Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Thursday night through Monday
The Pacific Northwest is in the midst of a significant snow producing storm-cycle. A shortwave feature with an active frontal boundary should be passing over and east of the Washington Cascades by Thursday evening. This frontal zone has featured thundersnow and heavy (up to 4" per hour) snowfall rates in the Mt Hood area with heavy snowfall also in the Hurricane Ridge and Mt. Rainier areas as of Thursday afternoon. SW winds ahead of the front shift westerly by evening and should be moderate to strong. Look for sustained moderate to locally heavy snowfall, particularly from the central Washington Cascades southward. Convergence is likely to develop overnight and the Stevens Pass area looks to be favored. Expect significant accumulations and locally intense snow with a spread in potential snowfall amounts. Temperatures should start cooling slightly.
On Friday, light to moderate mountain-induced rain and snow showers will continue as winds gradually decrease, but temperatures will gradually cool. This activity will further decrease Friday night with further cooling. High-resolution weather models maintain convergence in the central Cascades through Friday night.
On Saturday, very light snow showers will bring up to an inch or two of snow to localized locations, but most of the snow should be finished. East of the Cascade Crest, sunshine should be more plentiful.
Weather Forecast
Hurricane Ridge
| Thursday Night | Light rain and snow showers. |
| Friday |
Mt. Baker
| Thursday Night | Light to moderate rain and snow, heaviest in the evening. |
| Friday | Light rain and snow showers. Cooler. |
Washington Pass and Leavenworth
| Thursday Night | Light to moderate rain and snow near the Cascade crest, heaviest in the evening and decreasing eastward. |
| Friday | Light rain and snow showers mainly near the Cascade crest, locally moderate in convergence (central Cascades). Cooler. |
Stevens and Snoqualmie Pass
| Thursday Night | Moderate to heavy rain and snow, heaviest in the evening. Marginally snow for Snoqualmie Pass and all snow for Stevens. Moderate W wind through the Passes. Some convergence developing by morning. |
| Friday | Light to moderate rain and snow showers with heaviest accumulations likely in potentially strong convergence (likely near Stevens Pass). Cooler. Expect additional snow accumulations at the Passes. |
Mt. Rainier, Crystal and White Pass
| Thursday Night | Moderate rain and snow, heaviest at Paradise and lightest at Crystal. |
| Friday | Light to locally moderate rain and snow showers with most accumulations at Paradise and Crystal mostly blocked. |
Mt. Hood
| Thursday Night | Moderate rain and snow. Strong 5000 ft winds. |
| Friday | Decreasing light rain and snow showers. |
Issued: 2:21 PM PST Thursday, December 12, 2019
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Thursday Evening | Snow Level | 3000' | 3000' | 3000' | 3000' | 3000' | 3500' | 3500' | 4000' |
| Thursday Night | Snow Level | 3000' | 2500' | 2500' | 3000' | 3000' | 3000' | 3000' | 3500' |
| Friday Morning | Snow Level | 2500' | 2500' | 2000' | 2500' | 3000' | 3000' | 3000' | 3000' |
| Friday Afternoon | Snow Level | 3000' | 2500' | 2500' | 3000' | 3000' | 3000' | 3000' | 3500' |
| Friday Evening | Snow Level | 2500' | 2000' | 2000' | 2000' | 2500' | 2500' | 2500' | 3000' |
| Friday Night | Snow Level | 2000' | 2000' | 1500' | 1500' | 1500' | 2000' | 1500' | 2500' |
