Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Weather Synopsis for Thursday & Tuesday
A vertically stacked low pressure system off the Washington/British Columbia border will continue the unsettled weather pattern for the Pacific Northwest over the short term. An upper level shortwave lifted north over the area Wednesday night, resulting in modest amounts of precipitation and new snow above 4000 feet along both the east slopes and west slopes of the Cascades. A band of showers along the Washington/Oregon border this morning should mainly affect the Olympics and peter out as they push into the Cascades. With a cool unstable air mass overhead, look for increasing shower activity this afternoon over the Cascades. The air mass is marginally unstable such that an isolated thunderstorm can't be ruled out this afternoon. Shower activity should wane overnight with the loss of day-time heating.
The story on Friday will be similar with the same low pressure system meandering north and west and further away from Vancouver Island. The air mass will be slightly cooler on Friday. An upper level shortwave swinging through in the late afternoon/early evening should cause for a period of more moderate showers especially for the west slopes of the Cascades including Mt. Hood. A Puget Sound Convergence zone may form during this period causing locally higher accumulations in the Mountain Loop Region. Shower activity should once again ease Friday night.
Weather Forecast
Olympics, Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Thursday Morning |
Cloudy northwest Cascades with light to occasionally moderate rain and showers. Mostly cloudy with scattered light rain and snow showers central-west and southwest Cascades. |
| Thursday Afternoon - Thursday Evening |
Mostly cloudy with light to occasionally moderate rain and snow showers. Afternoon sunbreaks possible. Slight chance of a thunderstorm. |
| Thursday Night - Friday Morning |
Mostly cloudy with scattered light rain and snow showers. |
| Friday Afternoon - Friday Evening |
Mostly cloudy with light rain to occasionally moderate rain and snow showers. Afternoon sunbreaks possible. Slight chance of a thunderstorm in the afternoon and evening. Locally heavier accumulations possible near a convergence zone Mountain Loop area. |
| Friday Night |
Partly to mostly cloudy with scattered light rain and snow showers diminishing overnight. |
Olympics
| Thursday Morning |
Mostly cloudy with scattered light to occasionally moderate rain and snow showers. |
| Thursday Afternoon - Thursday Evening |
Mostly cloudy with light to occasionally moderate rain and snow showers. Afternoon sunbreaks possible. Slight chance of a thunderstorm. |
| Thursday Night - Friday Morning |
Mostly cloudy with scattered light rain and snow showers. |
| Friday Afternoon - Friday Evening |
Mostly cloudy with light rain to occasionally moderate rain and snow showers. Afternoon sunbreaks possible. Slight chance of a thunderstorm. |
| Friday Night |
Partly to mostly cloudy with scattered light rain and snow showers diminishing overnight. |
East slopes of the Washington Cascades
| Thursday Morning |
Cloudy northeast Cascades with light to occasionally moderate rain and showers. Partly to mostly cloudy with scattered light rain and snow showers central-west and southwest Cascades. |
| Thursday Mid-day - Thursday Evening |
Mostly cloudy with light to occasionally moderate rain and snow showers, heaviest near the Cascade crest. Afternoon sunbreaks possible. Slight chance of a thunderstorm. |
| Thursday Night - Friday Morning |
Partly cloudy with isolated light rain and snow showers. |
| Friday Afternoon - Friday Evening |
Mostly cloudy with light rain to occasionally moderate rain and snow showers especially near the Cascade crest. Afternoon sunbreaks possible. Slight chance of a thunderstorm. |
| Friday Night |
Partly cloudy with scattered light rain and snow showers diminishing overnight. |
Mt. Hood Area
| Thursday Morning |
Mostly cloudy with scattered light rain and snow showers. |
| Thursday Afternoon - Thursday Evening |
Mostly cloudy with light to occasionally moderate rain and snow showers. Afternoon sunbreaks possible. Slight chance of a thunderstorm. |
| Thursday Night - Friday Morning |
Mostly cloudy with scattered light rain and snow showers. |
| Friday Afternoon - Friday Evening |
Mostly cloudy with light rain to occasionally moderate rain and snow showers. Afternoon sunbreaks possible. Slight chance of a thunderstorm. |
| Friday Night |
Partly to mostly cloudy with scattered light rain and snow showers diminishing overnight. |
Issued: 7:54 AM PDT Thursday, April 13, 2017
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Thursday Morning | Snow Level | 3000' | 3000' | 3500' | ' | ' | 3000' | ' | 3000' |
| Thursday Afternoon | Snow Level | 5000' | 4500' | 5000' | ' | ' | 4500' | ' | 5000' |
| Thursday Night - Friday Morning | Snow Level | 2500' | 2500' | 2000' | ' | ' | 2500' | ' | 2500' |
| Friday Afternoon | Snow Level | 3500' | 3500' | 4000' | ' | ' | 3500' | ' | 4000' |
| Friday Night | Snow Level | 2500' | 2500' | 2000' | ' | ' | 2500' | ' | 2500' |
| Hurricane Ridge | Elevation |
|---|---|
| Thursday Morning |
Snow Level 3000' |
| Thursday Afternoon |
Snow Level 5000' |
| Thursday Night - Friday Morning |
Snow Level 2500' |
| Friday Afternoon |
Snow Level 3500' |
| Friday Night |
Snow Level 2500' |
| Mt. Baker | Elevation |
|---|---|
| Thursday Morning |
Snow Level 3000' |
| Thursday Afternoon |
Snow Level 4500' |
| Thursday Night - Friday Morning |
Snow Level 2500' |
| Friday Afternoon |
Snow Level 3500' |
| Friday Night |
Snow Level 2500' |
| Washington Pass | Elevation |
|---|---|
| Thursday Morning |
Snow Level 3500' |
| Thursday Afternoon |
Snow Level 5000' |
| Thursday Night - Friday Morning |
Snow Level 2000' |
| Friday Afternoon |
Snow Level 4000' |
| Friday Night |
Snow Level 2000' |
| Leavenworth | Elevation |
|---|---|
| Thursday Morning |
Snow Level ' |
| Thursday Afternoon |
Snow Level ' |
| Thursday Night - Friday Morning |
Snow Level ' |
| Friday Afternoon |
Snow Level ' |
| Friday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Thursday Morning |
Snow Level ' |
| Thursday Afternoon |
Snow Level ' |
| Thursday Night - Friday Morning |
Snow Level ' |
| Friday Afternoon |
Snow Level ' |
| Friday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Thursday Morning |
Snow Level 3000' |
| Thursday Afternoon |
Snow Level 4500' |
| Thursday Night - Friday Morning |
Snow Level 2500' |
| Friday Afternoon |
Snow Level 3500' |
| Friday Night |
Snow Level 2500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Thursday Morning |
Snow Level ' |
| Thursday Afternoon |
Snow Level ' |
| Thursday Night - Friday Morning |
Snow Level ' |
| Friday Afternoon |
Snow Level ' |
| Friday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Thursday Morning |
Snow Level 3000' |
| Thursday Afternoon |
Snow Level 5000' |
| Thursday Night - Friday Morning |
Snow Level 2500' |
| Friday Afternoon |
Snow Level 4000' |
| Friday Night |
Snow Level 2500' |
* 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
| Tuesday | Tuesday | |
|---|---|---|
| Hurricane Ridge | LT 0.25 | LT 0.25 |
| Mt Baker Ski Area | 0 - 1.00 | 0.25 - 0.50 |
| Washington Pass | 0 - 0.50 | LT 0.25 |
| Stevens Pass | 0 - 0.50 | 0.50 - 0.75 |
| Snoqualmie Pass | 0 - 0.50 | 0.50 - 0.75 |
| Mission Ridge | LT 0.25 | LT 0.10 |
| Crystal Mt | LT 0.25 | 0.25 - 0.50 |
| Paradise | 0.50 - 0.75 | 0.50 - 0.75 |
| White Pass | 0.25 - 0.50 | 0 - 0.50 |
| Mt Hood Meadows | 0.25 - 0.50 | 0.25 - 0.50 |
| Timberline | 0 - 0.50 | 0 - 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: 7:54 AM PDT Thursday, April 13, 2017
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Thursday Morning | S 15 - 25 | SSW 15 - 25 | SW 5 - 15 | --- - | SW 10 - 20 |
| Thursday Afternoon | SW 10 - 20 | SW 15 - 25 | WSW 10 - 20 | --- - | WSW 10 - 20 |
| Thursday Night - Friday Morning | SW 5 - 15 | SW 5 - 15 | WSW 10 - 20 | --- - | WSW 15 - 25 |
