Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Wednesday & Sunday
Afternoon update: Day 2 precipitation amounts have revised downward.
A weak upper level shortwave passed through yesterday, knocking down freezing levels a bit and producing some light showers overnight. A weak weather system in NW flow aloft will work it's way over the PNW this afternoon and tonight. Clouds should increase today, along with some light rain and snow developing first for the Olympics and north Cascades in the afternoon and spreading south overnight. Precipitation totals look light with this system with snow levels mainly in the 3500-4500 ft range. Scattered showers will continue Wednesday night in light westerly flow.
The stacked low pressure system will dive south Thursday night... and this now looks like it should deliver only a moderate shot of precipitation to the Mt. Hood area, with lighter amounts further north. There may be some light upslope showers along the north slopes of the Olympics Thursday night as winds become northeasterly.
Weather Forecast
Olympics, Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Wednesday Afternoon |
Cloudy with periods of light rain and snow. |
| Wednesday Night |
Cloudy with occasional light rain and snow. |
| Thursday |
Cloudy with light rain and snow showers. |
| Thursday Night |
Cloudy with light rain and snow, possibly moderate south Washington Cascades and north slopes of the Olympics. |
East slopes of the Washington Cascades
| Wednesday Afternoon |
Cloudy with light rain and snow developing northeast Cascades and Olympics and spreading south late in the afternoon. |
| Wednesday Night |
Cloudy with occasional light rain and snow. |
| Thursday |
Mostly cloudy with occasional light rain and snow showers. |
| Thursday Night |
Cloudy with periods of light rain and snow. |
Mt. Hood Area
| Wednesday |
Partly to mostly cloudy with a chance of light rain or snow. |
| Wednesday Night |
Cloudy with light rain and snow. |
| Thursday |
Cloudy with light rain and snow showers. |
| Thursday Night |
Light to occasionally moderate rain and snow. |
Issued: 2:08 PM PST Wednesday, February 25, 2015
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Wednesday Afternoon - Thursday Morning | Snow Level | 4500' | 4000' | 4000' | ' | ' | 4000' | ' | 4500' |
| Thursday Mid-day - Thursday Afternoon | Snow Level | 4500' | 4000' | 4000' | ' | ' | 4500' | ' | 5000' |
| Thursday Night | Snow Level * | 3500' | 3000' | 2500' | ' | ' | 3500' | ' | 4500' |
| Hurricane Ridge | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning |
Snow Level 4500' |
| Thursday Mid-day - Thursday Afternoon |
Snow Level 4500' |
| Thursday Night |
Snow Level 3500' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning |
Snow Level 4000' |
| Thursday Mid-day - Thursday Afternoon |
Snow Level 4000' |
| Thursday Night |
Snow Level 3000' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning |
Snow Level 4000' |
| Thursday Mid-day - Thursday Afternoon |
Snow Level 4000' |
| Thursday Night |
Snow Level 2500' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning |
Snow Level ' |
| Thursday Mid-day - Thursday Afternoon |
Snow Level ' |
| Thursday Night |
Snow Level ' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning |
Snow Level ' |
| Thursday Mid-day - Thursday Afternoon |
Snow Level ' |
| Thursday Night |
Snow Level ' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning |
Snow Level 4000' |
| Thursday Mid-day - Thursday Afternoon |
Snow Level 4500' |
| Thursday Night |
Snow Level 3500' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning |
Snow Level ' |
| Thursday Mid-day - Thursday Afternoon |
Snow Level ' |
| Thursday Night |
Snow Level ' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning |
Snow Level 4500' |
| Thursday Mid-day - Thursday Afternoon |
Snow Level 5000' |
| Thursday Night |
Snow Level 4500' (Easterly Flow *) |
* 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
| Sunday | Sunday | |
|---|---|---|
| Hurricane Ridge | LT 0.25 | LT 0.25 |
| Mt Baker Ski Area | 0.25 - 0.50 | LT 0.25 |
| Washington Pass | LT 0.25 | LT 0.10 |
| Stevens Pass | 0.25 - 0.50 | LT 0.25 |
| Snoqualmie Pass | 0.25 - 0.50 | LT 0.25 |
| Mission Ridge | LT 0.10 | LT 0.25 |
| Crystal Mt | LT 0.10 | LT 0.25 |
| Paradise | LT 0.25 | 0.25 - 0.50 |
| White Pass | LT 0.10 | LT 0.25 |
| Mt Hood Meadows | LT 0.25 | 0.50 - 0.75 |
| Timberline | LT 0.25 | 0 - 0.75 |
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: 2:08 PM PST Wednesday, February 25, 2015
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Wednesday Afternoon - Thursday Morning | NW 0 - 10 | W 0 - 10 | WNW 5 - 15 | --- - | NW 10 - 20 |
| Thursday Afternoon | SW 0 - 10 | W 0 - 10 | W 0 - 10 | --- - | W 5 - 15 |
| Thursday Night | NE 5 - 15 | NE 5 - 15 | E 5 - 15 | --- - | W 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning | NW 0 - 10 |
| Thursday Afternoon | SW 0 - 10 |
| Thursday Night | NE 5 - 15 |
| Mt. Baker | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning | W 0 - 10 |
