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 night through Monday
Our atmospheric river event is nearly over as the frontal boundary draped over the Puget Sound continues to weaken as it pushes into the Cascades. After a relatively quiet Fall weather-wise, this event tallied 3-7 inches of water over the last 72 hours for mountain weather stations in the Olympics, Cascade Passes and along the west slopes of the Cascades.
Light rain and snow should peter out on the backside of the front as the air mass over the region continues to slowly cool. A shortwave trough will rotate up from northern California later tonight and Sunday. Light rain and snow should affect Mt. Hood tonight and spread to the south Washington Cascades Sunday morning. It's unclear how far north light precipitation will spread on Sunday, but at the very least it should spread a mid to high overcast over much of the region.
As the trough exits to our east Sunday night, a dirty upper level ridge will build over the area. Light onshore westerly flow should help trap moisture under the ridge and along the west slopes of the Cascades and Mt. Hood below Cascade crest level, perhaps squeezing out a few bouts of light snow. A better chance for sunshine should be found along the east slope of the Cascades on Monday.
Weather Forecast
Hurricane Ridge
| Saturday Night | Becoming mostly cloudy with a slight chance of rain or snow showers. |
| Sunday | Partly sunny in the morning becoming high overcast in the afternoon. |
Mt. Baker
| Saturday Night | Mostly cloudy with a chance of light rain and snow showers mainly in the evening. |
| Sunday | Partly sunny in the morning becoming overcast in the afternoon with a slight chance of rain and snow. |
Washington Pass and Leavenworth
| Saturday Night | Mostly cloudy with a slight chance of light rain and snow showers near the Cascade crest. Cooling trend. |
| Sunday | Partly sunny in the morning becoming overcast in the afternoon with a chance of light rain or snow. |
Stevens and Snoqualmie Pass
| Saturday Night | Cloudy with light rain and snow showers tapering off in the evening. Cooling trend. Light to moderate west wind in the Passes. |
| Sunday | Cloudy. Chance for light rain and snow in the afternoon. Light west wind in the Passes. |
Mt. Rainier, Crystal and White Pass
| Saturday Night | Cloudy with light rain and snow tapering off in the evening. Cooling trend. |
| Sunday | Cloudy. Light rain or snow likely developing late morning to mid-day. |
Mt. Hood
| Saturday Night | Cloudy with periods of light rain and snow. Cooling trend. |
| Sunday | Cloudy with periods of light rain and snow. |
Issued: 1:36 PM PST Saturday, December 21, 2019
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Saturday Evening | Snow Level | 3000' | 2500' | 3000' | 4000' | 3000' | 3000' | 3500' | 5000' |
| Saturday Night | Snow Level | 2500' | 2000' | 2000' | 2500' | 2500' | 2500' | 3000' | 3500' |
| Sunday Morning | Freezing Level | 2500' | 2000' | 2000' | 2500' | 2500' | 2500' | 3000' | 3000' |
| Sunday Afternoon | Snow Level | 3500' | 3000' | 3000' | 3500' | 3500' | 3500' | 3500' | 3500' |
| Sunday Evening | Snow Level | 2000' | 2000' | 2000' | 2500' | 2500' | 2500' | 3000' | 3500' |
| Sunday Night | Snow Level | 1500' | 1000' | 1000' | 2000' | 2000' | 2000' | 2000' | 3500' |
| Monday Morning | Snow Level | 1500' | 1000' | 1000' | 2000' | 2000' | 2000' | 2000' | 3000' |
