Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Saturday & Monday
A fast moving frontal system passed through the Olympics and Cascades early Saturday morning, drastically lowering snow levels and generally producing with 1-3 inches of new snow, with locally up to 6-8 inches in the Mt. Baker area in it's wake. Little to no new snow was received at Mt. Hood and along the east slopes of the Cascades. Scattered showers mainly along the west slopes of the Cascades and Olympics this afternoon will quickly taper overnight. Showers may still occasionally be moderate in the remnants of a convergence zone near and west of the Stevens Pass area. Breezy west winds will also ease overnight.
A dry upper level trough will spread high clouds over the area tonight. The trough will swing through the Cascades by late morning, with a general clearing and slight warming trend expected for all areas. The trough will linger longest over the north Cascades with locally more afternoon cloud cover and a slight chance of an afternoon shower possible. Freezing levels will climb to 6000-7000 ft Sunday afternoon.
Upper level ridging building offshore will shift nearer to the coast Sunday night with clear skies expected.
Weather Forecast
Olympics
| Saturday | Mostly cloudy with afternoon sunbreaks. Isolated light rain and snow showers. Cool. |
| Saturday Night | Mostly cloudy with isolated showers tapering off in the evening. Partly to mostly cloudy with periods of high clouds after midnight. |
| Sunday | Partly cloudy with periods of high clouds in the morning, becoming partly to mostly sunny late morning and afternoon with cumulus clouds building. Gradual warming trend. |
| Sunday Night | Mostly clear. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Saturday | Mostly cloudy with afternoon sunbreaks. Scattered light rain and snow showers, occasionally moderate near and west of Stevens Pass area. Cool. |
| Saturday Night | Mostly cloudy with isolated showers tapering off in the evening. Partly to mostly cloudy with periods of high clouds after midnight. |
| Sunday | Partly cloudy with periods of high clouds in the morning, becoming partly to mostly sunny late morning and afternoon with cumulus clouds building. More afternoon clouds north Cascades. Gradual warming trend. |
| Sunday Night | Mostly clear. |
East Slopes of the Washington Cascades
| Saturday | Partly to mostly cloudy with scattered light rain and snow showers near the Cascade crest. Cool. |
| Saturday Night | Partly to mostly cloudy with periods of high clouds. |
| Sunday | Partly cloudy with periods of high clouds in the morning, becoming mostly sunny late morning and afternoon with cumulus clouds building. More afternoon clouds northeast Cascades. Gradual warming trend. |
| Sunday Night | Mostly clear. |
Mt. Hood
| Saturday | Partly to mostly sunny. |
| Saturday Night | Partly cloudy with periods of high clouds. |
| Sunday | Partly cloudy with periods of high clouds in the morning, becoming mostly sunny late morning and afternoon with cumulus clouds building. Gradual warming trend. |
| Sunday Night | Mostly clear. |
Issued: 2:45 PM PDT Saturday, April 21, 2018
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Saturday Afternoon | Snow Level | 3500' | 3500' | 4000' | ' | ' | 3500' | ' | 5000' |
| Saturday Night | Snow Level | 2500' | 2500' | 2000' | ' | ' | 2500' | ' | 3000' |
| Sunday Morning | Freezing Level | 3500' | 3500' | 3500' | ' | ' | 3500' | ' | 4500' |
| Sunday Afternoon | Freezing Level | 6000' | 6000' | 6500' | ' | ' | 6000' | ' | 7000' |
| Sunday Night | Freezing Level | 6500' | 6000' | 4500' | ' | ' | 6000' | ' | 7000' |
| Hurricane Ridge | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level 3500' |
| Saturday Night |
Snow Level 2500' |
| Sunday Morning |
Freezing Level 3500' |
| Sunday Afternoon |
Freezing Level 6000' |
| Sunday Night |
Freezing Level 6500' |
| Mt. Baker | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level 3500' |
| Saturday Night |
Snow Level 2500' |
| Sunday Morning |
Freezing Level 3500' |
| Sunday Afternoon |
