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
Cool NW flow has exceeded post-frontal snowfall accumulations in a few areas along the west slopes of the Cascades through early this afternoon. Those same areas, from Stevens Pass/Mountain Loop and south to Mt. Hood, will continue to see persistent snow showers through the early evening. It won't be until the flow aloft turns more northerly this evening that the showers really wind.
Upper level ridging will build offshore and conditions will dry out tonight with clear skies expected in most locations. Some low clouds may get pulled into the Cascade Passes as light east flow develops. Other than the aforementioned low clouds in the Passes and some high clouds coming over the Olymipcs/north Cascades in the afternoon, generally sunny skies and cool temperatures are forecast on Monday.
The upper level ridge will begin to flop over into southern B.C. on Tuesday, allowing more high clouds from a weak frontal boundary to push further south. Periods of high clouds are likely for northern half of the forecast area Monday night and Tuesday with diminishing cloud cover for areas further south. Freezing levels will begin to moderate Tuesday as warmer air works over the region.
Weather Forecast
Hurricane Ridge
| Sunday Night | Mostly clear. |
| Monday | Mostly sunny and cool. High clouds increasing midday. |
Mt. Baker
| Sunday Night | Partly cloudy in the evening, becoming mostly clear overnight. |
| Monday | Mostly sunny and cool. High clouds increasing in the afternoon. |
Washington Pass and Leavenworth
| Sunday Night | Mostly cloudy with scattered snow showers near the Cascade crest, mostly clear further east. Becoming mostly clear all areas overnight. |
| Monday | Mostly sunny and cool. Periods of high clouds in the afternoon. |
Stevens and Snoqualmie Pass
| Sunday Night | Light to occasionally moderate snow showers ending early in the evening and becoming partly cloudy overnight with areas of low clouds. Light west wind in the Passes becoming light east overnight. |
| Monday | Areas of low clouds in the morning, otherwise mostly sunny and cool. Periods of high clouds in the afternoon. Light east wind in the Passes. |
Mt. Rainier, Crystal and White Pass
| Sunday Night | Light to occasionally moderate snow showers ending early in the evening and becoming partly cloudy overnight. |
| Monday | Mostly sunny and cool. |
Mt. Hood
| Sunday Night | Light to occasionally moderate snow showers ending in the evening and becoming mostly cloudy after midnight. |
| Monday | Mostly sunny and cool. |
Issued: 2:13 PM PST Sunday, December 30, 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 | 1500' | 1000' | 1000' | 1000' | 1500' | 1500' | 1500' | 2500' |
| Sunday Night | Freezing Level | 1500' | 500' | 0' | 500' | 500' | 1000' | 1000' | 2000' |
| Monday Morning | Freezing Level | 1500' | 500' | 0' | 500' | 500' | 1000' | 1000' | 2000' |
| Monday Afternoon | Freezing Level | 3000' | 1500' | 1500' | 1500' | 1500' | 1500' | 2000' | 2000' |
| Monday Evening | Freezing Level | 3000' | 1000' | 500' | 1000' | 1000' | 1000' | 2000' | 2000' |
| Monday Night | Freezing Level | 3000' | 1000' | 0' | 1000' | 1000' | 1000' | 2000' | 2000' |
| Tuesday Morning | Freezing Level | 3000' | 1500' | 1000' | 1500' | 1500' | 1500' | 2500' | 2500' |
| Tuesday Afternoon | Freezing Level | 4500' | 3000' | 3000' | 3000' | 3500' | 3500' | 4000' | 5500' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Evening |
Snow Level 1500' |
| Sunday Night |
Freezing Level 1500' |
| Monday Morning |
Freezing Level 1500' |
| Monday Afternoon |
Freezing Level 3000' |
| Monday Evening |
Freezing Level 3000' |
| Monday Night |
Freezing Level 3000' |
| Tuesday Morning |
Freezing Level 3000' |
| Tuesday Afternoon |
Freezing Level 4500' |
| Mt. Baker | Elevation |
|---|---|
| Sunday Evening |
Snow Level 1000' |
| Sunday Night |
Freezing Level 500' |
| Monday Morning |
Freezing Level 500' |
| Monday Afternoon |
Freezing Level 1500' |
| Monday Evening |
