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 Thursday
Bands of post-frontal snow showers will continue to decrease in intensity Sunday night. As westerly flow diminishes Monday morning, the snow flurries will come to an end.
A zonal jetstream aimed for Southern Oregon on Sunday will enhance winds in the Mt. Hood area Sunday and Sunday night before spawning a rapidly-moving cutoff low that drops SE toward northern California on Monday and Monday evening. Mt. Hood will be located just within the closed low's precipitation shield. Winds will shift easterly as flow wrap around the low. Any chance of snow showers will end Monday night on Mt. Hood.
Tuesday, a shortwave ridge offshore works into the region.
Temperatures will be seasonally cool throughout the time period with a slight cooling trend.
Weather Forecast
Hurricane Ridge
| Sunday Night | Snow showers decreasing with skies partially clearing. Light winds. |
| Monday | Mostly clear skies with low clouds increasing below 3,000 ft. Light wind. |
Mt. Baker
| Sunday Night | Light snow showers decreasing with skies clear at times. Light winds. |
| Monday | Mostly clear. Light winds. |
Washington Pass and Leavenworth
| Sunday Night | Light snow showers decreasing and ending; becoming mostly clear and cold. Light winds. |
| Monday | Mostly sunny. Cool. Light or calm winds. |
Stevens and Snoqualmie Pass
| Sunday Night | Bands of light snow showers decreasing after midnight. Light to moderate winds decreasing. |
| Monday | Snow flurries ending early. Light winds, increasing and becoming easterly in the afternoon. |
Mt. Rainier, Crystal and White Pass
| Sunday Night | Bands of light snow showers decreasing after midnight. Light to moderate winds decreasing. |
| Monday | Snow flurries ending early. Light winds, increasing and becoming easterly in the afternoon. |
Mt. Hood
| Sunday Night | Bands of light to moderate snow showers. Moderate winds decreasing. |
| Monday | Very light snow increasing in the afternoon. Light winds switching to easterly and becoming moderate in the afternoon. |
Issued: 2:06 PM PST Sunday, December 23, 2018
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Sunday Evening | Snow Level | 3000' | 2500' | 2500' | 3000' | 3000' | 3000' | 3500' | 4000' |
| Sunday Night | Snow Level | 3000' | 2000' | 1500' | 2500' | 2500' | 2500' | 2500' | 3500' |
| Monday Morning | Snow Level | 3000' | 2000' | 1000' | 1500' | 2500' | 2500' | 2000' | 3500' |
| Monday Afternoon | Snow Level * | 3000' | 2500' | 2000' | 1500' | 2500' | 3000' | 3000' | 3500' |
| Monday Evening | Snow Level * | 2500' | 2500' | 1000' | 1000' | 1500' | 2000' | 2000' | 2500' |
| Monday Night | Snow Level | 1500' | 0' | 0' | 0' | 0' | 0' | 0' | 2500' |
| Tuesday Morning | Freezing Level | 1000' | 0' | 0' | 500' | 500' | 1000' | 1000' | 2000' |
| Tuesday Afternoon | Freezing Level | 3000' | 2000' | 2500' | 3000' | 3000' | 3000' | 3000' | 3500' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Evening |
Snow Level 3000' |
| Sunday Night |
Snow Level 3000' |
| Monday Morning |
Snow Level 3000' |
| Monday Afternoon |
Snow Level 3000' (Easterly Flow *) |
| Monday Evening |
Snow Level 2500' (Easterly Flow *) |
| Monday Night |
Snow Level 1500' |
| Tuesday Morning |
Freezing Level 1000' |
| Tuesday Afternoon |
Freezing Level 3000' |
| Mt. Baker | Elevation |
|---|---|
| Sunday Evening |
Snow Level 2500' |
| Sunday Night |
Snow Level 2000' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 2500' (Easterly Flow *) |
| Monday Evening |
Snow Level 2500' (Easterly Flow *) |
| Monday Night |
Snow Level 0' |
| Tuesday Morning |
Freezing Level 0' |
| Tuesday Afternoon |
Freezing Level 2000' |
| Washington Pass | Elevation |
|---|---|
| Sunday Evening |
Snow Level 2500' |
| Sunday Night |
Snow Level 1500' |
| Monday Morning |
Snow Level 1000' |
| Monday Afternoon |
Snow Level 2000' (Easterly Flow *) |
| Monday Evening |
Snow Level 1000' (Easterly Flow *) |
| Monday Night |
Snow Level 0' |
| Tuesday Morning |
Freezing Level 0' |
| Tuesday Afternoon |
Freezing Level 2500' |
| Leavenworth | Elevation |
|---|---|
| Sunday Evening |
Snow Level 3000' |
| Sunday Night |
Snow Level 2500' |
| Monday Morning |
Snow Level 1500' |
| Monday Afternoon |
Snow Level 1500' (Easterly Flow *) |
| Monday Evening |
Snow Level 1000' (Easterly Flow *) |
| Monday Night |
Snow Level 0' |
| Tuesday Morning |
Freezing Level 500' |
| Tuesday Afternoon |
Freezing Level 3000' |
| Stevens Pass | Elevation |
|---|---|
| Sunday Evening |
Snow Level 3000' |
| Sunday Night |
Snow Level 2500' |
| Monday Morning |
Snow Level 2500' |
| Monday Afternoon |
Snow Level 2500' (Easterly Flow *) |
| Monday Evening |
Snow Level 1500' (Easterly Flow *) |
| Monday Night |
Snow Level 0' |
| Tuesday Morning |
Freezing Level 500' |
| Tuesday Afternoon |
Freezing Level 3000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Evening |
Snow Level 3000' |
| Sunday Night |
Snow Level 2500' |
| Monday Morning |
Snow Level 2500' |
| Monday Afternoon |
Snow Level 3000' (Easterly Flow *) |
| Monday Evening |
Snow Level 2000' (Easterly Flow *) |
| Monday Night |
Snow Level 0' |
| Tuesday Morning |
Freezing Level 1000' |
| Tuesday Afternoon |
Freezing Level 3000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Evening |
Snow Level 3500' |
| Sunday Night |
Snow Level 2500' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 3000' (Easterly Flow *) |
| Monday Evening |
Snow Level 2000' (Easterly Flow *) |
| Monday Night |
Snow Level 0' |
| Tuesday Morning |
Freezing Level 1000' |
| Tuesday Afternoon |
Freezing Level 3000' |
| Mt. Hood | Elevation |
|---|---|
| Sunday Evening |
Snow Level 4000' |
| Sunday Night |
Snow Level 3500' |
| Monday Morning |
Snow Level 3500' |
| Monday Afternoon |
Snow Level 3500' (Easterly Flow *) |
| Monday Evening |
Snow Level 2500' (Easterly Flow *) |
| Monday Night |
Snow Level 2500' |
| Tuesday Morning |
Freezing Level 2000' |
| Tuesday Afternoon |
Freezing Level 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.
Precipitation Forecast
| Sunday Night | Thursday | Thursday Night | Thursday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | LT 0.10 | 0 | 0 | 0 |
| Mt Baker Ski Area | LT 0.25 | LT 0.10 | 0 | 0 |
| Washington Pass | LT 0.10 | LT 0.10 | 0 | 0 |
| Leavenworth | 0 | 0 | 0 | 0 |
| Stevens Pass | 0.25 | LT 0.10 | 0 | 0 |
| Snoqualmie Pass | 0.25 | LT 0.10 | 0 | 0 |
| Mission Ridge | 0 | 0 | 0 | 0 |
| Crystal Mt | LT 0.10 | 0 | 0 | 0 |
| Paradise | 0.25 - 0.50 | LT 0.10 | 0 | 0 |
| White Pass | LT 0.25 | LT 0.10 | 0 | 0 |
| Mt Hood Meadows | 0.50 | 0.25 | LT 0.25 | 0 |
| Timberline | 0.50 | 0.25 | LT 0.25 | 0 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Thursday | LT 0.10 |
| Thursday Night | 0 |
| Thursday | 0 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Thursday | LT 0.10 |
| Thursday Night | 0 |
| Thursday | 0 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0.25 |
| Thursday | LT 0.10 |
| Thursday Night | 0 |
| Thursday | 0 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0.25 |
| Thursday | LT 0.10 |
| Thursday Night | 0 |
| Thursday | 0 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Paradise | Precipitation Forecast |
|---|---|
| Sunday Night | 0.25 - 0.50 |
| Thursday | LT 0.10 |
| Thursday Night | 0 |
| Thursday | 0 |
| White Pass | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Thursday | LT 0.10 |
| Thursday Night | 0 |
| Thursday | 0 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Sunday Night | 0.50 |
| Thursday | 0.25 |
| Thursday Night | LT 0.25 |
| Thursday | 0 |
| Timberline | Precipitation Forecast |
|---|---|
| Sunday Night | 0.50 |
| Thursday | 0.25 |
| Thursday Night | LT 0.25 |
| Thursday | 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: 2:06 PM PST Sunday, December 23, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Evening | SW 5 - 15 | SSW 5 - 15 | WSW 10 - 20 | SW 10 - 20 | WSW 25 - 35 |
| Sunday Night | SW 0 - 10 | SSW 5 - 15 | W 10 - 20 | WSW 5 - 15 | WSW 15 - 25 |
| Monday Morning | E 0 - 10 | S 0 - 10 | W 0 - 10 | VAR 0 - 10 | W 5 - 15 |
| Monday Afternoon | E 5 - 15 | NE 5 - 15 | E 5 - 15 | E 5 - 15 | E 15 - 25 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Evening | SW 5 - 15 |
| Sunday Night | SW 0 - 10 |
| Monday Morning | E 0 - 10 |
| Monday Afternoon | E 5 - 15 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Evening | SSW 5 - 15 |
| Sunday Night | SSW 5 - 15 |
| Monday Morning | S 0 - 10 |
| Monday Afternoon | NE 5 - 15 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Evening | WSW 10 - 20 |
| Sunday Night | W 10 - 20 |
| Monday Morning | W 0 - 10 |
| Monday Afternoon | E 5 - 15 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Evening | SW 10 - 20 |
| Sunday Night | WSW 5 - 15 |
| Monday Morning | VAR 0 - 10 |