| Saturday Morning | Snow Level | 1500' | 1500' | 1000' | 1000' | 1500' | 2000' | 1000' | 2000' |
| Saturday Afternoon | Snow Level | 2500' | 2000' | 2000' | 2000' | 2000' | 2000' | 2000' | 2500' |
| Hurricane Ridge | Elevation |
|---|---|
| Thursday Evening |
Snow Level 3000' |
| Thursday Night |
Snow Level 3000' |
| Friday Morning |
Snow Level 2500' |
| Friday Afternoon |
Snow Level 3000' |
| Friday Evening |
Snow Level 2500' |
| Friday Night |
Snow Level 2000' |
| Saturday Morning |
Snow Level 1500' |
| Saturday Afternoon |
Snow Level 2500' |
| Mt. Baker | Elevation |
|---|---|
| Thursday Evening |
Snow Level 3000' |
| Thursday Night |
Snow Level 2500' |
| Friday Morning |
Snow Level 2500' |
| Friday Afternoon |
Snow Level 2500' |
| Friday Evening |
Snow Level 2000' |
| Friday Night |
Snow Level 2000' |
| Saturday Morning |
Snow Level 1500' |
| Saturday Afternoon |
Snow Level 2000' |
| Washington Pass | Elevation |
|---|---|
| Thursday Evening |
Snow Level 3000' |
| Thursday Night |
Snow Level 2500' |
| Friday Morning |
Snow Level 2000' |
| Friday Afternoon |
Snow Level 2500' |
| Friday Evening |
Snow Level 2000' |
| Friday Night |
Snow Level 1500' |
| Saturday Morning |
Snow Level 1000' |
| Saturday Afternoon |
Snow Level 2000' |
| Leavenworth | Elevation |
|---|---|
| Thursday Evening |
Snow Level 3000' |
| Thursday Night |
Snow Level 3000' |
| Friday Morning |
Snow Level 2500' |
| Friday Afternoon |
Snow Level 3000' |
| Friday Evening |
Snow Level 2000' |
| Friday Night |
Snow Level 1500' |
| Saturday Morning |
Snow Level 1000' |
| Saturday Afternoon |
Snow Level 2000' |
| Stevens Pass | Elevation |
|---|---|
| Thursday Evening |
Snow Level 3000' |
| Thursday Night |
Snow Level 3000' |
| Friday Morning |
Snow Level 3000' |
| Friday Afternoon |
Snow Level 3000' |
| Friday Evening |
Snow Level 2500' |
| Friday Night |
Snow Level 1500' |
| Saturday Morning |
Snow Level 1500' |
| Saturday Afternoon |
Snow Level 2000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Thursday Evening |
Snow Level 3500' |
| Thursday Night |
Snow Level 3000' |
| Friday Morning |
Snow Level 3000' |
| Friday Afternoon |
Snow Level 3000' |
| Friday Evening |
Snow Level 2500' |
| Friday Night |
Snow Level 2000' |
| Saturday Morning |
Snow Level 2000' |
| Saturday Afternoon |
Snow Level 2000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Thursday Evening |
Snow Level 3500' |
| Thursday Night |
Snow Level 3000' |
| Friday Morning |
Snow Level 3000' |
| Friday Afternoon |
Snow Level 3000' |
| Friday Evening |
Snow Level 2500' |
| Friday Night |
Snow Level 1500' |
| Saturday Morning |
Snow Level 1000' |
| Saturday Afternoon |
Snow Level 2000' |
| Mt. Hood | Elevation |
|---|---|
| Thursday Evening |
Snow Level 4000' |
| Thursday Night |
Snow Level 3500' |
| Friday Morning |
Snow Level 3000' |
| Friday Afternoon |
Snow Level 3500' |
| Friday Evening |
Snow Level 3000' |
| Friday Night |
Snow Level 2500' |
| Saturday Morning |
Snow Level 2000' |
| Saturday Afternoon |
Snow Level 2500' |
* 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
| Thursday Night | Monday | Monday Night | Monday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | LT 0.25 | LT 0.10 | 0 | 0 |
| Mt Baker Ski Area | 0.50 | LT 0.10 | LT 0.10 | LT 0.10 |
| Washington Pass | 0.25 | LT 0.10 | LT 0.10 | LT 0.10 |
| Leavenworth | LT 0.10 | 0 | 0 | 0 |
| Stevens Pass | 0.75 | 0.25 - 0.50 | 0.25 | LT 0.10 |
