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Weather Synopsis for Friday & Sunday
An upper level ridge of high pressure extending from off the California coast through British Columbia and Alberta will amplify later today and tonight steering the storm track well to our north and leaving the PNW mountains mild and dry. High clouds extending from the frontal boundary well to our north should occasionally traverse the area over the next two days. Freezing levels will begin to climb in earnest today with peak warming occurring on Saturday. Easterly flow through the Cascade Passes and to a lesser extent down at Mt. Hood will produce locally cooler conditions with temperature inversions. We are not pulling arctic air over from Eastern Washington and Oregon, so inversions will not be as impressive as those seen earlier this month. Areas of low clouds and fog along the east slopes will be present over the next two days with little mixing at the surface. Crest level westerly winds for the Washington Cascades will be light to moderate today but increase on Saturday and Saturday night.
Weather Forecast
Olympics, Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Friday Afternoon - Saturday Night |
Mostly sunny days and clear nights with periods of high clouds. Warming trend. Locally cooler conditions Cascade Passes and sheltered valleys with periods of low clouds lower slopes. |
| Friday Morning |
Mostly sunny except cloudy at Cascade Pass level, clear higher terrain. |
East slopes of the Washington Cascades
| Friday - Saturday Night |
Mostly sunny days and clear nights with periods of high clouds. Low clouds and areas of fog lower east slopes. Warming trend above the inversion. |
Mt. Hood Area
| Friday - Saturday Night |
Mostly sunny days and clear nights with periods of high clouds. Warming trend. |
Issued: 8:38 AM PST Friday, January 27, 2017
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Friday Morning | Snow Level * | 4000' | 2500' | 1500' | ' | ' | 2500' | ' | 4000' |
| Friday Afternoon - Friday Night | Snow Level * | 6000' | 4500' | 4000' | ' | ' | 5500' | ' | 6500' |
| Saturday - Saturday Night | Snow Level * | 8500' | 7000' | 5500' | ' | ' | 8000' | ' | 9000' |
| Hurricane Ridge | Elevation |
|---|---|
| Friday Morning |
Snow Level 4000' (Easterly Flow *) |
| Friday Afternoon - Friday Night |
Snow Level 6000' (Easterly Flow *) |
| Saturday - Saturday Night |
Snow Level 8500' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Friday Morning |
Snow Level 2500' (Easterly Flow *) |
| Friday Afternoon - Friday Night |
Snow Level 4500' (Easterly Flow *) |
| Saturday - Saturday Night |
Snow Level 7000' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Friday Morning |
Snow Level 1500' (Easterly Flow *) |
| Friday Afternoon - Friday Night |
Snow Level 4000' (Easterly Flow *) |
| Saturday - Saturday Night |
Snow Level 5500' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Friday Morning |
Snow Level ' (Easterly Flow *) |
| Friday Afternoon - Friday Night |
Snow Level ' (Easterly Flow *) |
| Saturday - Saturday Night |
Snow Level ' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Friday Morning |
Snow Level ' (Easterly Flow *) |
| Friday Afternoon - Friday Night |
Snow Level ' (Easterly Flow *) |
| Saturday - Saturday Night |
Snow Level ' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Friday Morning |
Snow Level 2500' (Easterly Flow *) |
| Friday Afternoon - Friday Night |
Snow Level 5500' (Easterly Flow *) |
| Saturday - Saturday Night |
Snow Level 8000' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Friday Morning |
Snow Level ' (Easterly Flow *) |
| Friday Afternoon - Friday Night |
Snow Level ' (Easterly Flow *) |
| Saturday - Saturday Night |
Snow Level ' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Friday Morning |
Snow Level 4000' (Easterly Flow *) |
| Friday Afternoon - Friday Night |
Snow Level 6500' (Easterly Flow *) |
| Saturday - Saturday Night |
Snow Level 9000' (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 0.10 | LT 0.10 |
| Mt Baker Ski Area | LT 0.10 | LT 0.10 |
| Washington Pass | LT 0.10 | LT 0.10 |
| Stevens Pass | LT 0.10 | LT 0.10 |
| 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: 8:38 AM PST Friday, January 27, 2017
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Friday | SW 0 - 10 | SW 0 - 10 | SW 0 - 10 | --- - | S 0 - 10 |
| Friday Night - Saturday Morning | SW 5 - 15 | S 5 - 15 | SW 0 - 10 | --- - | VAR 0 - 10 |
| Saturday Afternoon - Saturday Night | SW 10 - 20 | SSW 10 - 20 | SW 0 - 10 | --- - | S 0 - 10 |
| Hurricane Ridge | Elevation |
|---|---|
| Friday | SW 0 - 10 |
| Friday Night - Saturday Morning | SW 5 - 15 |
| Saturday Afternoon - Saturday Night | SW 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Friday | SW 0 - 10 |
| Friday Night - Saturday Morning | S 5 - 15 |
| Saturday Afternoon - Saturday Night | SSW 10 - 20 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Friday | SW 0 - 10 |
| Friday Night - Saturday Morning | SW 0 - 10 |
| Saturday Afternoon - Saturday Night | SW 0 - 10 |
| Mt. Rainier | Elevation |
|---|---|
| Friday | --- - |
| Friday Night - Saturday Morning | --- - |
| Saturday Afternoon - Saturday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Friday | S 0 - 10 |
| Friday Night - Saturday Morning | VAR 0 - 10 |
| Saturday Afternoon - Saturday Night | S 0 - 10 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Friday | SW 0 - 10 |
| Friday Night - Saturday Morning | SW 5 - 15 |
| Saturday Afternoon - Saturday Night | SW 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Friday | SW 0 - 10 |
| Friday Night - Saturday Morning | S 5 - 15 |
| Saturday Afternoon - Saturday Night | SSW 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Friday | SW 0 - 10 |
| Friday Night - Saturday Morning | SW 0 - 10 |
| Saturday Afternoon - Saturday Night | SW 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Friday | --- - |
| Friday Night - Saturday Morning | --- - |
| Saturday Afternoon - Saturday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Friday | S 0 - 10 |
| Friday Night - Saturday Morning | VAR 0 - 10 |
| Saturday Afternoon - Saturday Night | S 0 - 10 |
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 | W 15 - 25 | W 15 - 25 | W 15 - 25 | --- - | W 10 - 20 |
| Friday Afternoon | W 20 - 30 | W 20 - 30 | W 15 - 25 | --- - | WNW 10 - 20 |
| Friday Night - Saturday Morning | W 25 - 35 | W 25 - 35 | W 20 - 30 | --- - | WNW 5 - 15 |
| Saturday Afternoon - Saturday Night | SW 25 - 40 | WSW 30 - 40 | SW 20 - 35 | --- - | SW 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Friday Morning | W 15 - 25 |
| Friday Afternoon | W 20 - 30 |
| Friday Night - Saturday Morning | W 25 - 35 |
| Saturday Afternoon - Saturday Night | SW 25 - 40 |
| Washington Pass | Direction - Speed |
|---|---|
| Friday Morning | W 15 - 25 |
| Friday Afternoon | W 20 - 30 |
| Friday Night - Saturday Morning | W 25 - 35 |
| Saturday Afternoon - Saturday Night | WSW 30 - 40 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Friday Morning | W 15 - 25 |
| Friday Afternoon | W 15 - 25 |
| Friday Night - Saturday Morning | W 20 - 30 |
| Saturday Afternoon - Saturday Night | SW 20 - 35 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Friday Morning | --- - |
| Friday Afternoon | --- - |
| Friday Night - Saturday Morning | --- - |
| Saturday Afternoon - Saturday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Friday Morning | W 10 - 20 |
| Friday Afternoon | WNW 10 - 20 |
| Friday Night - Saturday Morning | WNW 5 - 15 |
| Saturday Afternoon - Saturday Night | SW 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.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Previous forecast from Jan 27, 2017
The NWAC program is administered by the USDA-Forest Service and operates from the National Weather Service Forecast Office in Seattle. NWAC services are made possible by important collaboration and support from a wide variety of federal, state and private cooperators.
830 AM: Updated cloud forecast for Cascade Passes today.