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 night through Friday
A weak frontal boundary will weaken and stall over the Olympics and the far northwest Cascades Friday night and Saturday morning. A somewhat stronger north to south oriented frontal boundary will approach the coast Saturday afternoon, spreading light rain and snow inland late in the day. Expect cloud ceilings to lower for the Cascades in the afternoon with an uptick in winds as the front approaches.
The front will split and weaken as it passes inland Saturday night as the associated surface low curls sharply northward into central British Columbia. Embedded disturbances in westerly flow behind the front will keep showers going throughout the day, with modest snow accumulations possible for the west slopes of the Cascades and Mt. Hood. Snow levels will be remain cool Saturday night, but will begin to creep up during the day Sunday with rain mixing in at lower elevations.
Weather Forecast
Hurricane Ridge
| Friday Night | Cloudy with isolated light rain and snow showers. |
| Saturday | Cloudy with periods of light snow. Clouds lowering in the afternoon. |
Mt. Baker
| Friday Night | Mostly cloudy with isolated light rain and snow showers. |
| Saturday | Cloudy with periods of light snow. Clouds lowering in the afternoon. |
Washington Pass and Leavenworth
| Friday Night | Partly to mostly clear. |
| Saturday | Becoming cloudy in the morning with clouds lowering in the afternoon. |
Stevens and Snoqualmie Pass
| Friday Night | Partly to mostly cloudy with isolated light rain and snow showers. Light west wind in the Passes becoming east overnight. |
| Saturday | Becoming overcast during the morning with clouds lowering in the afternoon. Light east wind in the Passes increasing during the day. |
Mt. Rainier, Crystal and White Pass
| Friday Night | Partly to mostly cloudy with isolated light rain and snow showers. |
| Saturday | Becoming overcast during the morning with clouds lowering in the afternoon. |
Mt. Hood
| Friday Night | Partly to mostly cloudy with isolated light rain and snow showers. |
| Saturday | Becoming overcast during the morning with clouds lowering in the afternoon. |
Issued: 2:39 PM PST Friday, December 21, 2018
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Friday Evening | Snow Level | 2000' | 1500' | 1000' | 1000' | 1500' | 1500' | 2000' | 2000' |
| Friday Night | Snow Level | 2500' | 1500' | 0' | 1000' | 1500' | 1500' | 2000' | 2000' |
| Saturday Morning | Snow Level * | 3500' | 2000' | 1000' | 1500' | 2500' | 2000' | 3000' | 3500' |
| Saturday Afternoon | Snow Level * | 4000' | 2500' | 1500' | 1500' | 2500' | 2000' | 4000' | 4500' |
| Saturday Evening | Snow Level * | 4000' | 2000' | 1000' | 1000' | 1000' | 1500' | 2500' | 3000' |
| Saturday Night | Snow Level * | 4000' | 2000' | 1000' | 1500' | 1500' | 2000' | 3000' | 4000' |
| Sunday Morning | Snow Level | 4000' | 2500' | 1500' | 2500' | 2500' | 2500' | 3500' | 4000' |
| Sunday Afternoon | Snow Level | 4000' | 3000' | 3000' | 4000' | 4000' | 4000' | 4000' | 4500' |
| Hurricane Ridge | Elevation |
|---|---|
| Friday Evening |
Snow Level 2000' |
| Friday Night |
Snow Level 2500' |
| Saturday Morning |
Snow Level 3500' (Easterly Flow *) |
| Saturday Afternoon |
Snow Level 4000' (Easterly Flow *) |
| Saturday Evening |
Snow Level 4000' (Easterly Flow *) |
| Saturday Night |
Snow Level 4000' (Easterly Flow *) |
| Sunday Morning |
Snow Level 4000' |
| Sunday Afternoon |
Snow Level 4000' |
