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
The Pacific Northwest sits north of an active subtropical jet arcing to form a weak ridge to our south and leaving us with remnant moisture from the first major snow event of the season. The location of the ridge is working against the development of instability (aka additional weather) offshore. A weak upper-level disturbance shears as it moves toward northern Oregon Friday evening and it may create some convergence in the central Cascades, but any increase in snow shower activity should be marginal as low-level moisture continues to decrease. Snow levels drop below Snoqualmie pass level Friday night and continue the trend on Saturday as snow shower activity decreases and mostly ends by Saturday evening. Expect the sun to make more of an appearance in the Olympics and E slopes of the Cascades Saturday afternoon.
Weak NW flow develops on Saturday night and continues through Sunday as a ridge develops offshore. This should generally bring fair weather with some clouds pinned against the W slopes of the Cascades, with the potential for snow flurries.
Weather Forecast
Hurricane Ridge
| Friday Night | Cloudy with scattered snow showers. |
| Saturday | Mostly cloudy in the morning with isolated snow showers, then becoming mostly sunny in the afternoon. |
Mt. Baker
| Friday Night | Cloudy with scattered snow showers. |
| Saturday | Cloudy with a chance of snow showers, mainly in the morning. |
Washington Pass and Leavenworth
| Friday Night | Cloudy with a chance of light snow showers, mainly near the Cascade Crest. |
| Saturday | Partly cloudy with a chance of snow showers in the morning hours, mainly near the Cascade Crest. |
Stevens and Snoqualmie Pass
| Friday Night | Cloudy with light snow showers (locally intense). Convergence bands may develop. Light W wind through the Passes. |
| Saturday | Cloudy with light snow showers (locally intense), mainly in the morning. Convergence bands are possible. Light W wind through the Passes. |
Mt. Rainier, Crystal and White Pass
| Friday Night | Cloudy with scattered light snow showers (locally intense). |
| Saturday | Cloudy with scattered light snow showers in the morning, becoming isolated in the afternoon. |
Mt. Hood
| Friday Night | Cloudy with scattered light snow showers. |
| Saturday | Cloudy with scattered light snow showers. |
Issued: 2:16 PM PST Friday, December 13, 2019
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 | 2500' | 2000' | 2000' | 2500' | 2500' | 2500' | 2500' | 3000' |
| Friday Night | Snow Level | 2000' | 1500' | 1000' | 2000' | 1500' | 2000' | 2000' | 2500' |
| Saturday Morning | Snow Level | 2000' | 1500' | 500' | 1500' | 2000' | 2000' | 2000' | 2000' |
| Saturday Afternoon | Snow Level | 2500' | 1500' | 2000' | 2500' | 2000' | 2000' | 2500' | 2500' |
| Saturday Evening | Freezing Level | 2500' | 2000' | 1500' | 2000' | 2500' | 2500' | 2500' | 3500' |
| Saturday Night | Freezing Level | 2000' | 1500' | 1000' | 1500' | 2000' | 2000' | 1500' | 3000' |
| Sunday Morning | Freezing Level | 2000' | 1000' | 1000' | 1000' | 1000' | 1500' | 1500' | 2500' |
| Sunday Afternoon | Freezing Level | 2500' | 2000' | 2000' | 2500' | 2500' | 2500' | 2500' | 3000' |
| Hurricane Ridge | Elevation |
|---|---|
| Friday Evening |
Snow Level 2500' |
| Friday Night |
Snow Level 2000' |
| Saturday Morning |
Snow Level 2000' |
| Saturday Afternoon |
Snow Level 2500' |
| Saturday Evening |
Freezing Level 2500' |
| Saturday Night |
Freezing Level 2000' |
| Sunday Morning |
Freezing Level 2000' |
| Sunday Afternoon |
Freezing Level 2500' |
| Mt. Baker | Elevation |
|---|---|
| Friday Evening |
Snow Level 2000' |
| Friday Night |
Snow Level 1500' |
| Saturday Morning |
Snow Level 1500' |
| Saturday Afternoon |
Snow Level 1500' |
| Saturday Evening |
Freezing Level 2000' |
| Saturday Night |
Freezing Level 1500' |
| Sunday Morning |
Freezing Level 1000' |
| Sunday Afternoon |
Freezing Level 2000' |
| Washington Pass | Elevation |
|---|---|
| Friday Evening |
Snow Level 2000' |
| Friday Night |
Snow Level 1000' |
| Saturday Morning |
Snow Level 500' |
| Saturday Afternoon |
Snow Level 2000' |
| Saturday Evening |
Freezing Level 1500' |
| Saturday Night |
Freezing Level 1000' |
| Sunday Morning |
Freezing Level 1000' |
| Sunday Afternoon |
Freezing Level 2000' |
| Leavenworth | Elevation |
|---|---|
| Friday Evening |
Snow Level 2500' |
| Friday Night |
Snow Level 2000' |
| Saturday Morning |
Snow Level 1500' |