| Thursday Afternoon | W 0 - 10 |
| Thursday Night | NE 5 - 15 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning | WNW 5 - 15 |
| Thursday Afternoon | W 0 - 10 |
| Thursday Night | E 5 - 15 |
| Mt. Rainier | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Wednesday Afternoon - Thursday Morning | NW 10 - 20 |
| Thursday Afternoon | W 5 - 15 |
| Thursday Night | W 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Wednesday Afternoon - Thursday Morning | NW 0 - 10 |
| Thursday Afternoon | SW 0 - 10 |
| Thursday Night | NE 5 - 15 |
| Mt. Baker | Direction - Speed |
|---|---|
| Wednesday Afternoon - Thursday Morning | W 0 - 10 |
| Thursday Afternoon | W 0 - 10 |
| Thursday Night | NE 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Wednesday Afternoon - Thursday Morning | WNW 5 - 15 |
| Thursday Afternoon | W 0 - 10 |
| Thursday Night | E 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Wednesday Afternoon - Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Wednesday Afternoon - Thursday Morning | NW 10 - 20 |
| Thursday Afternoon | W 5 - 15 |
| Thursday Night | W 5 - 15 |
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 Afternoon - Thursday Morning | W 5 - 15 | NW 5 - 15 | NW 15 - 30 | --- - | NW 25 - 35 |
| Thursday Afternoon | W 5 - 15 | WNW 0 - 10 | WNW 10 - 20 | --- - | NW 15 - 25 |
| Thursday Night | NE 5 - 15 | NE 5 - 15 | W 0 - 10 | --- - | W 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Wednesday Afternoon - Thursday Morning | W 5 - 15 |
| Thursday Afternoon | W 5 - 15 |
| Thursday Night | NE 5 - 15 |
| Washington Pass | Direction - Speed |
|---|---|
| Wednesday Afternoon - Thursday Morning | NW 5 - 15 |
| Thursday Afternoon | WNW 0 - 10 |
| Thursday Night | NE 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Wednesday Afternoon - Thursday Morning | NW 15 - 30 |
| Thursday Afternoon | WNW 10 - 20 |
| Thursday Night | W 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Wednesday Afternoon - Thursday Morning | --- - |
| Thursday Afternoon | --- - |
| Thursday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Wednesday Afternoon - Thursday Morning | NW 25 - 35 |
| Thursday Afternoon | NW 15 - 25 |
| Thursday 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.
Issued: 2:08 PM PST Wednesday, February 25, 2015
Extended Weather Synopsis for Sunday night through Sunday
As the upper low settles over central Oregon Friday, the air mass should be relatively unstable with cold air aloft and day time heating keeping showers in the forecast. The heaviest showers and accumulations will likely be closest to the low... again for the south Washington Cascades and Mt. Hood area.
As the low digs over the Great Basin Friday night... the flow will veer to NE and help usher in a quick but cold shot of air from the interior. E-NE winds should also increase Friday night through Saturday. Although a drying trend should quickly ensue Saturday... temperatures and winds should keep it feeling wintry. The upper ridge axis will rebuild offshore around 140W over the weekend... and freezing levels should moderate on Sunday and E-NE winds should ease.
Extended Weather
East slopes of the Washington Cascades
Mostly cloudy with light rain and snow showers, showers may occasionally be moderate in the afternoon and evening.
Becoming mostly sunny. Breezy and cooler.
Mostly clear.
Olympics, Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes and Mt. Hood Area
Mostly cloudy with light to occasionally moderate rain and snow showers south Washington Cascade and Mt. Hood, partly cloudy with scattered light showers central, north Cascades and Olympics.
Becoming mostly sunny. Breezy and cooler.
Mostly clear.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Friday | Snow Level | 3000' - 4000' | 3500' - 4500' | 3500' - 4500' | * |
| Friday Night - Saturday Morning | Snow Level | 1000' - 2000' | 2000' - 3000' | 2500' - 3500' | * |
| Saturday Afternoon | Freezing Level | 3000' - 4000' | 3000' - 4000' | 2500' - 3500' | |
| Sunday | Freezing Level | 3500' - 4500' | 4000' - 5000' | 4500' - 5500' |
| Mt. Baker | Elevation |
|---|---|
| Friday |
Snow Level 3000' - 4000' (Easterly Flow *) |
| Friday Night - Saturday Morning |
Snow Level 1000' - 2000' (Easterly Flow *) |
| Saturday Afternoon |
Freezing Level 3000' - 4000' |
| Sunday |
Freezing Level 3500' - 4500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Friday |
Snow Level 3500' - 4500' (Easterly Flow *) |
| Friday Night - Saturday Morning |
Snow Level 2000' - 3000' (Easterly Flow *) |
| Saturday Afternoon |
Freezing Level 3000' - 4000' |
| Sunday |
Freezing Level 4000' - 5000' |
| Mt. Hood | Elevation |
|---|---|
| Friday |
Snow Level 3500' - 4500' (Easterly Flow *) |
| Friday Night - Saturday Morning |
Snow Level 2500' - 3500' (Easterly Flow *) |
| Saturday Afternoon |
Freezing Level 2500' - 3500' |
| Sunday |
Freezing Level 4500' - 5500' |
* 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 25, 2015
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