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 Sunday
A diffuse trough lingers over the Pacific Northwest with weak upper-level disturbances moving across the region on NW flow. Each disturbance spawns or maintains scattered to isolated snow shower activity or weak convergence zones as they pass, taking advantage of the moisture in place at low levels of the atmosphere. A weak low moves onshore over central Oregon this evening and weak upper-level shortwave trough moves across northern and eastern Washington on Sunday. We're keeping a chance of precipitation in the forecast through the day on Sunday, with light winds and an unstable air mass keeping light snow showers, snow squalls, or weak convergence zones (central Cascades) over an area for several hours at a time with minimal movement. Some areas could pick up several inches of snow in a few hours, but timing and locations are very difficult to forecast.
Northwest flow increases aloft on Sunday evening along with high clouds as a weak ridge moves into the nearshore waters and the next system tries to work its way over the top of the ridge. At this time it appears that Sunday night should be mostly dry.
On Monday, the ridge moves over our region as a warm front lifts northward across the coastal waters and skirts western Washington, bringing warmer temperatures west of the Cascade Crest along with increased lowering and thickening clouds or very light rain and snow for the Olympics and Mt. Baker. A light E flow also develops through the Cascade mountain gaps with entrenched cold air E of the Cascade Crest spilling through.
Weather Forecast
Hurricane Ridge
| Saturday Night | Mostly clear. |
| Sunday | Mostly sunny. |
Mt. Baker
| Saturday Night | Cloudy with slow-moving isolated snow showers. |
| Sunday | Cloudy with a slight chance of slow-moving isolated snow showers. |
Washington Pass and Leavenworth
| Saturday Night | Partly cloudy with isolated snow showers possible near the Cascade Crest. Colder. |
| Sunday | Partly cloudy. |
Stevens and Snoqualmie Pass
| Saturday Night | Cloudy with scattered snow showers for Snoqualmie and isolated snow showers for Stevens Pass. Weak convergence is possible. Colder. Light W wind through the Passes. |
| Sunday | Mostly cloudy with isolated snow showers or weak convergence possible. Colder. Light W wind through the Passes. |
Mt. Rainier, Crystal and White Pass
| Saturday Night | Mostly cloudy with scattered to isolated snow showers possible. Colder. |
| Sunday | Mostly cloudy with isolated snow showers possible with more sunshine likely in the afternoon. Colder. |
Mt. Hood
| Saturday Night | Mostly cloudy with scattered to isolated snow showers possible. Colder. |
| Sunday | Mostly sunny. |
Issued: 2:59 PM PST Saturday, December 14, 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 | 2000' | 1500' | 1000' | 1500' | 2000' | 2000' | 2000' | 2500' |
| Saturday Night | Snow Level | 2000' | 1000' | 500' | 1000' | 1500' | 1500' | 1500' | 2000' |
| Sunday Morning | Snow Level | 1500' | 500' | 0' | 500' | 1000' | 1500' | 1500' | 1500' |
| Sunday Afternoon | Snow Level | 2000' | 1000' | 1000' | 1500' | 1500' | 1500' | 2000' | 2000' |
| Sunday Evening | Freezing Level | 2500' | 1500' | 1000' | 1000' | 1000' | 1000' | 1000' | 2000' |
| Sunday Night | Freezing Level | 2500' | 1000' | 1000' | 1000' | 1000' | 1000' | 1500' | 2000' |
| Monday Morning | Snow Level * | 2000' | 0' | 0' | 500' | 500' | 500' | 1000' | 1500' |
| Monday Afternoon | Snow Level * | 3500' | 2000' | 1500' | 1500' | 2500' | 2500' | 3000' | 3500' |
| Hurricane Ridge | Elevation |
|---|---|
| Saturday Evening |
Snow Level 2000' |
| Saturday Night |
Snow Level 2000' |
| Sunday Morning |
Snow Level 1500' |
| Sunday Afternoon |
Snow Level 2000' |
| Sunday Evening |
Freezing Level 2500' |
| Sunday Night |
Freezing Level 2500' |
| Monday Morning |
Snow Level 2000' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 3500' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Saturday Evening |
Snow Level 1500' |
| Saturday Night |
Snow Level 1000' |
| Sunday Morning |
Snow Level 500' |
| Sunday Afternoon |
Snow Level 1000' |
| Sunday Evening |
Freezing Level 1500' |
| Sunday Night |
Freezing Level 1000' |
| Monday Morning |
Snow Level 0' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 2000' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Saturday Evening |
Snow Level 1000' |
| Saturday Night |
Snow Level 500' |
| Sunday Morning |
Snow Level 0' |
| Sunday Afternoon |
Snow Level 1000' |
| Sunday Evening |
Freezing Level 1000' |
| Sunday Night |
Freezing Level 1000' |
| Monday Morning |
Snow Level 0' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 1500' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Saturday Evening |
Snow Level 1500' |
| Saturday Night |
Snow Level 1000' |
| Sunday Morning |
Snow Level 500' |
| Sunday Afternoon |
Snow Level 1500' |
| Sunday Evening |
Freezing Level 1000' |
| Sunday Night |
Freezing Level 1000' |
| Monday Morning |
Snow Level 500' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 1500' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Saturday Evening |
Snow Level 2000' |
| Saturday Night |
Snow Level 1500' |
| Sunday Morning |
Snow Level 1000' |
| Sunday Afternoon |
Snow Level 1500' |
| Sunday Evening |
Freezing Level 1000' |
| Sunday Night |
Freezing Level 1000' |
| Monday Morning |
Snow Level 500' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 2500' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Saturday Evening |
Snow Level 2000' |
| Saturday Night |
Snow Level 1500' |
| Sunday Morning |
Snow Level 1500' |
| Sunday Afternoon |
Snow Level 1500' |
| Sunday Evening |
Freezing Level 1000' |
| Sunday Night |
Freezing Level 1000' |
| Monday Morning |
Snow Level 500' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 2500' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Saturday Evening |
Snow Level 2000' |
| Saturday Night |
Snow Level 1500' |
| Sunday Morning |
Snow Level 1500' |
| Sunday Afternoon |
Snow Level 2000' |
| Sunday Evening |
Freezing Level 1000' |
| Sunday Night |
Freezing Level 1500' |
| Monday Morning |
Snow Level 1000' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 3000' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Saturday Evening |
Snow Level 2500' |
| Saturday Night |
Snow Level 2000' |
| Sunday Morning |
Snow Level 1500' |
| Sunday Afternoon |
Snow Level 2000' |
| Sunday Evening |
Freezing Level 2000' |
| Sunday Night |
Freezing Level 2000' |
| Monday Morning |
Snow Level 1500' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 3500' (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
| Saturday Night | Sunday | Sunday Night | Sunday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | 0 | 0 | 0 | LT 0.10 |
| Mt Baker Ski Area | LT 0.10 | 0 | 0 | LT 0.10 |
| Washington Pass | 0 | 0 | 0 | 0 |
| Leavenworth | 0 | 0 | 0 | 0 |
| Stevens Pass | LT 0.10 | LT 0.10 | 0 | LT 0.10 |
| Snoqualmie Pass | LT 0.10 | LT 0.10 | 0 | LT 0.10 |
| Mission Ridge | 0 | 0 | 0 | 0 |
| Crystal Mt | 0 | 0 | 0 | 0 |
| Paradise | LT 0.10 | 0 | 0 | LT 0.10 |
| White Pass | 0 | 0 | 0 | 0 |
| Mt Hood Meadows | LT 0.10 | 0 | 0 | LT 0.10 |
| Timberline | LT 0.10 | 0 | 0 | LT 0.10 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Saturday Night | 0 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | LT 0.10 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | LT 0.10 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Saturday Night | 0 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | 0 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Saturday Night | 0 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Sunday | LT 0.10 |
| Sunday Night | 0 |
| Sunday | LT 0.10 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Sunday | LT 0.10 |
| Sunday Night | 0 |
| Sunday | LT 0.10 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Saturday Night | 0 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Saturday Night | 0 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | 0 |
| Paradise | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | LT 0.10 |
| White Pass | Precipitation Forecast |
|---|---|
| Saturday Night | 0 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | 0 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | LT 0.10 |
| Timberline | Precipitation Forecast |
|---|---|
| Saturday Night | LT 0.10 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | 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: 2:59 PM PST Saturday, December 14, 2019
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Saturday Evening | W 0 - 10 | WSW 0 - 10 | W 0 - 10 | W 0 - 10 | W 0 - 10 |
| Saturday Night | W 5 - 15 | WSW 5 - 15 | W 5 - 15 | W 5 - 15 | W 5 - 15 |
| Sunday Morning | W 5 - 15 | W 0 - 10 | W 5 - 15 | W 5 - 15 | W 10 - 20 |
| Sunday Afternoon | WSW 0 - 10 | SW 0 - 10 | W 5 - 15 | W 5 - 15 | W 10 - 20 |
| Hurricane Ridge | Elevation |
|---|---|
| Saturday Evening | W 0 - 10 |
| Saturday Night | W 5 - 15 |
| Sunday Morning | W 5 - 15 |
| Sunday Afternoon | WSW 0 - 10 |
| Mt. Baker | Elevation |
|---|---|
| Saturday Evening | WSW 0 - 10 |
| Saturday Night | WSW 5 - 15 |
| Sunday Morning | W 0 - 10 |
| Sunday Afternoon | SW 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Saturday Evening | W 0 - 10 |
| Saturday Night | W 5 - 15 |
| Sunday Morning | W 5 - 15 |
| Sunday Afternoon | W 5 - 15 |
| Mt. Rainier | Elevation |
|---|---|
| Saturday Evening | W 0 - 10 |
| Saturday Night | W 5 - 15 |
| Sunday Morning | W 5 - 15 |
| Sunday Afternoon | W 5 - 15 |
| Mt. Hood | Elevation |
|---|---|
| Saturday Evening | W 0 - 10 |
| Saturday Night | W 5 - 15 |
| Sunday Morning | W 10 - 20 |
| Sunday Afternoon | W 10 - 20 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Saturday Evening | W 0 - 10 |
| Saturday Night | W 5 - 15 |
| Sunday Morning | W 5 - 15 |
| Sunday Afternoon | WSW 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Saturday Evening | WSW 0 - 10 |
| Saturday Night | WSW 5 - 15 |
| Sunday Morning | W 0 - 10 |
| Sunday Afternoon | SW 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Saturday Evening | W 0 - 10 |
| Saturday Night | W 5 - 15 |
| Sunday Morning | W 5 - 15 |
| Sunday Afternoon | W 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Saturday Evening | W 0 - 10 |
| Saturday Night | W 5 - 15 |
| Sunday Morning | W 5 - 15 |
| Sunday Afternoon | W 5 - 15 |
| Mt. Hood | Direction - Speed |
|---|---|
| Saturday Evening | W 0 - 10 |
| Saturday Night | W 5 - 15 |
| Sunday Morning | W 10 - 20 |
| Sunday Afternoon | W 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.
Free Winds at 9000' (mph)
| Mt. Baker | Washington Pass | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Saturday Evening | W 10 - 20 | W 5 - 15 | WNW 15 - 25 | WNW 10 - 20 | WNW 0 - 10 |
| Saturday Night | WNW 15 - 25 | W 10 - 20 | WNW 25 - 35 | WNW 20 - 30 | NW 15 - 25 |
| Sunday Morning | NW 5 - 15 | NW 10 - 20 | WNW 20 - 30 | WNW 20 - 30 | WSW 20 - 30 |
| Sunday Afternoon | WNW 10 - 20 | WNW 10 - 20 | NW 20 - 30 | NW 20 - 30 | WNW 20 - 30 |
| Mt. Baker | Direction - Speed |
|---|---|
| Saturday Evening | W 10 - 20 |
| Saturday Night | WNW 15 - 25 |
| Sunday Morning | NW 5 - 15 |
| Sunday Afternoon | WNW 10 - 20 |
| Washington Pass | Direction - Speed |
|---|---|
| Saturday Evening | W 5 - 15 |
| Saturday Night | W 10 - 20 |
| Sunday Morning | NW 10 - 20 |
| Sunday Afternoon | WNW 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Saturday Evening | WNW 15 - 25 |
| Saturday Night | WNW 25 - 35 |
| Sunday Morning | WNW 20 - 30 |
| Sunday Afternoon | NW 20 - 30 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Saturday Evening | WNW 10 - 20 |
| Saturday Night | WNW 20 - 30 |
| Sunday Morning | WNW 20 - 30 |
| Sunday Afternoon | NW 20 - 30 |
| Mt. Hood | Direction - Speed |
|---|---|
| Saturday Evening | WNW 0 - 10 |
| Saturday Night | NW 15 - 25 |
| Sunday Morning | WSW 20 - 30 |
| Sunday Afternoon | WNW 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: 2:59 PM PST Saturday, December 14, 2019
Extended Weather Synopsis for Sunday night through Sunday
The ridge slides east of our region as an elongated N-S trough moves into our coastal waters on Monday night. The trough flattens and weakens as it eases towards the coast, arriving by Tuesday night, bringing cloudy conditions and moderating temperatures out ahead of it with some light rain and snow at elevated snow levels favoring the Olympics and Baker regions late Tuesday through Wednesday morning. Entrenched cold air should remain in place along the E slopes of the Cascades and spills through the Cascade passes on moderate to strong E winds Monday night through Wednesday
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Monday Night | Snow Level | 2500' - 3500' | 2000' - 3000' | 3000' - 4000' | * |
| Tuesday | Snow Level | 3000' - 4000' | 2000' - 3000' | 3000' - 4000' | * |
| Tuesday Night | Snow Level | 3000' - 4000' | 2000' - 3000' | 2500' - 3500' | * |
| Wednesday | Snow Level | 2000' - 3000' | 1500' - 2500' | 2000' - 3000' | * |
| Mt. Baker | Elevation |
|---|---|
| Monday Night |
Snow Level 2500' - 3500' (Easterly Flow *) |
| Tuesday |
Snow Level 3000' - 4000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 3000' - 4000' (Easterly Flow *) |
| Wednesday |
Snow Level 2000' - 3000' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Night |
Snow Level 2000' - 3000' (Easterly Flow *) |
| Tuesday |
Snow Level 2000' - 3000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 2000' - 3000' (Easterly Flow *) |
| Wednesday |
Snow Level 1500' - 2500' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Monday Night |
Snow Level 3000' - 4000' (Easterly Flow *) |
| Tuesday |
Snow Level 3000' - 4000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 2500' - 3500' (Easterly Flow *) |
| Wednesday |
Snow Level 2000' - 3000' (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.
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 14, 2019
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