Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Friday & Monday
Forecast delayed this morning due to website outage
Another impluse moving along the quasi-stationarty SW-NE oriented frontal boundary draped over the Olympics/north Cascades and extending into central British Columbia will again bring periods of light rain and snow to the aforementioned areas. Some filtered sunshine and sunbreaks should be seen further south for the first half of the day.
An upper level trough will finally kick the frontal boundary east tonight...with precipitation spreading inland later Friday afternoon and increasing overnight. Post frontal showers in cooler westerly flow and the upper trough passing through in the late morning should enhance showers along the west slopes. Snow levels should lower to around 4000 feet... and a Puget Sound convergence may show up by mid-day, primarily in the Stevens Pass and north vicinity. Weak upper level ridging will begin building offshore Saturday afternoon and shower intensity and coverage should generally diminish with a drying and partial clearing trend likely Saturday night.
Weather Forecast
Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Friday |
Cloudy with occasional light rain and snow north part, mostly cloudy with filtered sun and sun breaks central and south part. Increasing clouds in the afternoon with light rain and snow developing central and south Cascades by late afternoon or early evening. Mild. |
| Friday Night - Evening |
Light to occasionally moderate rain and snow becoming showers overnight. Slight cooling trend late Friday night. |
| Saturday Morning - Saturday Mid-day |
Mostly cloudy with light to moderate rain and snow showers. Cooler. Possible Puget sound convergence zone near and north of Stevens Pass. |
| Saturday Night |
Partly cloudy. |
Olympics
| Friday |
Cloudy with occasional light rain and snow. Mild. |
| Friday Night - Evening |
Light to occasionally moderate rain and snow becoming showers overnight. Slight cooling trend Friday night. |
| Saturday Morning - Saturday Mid-day |
Mostly cloudy with light to occasionally moderate rain and snow showers. Cooler. |
| Saturday Night |
Partly cloudy. |
| Saturday Evening |
Mostly cloudy with scattered light rain and snow showers. |
| Saturday Afternoon |
Mostly cloudy with isolated light rain and snow showers. |
East slopes of the Washington Cascades
| Friday |
Cloudy with occasional light rain and snow north part, mostly cloudy with filtered sun and sun breaks central and south part. Increasing clouds in the afternoon with light rain and snow developing central and south Cascades by late afternoon or early evening. Mild. |
| Friday Night - Evening |
Light to occasionally moderate rain and snow becoming showers overnight. Slight cooling trend late Friday night. |
| Saturday Morning - Saturday Mid-day |
Mostly cloudy with light rain and snow showers, heaviest near the Cascade crest. Cooler. |
| Saturday Night |
Mostly clear. |
| Saturday Afternoon |
Partly cloudy with isolated light rain and snow showers. |
Mt. Hood Area
| Friday |
Mostly cloudy with filtered sun and sun breaks. Increasing clouds in the afternoon. Mild. |
| Friday Night - Evening |
Light rain and snow developing in the evening and becoming light showers overnight. Slight cooling trend late Friday night. |
| Saturday Morning - Saturday Mid-day |
Mostly cloudy with light rain and snow showers. Cooler. |
| Saturday Night |
Partly cloudy. |
| Saturday Afternoon |
Partly cloudy with isolated light rain and snow showers. |
Issued: 9:00 AM PDT Friday, March 20, 2015
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Friday - Friday Evening | Snow Level | 6500' | 6000' | 6000' | ' | ' | 6500' | ' | 7000' |
| Friday Night | Snow Level | 4500' | 5000' | 5500' | ' | ' | 5000' | ' | 5000' |
| Saturday | Snow Level | 4000' | 4000' | 4500' | ' | ' | 4000' | ' | 5000' |
| Saturday Night | Freezing Level | 4500' | 4000' | 3000' | ' | ' | 4500' | ' | 6000' |
| Hurricane Ridge | Elevation |
|---|---|
| Friday - Friday Evening |
Snow Level 6500' |
| Friday Night |
Snow Level 4500' |
| Saturday |
Snow Level 4000' |
| Saturday Night |
Freezing Level 4500' |
| Mt. Baker | Elevation |
|---|---|
| Friday - Friday Evening |
Snow Level 6000' |
| Friday Night |
Snow Level 5000' |
| Saturday |
Snow Level 4000' |
| Saturday Night |
Freezing Level 4000' |
| Washington Pass | Elevation |
|---|---|
| Friday - Friday Evening |
Snow Level 6000' |
| Friday Night |
Snow Level 5500' |
| Saturday |
Snow Level 4500' |
| Saturday Night |
Freezing Level 3000' |
| Leavenworth | Elevation |
|---|---|
| Friday - Friday Evening |
Snow Level ' |
| Friday Night |
Snow Level ' |
| Saturday |
Snow Level ' |
| Saturday Night |
Freezing Level ' |
| Stevens Pass | Elevation |
|---|---|
| Friday - Friday Evening |
Snow Level ' |
| Friday Night |
Snow Level ' |
| Saturday |
Snow Level ' |
| Saturday Night |
Freezing Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Friday - Friday Evening |
Snow Level 6500' |
| Friday Night |
Snow Level 5000' |
| Saturday |
Snow Level 4000' |
| Saturday Night |
Freezing Level 4500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Friday - Friday Evening |
Snow Level ' |
| Friday Night |
Snow Level ' |
| Saturday |
Snow Level ' |
| Saturday Night |
Freezing Level ' |
| Mt. Hood | Elevation |
|---|---|
| Friday - Friday Evening |
Snow Level 7000' |
| Friday Night |
Snow Level 5000' |
| Saturday |
Snow Level 5000' |
| Saturday Night |
Freezing 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
| Monday | Monday | |
|---|---|---|
| Hurricane Ridge | 0 - 0.50 | LT 0.10 |
| Mt Baker Ski Area | 0 - 1.50 | 0 - 0.50 |
| Washington Pass | 0.25 - 0.50 | LT 0.25 |
| Stevens Pass | 0.25 - 0.50 | 0.25 - 0.50 |
| Snoqualmie Pass | 0 - 0.50 | 0.25 - 0.50 |
| Mission Ridge | LT 0.25 | LT 0.25 |
| Crystal Mt | 0.25 - 0.50 | 0.25 - 0.50 |
| Paradise | 0.75 - 1.00 | 0 - 0.50 |
| White Pass | 0.25 - 0.50 | 0.25 - 0.50 |
| Mt Hood Meadows | LT 0.25 | LT 0.10 |
| Timberline | 0.25 - 0.50 | LT 0.25 |
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: 9:00 AM PDT Friday, March 20, 2015
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Friday Morning | SW 15 - 25 | S 20 - 30 | SSW 15 - 25 | --- - | SW 15 - 25 |
| Friday Afternoon | SW 20 - 30 | S 20 - 30 | SSW 20 - 30 | --- - | SW 15 - 25 |
| Friday Night - Saturday Morning | WSW 10 - 20 | SSW 15 - 25 | SW 25 - 35 | --- - | SW 30 - 40 |
| Saturday Afternoon | SW 5 - 15 | WSW 5 - 15 | SW 10 - 20 | --- - | SW 5 - 15 |
| Saturday Night | S 5 - 15 | S 0 - 10 | S 0 - 10 | --- - | SW 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Friday Morning | SW 15 - 25 |
| Friday Afternoon | SW 20 - 30 |
| Friday Night - Saturday Morning | WSW 10 - 20 |
| Saturday Afternoon | SW 5 - 15 |
| Saturday Night | S 5 - 15 |
| Mt. Baker | Elevation |
|---|---|
| Friday Morning | S 20 - 30 |
| Friday Afternoon | S 20 - 30 |
| Friday Night - Saturday Morning | SSW 15 - 25 |
| Saturday Afternoon | WSW 5 - 15 |
| Saturday Night | S 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Friday Morning | SSW 15 - 25 |
| Friday Afternoon | SSW 20 - 30 |
| Friday Night - Saturday Morning | SW 25 - 35 |
| Saturday Afternoon | SW 10 - 20 |
| Saturday Night | S 0 - 10 |
| Mt. Rainier | Elevation |
|---|---|
| Friday Morning | --- - |
| Friday Afternoon | --- - |
| Friday Night - Saturday Morning | --- - |
| Saturday Afternoon | --- - |
| Saturday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Friday Morning | SW 15 - 25 |
| Friday Afternoon | SW 15 - 25 |
| Friday Night - Saturday Morning | SW 30 - 40 |
| Saturday Afternoon | SW 5 - 15 |
| Saturday Night | SW 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Friday Morning | SW 15 - 25 |
| Friday Afternoon | SW 20 - 30 |
| Friday Night - Saturday Morning | WSW 10 - 20 |
| Saturday Afternoon | SW 5 - 15 |
| Saturday Night | S 5 - 15 |
| Mt. Baker | Direction - Speed |
|---|---|
| Friday Morning | S 20 - 30 |
| Friday Afternoon | S 20 - 30 |
| Friday Night - Saturday Morning | SSW 15 - 25 |
| Saturday Afternoon | WSW 5 - 15 |
| Saturday Night | S 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Friday Morning | SSW 15 - 25 |
| Friday Afternoon | SSW 20 - 30 |
| Friday Night - Saturday Morning | SW 25 - 35 |
| Saturday Afternoon | SW 10 - 20 |
| Saturday Night | S 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Friday Morning | --- - |
| Friday Afternoon | --- - |
| Friday Night - Saturday Morning | --- - |
| Saturday Afternoon | --- - |
| Saturday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Friday Morning | SW 15 - 25 |
| Friday Afternoon | SW 15 - 25 |
| Friday Night - Saturday Morning | SW 30 - 40 |
| Saturday Afternoon | SW 5 - 15 |
| Saturday Night | SW 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 | |
|---|---|---|---|---|---|
| Friday Morning | SW 35 - 45 | SW 30 - 40 | SW 25 - 35 | --- - | SW 25 - 35 |
| Friday Afternoon | SW 35 - 45 | SW 25 - 35 | SW 40 - 50 | --- - | SW 45 - 55 |
| Friday Night - Saturday Morning | SW 20 - 30 | SW 25 - 35 | WSW 30 - 40 | --- - | SW 40 - 50 |
| Saturday Afternoon | W 20 - 30 | W 30 - 40 | W 20 - 30 | --- - | WSW 20 - 30 |
| Saturday Night | WSW 10 - 20 | W 10 - 20 | WSW 15 - 25 | --- - | SW 20 - 30 |
| Mt. Baker | Direction - Speed |
|---|---|
| Friday Morning | SW 35 - 45 |
| Friday Afternoon | SW 35 - 45 |
| Friday Night - Saturday Morning | SW 20 - 30 |
| Saturday Afternoon | W 20 - 30 |
| Saturday Night | WSW 10 - 20 |
| Washington Pass | Direction - Speed |
|---|---|
| Friday Morning | SW 30 - 40 |
| Friday Afternoon | SW 25 - 35 |
| Friday Night - Saturday Morning | SW 25 - 35 |
| Saturday Afternoon | W 30 - 40 |
| Saturday Night | W 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Friday Morning | SW 25 - 35 |
| Friday Afternoon | SW 40 - 50 |
| Friday Night - Saturday Morning | WSW 30 - 40 |
| Saturday Afternoon | W 20 - 30 |
| Saturday Night | WSW 15 - 25 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Friday Morning | --- - |
| Friday Afternoon | --- - |
| Friday Night - Saturday Morning | --- - |
| Saturday Afternoon | --- - |
| Saturday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Friday Morning | SW 25 - 35 |
| Friday Afternoon | SW 45 - 55 |
| Friday Night - Saturday Morning | SW 40 - 50 |
| Saturday Afternoon | WSW 20 - 30 |
| Saturday Night | SW 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.
Issued: 9:00 AM PDT Friday, March 20, 2015
Extended Weather Synopsis for Monday night through Monday
The next frontal system should split as it approaches... and looks likely to make it's way to to the coast by mid-day with light precipitation beginning for the Cascades perhaps by Sunday afternoon with the front passing through Sunday night.
Cool upper level troughing in W-NW flow aloft should be in place Monday and Tuesday with the coldest air aloft seen in quite sometime. Since it's spring... this should help lead to generally unstable conditions, peaking in the afternoon and translating to a broad-brush of scattered light to occasionally moderate showers with snow levels down to 3000-4000 feet.
Extended Weather
Olympics, Washington Cascades and Mt. Hood area
Partly cloudy.
Increasing clouds with light rain and snow developing Olympics and spreading inland late afternoon.
Light rain and snow.
Mostly cloudy with scattered light to moderate rain and snow showers. Cooler.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Sunday Morning | Freezing Level | 3500' - 4500' | 4000' - 5000' | 5000' - 6000' | |
| Sunday Afternoon - Sunday Night | Snow Level | 4000' - 5000' | 4500' - 5500' | 4500' - 5500' | |
| Monday - Tuesday | Snow Level | 3000' - 4000' | 3000' - 4000' | 3000' - 4000' |
| Mt. Baker | Elevation |
|---|---|
| Sunday Morning |
Freezing Level 3500' - 4500' |
| Sunday Afternoon - Sunday Night |
Snow Level 4000' - 5000' |
| Monday - Tuesday |
Snow Level 3000' - 4000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Morning |
Freezing Level 4000' - 5000' |
| Sunday Afternoon - Sunday Night |
Snow Level 4500' - 5500' |
| Monday - Tuesday |
Snow Level 3000' - 4000' |
| Mt. Hood | Elevation |
|---|---|
| Sunday Morning |
Freezing Level 5000' - 6000' |
| Sunday Afternoon - Sunday Night |
Snow Level 4500' - 5500' |
| Monday - Tuesday |
Snow Level 3000' - 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.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Previous forecast from Mar 19, 2015
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