Freezing Level 6000' |
| Sunday Night |
Freezing Level 6000' |
| Washington Pass | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level 4000' |
| Saturday Night |
Snow Level 2000' |
| Sunday Morning |
Freezing Level 3500' |
| Sunday Afternoon |
Freezing Level 6500' |
| Sunday Night |
Freezing Level 4500' |
| Leavenworth | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level ' |
| Saturday Night |
Snow Level ' |
| Sunday Morning |
Freezing Level ' |
| Sunday Afternoon |
Freezing Level ' |
| Sunday Night |
Freezing Level ' |
| Stevens Pass | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level ' |
| Saturday Night |
Snow Level ' |
| Sunday Morning |
Freezing Level ' |
| Sunday Afternoon |
Freezing Level ' |
| Sunday Night |
Freezing Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level 3500' |
| Saturday Night |
Snow Level 2500' |
| Sunday Morning |
Freezing Level 3500' |
| Sunday Afternoon |
Freezing Level 6000' |
| Sunday Night |
Freezing Level 6000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level ' |
| Saturday Night |
Snow Level ' |
| Sunday Morning |
Freezing Level ' |
| Sunday Afternoon |
Freezing Level ' |
| Sunday Night |
Freezing Level ' |
| Mt. Hood | Elevation |
|---|---|
| Saturday Afternoon |
Snow Level 5000' |
| Saturday Night |
Snow Level 3000' |
| Sunday Morning |
Freezing Level 4500' |
| Sunday Afternoon |
Freezing Level 7000' |
| Sunday Night |
Freezing Level 7000' |
* 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 | LT 0.10 | LT 0.10 |
| Mt Baker Ski Area | 0.25 - 0.50 | LT 0.10 |
| Washington Pass | LT 0.25 | LT 0.10 |
| Stevens Pass | 0.25 - 0.50 | LT 0.10 |
| Snoqualmie Pass | LT 0.25 | LT 0.10 |
| Mission Ridge | LT 0.10 | LT 0.10 |
| Crystal Mt | LT 0.10 | LT 0.10 |
| Paradise | LT 0.25 | LT 0.10 |
| White Pass | LT 0.25 | 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: 2:45 PM PDT Saturday, April 21, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Saturday Afternoon | W 5 - 15 | WSW 10 - 20 | W 15 - 25 | --- - | W 15 - 25 |
| Saturday Night | NW 0 - 10 | NW 0 - 10 | NW 5 - 15 | --- - | WNW 5 - 15 |
| Sunday Morning | N 0 - 10 | N 0 - 10 | NW 0 - 10 | --- - | NW 0 - 10 |
| Sunday Afternoon | N 5 - 15 | NW 5 - 15 | NW 5 - 15 | --- - | NW 5 - 15 |
| Sunday Night | NE 0 - 10 | E 0 - 10 | E 0 - 10 | --- - | E 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Saturday Afternoon | W 5 - 15 |
| Saturday Night | NW 0 - 10 |
| Sunday Morning | N 0 - 10 |
| Sunday Afternoon | N 5 - 15 |
| Sunday Night | NE 0 - 10 |
| Mt. Baker | Elevation |
|---|---|
| Saturday Afternoon | WSW 10 - 20 |
| Saturday Night | NW 0 - 10 |
| Sunday Morning | N 0 - 10 |
| Sunday Afternoon | NW 5 - 15 |
| Sunday Night | E 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Saturday Afternoon | W 15 - 25 |
| Saturday Night | NW 5 - 15 |
| Sunday Morning | NW 0 - 10 |
| Sunday Afternoon | NW 5 - 15 |
| Sunday Night | E 0 - 10 |
| Mt. Rainier | Elevation |
|---|---|
| Saturday Afternoon | --- - |
| Saturday Night | --- - |
| Sunday Morning | --- - |
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Saturday Afternoon | W 15 - 25 |
| Saturday Night | WNW 5 - 15 |
| Sunday Morning | NW 0 - 10 |
| Sunday Afternoon | NW 5 - 15 |
| Sunday Night | E 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Saturday Afternoon | W 5 - 15 |
| Saturday Night | NW 0 - 10 |
| Sunday Morning | N 0 - 10 |
| Sunday Afternoon | N 5 - 15 |
| Sunday Night | NE 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Saturday Afternoon | WSW 10 - 20 |
| Saturday Night | NW 0 - 10 |
| Sunday Morning | N 0 - 10 |
| Sunday Afternoon | NW 5 - 15 |
| Sunday Night | E 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Saturday Afternoon | W 15 - 25 |
| Saturday Night | NW 5 - 15 |
| Sunday Morning | NW 0 - 10 |
| Sunday Afternoon | NW 5 - 15 |
| Sunday Night | E 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Saturday Afternoon | --- - |
| Saturday Night | --- - |
| Sunday Morning | --- - |
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Saturday Afternoon | W 15 - 25 |