| Snoqualmie Pass | 0.75 | 0.25 | 0.25 | LT 0.25 |
| Mission Ridge | LT 0.25 | 0 | 0 | 0 |
| Crystal Mt | 0.25 | LT 0.10 | LT 0.10 | LT 0.10 |
| Paradise | 1.00 | 0.25 | LT 0.10 | LT 0.10 |
| White Pass | 0.50 - 0.75 | 0.25 | LT 0.10 | LT 0.10 |
| Mt Hood Meadows | 1.00 | 0.25 | LT 0.10 | LT 0.10 |
| Timberline | 1.00 | 0.25 | LT 0.10 | LT 0.10 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Thursday Night | LT 0.25 |
| Monday | LT 0.10 |
| Monday Night | 0 |
| Monday | 0 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Thursday Night | 0.50 |
| Monday | LT 0.10 |
| Monday Night | LT 0.10 |
| Monday | LT 0.10 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Thursday Night | 0.25 |
| Monday | LT 0.10 |
| Monday Night | LT 0.10 |
| Monday | LT 0.10 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Thursday Night | LT 0.10 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Thursday Night | 0.75 |
| Monday | 0.25 - 0.50 |
| Monday Night | 0.25 |
| Monday | LT 0.10 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Thursday Night | 0.75 |
| Monday | 0.25 |
| Monday Night | 0.25 |
| Monday | LT 0.25 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Thursday Night | LT 0.25 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Thursday Night | 0.25 |
| Monday | LT 0.10 |
| Monday Night | LT 0.10 |
| Monday | LT 0.10 |
| Paradise | Precipitation Forecast |
|---|---|
| Thursday Night | 1.00 |
| Monday | 0.25 |
| Monday Night | LT 0.10 |
| Monday | LT 0.10 |
| White Pass | Precipitation Forecast |
|---|---|
| Thursday Night | 0.50 - 0.75 |
| Monday | 0.25 |
| Monday Night | LT 0.10 |
| Monday | LT 0.10 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Thursday Night | 1.00 |
| Monday | 0.25 |
| Monday Night | LT 0.10 |
| Monday | LT 0.10 |
| Timberline | Precipitation Forecast |
|---|---|
| Thursday Night | 1.00 |
| Monday | 0.25 |
| Monday Night | LT 0.10 |
| 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: 2:21 PM PST Thursday, December 12, 2019
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Thursday Evening | WSW 15 - 25 | WSW 15 - 25 | W 25 - 35 | W 15 - 25 | W 35 - 45 |
| Thursday Night | WSW 10 - 20 | WSW 10 - 20 | W 20 - 30 | WSW 15 - 25 | WSW 30 - 40 |
| Friday Morning | SW 5 - 15 | SW 5 - 15 | WSW 15 - 25 | W 10 - 20 | WSW 20 - 30 |
| Friday Afternoon | WSW 5 - 15 | WSW 5 - 15 | WSW 10 - 20 | WSW 5 - 15 | W 10 - 20 |
| Hurricane Ridge | Elevation |
|---|---|
| Thursday Evening | WSW 15 - 25 |
| Thursday Night | WSW 10 - 20 |
| Friday Morning | SW 5 - 15 |
| Friday Afternoon | WSW 5 - 15 |
| Mt. Baker | Elevation |
|---|---|
| Thursday Evening | WSW 15 - 25 |
| Thursday Night | WSW 10 - 20 |
| Friday Morning | SW 5 - 15 |
| Friday Afternoon | WSW 5 - 15 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Thursday Evening | W 25 - 35 |
| Thursday Night | W 20 - 30 |
| Friday Morning | WSW 15 - 25 |
| Friday Afternoon | WSW 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Thursday Evening | W 15 - 25 |
| Thursday Night | WSW 15 - 25 |
| Friday Morning | W 10 - 20 |
| Friday Afternoon | WSW 5 - 15 |
| Mt. Hood | Elevation |
|---|---|
| Thursday Evening | W 35 - 45 |
| Thursday Night | WSW 30 - 40 |
| Friday Morning | WSW 20 - 30 |
| Friday Afternoon | W 10 - 20 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Thursday Evening | WSW 15 - 25 |
| Thursday Night | WSW 10 - 20 |
| Friday Morning | SW 5 - 15 |
| Friday Afternoon | WSW 5 - 15 |
| Mt. Baker | Direction - Speed |
