.50 - 0.75 | LT 0.10 |
| Timberline | 0 - 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: 7:36 AM PST Wednesday, February 14, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Wednesday Morning | WNW 10 - 20 | NE 5 - 15 | WSW 10 - 20 | --- - | W 20 - 30 |
| Wednesday Afternoon | WNW 5 - 15 | WNW 5 - 15 | W 10 - 20 | --- - | W 20 - 30 |
| Wednesday Night | WNW 5 - 15 | WNW 5 - 15 | W 5 - 15 | --- - | W 20 - 30 |
| Thursday Morning | WSW 5 - 15 | SSW 5 - 15 | WNW 5 - 15 | --- - | W 15 - 25 |
| Thursday Afternoon | WSW 10 - 20 | SSW 10 - 20 | WSW 15 - 25 | --- - | WSW 20 - 30 |
| Thursday Night | WSW 20 - 30 | SW 15 - 25 | WSW 20 - 30 | --- - | WSW 25 - 35 |
| Hurricane Ridge | Elevation |
|---|---|
| Wednesday Morning | WNW 10 - 20 |
| Wednesday Afternoon | WNW 5 - 15 |
| Wednesday Night | WNW 5 - 15 |
| Thursday Morning | WSW 5 - 15 |
| Thursday Afternoon | WSW 10 - 20 |
| Thursday Night | WSW 20 - 30 |
| Mt. Baker | Elevation |
|---|---|
| Wednesday Morning | NE 5 - 15 |
| Wednesday Afternoon | WNW 5 - 15 |
| Wednesday Night | WNW 5 - 15 |
| Thursday Morning | SSW 5 - 15 |
| Thursday Afternoon | SSW 10 - 20 |
| Thursday Night | SW 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Wednesday Morning | WSW 10 - 20 |
| Wednesday Afternoon | W 10 - 20 |
| Wednesday Night | W 5 - 15 |
| Thursday Morning | WNW 5 - 15 |
| Thursday Afternoon | WSW 15 - 25 |
| Thursday Night | WSW 20 - 30 |
| Mt. Rainier | Elevation |
|---|---|
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Wednesday Morning | W 20 - 30 |
| Wednesday Afternoon | W 20 - 30 |
| Wednesday Night | W 20 - 30 |
| Thursday Morning | W 15 - 25 |
| Thursday Afternoon | WSW 20 - 30 |
| Thursday Night | WSW 25 - 35 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Wednesday Morning | WNW 10 - 20 |
| Wednesday Afternoon | WNW 5 - 15 |
| Wednesday Night | WNW 5 - 15 |
| Thursday Morning | WSW 5 - 15 |
| Thursday Afternoon | WSW 10 - 20 |
| Thursday Night | WSW 20 - 30 |
| Mt. Baker | Direction - Speed |
|---|---|
| Wednesday Morning | NE 5 - 15 |
| Wednesday Afternoon | WNW 5 - 15 |
| Wednesday Night | WNW 5 - 15 |
| Thursday Morning | SSW 5 - 15 |
| Thursday Afternoon | SSW 10 - 20 |
| Thursday Night | SW 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Wednesday Morning | WSW 10 - 20 |
| Wednesday Afternoon | W 10 - 20 |
| Wednesday Night | W 5 - 15 |
| Thursday Morning | WNW 5 - 15 |
| Thursday Afternoon | WSW 15 - 25 |
| Thursday Night | WSW 20 - 30 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Wednesday Morning | W 20 - 30 |
| Wednesday Afternoon | W 20 - 30 |
| Wednesday Night | W 20 - 30 |
| Thursday Morning | W 15 - 25 |
| Thursday Afternoon | WSW 20 - 30 |
| Thursday Night | WSW 25 - 35 |
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 | |
|---|---|---|---|---|---|
| Wednesday Morning | NE 5 - 15 | N 15 - 25 | WNW 15 - 25 | --- - | W 35 - 50 |
| Wednesday Afternoon | NW 10 - 20 | NW 15 - 25 | NW 20 - 30 | --- - | WNW 30 - 40 |
| Wednesday Night | NW 15 - 25 | NW 15 - 25 | NW 30 - 40 | --- - | NW 30 - 40 |
| Thursday Morning | W 10 - 20 | W 10 - 20 | WNW 15 - 25 | --- - | NW 20 - 30 |
| Thursday Afternoon | WSW 15 - 25 | WSW 15 - 25 | W 20 - 30 | --- - | W 25 - 35 |
| Thursday Night | WSW 30 - 40 | WSW 35 - 50 | W 40 - 60 | --- - | WNW 35 - 50 |
| Mt. Baker | Direction - Speed |
|---|---|
| Wednesday Morning | NE 5 - 15 |
| Wednesday Afternoon | NW 10 - 20 |
| Wednesday Night | NW 15 - 25 |
| Thursday Morning | W 10 - 20 |
| Thursday Afternoon | WSW 15 - 25 |
| Thursday Night | WSW 30 - 40 |
| Washington Pass | Direction - Speed |
|---|---|
| Wednesday Morning | N 15 - 25 |
| Wednesday Afternoon | NW 15 - 25 |
| Wednesday Night | NW 15 - 25 |
| Thursday Morning | W 10 - 20 |
| Thursday Afternoon | WSW 15 - 25 |
| Thursday Night | WSW 35 - 50 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Wednesday Morning | WNW 15 - 25 |
| Wednesday Afternoon | NW 20 - 30 |
| Wednesday Night | NW 30 - 40 |
| Thursday Morning | WNW 15 - 25 |
| Thursday Afternoon | W 20 - 30 |
| Thursday Night | W 40 - 60 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Wednesday Morning | W 35 - 50 |
| Wednesday Afternoon | WNW 30 - 40 |
| Wednesday Night | NW 30 - 40 |
| Thursday Morning | NW 20 - 30 |
| Thursday Afternoon | W 25 - 35 |
| Thursday Night | WNW 35 - 50 |
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.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Previous forecast from Feb 13, 2018
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