| Mt. Baker | Elevation |
|---|---|
| Friday Evening |
Snow Level 1500' |
| Friday Night |
Snow Level 1500' |
| Saturday Morning |
Snow Level 2000' (Easterly Flow *) |
| Saturday Afternoon |
Snow Level 2500' (Easterly Flow *) |
| Saturday Evening |
Snow Level 2000' (Easterly Flow *) |
| Saturday Night |
Snow Level 2000' (Easterly Flow *) |
| Sunday Morning |
Snow Level 2500' |
| Sunday Afternoon |
Snow Level 3000' |
| Washington Pass | Elevation |
|---|---|
| Friday Evening |
Snow Level 1000' |
| Friday Night |
Snow Level 0' |
| Saturday Morning |
Snow Level 1000' (Easterly Flow *) |
| Saturday Afternoon |
Snow Level 1500' (Easterly Flow *) |
| Saturday Evening |
Snow Level 1000' (Easterly Flow *) |
| Saturday Night |
Snow Level 1000' (Easterly Flow *) |
| Sunday Morning |
Snow Level 1500' |
| Sunday Afternoon |
Snow Level 3000' |
| Leavenworth | Elevation |
|---|---|
| Friday Evening |
Snow Level 1000' |
| Friday Night |
Snow Level 1000' |
| Saturday Morning |
Snow Level 1500' (Easterly Flow *) |
| Saturday Afternoon |
Snow Level 1500' (Easterly Flow *) |
| Saturday Evening |
Snow Level 1000' (Easterly Flow *) |
| Saturday Night |
Snow Level 1500' (Easterly Flow *) |
| Sunday Morning |
Snow Level 2500' |
| Sunday Afternoon |
Snow Level 4000' |
| Stevens Pass | Elevation |
|---|---|
| Friday Evening |
Snow Level 1500' |
| Friday Night |
Snow Level 1500' |
| Saturday Morning |
Snow Level 2500' (Easterly Flow *) |
| Saturday Afternoon |
Snow Level 2500' (Easterly Flow *) |
| Saturday Evening |
Snow Level 1000' (Easterly Flow *) |
| Saturday Night |
Snow Level 1500' (Easterly Flow *) |
| Sunday Morning |
Snow Level 2500' |
| Sunday Afternoon |
Snow Level 4000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Friday Evening |
Snow Level 1500' |
| Friday Night |
Snow Level 1500' |
| Saturday Morning |
Snow Level 2000' (Easterly Flow *) |
| Saturday Afternoon |
Snow Level 2000' (Easterly Flow *) |
| Saturday Evening |
Snow Level 1500' (Easterly Flow *) |
| Saturday Night |
Snow Level 2000' (Easterly Flow *) |
| Sunday Morning |
Snow Level 2500' |
| Sunday Afternoon |
Snow Level 4000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Friday Evening |
Snow Level 2000' |
| Friday Night |
Snow Level 2000' |
| Saturday Morning |
Snow Level 3000' (Easterly Flow *) |
| Saturday Afternoon |
Snow Level 4000' (Easterly Flow *) |
| Saturday Evening |
Snow Level 2500' (Easterly Flow *) |
| Saturday Night |
Snow Level 3000' (Easterly Flow *) |
| Sunday Morning |
Snow Level 3500' |
| Sunday Afternoon |
Snow Level 4000' |
| Mt. Hood | Elevation |
|---|---|
| Friday Evening |
Snow Level 2000' |
| Friday Night |
Snow Level 2000' |
| Saturday Morning |
Snow Level 3500' (Easterly Flow *) |
| Saturday Afternoon |
Snow Level 4500' (Easterly Flow *) |
| Saturday Evening |
Snow Level 3000' (Easterly Flow *) |
| Saturday Night |
Snow Level 4000' (Easterly Flow *) |
| Sunday Morning |
Snow Level 4000' |
| Sunday Afternoon |
Snow Level 4500' |
* 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
| Friday Night | Friday | Friday Night | Friday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | LT 0.25 | LT 0.25 | 0.50 | LT 0.25 |
| Mt Baker Ski Area | LT 0.25 | 0.25 | 0.75 -1.00 | 0.50 |
| Washington Pass | LT 0.10 | LT 0.10 | 0.25 | LT 0.25 |
| Leavenworth | 0 | LT 0.10 | 0.25 | LT 0.10 |
| Stevens Pass | LT 0.10 | LT 0.10 | 0.50 | 0.25 - 0.50 |
| Snoqualmie Pass | LT 0.10 | LT 0.10 | 0.50 - 0.75 | 0.50 |
| Mission Ridge | 0 | LT 0.10 | 0.25 - 0.50 | LT 0.10 |
| Crystal Mt | LT 0.10 | LT 0.10 | 0.50 | 0.25 |
| Paradise | LT 0.10 | LT 0.10 | 0.50 - 0.75 | 0.50 - 0.75 |
| White Pass | LT 0.10 | LT 0.10 | 0.25 - 0.50 | 0.25 - 0.50 |
| Mt Hood Meadows | 0 | LT 0.10 | 0.50 - 0.75 | 0.50 |
| Timberline | 0 | LT 0.10 | 0.75 | 0.50 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.25 |
| Friday | LT 0.25 |
| Friday Night | 0.50 |
| Friday | LT 0.25 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.25 |
| Friday | 0.25 |
| Friday Night | 0.75 -1.00 |
| Friday | 0.50 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.10 |
| Friday | LT 0.10 |
| Friday Night | 0.25 |
| Friday | LT 0.25 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Friday Night | 0 |
| Friday | LT 0.10 |
| Friday Night | 0.25 |
| Friday | LT 0.10 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.10 |
| Friday | LT 0.10 |
| Friday Night | 0.50 |
| Friday | 0.25 - 0.50 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.10 |
| Friday | LT 0.10 |
| Friday Night | 0.50 - 0.75 |
| Friday | 0.50 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Friday Night | 0 |
| Friday | LT 0.10 |
| Friday Night | 0.25 - 0.50 |
| Friday | LT 0.10 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.10 |
| Friday | LT 0.10 |
| Friday Night | 0.50 |
| Friday | 0.25 |
| Paradise | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.10 |
| Friday | LT 0.10 |
| Friday Night | 0.50 - 0.75 |
| Friday | 0.50 - 0.75 |
| White Pass | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.10 |
| Friday | LT 0.10 |
| Friday Night | 0.25 - 0.50 |
| Friday | 0.25 - 0.50 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Friday Night | 0 |
| Friday | LT 0.10 |
| Friday Night | 0.50 - 0.75 |
| Friday | 0.50 |
| Timberline | Precipitation Forecast |
|---|---|
| Friday Night | 0 |
| Friday | LT 0.10 |
| Friday Night | 0.75 |
| Friday | 0.50 |
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: 2:39 PM PST Friday, December 21, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Friday Evening | SW 0 - 10 | S 0 - 10 | W 5 - 15 | W 0 - 10 | W 5 - 15 |
| Friday Night | S 5 - 15 | SE 0 - 10 | VAR 0 - 10 | SW 0 - 10 | SW 0 - 10 |
| Saturday Morning | S 10 - 20 | SE 5 - 15 | SE 5 - 15 | S 0 - 10 | SE 5 - 15 |
| Saturday Afternoon | S 25 - 35 | SE 15 - 25 | SE 10 - 20 | SE 15 - 25 | S 10 - 20 |
| Hurricane Ridge | Elevation |
|---|---|
| Friday Evening | SW 0 - 10 |
| Friday Night | S 5 - 15 |
| Saturday Morning | S 10 - 20 |
| Saturday Afternoon | S 25 - 35 |
| Mt. Baker | Elevation |
|---|---|
| Friday Evening | S 0 - 10 |
| Friday Night | SE 0 - 10 |
| Saturday Morning | SE 5 - 15 |
| Saturday Afternoon | SE 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Friday Evening | W 5 - 15 |
| Friday Night | VAR 0 - 10 |
| Saturday Morning | SE 5 - 15 |
| Saturday Afternoon | SE 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Friday Evening | W 0 - 10 |
| Friday Night | SW 0 - 10 |
| Saturday Morning | S 0 - 10 |
| Saturday Afternoon | SE 15 - 25 |
| Mt. Hood | Elevation |
|---|---|
| Friday Evening | W 5 - 15 |
| Friday Night | SW 0 - 10 |
| Saturday Morning | SE 5 - 15 |
| Saturday Afternoon | S 10 - 20 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Friday Evening | SW 0 - 10 |
| Friday Night | S 5 - 15 |
| Saturday Morning | S 10 - 20 |
| Saturday Afternoon | S 25 - 35 |
| Mt. Baker | Direction - Speed |
|---|---|
| Friday Evening | S 0 - 10 |
| Friday Night | SE 0 - 10 |
| Saturday Morning | SE 5 - 15 |