|---|---|
| Thursday Evening | WSW 15 - 25 |
| Thursday Night | WSW 10 - 20 |
| Friday Morning | SW 5 - 15 |
| Friday Afternoon | WSW 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Thursday Evening | W 25 - 35 |
| Thursday Night | W 20 - 30 |
| Friday Morning | WSW 15 - 25 |
| Friday Afternoon | WSW 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Thursday Evening | W 15 - 25 |
| Thursday Night | WSW 15 - 25 |
| Friday Morning | W 10 - 20 |
| Friday Afternoon | WSW 5 - 15 |
| Mt. Hood | Direction - Speed |
|---|---|
| Thursday Evening | W 35 - 45 |
| Thursday Night | WSW 30 - 40 |
| Friday Morning | WSW 20 - 30 |
| Friday 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 | |
|---|---|---|---|---|---|
| Thursday Evening | W 20 - 30 | W 25 - 35 | W 35 - 45 | W 35 - 45 | W 40 - 55 |
| Thursday Night | W 20 - 30 | W 30 - 40 | W 30 - 40 | W 30 - 40 | WNW 40 - 50 |
| Friday Morning | W 15 - 25 | WSW 25 - 35 | WSW 20 - 30 | WSW 20 - 30 | W 20 - 30 |
| Friday Afternoon | W 10 - 20 | WNW 10 - 20 | W 20 - 30 | W 15 - 25 | W 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Thursday Evening | W 20 - 30 |
| Thursday Night | W 20 - 30 |
| Friday Morning | W 15 - 25 |
| Friday Afternoon | W 10 - 20 |
| Washington Pass | Direction - Speed |
|---|---|
| Thursday Evening | W 25 - 35 |
| Thursday Night | W 30 - 40 |
| Friday Morning | WSW 25 - 35 |
| Friday Afternoon | WNW 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Thursday Evening | W 35 - 45 |
| Thursday Night | W 30 - 40 |
| Friday Morning | WSW 20 - 30 |
| Friday Afternoon | W 20 - 30 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Thursday Evening | W 35 - 45 |
| Thursday Night | W 30 - 40 |
| Friday Morning | WSW 20 - 30 |
| Friday Afternoon | W 15 - 25 |
| Mt. Hood | Direction - Speed |
|---|---|
| Thursday Evening | W 40 - 55 |
| Thursday Night | WNW 40 - 50 |
| Friday Morning | W 20 - 30 |
| Friday Afternoon | W 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: 2:21 PM PST Thursday, December 12, 2019
Extended Weather Synopsis for Monday night through Monday
Saturday night, NW flow brings cold temperatures and snow flurries.
A weak shortwave feature may clip the area, bringing very light rain and snow on Sunday.
A ridge developing offshore pushes into our coastal waters, reducing the likelihood of precipitation Sunday night into Monday.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Saturday Night | Snow Level | 500' - 1500' | 500' - 1500' | 2000' - 3000' | |
| Sunday | Snow Level | 0' - 1000' | 500' - 1500' | 1500' - 2500' | |
| Sunday Night | Freezing Level | 1000' - 2000' | 1500' - 2500' | 2500' - 3500' | |
| Monday | Freezing Level | 1000' - 2000' | 1500' - 2500' | 3000' - 4000' |
| Mt. Baker | Elevation |
|---|---|
| Saturday Night |
Snow Level 500' - 1500' |
| Sunday |
Snow Level 0' - 1000' |
| Sunday Night |
Freezing Level 1000' - 2000' |
| Monday |
Freezing Level 1000' - 2000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Saturday Night |
Snow Level 500' - 1500' |
| Sunday |
Snow Level 500' - 1500' |
| Sunday Night |
Freezing Level 1500' - 2500' |
| Monday |
Freezing Level 1500' - 2500' |
| Mt. Hood | Elevation |
|---|---|
| Saturday Night |
Snow Level 2000' - 3000' |
| Sunday |
Snow Level 1500' - 2500' |
| Sunday Night |
Freezing Level 2500' - 3500' |
| Monday |
Freezing Level 3000' - 4000' |
* 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 12, 2019
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