| Saturday Night | WNW 5 - 15 |
| Sunday Morning | NW 0 - 10 |
| Sunday Afternoon | NW 5 - 15 |
| Sunday Night | E 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 | |
|---|---|---|---|---|---|
| Saturday Afternoon | W 20 - 30 | W 25 - 35 | W 25 - 35 | --- - | W 15 - 25 |
| Saturday Night | NW 5 - 15 | NW 5 - 15 | WNW 10 - 20 | --- - | SW 10 - 20 |
| Sunday Morning | NW 0 - 10 | N 0 - 10 | NW 5 - 15 | --- - | WNW 5 - 15 |
| Sunday Afternoon | N 0 - 10 | N 0 - 10 | NW 5 - 15 | --- - | NW 5 - 15 |
| Sunday Night | NNE 5 - 15 | N 5 - 15 | NNE 5 - 15 | --- - | N 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Saturday Afternoon | W 20 - 30 |
| Saturday Night | NW 5 - 15 |
| Sunday Morning | NW 0 - 10 |
| Sunday Afternoon | N 0 - 10 |
| Sunday Night | NNE 5 - 15 |
| Washington Pass | Direction - Speed |
|---|---|
| Saturday Afternoon | W 25 - 35 |
| Saturday Night | NW 5 - 15 |
| Sunday Morning | N 0 - 10 |
| Sunday Afternoon | N 0 - 10 |
| Sunday Night | N 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Saturday Afternoon | W 25 - 35 |
| Saturday Night | WNW 10 - 20 |
| Sunday Morning | NW 5 - 15 |
| Sunday Afternoon | NW 5 - 15 |
| Sunday Night | NNE 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Saturday Afternoon | --- - |
| Saturday Night | --- - |
| Sunday Morning | --- - |
| Sunday Afternoon | --- - |
| Sunday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Saturday Afternoon | W 15 - 25 |
| Saturday Night | SW 10 - 20 |
| Sunday Morning | WNW 5 - 15 |
| Sunday Afternoon | NW 5 - 15 |
| Sunday Night | N 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.
Issued: 2:45 PM PDT Saturday, April 21, 2018
Extended Weather Synopsis for Monday night through Monday
A strong upper level ridge of high pressure will build over the western US and Canada Monday, and gradually shift inland during the week. A cut-off, broad, but weak upper level low will meander towards the California coast mid-week.
This will leave our region in a dry and warm air mass. A progressive warming trend is expected Monday through Wednesday with the warm weather extending through the end of the work week. The warmest temperatures of the season will occur this week with generally clear skies. Caveats to the dry and warm weather include a period of offshore flow on Monday, strongest from Snoqualmie Pass to Mt. Hood. The flow at Cascade crest level and above will shift to a south wind as the cut-off upper low drifts closer and offshore gradients weaken.
Extended Weather
Olympics, Washington Cascades and Mt. Hood Area
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Monday | Freezing Level | 7500' - 8500' | 8500' - 9500' | 9500' - 10500' | * |
| Monday Night | Freezing Level | 8500' - 9500' | 9500' - 10500' | 10500' - 11000' | * |
| Tuesday | Freezing Level | 9500' - 10500' | 10500' - 11500' | 11000' - 12000' | |
| Tuesday Night | Freezing Level | 9500' - 10500' | 10500' - 11500' | 11000' - 12000' | |
| Wednesday | Freezing Level | 11000' - 12000' | 11000' - 12000' | 11000' - 12000' |
| Mt. Baker | Elevation |
|---|---|
| Monday |
Freezing Level 7500' - 8500' (Easterly Flow *) |
| Monday Night |
Freezing Level 8500' - 9500' (Easterly Flow *) |
| Tuesday |
Freezing Level 9500' - 10500' |
| Tuesday Night |
Freezing Level 9500' - 10500' |
| Wednesday |
Freezing Level 11000' - 12000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday |
Freezing Level 8500' - 9500' (Easterly Flow *) |
| Monday Night |
Freezing Level 9500' - 10500' (Easterly Flow *) |
| Tuesday |
Freezing Level 10500' - 11500' |
| Tuesday Night |
Freezing Level 10500' - 11500' |
| Wednesday |
Freezing Level 11000' - 12000' |
| Mt. Hood | Elevation |
|---|---|
| Monday |
Freezing Level 9500' - 10500' (Easterly Flow *) |
| Monday Night |
Freezing Level 10500' - 11000' (Easterly Flow *) |
| Tuesday |
Freezing Level 11000' - 12000' |
| Tuesday Night |
Freezing Level 11000' - 12000' |
| Wednesday |
Freezing Level 11000' - 12000' |
* 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 Apr 20, 2018
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.