Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Sunday night through Wednesday
A weak frontal system that dissipated over the coast this afternoon has given way to abundant sunshine and mild freezing levels for the Olympics and west slopes of Cascades. The Passes have largely stayed socked in as low clouds have been pulled through the main mountain gaps with moderate easterly flow and pass level winds. There was a notable 13F difference between the east and west side of Stevens Pass ski resort this afternoon at roughly the same elevation.
Skies should remain mostly clear on the west side of the crest tonight with the same areas of low clouds for the Passes and east slopes. Light warm frontal moisture should brush mainly the north Cascades and Olympics on Monday with increasing clouds of the central and south Washington Cascades in the afternoon.
The real action will begin late Monday night into Tuesday as the upper level ridging over the region begins to buckle and open the door for a 160 kt jet. Strong WNW flow aloft will force milder air into the region during the day Tuesday. Strong east flow through the Cascade Passes should help keep low snow levels initially, but we may see a period of freezing rain during the transition period Tuesday afternoon. In general, expect storm conditions with rising snow levels for all locations by Tuesday afternoon.
Weather Forecast
Hurricane Ridge
| Sunday Night | Partly cloudy, becoming mostly cloudy after midnight. |
| Monday | Cloudy with periods of light rain and snow. |
Mt. Baker
| Sunday Night | Mostly clear becoming partly cloudy after midnight. |
| Monday | Cloudy with periods of light rain and snow. |
Washington Pass and Leavenworth
| Sunday Night | Mostly clear becoming partly cloudy after midnight. Areas of low clouds valleys and lower slopes. |
| Monday | Becoming cloudy with periods of light rain and snow near the Cascade crest. |
Stevens and Snoqualmie Pass
| Sunday Night | Mostly cloudy with areas of low clouds and fog. Light to moderate east winds in the Passes decreasing overnight. |
| Monday | Cloudy with periods of light rain and snow in the afternoon. |
Mt. Rainier, Crystal and White Pass
| Sunday Night | Partly to mostly clear. |
| Monday | Partly cloudy in the morning, then cloudy with periods of light rain and snow in the afternoon. |
Mt. Hood
| Sunday Night | Partly to mostly clear. |
| Monday | Mostly sunny in the morning with increasing high clouds in the afternoon. |
Issued: 1:58 PM PST Sunday, December 29, 2019
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Sunday Evening | Freezing Level * | 6000' | 5000' | 2500' | 2500' | 3500' | 4500' | 4500' | 4000' |
| Sunday Night | Freezing Level * | 5500' | 5000' | 2500' | 2500' | 3500' | 4500' | 4500' | 4000' |
| Monday Morning | Snow Level * | 4500' | 4000' | 4000' | 3000' | 4000' | 4000' | 4500' | 3500' |
| Monday Afternoon | Snow Level | 4000' | 4000' | 4000' | 3000' | 4000' | 4000' | 4500' | 4500' |
| Monday Evening | Snow Level | 4500' | 3000' | 2000' | 2000' | 3000' | 3000' | 3500' | 5500' |
| Monday Night | Snow Level | 5500' | 3500' | 2000' | 2000' | 3000' | 3000' | 3500' | 5500' |
| Tuesday Morning | Snow Level * | 6000' | 4000' | 3000' | 3500' | 3500' | 5000' | 4500' | 6000' |
| Tuesday Afternoon | Snow Level * | 7500' | 4500' | 3000' | 4500' | 4500' | 6500' | 6000' | 6000' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 6000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 5500' (Easterly Flow *) |
| Monday Morning |
Snow Level 4500' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 4000' |
| Monday Evening |
Snow Level 4500' |
| Monday Night |
Snow Level 5500' |
| Tuesday Morning |
Snow Level 6000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 7500' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 5000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 5000' (Easterly Flow *) |
| Monday Morning |
Snow Level 4000' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 4000' |
| Monday Evening |
Snow Level 3000' |
| Monday Night |
Snow Level 3500' |
| Tuesday Morning |
Snow Level 4000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 4500' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 2500' (Easterly Flow *) |
| Sunday Night |
Freezing Level 2500' (Easterly Flow *) |
| Monday Morning |
Snow Level 4000' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 4000' |
| Monday Evening |
Snow Level 2000' |
| Monday Night |
Snow Level 2000' |
| Tuesday Morning |
Snow Level 3000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 3000' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 2500' (Easterly Flow *) |