Freezing Level 1000' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 1500' |
| Tuesday Afternoon |
Freezing Level 3000' |
| Washington Pass | Elevation |
|---|---|
| Sunday Evening |
Snow Level 1000' |
| Sunday Night |
Freezing Level 0' |
| Monday Morning |
Freezing Level 0' |
| Monday Afternoon |
Freezing Level 1500' |
| Monday Evening |
Freezing Level 500' |
| Monday Night |
Freezing Level 0' |
| Tuesday Morning |
Freezing Level 1000' |
| Tuesday Afternoon |
Freezing Level 3000' |
| Leavenworth | Elevation |
|---|---|
| Sunday Evening |
Snow Level 1000' |
| Sunday Night |
Freezing Level 500' |
| Monday Morning |
Freezing Level 500' |
| Monday Afternoon |
Freezing Level 1500' |
| Monday Evening |
Freezing Level 1000' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 1500' |
| Tuesday Afternoon |
Freezing Level 3000' |
| Stevens Pass | Elevation |
|---|---|
| Sunday Evening |
Snow Level 1500' |
| Sunday Night |
Freezing Level 500' |
| Monday Morning |
Freezing Level 500' |
| Monday Afternoon |
Freezing Level 1500' |
| Monday Evening |
Freezing Level 1000' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 1500' |
| Tuesday Afternoon |
Freezing Level 3500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Evening |
Snow Level 1500' |
| Sunday Night |
Freezing Level 1000' |
| Monday Morning |
Freezing Level 1000' |
| Monday Afternoon |
Freezing Level 1500' |
| Monday Evening |
Freezing Level 1000' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 1500' |
| Tuesday Afternoon |
Freezing Level 3500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Evening |
Snow Level 1500' |
| Sunday Night |
Freezing Level 1000' |
| Monday Morning |
Freezing Level 1000' |
| Monday Afternoon |
Freezing Level 2000' |
| Monday Evening |
Freezing Level 2000' |
| Monday Night |
Freezing Level 2000' |
| Tuesday Morning |
Freezing Level 2500' |
| Tuesday Afternoon |
Freezing Level 4000' |
| Mt. Hood | Elevation |
|---|---|
| Sunday Evening |
Snow Level 2500' |
| Sunday Night |
Freezing Level 2000' |
| Monday Morning |
Freezing Level 2000' |
| Monday Afternoon |
Freezing Level 2000' |
| Monday Evening |
Freezing Level 2000' |
| Monday Night |
Freezing Level 2000' |
| Tuesday Morning |
Freezing Level 2500' |
| Tuesday Afternoon |
Freezing Level 5500' |
* 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 | 0 | 0 | 0 | 0 |
| Mt Baker Ski Area | 0 | 0 | 0 | 0 |
| Washington Pass | 0 | 0 | 0 | 0 |
| Leavenworth | 0 | 0 | 0 | 0 |
| Stevens Pass | LT 0.10 | 0 | 0 | 0 |
| Snoqualmie Pass | LT 0.10 | 0 | 0 | 0 |
| Mission Ridge | 0 | 0 | 0 | 0 |
| Crystal Mt | LT 0.10 | 0 | 0 | 0 |
| Paradise | LT 0.10 | 0 | 0 | 0 |
| White Pass | 0 | 0 | 0 | 0 |
| Mt Hood Meadows | LT 0.10 | 0 | 0 | 0 |
| Timberline | LT 0.10 | 0 | 0 | 0 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Thursday | 0 |
| 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 | LT 0.10 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| White Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Thursday | 0 |
| Thursday Night | 0 |
| Thursday | 0 |
| Timberline | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Thursday | 0 |
| Thursday Night | 0 |
| 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: 2:13 PM PST Sunday, December 30, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Evening | N 10 - 20 | NE 10 - 20 | NW 5 - 15 | N 10 - 20 | NW 15 - 25 |
| Sunday Night | NE 5 - 15 | NE 5 - 15 | NE 0 - 10 | NE 0 - 10 | NE 5 - 15 |
| Monday Morning | NE 0 - 10 | NE 0 - 10 | E 0 - 10 | VAR 0 - 10 | ENE 5 - 15 |
| Monday Afternoon | NW 0 - 10 | VAR 0 - 10 | VAR 0 - 10 | VAR 0 - 10 | E 0 - 10 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Evening | N 10 - 20 |
| Sunday Night | NE 5 - 15 |
| Monday Morning | NE 0 - 10 |
| Monday Afternoon | NW 0 - 10 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Evening | NE 10 - 20 |
| Sunday Night | NE 5 - 15 |
| Monday Morning | NE 0 - 10 |
| Monday Afternoon | VAR 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Evening | NW 5 - 15 |
| