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Weather Synopsis for Wednesday & Thursday
A ridge of high pressure located between 130 and 135 W sits off the coast of California on Wednesday morning. A moderate jetstream passes over the ridge through southern British Columbia on NW flow aloft. With small amounts of lingering moisture and moderate winds at crest-level, the west slopes of the Cascades are seeing some very light showers, decreasing and ending this morning, with some very weak convergence in the Snoqualmie Pass vicinity.
A mostly cloudy day can be expected for the west slopes of the Cascades from the central Cascades northward, with more sunshine elsewhere.
Tonight and Thursday, periods of very light rain and snow will develop in the north and central parts of the Cascades ahead of a weak low pressure system approaching the central British Columbia Coastline on Thursday. Thursday night, the associated frontal system drops SE, continuing the light precipitation in the same areas.
Areas south of Snoqualmie Pass, east of the Cascade Crest, and the Olympics should all see generally fair weather with scattered clouds, high clouds, or sunshine.
Weather Forecast
Olympics
| Wednesday | Mostly sunny with some high clouds or cumulus clouds mixed in. |
| Wednesday Night | Increasing clouds. |
| Thursday | Cloudy with a chance of light rain or snow in the morning. Becoming mostly cloudy in the afternoon. |
| Thursday Night | Partly clear. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Wednesday | Mostly cloudy with a chance of very light showers in the morning, north and central parts. Mostly sunny south. |
| Wednesday Night | Very light rain developing at times north and central parts. Central part, decreasing clouds after midnight. Mostly clear south.Mostly cloudy north, decreasing clouds central, and mostly clear south. |
| Thursday | Partly cloudy north, clearing central, clear south. |
| Thursday Night | Mostly cloudy north of Snoqualmie Pass and mostly clear to the south. |
East Slopes of the Washington Cascades
| Wednesday | Partly cloudy north and central parts. Mostly sunny south. |
| Wednesday Night | Mostly cloudy north with a chance of very light rain, decreasing clouds central, and mostly clear south. |
| Thursday | Partly cloudy north, clearing central, clear south. |
| Thursday Night | Partly cloudy north of Snoqualmie Pass and mostly clear to the south. |
Mt. Hood
| Wednesday | Filtered sunshine. |
| Wednesday Night | Mostly clear. |
| Thursday | Filtered sunshine. |
| Thursday Night | Clear with increasing clouds by morning. |
Issued: 7:50 AM PDT Wednesday, March 28, 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 | 3000' | 3000' | 3000' | ' | ' | 3000' | ' | 4000' |
| Wednesday Afternoon | Snow Level | 3500' | 3000' | 4000' | ' | ' | 3500' | ' | 4500' |
| Wednesday Night | Snow Level | 3000' | 2500' | 2500' | ' | ' | 3000' | ' | 4500' |
| Thursday Morning | Snow Level | 4000' | 3500' | 4000' | ' | ' | 3500' | ' | 6000' |
| Thursday Afternoon | Snow Level | 4000' | 3500' | 4500' | ' | ' | 4500' | ' | 7000' |
| Thursday Night | Snow Level | 4500' | 3500' | 3500' | ' | ' | 4000' | ' | 6000' |
| Hurricane Ridge | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 3000' |
| Wednesday Afternoon |
Snow Level 3500' |
| Wednesday Night |
Snow Level 3000' |
| Thursday Morning |
Snow Level 4000' |
| Thursday Afternoon |
Snow Level 4000' |
| Thursday Night |
Snow Level 4500' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 3000' |
| Wednesday Afternoon |
Snow Level 3000' |
| Wednesday Night |
Snow Level 2500' |
| Thursday Morning |
Snow Level 3500' |
| Thursday Afternoon |
Snow Level 3500' |
| Thursday Night |
Snow Level 3500' |
| Washington Pass | Elevation |
|---|---|
| Wednesday Morning |
Snow Level 3000' |
| Wednesday Afternoon |
Snow Level 4000' |
| Wednesday Night |
Snow Level 2500' |
| Thursday Morning |
Snow Level 4000' |
| Thursday Afternoon |
Snow Level 4500' |
| Thursday Night |
Snow Level 3500' |
| 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 3000' |
| Wednesday Afternoon |
Snow Level 3500' |
| Wednesday Night |
Snow Level 3000' |
| Thursday Morning |
Snow Level 3500' |
| Thursday Afternoon |
Snow Level 4500' |
| Thursday Night |
Snow Level 4000' |
| 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 4000' |
| Wednesday Afternoon |
Snow Level 4500' |
| Wednesday Night |
Snow Level 4500' |
| Thursday Morning |
Snow Level 6000' |
| Thursday Afternoon |
Snow Level 7000' |
| Thursday Night |
Snow Level 6000' |