| Monday Afternoon | Snow Level | 2000' | 1500' | 1500' | 2000' | 2000' | 2000' | 2000' | 3000' |
| Hurricane Ridge | Elevation |
|---|---|
| Saturday Evening |
Snow Level 3000' |
| Saturday Night |
Snow Level 2500' |
| Sunday Morning |
Freezing Level 2500' |
| Sunday Afternoon |
Snow Level 3500' |
| Sunday Evening |
Snow Level 2000' |
| Sunday Night |
Snow Level 1500' |
| Monday Morning |
Snow Level 1500' |
| Monday Afternoon |
Snow Level 2000' |
| Mt. Baker | Elevation |
|---|---|
| Saturday Evening |
Snow Level 2500' |
| Saturday Night |
Snow Level 2000' |
| Sunday Morning |
Freezing Level 2000' |
| Sunday Afternoon |
Snow Level 3000' |
| Sunday Evening |
Snow Level 2000' |
| Sunday Night |
Snow Level 1000' |
| Monday Morning |
Snow Level 1000' |
| Monday Afternoon |
Snow Level 1500' |
| Washington Pass | Elevation |
|---|---|
| Saturday Evening |
Snow Level 3000' |
| Saturday Night |
Snow Level 2000' |
| Sunday Morning |
Freezing Level 2000' |
| Sunday Afternoon |
Snow Level 3000' |
| Sunday Evening |
Snow Level 2000' |
| Sunday Night |
Snow Level 1000' |
| Monday Morning |
Snow Level 1000' |
| Monday Afternoon |
Snow Level 1500' |
| Leavenworth | Elevation |
|---|---|
| Saturday Evening |
Snow Level 4000' |
| Saturday Night |
Snow Level 2500' |
| Sunday Morning |
Freezing Level 2500' |
| Sunday Afternoon |
Snow Level 3500' |
| Sunday Evening |
Snow Level 2500' |
| Sunday Night |
Snow Level 2000' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 2000' |
| Stevens Pass | Elevation |
|---|---|
| Saturday Evening |
Snow Level 3000' |
| Saturday Night |
Snow Level 2500' |
| Sunday Morning |
Freezing Level 2500' |
| Sunday Afternoon |
Snow Level 3500' |
| Sunday Evening |
Snow Level 2500' |
| Sunday Night |
Snow Level 2000' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 2000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Saturday Evening |
Snow Level 3000' |
| Saturday Night |
Snow Level 2500' |
| Sunday Morning |
Freezing Level 2500' |
| Sunday Afternoon |
Snow Level 3500' |
| Sunday Evening |
Snow Level 2500' |
| Sunday Night |
Snow Level 2000' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 2000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Saturday Evening |
Snow Level 3500' |
| Saturday Night |
Snow Level 3000' |
| Sunday Morning |
Freezing Level 3000' |
| Sunday Afternoon |
Snow Level 3500' |
| Sunday Evening |
Snow Level 3000' |
| Sunday Night |
Snow Level 2000' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 2000' |
| Mt. Hood | Elevation |
|---|---|
| Saturday Evening |
Snow Level 5000' |
| Saturday Night |
Snow Level 3500' |
| Sunday Morning |
Freezing Level 3000' |
| Sunday Afternoon |
Snow Level 3500' |
| Sunday Evening |
Snow Level 3500' |
| Sunday Night |
Snow Level 3500' |
| Monday Morning |
Snow Level 3000' |
| Monday Afternoon |
Snow Level 3000' |
* 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
| Saturday Night | Monday | Monday Night | Monday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | LT 0.10 | 0 | 0 | 0 |
| Mt Baker Ski Area | LT 0.10 | 0 | LT 0.10 | 0 |
| Washington Pass | 0 | 0 | LT 0.10 | 0 |
| Leavenworth | 0 | 0 | LT 0.10 | 0 |
| Stevens Pass | LT 0.10 | LT 0.10 | LT 0.10 | LT 0.10 |
| Snoqualmie Pass | LT 0.10 | LT 0.10 | LT 0.25 | LT 0.10 |
| Mission Ridge | 0 | LT 0.10 | LT 0.25 | 0 |
| Crystal Mt | LT 0.10 | LT 0.10 | LT 0.10 | LT 0.10 |
| Paradise | LT 0.10 | LT 0.10 | LT 0.10 | LT 0.10 |