| Monday Afternoon | E 5 - 15 |
| Mt. Hood | Elevation |
|---|---|
| Sunday Evening | WSW 25 - 35 |
| Sunday Night | WSW 15 - 25 |
| Monday Morning | W 5 - 15 |
| Monday Afternoon | E 15 - 25 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Evening | SW 5 - 15 |
| Sunday Night | SW 0 - 10 |
| Monday Morning | E 0 - 10 |
| Monday Afternoon | E 5 - 15 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Evening | SSW 5 - 15 |
| Sunday Night | SSW 5 - 15 |
| Monday Morning | S 0 - 10 |
| Monday Afternoon | NE 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Evening | WSW 10 - 20 |
| Sunday Night | W 10 - 20 |
| Monday Morning | W 0 - 10 |
| Monday Afternoon | E 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Evening | SW 10 - 20 |
| Sunday Night | WSW 5 - 15 |
| Monday Morning | VAR 0 - 10 |
| Monday Afternoon | E 5 - 15 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Evening | WSW 25 - 35 |
| Sunday Night | WSW 15 - 25 |
| Monday Morning | W 5 - 15 |
| Monday Afternoon | E 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.
Free Winds at 9000' (mph)
| Mt. Baker | Washington Pass | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Evening | WSW 15 - 25 | WSW 15 - 25 | W 20 - 30 | W 25 - 35 | WSW 45 - 65 |
| Sunday Night | WSW 15 - 25 | WSW 20 - 30 | W 20 - 30 | W 20 - 30 | WSW 35 - 50 |
| Monday Morning | WSW 10 - 20 | WSW 10 - 20 | W 10 - 20 | WSW 10 - 20 | WSW 20 - 30 |
| Monday Afternoon | W 5 - 15 | W 0 - 10 | S 0 - 10 | SE 5 - 15 | SE 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Evening | WSW 15 - 25 |
| Sunday Night | WSW 15 - 25 |
| Monday Morning | WSW 10 - 20 |
| Monday Afternoon | W 5 - 15 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Evening | WSW 15 - 25 |
| Sunday Night | WSW 20 - 30 |
| Monday Morning | WSW 10 - 20 |
| Monday Afternoon | W 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Evening | W 20 - 30 |
| Sunday Night | W 20 - 30 |
| Monday Morning | W 10 - 20 |
| Monday Afternoon | S 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Evening | W 25 - 35 |
| Sunday Night | W 20 - 30 |
| Monday Morning | WSW 10 - 20 |
| Monday Afternoon | SE 5 - 15 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Evening | WSW 45 - 65 |
| Sunday Night | WSW 35 - 50 |
| Monday Morning | WSW 20 - 30 |
| Monday Afternoon | SE 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: 2:06 PM PST Sunday, December 23, 2018
Extended Weather Synopsis for Thursday night through Thursday
A frontal system will break down the short-wave ridge as it approaches our coastline on Tuesday night. The cold frontal passage mid-day will produce light to moderate snow in the mountains Wednesday morning and snow showers behind the front Wednesday afternoon.
The system is anticipated to dig a deeper trough over the intermountain west Wednesday night into Thursday, leaving the Pacific Northwest under a brief period of post-frontal showers, then drying as the flow turns northerly.
The region sits between a trough to the east and a high pressure offshore to the west. Some moisture may spill over the high and impact the region on Friday. Somewhat warmer temperatures are anticipated as the high edges into the region.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Tuesday Night | Freezing Level | 1000' - 3000' | 5000' - 1500' | 1500' - 2500' | |
| Wednesday | Snow Level | 0' - 1000' | 0' - 2000' | 1000' - 2000' | * |
| Wednesday Night | Snow Level | 500' - 1500' | 1000' - 2000' | 1500' - 2500' | |
| Thursday | Snow Level | 0' - 1000' | 1000' - 2000' | 1500' - 2500' |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Night |
Freezing Level 1000' - 3000' |
| Wednesday |
Snow Level 0' - 1000' (Easterly Flow *) |
| Wednesday Night |
Snow Level 500' - 1500' |
| Thursday |
Snow Level 0' - 1000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Night |
Freezing Level 5000' - 1500' |
| Wednesday |
Snow Level 0' - 2000' (Easterly Flow *) |
| Wednesday Night |
Snow Level 1000' - 2000' |
| Thursday |
Snow Level 1000' - 2000' |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Night |
Freezing Level 1500' - 2500' |
| Wednesday |
Snow Level 1000' - 2000' (Easterly Flow *) |
| Wednesday Night |
Snow Level 1500' - 2500' |
| Thursday |
Snow Level 1500' - 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.
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 23, 2018
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