| Sunday Night |
Freezing Level 2500' (Easterly Flow *) |
| Monday Morning |
Snow Level 3000' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 3000' |
| Monday Evening |
Snow Level 2000' |
| Monday Night |
Snow Level 2000' |
| Tuesday Morning |
Snow Level 3500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 4500' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 3500' (Easterly Flow *) |
| Sunday Night |
Freezing Level 3500' (Easterly Flow *) |
| Monday Morning |
Snow Level 4000' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 4000' |
| Monday Evening |
Snow Level 3000' |
| Monday Night |
Snow Level 3000' |
| Tuesday Morning |
Snow Level 3500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 4500' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 4500' (Easterly Flow *) |
| Sunday Night |
Freezing Level 4500' (Easterly Flow *) |
| Monday Morning |
Snow Level 4000' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 4000' |
| Monday Evening |
Snow Level 3000' |
| Monday Night |
Snow Level 3000' |
| Tuesday Morning |
Snow Level 5000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 6500' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 4500' (Easterly Flow *) |
| Sunday Night |
Freezing Level 4500' (Easterly Flow *) |
| Monday Morning |
Snow Level 4500' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 4500' |
| Monday Evening |
Snow Level 3500' |
| Monday Night |
Snow Level 3500' |
| Tuesday Morning |
Snow Level 4500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 6000' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Sunday Evening |
Freezing Level 4000' (Easterly Flow *) |
| Sunday Night |
Freezing Level 4000' (Easterly Flow *) |
| Monday Morning |
Snow Level 3500' (Easterly Flow *) |
| Monday Afternoon |
Snow Level 4500' |
| Monday Evening |
Snow Level 5500' |
| Monday Night |
Snow Level 5500' |
| Tuesday Morning |
Snow Level 6000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 6000' (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
| Sunday Night | Wednesday | Wednesday Night | Wednesday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | LT 0.10 | LT 0.10 | LT 0.10 | 0.50 |
| Mt Baker Ski Area | 0 | LT 0.10 | LT 0.25 | 1.00 |
| Washington Pass | 0 | LT 0.10 | LT 0.10 | 0.25 - 0.50 |
| Leavenworth | 0 | 0 | 0 | 0.25 |
| Stevens Pass | 0 | LT 0.10 | LT 0.10 | 0.75 |
| Snoqualmie Pass | 0 | LT 0.10 | LT 0.10 | 0.75 -1.00 |
| Mission Ridge | 0 | 0 | 0 | LT 0.25 |
| Crystal Mt | 0 | LT 0.10 | LT 0.10 | 0.25 - 0.50 |
| Paradise | 0 | LT 0.10 | LT 0.10 | 0.75 |
| White Pass | 0 | 0 | LT 0.10 | 0.50 |
| Mt Hood Meadows | 0 | 0 | 0 | 0.25 |
| Timberline | 0 | 0 | 0 | 0.25 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Wednesday | LT 0.10 |
| Wednesday Night | LT 0.10 |
| Wednesday | 0.50 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Wednesday | LT 0.10 |
| Wednesday Night | LT 0.25 |
| Wednesday | 1.00 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Wednesday | LT 0.10 |
| Wednesday Night | LT 0.10 |
| Wednesday | 0.25 - 0.50 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Wednesday | 0 |
| Wednesday Night | 0 |
| Wednesday | 0.25 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Wednesday | LT 0.10 |
| Wednesday Night | LT 0.10 |
| Wednesday | 0.75 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Wednesday | LT 0.10 |
| Wednesday Night | LT 0.10 |
| Wednesday | 0.75 -1.00 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Wednesday | 0 |
| Wednesday Night | 0 |
| Wednesday | LT 0.25 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Wednesday | LT 0.10 |
| Wednesday Night | LT 0.10 |
| Wednesday | 0.25 - 0.50 |
| Paradise | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Wednesday | LT 0.10 |
| Wednesday Night | LT 0.10 |
| Wednesday | 0.75 |
| White Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Wednesday | 0 |
| Wednesday Night | LT 0.10 |
| Wednesday | 0.50 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Wednesday | 0 |
| Wednesday Night | 0 |
| Wednesday | 0.25 |
| Timberline | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Wednesday | 0 |
| Wednesday Night | 0 |
| Wednesday | 0.25 |
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: 1:58 PM PST Sunday, December 29, 2019
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Evening | SW 0 - 10 | S 0 - 10 | NW 5 - 15 | NW 0 - 10 | VAR 0 - 10 |
| Sunday Night | SW 0 - 10 | SW 0 - 10 | NW 5 - 15 | NW 5 - 15 | NW 5 - 15 |
| Monday Morning | SW 5 - 15 | SW 0 - 10 | NW 10 - 20 | WNW 5 - 15 | NW 5 - 15 |
| Monday Afternoon | WSW 5 - 15 | W 10 - 20 | W 15 - 25 | W 10 - 20 | NW 10 - 20 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Evening | SW 0 - 10 |
| Sunday Night | SW 0 - 10 |
| Monday Morning | SW 5 - 15 |
| Monday Afternoon | WSW 5 - 15 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Evening | S 0 - 10 |
| Sunday Night | SW 0 - 10 |
| Monday Morning | SW 0 - 10 |
| Monday Afternoon | W 10 - 20 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Evening | NW 5 - 15 |
| Sunday Night | NW 5 - 15 |
| Monday Morning | NW 10 - 20 |
| Monday Afternoon | W 15 - 25 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Evening | NW 0 - 10 |
| Sunday Night | NW 5 - 15 |
| Monday Morning | WNW 5 - 15 |
| Monday Afternoon | W 10 - 20 |
| Mt. Hood | Elevation |
|---|---|
| Sunday Evening | VAR 0 - 10 |
| Sunday Night | NW 5 - 15 |
| Monday Morning | NW 5 - 15 |
| Monday Afternoon | NW 10 - 20 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Evening | SW 0 - 10 |
| Sunday Night | SW 0 - 10 |
| Monday Morning | SW 5 - 15 |
| Monday Afternoon | WSW 5 - 15 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Evening | S 0 - 10 |
| Sunday Night | SW 0 - 10 |
| Monday Morning | SW 0 - 10 |
| Monday Afternoon | W 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Evening | NW 5 - 15 |
| Sunday Night | NW 5 - 15 |
| Monday Morning | NW 10 - 20 |
| Monday Afternoon | W 15 - 25 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Evening | NW 0 - 10 |
| Sunday Night | NW 5 - 15 |
| Monday Morning | WNW 5 - 15 |
| Monday Afternoon | W 10 - 20 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Evening | VAR 0 - 10 |
| Sunday Night | NW 5 - 15 |
| Monday Morning | NW 5 - 15 |
| Monday Afternoon | NW 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 | |
|---|---|---|---|---|---|
| Sunday Evening | SW 5 - 15 | SW 0 - 10 | VAR 0 - 10 | VAR 0 - 10 | NE 5 - 15 |
| Sunday Night | WSW 5 - 15 | WSW 5 - 15 | W 0 - 10 | W 5 - 15 | N 0 - 10 |
| Monday Morning | WSW 10 - 20 | WSW 10 - 20 | W 15 - 25 | W 10 - 20 | NW 5 - 15 |
| Monday Afternoon | WNW 20 - 30 | WNW 15 - 25 | WNW 25 - 35 | WNW 25 - 35 | NW 25 - 35 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Evening | SW 5 - 15 |
| Sunday Night | WSW 5 - 15 |
| Monday Morning | WSW 10 - 20 |
| Monday Afternoon | WNW 20 - 30 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Evening | SW 0 - 10 |
| Sunday Night | WSW 5 - 15 |
| Monday Morning | WSW 10 - 20 |
| Monday Afternoon | WNW 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Evening | VAR 0 - 10 |
| Sunday Night | W 0 - 10 |
| Monday Morning | W 15 - 25 |
| Monday Afternoon | WNW 25 - 35 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Evening | VAR 0 - 10 |
| Sunday Night | W 5 - 15 |
| Monday Morning | W 10 - 20 |
| Monday Afternoon | WNW 25 - 35 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Evening | NE 5 - 15 |
| Sunday Night | N 0 - 10 |
| Monday Morning | NW 5 - 15 |
| Monday Afternoon | NW 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: 1:58 PM PST Sunday, December 29, 2019
Extended Weather Synopsis for Wednesday night through Wednesday
Heavier precipitation will likely arrive Tuesday night with a peak in snow levels before a cold front sweeps through. Orographic showers in westerly flow on Wednesday should continue moderate precipitation as snow levels nudge downward during the day. Colder air and continued showers should arrive late Wednesday night through Thursday. The pattern remains active through the end of the week with additional storms likely.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Tuesday Night | Snow Level | 4500' - 6500' | 4500' - 6500' | 6000' - 8000' | |
| Wednesday | Snow Level | 3500' - 4500' | 4000' - 5000' | 4500' - 5500' | |
| Wednesday Night | Snow Level | 1500' - 2500' | 2000' - 3000' | 3000' - 4000' | |
| Thursday | Snow Level | 1000' - 2000' | 1500' - 2500' | 2000' - 3000' |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Night |
Snow Level 4500' - 6500' |
| Wednesday |
Snow Level 3500' - 4500' |
| Wednesday Night |
Snow Level 1500' - 2500' |
| Thursday |
Snow Level 1000' - 2000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Night |
Snow Level 4500' - 6500' |
| Wednesday |
Snow Level 4000' - 5000' |
| Wednesday Night |
Snow Level 2000' - 3000' |
| Thursday |
Snow Level 1500' - 2500' |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Night |
Snow Level 6000' - 8000' |
| Wednesday |
Snow Level 4500' - 5500' |
| Wednesday Night |
Snow Level 3000' - 4000' |
| Thursday |
Snow Level 2000' - 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.
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 29, 2019
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