| White Pass | LT 0.10 | LT 0.10 | LT 0.25 | LT 0.10 |
| Mt Hood Meadows | LT 0.25 | LT 0.25 | 0.25 - 0.50 | LT 0.10 |
| Timberline | LT 0.25 | LT 0.25 | 0.25 - 0.50 | LT 0.10 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Monday | 0 |
| Monday Night | LT 0.10 |
| Monday | 0 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Saturday Night | 0 |
| Monday | 0 |
| Monday Night | LT 0.10 |
| Monday | 0 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Saturday Night | 0 |
| Monday | 0 |
| Monday Night | LT 0.10 |
| Monday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Monday | LT 0.10 |
| Monday Night | LT 0.10 |
| Monday | LT 0.10 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Monday | LT 0.10 |
| Monday Night | LT 0.25 |
| Monday | LT 0.10 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Saturday Night | 0 |
| Monday | LT 0.10 |
| Monday Night | LT 0.25 |
| Monday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Monday | LT 0.10 |
| Monday Night | LT 0.10 |
| Monday | LT 0.10 |
| Paradise | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Monday | LT 0.10 |
| Monday Night | LT 0.10 |
| Monday | LT 0.10 |
| White Pass | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Monday | LT 0.10 |
| Monday Night | LT 0.25 |
| Monday | LT 0.10 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.25 |
| Monday | LT 0.25 |
| Monday Night | 0.25 - 0.50 |
| Monday | LT 0.10 |
| Timberline | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.25 |
| Monday | LT 0.25 |
| Monday Night | 0.25 - 0.50 |
| Monday | 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: 1:36 PM PST Saturday, December 21, 2019
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Saturday Evening | SW 5 - 15 | W 0 - 10 | W 5 - 15 | W 0 - 10 | W 10 - 20 |
| Saturday Night | SW 0 - 10 | W 0 - 10 | W 5 - 15 | W 0 - 10 | WNW 5 - 15 |
| Sunday Morning | VAR 0 - 10 | VAR 0 - 10 | NW 5 - 15 | NW 0 - 10 | NE 5 - 15 |
| Sunday Afternoon | NE 0 - 10 | N 0 - 10 | NE 5 - 15 | NE 0 - 10 | E 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Saturday Evening | SW 5 - 15 |
| Saturday Night | SW 0 - 10 |
| Sunday Morning | VAR 0 - 10 |
| Sunday Afternoon | NE 0 - 10 |
| Mt. Baker | Elevation |
|---|---|
| Saturday Evening | W 0 - 10 |
| Saturday Night | W 0 - 10 |
| Sunday Morning | VAR 0 - 10 |
| Sunday Afternoon | N 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Saturday Evening | W 5 - 15 |
| Saturday Night | W 5 - 15 |
| Sunday Morning | NW 5 - 15 |
| Sunday Afternoon | NE 5 - 15 |
| Mt. Rainier | Elevation |
|---|---|
| Saturday Evening | W 0 - 10 |
| Saturday Night | W 0 - 10 |
| Sunday Morning | NW 0 - 10 |
| Sunday Afternoon | NE 0 - 10 |
| Mt. Hood | Elevation |
|---|---|
| Saturday Evening | W 10 - 20 |
| Saturday Night | WNW 5 - 15 |
| Sunday Morning | NE 5 - 15 |
| Sunday Afternoon | E 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Saturday Evening | SW 5 - 15 |
| Saturday Night | SW 0 - 10 |
| Sunday Morning | VAR 0 - 10 |
| Sunday Afternoon | NE 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Saturday Evening | W 0 - 10 |
| Saturday Night | W 0 - 10 |
| Sunday Morning | VAR 0 - 10 |
| Sunday Afternoon | N 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Saturday Evening | W 5 - 15 |
| Saturday Night | W 5 - 15 |
| Sunday Morning | NW 5 - 15 |
| Sunday Afternoon | NE 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Saturday Evening | W 0 - 10 |
| Saturday Night | W 0 - 10 |
| Sunday Morning | NW 0 - 10 |
| Sunday Afternoon | NE 0 - 10 |
| Mt. Hood | Direction - Speed |
|---|---|
| Saturday Evening | W 10 - 20 |
| Saturday Night | WNW 5 - 15 |
| Sunday Morning | NE 5 - 15 |
| Sunday Afternoon | 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 Evening | W 5 - 15 | SW 5 - 15 | W 15 - 25 | SW 20 - 30 | SW 25 - 35 |
| Saturday Night | W 10 - 20 | W 5 - 15 | W 10 - 20 | W 15 - 25 | SW 20 - 30 |
| Sunday Morning | SW 0 - 10 | SW 0 - 10 | SW 5 - 15 | SW 0 - 10 | S 15 - 25 |
| Sunday Afternoon | S 0 - 10 | S 0 - 10 | S 5 - 15 | S 10 - 20 | S 20 - 30 |
| Mt. Baker | Direction - Speed |
|---|---|
| Saturday Evening | W 5 - 15 |
| Saturday Night | W 10 - 20 |
| Sunday Morning | SW 0 - 10 |
| Sunday Afternoon | S 0 - 10 |
| Washington Pass | Direction - Speed |
|---|---|
| Saturday Evening | SW 5 - 15 |
| Saturday Night | W 5 - 15 |
| Sunday Morning | SW 0 - 10 |
| Sunday Afternoon | S 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Saturday Evening | W 15 - 25 |
| Saturday Night | W 10 - 20 |
| Sunday Morning | SW 5 - 15 |
| Sunday Afternoon | S 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Saturday Evening | SW 20 - 30 |
| Saturday Night | W 15 - 25 |
| Sunday Morning | SW 0 - 10 |
| Sunday Afternoon | S 10 - 20 |
| Mt. Hood | Direction - Speed |
|---|---|
| Saturday Evening | SW 25 - 35 |
| Saturday Night | SW 20 - 30 |
| Sunday Morning | S 15 - 25 |
| Sunday Afternoon | S 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: 1:36 PM PST Saturday, December 21, 2019
Extended Weather Synopsis for Monday night through Monday
After a dry Monday night, a weak front will approach the coast on Tuesday. The frontal boundary will likely weaken as it pushes inland but a trailing upper-level trough may produce a period of light snow showers, mainly along the west slopes of the Cascades and Mt. Hood area on Tuesday night or Wednesday. Snow levels will be relatively cool in the extended but there doesn't appear to be a big storm on the horizon. The jet stream is directing stronger weather systems to our south, leaving the Pacific Northwest in a cool upper-level trough.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Monday Night | Freezing Level | 500' - 1500' | 1000' - 2000' | 1500' - 2500' | * |
| Tuesday | Freezing Level | 1000' - 2000' | 1500' - 2500' | 2000' - 3000' | * |
| Tuesday Night | Snow Level | 500' - 1500' | 1000' - 2000' | 1500' - 2500' | * |
| Wednesday | Snow Level | 500' - 1500' | 500' - 1500' | 1000' - 2000' |
| Mt. Baker | Elevation |
|---|---|
| Monday Night |
Freezing Level 500' - 1500' (Easterly Flow *) |
| Tuesday |
Freezing Level 1000' - 2000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 500' - 1500' (Easterly Flow *) |
| Wednesday |
Snow Level 500' - 1500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Night |
Freezing Level 1000' - 2000' (Easterly Flow *) |
| Tuesday |
Freezing Level 1500' - 2500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 1000' - 2000' (Easterly Flow *) |
| Wednesday |
Snow Level 500' - 1500' |
| Mt. Hood | Elevation |
|---|---|
| Monday Night |
Freezing Level 1500' - 2500' (Easterly Flow *) |
| Tuesday |
Freezing Level 2000' - 3000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 1500' - 2500' (Easterly Flow *) |
| Wednesday |
Snow Level 1000' - 2000' |
* 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 Dec 21, 2019
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