* 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
| Thursday | Thursday | |
|---|---|---|
| Hurricane Ridge | LT 0.10 | LT 0.10 |
| Mt Baker Ski Area | LT 0.10 | 0.25 - 0.50 |
| Washington Pass | LT 0.10 | LT 0.10 |
| Stevens Pass | LT 0.10 | LT 0.25 |
| 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: 7:50 AM PDT Wednesday, March 28, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Wednesday Morning | W 15 - 25 | WSW 5 - 15 | W 10 - 20 | --- - | W 15 - 25 |
| Wednesday Afternoon | W 20 - 30 | W 10 - 20 | W 10 - 20 | --- - | W 15 - 25 |
| Wednesday Night | W 15 - 25 | W 5 - 15 | W 15 - 25 | --- - | W 20 - 30 |
| Thursday Morning | W 15 - 25 | WSW 10 - 20 | W 5 - 15 | --- - | W 15 - 25 |
| Thursday Afternoon | WSW 10 - 20 | WSW 15 - 25 | W 10 - 20 | --- - | W 10 - 20 |
| Thursday Night | WSW 15 - 25 | WSW 15 - 25 | W 10 - 20 | --- - | W 10 - 20 |
| Hurricane Ridge | Elevation |
|---|---|
| Wednesday Morning | W 15 - 25 |
| Wednesday Afternoon | W 20 - 30 |
| Wednesday Night | W 15 - 25 |
| Thursday Morning | W 15 - 25 |
| Thursday Afternoon | WSW 10 - 20 |
| Thursday Night | WSW 15 - 25 |
| Mt. Baker | Elevation |
|---|---|
| Wednesday Morning | WSW 5 - 15 |
| Wednesday Afternoon | W 10 - 20 |
| Wednesday Night | W 5 - 15 |
| Thursday Morning | WSW 10 - 20 |
| Thursday Afternoon | WSW 15 - 25 |
| Thursday Night | WSW 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Wednesday Morning | W 10 - 20 |
| Wednesday Afternoon | W 10 - 20 |
| Wednesday Night | W 15 - 25 |
| Thursday Morning | W 5 - 15 |
| Thursday Afternoon | W 10 - 20 |
| Thursday Night | W 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Wednesday Morning | W 15 - 25 |
| Wednesday Afternoon | W 15 - 25 |
| Wednesday Night | W 20 - 30 |
| Thursday Morning | W 15 - 25 |
| Thursday Afternoon | W 10 - 20 |
| Thursday Night | W 10 - 20 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Wednesday Morning | W 15 - 25 |
| Wednesday Afternoon | W 20 - 30 |
| Wednesday Night | W 15 - 25 |
| Thursday Morning | W 15 - 25 |
| Thursday Afternoon | WSW 10 - 20 |
| Thursday Night | WSW 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Wednesday Morning | WSW 5 - 15 |
| Wednesday Afternoon | W 10 - 20 |
| Wednesday Night | W 5 - 15 |
| Thursday Morning | WSW 10 - 20 |
| Thursday Afternoon | WSW 15 - 25 |
| Thursday Night | WSW 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Wednesday Morning | W 10 - 20 |
| Wednesday Afternoon | W 10 - 20 |
| Wednesday Night | W 15 - 25 |
| Thursday Morning | W 5 - 15 |
| Thursday Afternoon | W 10 - 20 |
| Thursday Night | W 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Wednesday Morning | W 15 - 25 |
| Wednesday Afternoon | W 15 - 25 |
| Wednesday Night | W 20 - 30 |
| Thursday Morning | W 15 - 25 |
| Thursday Afternoon | W 10 - 20 |
| Thursday Night | W 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 | |
|---|---|---|---|---|---|
| Wednesday Morning | WNW 30 - 40 | WNW 25 - 35 | WNW 45 - 65 | --- - | NW 40 - 60 |
| Wednesday Afternoon | WNW 35 - 50 | WNW 30 - 40 | WNW 45 - 65 | --- - | WNW 40 - 60 |
| Wednesday Night | WNW 30 - 40 | WNW 20 - 30 | NW 40 - 60 | --- - | NW 40 - 60 |
| Thursday Morning | W 20 - 30 | W 20 - 30 | W 25 - 35 | --- - | WNW 25 - 35 |
| Thursday Afternoon | WSW 20 - 30 | W 25 - 35 | W 35 - 50 | --- - | WNW 25 - 35 |
| Thursday Night | W 25 - 35 | W 40 - 60 | W 40 - 60 | --- - | W 25 - 35 |
| Mt. Baker | Direction - Speed |
|---|---|
| Wednesday Morning | WNW 30 - 40 |
| Wednesday Afternoon | WNW 35 - 50 |
| Wednesday Night | WNW 30 - 40 |
| Thursday Morning | W 20 - 30 |
| Thursday Afternoon | WSW 20 - 30 |
| Thursday Night | W 25 - 35 |
| Washington Pass | Direction - Speed |
|---|---|
| Wednesday Morning | WNW 25 - 35 |
| Wednesday Afternoon | WNW 30 - 40 |
| Wednesday Night | WNW 20 - 30 |
| Thursday Morning | W 20 - 30 |
| Thursday Afternoon | W 25 - 35 |
| Thursday Night | W 40 - 60 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Wednesday Morning | WNW 45 - 65 |
| Wednesday Afternoon | WNW 45 - 65 |
| Wednesday Night | NW 40 - 60 |
| Thursday Morning | W 25 - 35 |
| Thursday Afternoon | W 35 - 50 |
| 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 | NW 40 - 60 |
| Wednesday Afternoon | WNW 40 - 60 |
| Wednesday Night | NW 40 - 60 |
| Thursday Morning | WNW 25 - 35 |
| Thursday Afternoon | WNW 25 - 35 |
| Thursday Night | W 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.
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Previous forecast from Mar 27, 2018
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