| Saturday Afternoon | SE 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Friday Evening | W 5 - 15 |
| Friday Night | VAR 0 - 10 |
| Saturday Morning | SE 5 - 15 |
| Saturday Afternoon | SE 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Friday Evening | W 0 - 10 |
| Friday Night | SW 0 - 10 |
| Saturday Morning | S 0 - 10 |
| Saturday Afternoon | SE 15 - 25 |
| Mt. Hood | Direction - Speed |
|---|---|
| Friday Evening | W 5 - 15 |
| Friday Night | SW 0 - 10 |
| Saturday Morning | SE 5 - 15 |
| Saturday Afternoon | S 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 | |
|---|---|---|---|---|---|
| Friday Evening | W 15 - 25 | W 15 - 25 | WNW 20 - 30 | WNW 20 - 30 | NW 20 - 30 |
| Friday Night | SW 20 - 30 | W 20 - 30 | W 25 - 35 | W 20 - 30 | NW 20 - 30 |
| Saturday Morning | SW 15 - 25 | SW 10 - 20 | SW 15 - 25 | SW 15 - 25 | SW 10 - 20 |
| Saturday Afternoon | S 30 - 40 | SSW 20 - 30 | SW 25 - 35 | SW 35 - 45 | SW 25 - 35 |
| Mt. Baker | Direction - Speed |
|---|---|
| Friday Evening | W 15 - 25 |
| Friday Night | SW 20 - 30 |
| Saturday Morning | SW 15 - 25 |
| Saturday Afternoon | S 30 - 40 |
| Washington Pass | Direction - Speed |
|---|---|
| Friday Evening | W 15 - 25 |
| Friday Night | W 20 - 30 |
| Saturday Morning | SW 10 - 20 |
| Saturday Afternoon | SSW 20 - 30 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Friday Evening | WNW 20 - 30 |
| Friday Night | W 25 - 35 |
| Saturday Morning | SW 15 - 25 |
| Saturday Afternoon | SW 25 - 35 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Friday Evening | WNW 20 - 30 |
| Friday Night | W 20 - 30 |
| Saturday Morning | SW 15 - 25 |
| Saturday Afternoon | SW 35 - 45 |
| Mt. Hood | Direction - Speed |
|---|---|
| Friday Evening | NW 20 - 30 |
| Friday Night | NW 20 - 30 |
| Saturday Morning | SW 10 - 20 |
| Saturday Afternoon | SW 25 - 35 |
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: 2:39 PM PST Friday, December 21, 2018
Extended Weather Synopsis for Friday night through Friday
Showers should diminish Sunday night. On Monday, forecast models diverge on solutions. At this time, the most likely scenario is a low pressure system developing offshore and diving south, clipping the central Washington Cascades and bringing light to moderate precipitation to the south Washington Cascades and Mt. Hood area with cool snow levels. Upper level ridging will build offshore around 130W on Christmas Day, providing us with, gasp, a mostly dry day.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Sunday Night | Snow Level | 2500' - 3500' | 3000' - 4000' | 3500' - 4500' | |
| Monday | Snow Level | 2000' - 3000' | 2500' - 3500' | 2500' - 3500' | |
| Monday Night | Snow Level | 1000' - 2000' | 1500' - 2500' | 1500' - 2500' | |
| Tuesday | Snow Level | 1000' - 2000' | 2000' - 3000' | 2500' - 3500' |
| Mt. Baker | Elevation |
|---|---|
| Sunday Night |
Snow Level 2500' - 3500' |
| Monday |
Snow Level 2000' - 3000' |
| Monday Night |
Snow Level 1000' - 2000' |
| Tuesday |
Snow Level 1000' - 2000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Night |
Snow Level 3000' - 4000' |
| Monday |
Snow Level 2500' - 3500' |
| Monday Night |
Snow Level 1500' - 2500' |
| Tuesday |
Snow Level 2000' - 3000' |
| Mt. Hood | Elevation |
|---|---|
| Sunday Night |
Snow Level 3500' - 4500' |
| Monday |
Snow Level 2500' - 3500' |
| Monday Night |
Snow Level 1500' - 2500' |
| Tuesday |
Snow Level 2500' - 3500' |
* 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, 2018
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