| Saturday Afternoon |
Snow Level 2500' |
| Saturday Evening |
Freezing Level 2000' |
| Saturday Night |
Freezing Level 1500' |
| Sunday Morning |
Freezing Level 1000' |
| Sunday Afternoon |
Freezing Level 2500' |
| Stevens Pass | Elevation |
|---|---|
| Friday Evening |
Snow Level 2500' |
| Friday Night |
Snow Level 1500' |
| Saturday Morning |
Snow Level 2000' |
| Saturday Afternoon |
Snow Level 2000' |
| Saturday Evening |
Freezing Level 2500' |
| Saturday Night |
Freezing Level 2000' |
| Sunday Morning |
Freezing Level 1000' |
| Sunday Afternoon |
Freezing Level 2500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Friday Evening |
Snow Level 2500' |
| Friday Night |
Snow Level 2000' |
| Saturday Morning |
Snow Level 2000' |
| Saturday Afternoon |
Snow Level 2000' |
| Saturday Evening |
Freezing Level 2500' |
| Saturday Night |
Freezing Level 2000' |
| Sunday Morning |
Freezing Level 1500' |
| Sunday Afternoon |
Freezing Level 2500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Friday Evening |
Snow Level 2500' |
| Friday Night |
Snow Level 2000' |
| Saturday Morning |
Snow Level 2000' |
| Saturday Afternoon |
Snow Level 2500' |
| Saturday Evening |
Freezing Level 2500' |
| Saturday Night |
Freezing Level 1500' |
| Sunday Morning |
Freezing Level 1500' |
| Sunday Afternoon |
Freezing Level 2500' |
| Mt. Hood | Elevation |
|---|---|
| Friday Evening |
Snow Level 3000' |
| Friday Night |
Snow Level 2500' |
| Saturday Morning |
Snow Level 2000' |
| Saturday Afternoon |
Snow Level 2500' |
| Saturday Evening |
Freezing Level 3500' |
| Saturday Night |
Freezing Level 3000' |
| Sunday Morning |
Freezing Level 2500' |
| Sunday Afternoon |
Freezing 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
| 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 | 0 | 0 | 0 |
| Mt Baker Ski Area | LT 0.10 | LT 0.10 | 0 | 0 |
| Washington Pass | 0 | 0 | 0 | 0 |
| Leavenworth | LT 0.10 | 0 | 0 | 0 |
| Stevens Pass | 0.25 | LT 0.10 | 0 | 0 |
| Snoqualmie Pass | LT 0.25 | LT 0.10 | 0 | 0 |
| Mission Ridge | LT 0.25 | 0 | 0 | 0 |
| Crystal Mt | LT 0.25 | LT 0.10 | 0 | 0 |
| Paradise | LT 0.25 | LT 0.10 | 0 | 0 |
| White Pass | LT 0.10 | LT 0.10 | 0 | 0 |
| Mt Hood Meadows | LT 0.10 | LT 0.25 | 0 | 0 |
| Timberline | LT 0.10 | LT 0.25 | 0 | 0 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.25 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.10 |
| Friday | LT 0.10 |
| Friday Night | 0 |
| Friday | 0 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Friday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.10 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Friday Night | 0.25 |
| Friday | LT 0.10 |
| Friday Night | 0 |
| Friday | 0 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.25 |
| Friday | LT 0.10 |
| Friday Night | 0 |
| Friday | 0 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.25 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.25 |
| Friday | LT 0.10 |
| Friday Night | 0 |
| Friday | 0 |
| Paradise | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.25 |
| Friday | LT 0.10 |
| Friday Night | 0 |
| Friday | 0 |
| White Pass | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.10 |
| Friday | LT 0.10 |
| Friday Night | 0 |
| Friday | 0 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.10 |
| Friday | LT 0.25 |
| Friday Night | 0 |
| Friday | 0 |
| Timberline | Precipitation Forecast |
|---|---|
| Friday Night | LT 0.10 |
| Friday | LT 0.25 |
| Friday Night | 0 |
| Friday | 0 |
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: 2:16 PM PST Friday, December 13, 2019
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Friday Evening | W 0 - 10 | SW 0 - 10 | W 0 - 10 | WSW 0 - 10 | W 5 - 15 |
| Friday Night | W 0 - 10 | W 0 - 10 | W 5 - 15 | W 0 - 10 | W 10 - 20 |
| Saturday Morning | WSW 0 - 10 | W 0 - 10 | W 5 - 15 | WSW 0 - 10 | W 10 - 20 |
| Saturday Afternoon | W 0 - 10 | WSW 0 - 10 | W 0 - 10 | W 0 - 10 | W 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Friday Evening | W 0 - 10 |
| Friday Night | W 0 - 10 |
| Saturday Morning | WSW 0 - 10 |
| Saturday Afternoon | W 0 - 10 |
| Mt. Baker | Elevation |
|---|---|
| Friday Evening | SW 0 - 10 |
| Friday Night | W 0 - 10 |
| Saturday Morning | W 0 - 10 |
| Saturday Afternoon | WSW 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Friday Evening | W 0 - 10 |
| Friday Night | W 5 - 15 |
| Saturday Morning | W 5 - 15 |
| Saturday Afternoon | W 0 - 10 |
| Mt. Rainier | Elevation |
|---|---|