| Friday Afternoon | SW 5 - 15 | SW 5 - 15 | WSW 15 - 25 | --- - | WSW 15 - 25 |
| Friday Night | SW 0 - 10 | SW 0 - 10 | WSW 10 - 20 | --- - | WSW 10 - 20 |
| Hurricane Ridge | Elevation |
|---|---|
| Thursday Morning | S 15 - 25 |
| Thursday Afternoon | SW 10 - 20 |
| Thursday Night - Friday Morning | SW 5 - 15 |
| Friday Afternoon | SW 5 - 15 |
| Friday Night | SW 0 - 10 |
| Mt. Baker | Elevation |
|---|---|
| Thursday Morning | SSW 15 - 25 |
| Thursday Afternoon | SW 15 - 25 |
| Thursday Night - Friday Morning | SW 5 - 15 |
| Friday Afternoon | SW 5 - 15 |
| Friday Night | SW 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Thursday Morning | SW 5 - 15 |
| Thursday Afternoon | WSW 10 - 20 |
| Thursday Night - Friday Morning | WSW 10 - 20 |
| Friday Afternoon | WSW 15 - 25 |
| Friday Night | WSW 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night - Friday Morning | --- - |
| Friday Afternoon | --- - |
| Friday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Thursday Morning | SW 10 - 20 |
| Thursday Afternoon | WSW 10 - 20 |
| Thursday Night - Friday Morning | WSW 15 - 25 |
| Friday Afternoon | WSW 15 - 25 |
| Friday Night | WSW 10 - 20 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Thursday Morning | S 15 - 25 |
| Thursday Afternoon | SW 10 - 20 |
| Thursday Night - Friday Morning | SW 5 - 15 |
| Friday Afternoon | SW 5 - 15 |
| Friday Night | SW 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Thursday Morning | SSW 15 - 25 |
| Thursday Afternoon | SW 15 - 25 |
| Thursday Night - Friday Morning | SW 5 - 15 |
| Friday Afternoon | SW 5 - 15 |
| Friday Night | SW 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Thursday Morning | SW 5 - 15 |
| Thursday Afternoon | WSW 10 - 20 |
| Thursday Night - Friday Morning | WSW 10 - 20 |
| Friday Afternoon | WSW 15 - 25 |
| Friday Night | WSW 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night - Friday Morning | --- - |
| Friday Afternoon | --- - |
| Friday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Thursday Morning | SW 10 - 20 |
| Thursday Afternoon | WSW 10 - 20 |
| Thursday Night - Friday Morning | WSW 15 - 25 |
| Friday Afternoon | WSW 15 - 25 |
| Friday Night | WSW 10 - 20 |
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 | |
|---|---|---|---|---|---|
| Thursday Morning | SW 10 - 20 | SSE 10 - 20 | SW 10 - 20 | --- - | SW 25 - 35 |
| Thursday Afternoon | SW 20 - 30 | SW 10 - 20 | SW 20 - 30 | --- - | SW 25 - 35 |
| Thursday Night - Friday Morning | SW 10 - 20 | W 5 - 15 | W 20 - 30 | --- - | W 20 - 30 |
| Friday Afternoon | W 10 - 20 | W 10 - 20 | WSW 20 - 30 | --- - | WSW 25 - 35 |
| Friday Afternoon - Friday Night | W 10 - 20 | W 15 - 25 | W 15 - 25 | --- - | W 20 - 30 |
| Mt. Baker | Direction - Speed |
|---|---|
| Thursday Morning | SW 10 - 20 |
| Thursday Afternoon | SW 20 - 30 |
| Thursday Night - Friday Morning | SW 10 - 20 |
| Friday Afternoon | W 10 - 20 |
| Friday Afternoon - Friday Night | W 10 - 20 |
| Washington Pass | Direction - Speed |
|---|---|
| Thursday Morning | SSE 10 - 20 |
| Thursday Afternoon | SW 10 - 20 |
| Thursday Night - Friday Morning | W 5 - 15 |
| Friday Afternoon | W 10 - 20 |
| Friday Afternoon - Friday Night | W 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Thursday Morning | SW 10 - 20 |
| Thursday Afternoon | SW 20 - 30 |
| Thursday Night - Friday Morning | W 20 - 30 |
| Friday Afternoon | WSW 20 - 30 |
| Friday Afternoon - Friday Night | W 15 - 25 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night - Friday Morning | --- - |
| Friday Afternoon | --- - |
| Friday Afternoon - Friday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Thursday Morning | SW 25 - 35 |
| Thursday Afternoon | SW 25 - 35 |
| Thursday Night - Friday Morning | W 20 - 30 |
| Friday Afternoon | WSW 25 - 35 |
| Friday Afternoon - Friday Night | W 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.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Previous forecast from Apr 10, 2017
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