| Friday Evening | WSW 0 - 10 |
| Friday Night | W 0 - 10 |
| Saturday Morning | WSW 0 - 10 |
| Saturday Afternoon | W 0 - 10 |
| Mt. Hood | Elevation |
|---|---|
| Friday Evening | W 5 - 15 |
| Friday Night | W 10 - 20 |
| Saturday Morning | W 10 - 20 |
| Saturday Afternoon | W 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Friday Evening | W 0 - 10 |
| Friday Night | W 0 - 10 |
| Saturday Morning | WSW 0 - 10 |
| Saturday Afternoon | W 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Friday Evening | SW 0 - 10 |
| Friday Night | W 0 - 10 |
| Saturday Morning | W 0 - 10 |
| Saturday Afternoon | WSW 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Friday Evening | W 0 - 10 |
| Friday Night | W 5 - 15 |
| Saturday Morning | W 5 - 15 |
| Saturday Afternoon | W 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Friday Evening | WSW 0 - 10 |
| Friday Night | W 0 - 10 |
| Saturday Morning | WSW 0 - 10 |
| Saturday Afternoon | W 0 - 10 |
| Mt. Hood | Direction - Speed |
|---|---|
| Friday Evening | W 5 - 15 |
| Friday Night | W 10 - 20 |
| Saturday Morning | W 10 - 20 |
| Saturday Afternoon | W 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 | |
|---|---|---|---|---|---|
| Friday Evening | W 5 - 15 | W 5 - 15 | W 10 - 20 | W 10 - 20 | W 10 - 20 |
| Friday Night | WNW 10 - 20 | WNW 10 - 20 | WNW 20 - 30 | WNW 20 - 30 | WNW 20 - 30 |
| Saturday Morning | W 10 - 20 | WNW 5 - 15 | WNW 15 - 25 | WNW 15 - 25 | WNW 20 - 30 |
| Saturday Afternoon | WNW 10 - 20 | WNW 10 - 20 | WNW 15 - 25 | WNW 15 - 25 | WNW 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Friday Evening | W 5 - 15 |
| Friday Night | WNW 10 - 20 |
| Saturday Morning | W 10 - 20 |
| Saturday Afternoon | WNW 10 - 20 |
| Washington Pass | Direction - Speed |
|---|---|
| Friday Evening | W 5 - 15 |
| Friday Night | WNW 10 - 20 |
| Saturday Morning | WNW 5 - 15 |
| Saturday Afternoon | WNW 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Friday Evening | W 10 - 20 |
| Friday Night | WNW 20 - 30 |
| Saturday Morning | WNW 15 - 25 |
| Saturday Afternoon | WNW 15 - 25 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Friday Evening | W 10 - 20 |
| Friday Night | WNW 20 - 30 |
| Saturday Morning | WNW 15 - 25 |
| Saturday Afternoon | WNW 15 - 25 |
| Mt. Hood | Direction - Speed |
|---|---|
| Friday Evening | W 10 - 20 |
| Friday Night | WNW 20 - 30 |
| Saturday Morning | WNW 20 - 30 |
| Saturday Afternoon | WNW 15 - 25 |
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: 2:16 PM PST Friday, December 13, 2019
Extended Weather Synopsis for Friday night through Friday
The ridge amplifies and moves eastward Monday, with the ridge axis sliding across our region Monday night. The ridge diverts moisture northward into British Columbia from a moisture-laden system offshore. The warm air ahead of this system raises freezing levels Monday through Tuesday with E flow developing on Monday and intensifying Monday night into Tuesday. Tuesday could bring relatively strong winds through the passes. Monday and Tuesday morning are the best chances for widespread sunshine.
At this time it appears that the main storm system for next week will remain offshore until sometime on Wednesday or early Thursday.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Sunday Night | Freezing Level | 500' - 1500' | 500' - 1500' | 2000' - 3000' | |
| Monday | Freezing Level | 500' - 2500' | 1500' - 3000' | 2500' - 4500' | * |
| Monday Night | Freezing Level | 2000' - 3000' | 2500' - 3500' | 4000' - 5000' | * |
| Tuesday | Freezing Level | 3000' - 4000' | 2500' - 3500' | 3500' - 4500' | * |
| Mt. Baker | Elevation |
|---|---|
| Sunday Night |
Freezing Level 500' - 1500' |
| Monday |
Freezing Level 500' - 2500' (Easterly Flow *) |
| Monday Night |
Freezing Level 2000' - 3000' (Easterly Flow *) |
| Tuesday |
Freezing Level 3000' - 4000' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Night |
Freezing Level 500' - 1500' |
| Monday |
Freezing Level 1500' - 3000' (Easterly Flow *) |
| Monday Night |
Freezing Level 2500' - 3500' (Easterly Flow *) |
| Tuesday |
Freezing Level 2500' - 3500' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Sunday Night |
Freezing Level 2000' - 3000' |
| Monday |
Freezing Level 2500' - 4500' (Easterly Flow *) |
| Monday Night |
Freezing Level 4000' - 5000' (Easterly Flow *) |
| Tuesday |
Freezing Level 3500' - 4500' (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 13, 2019
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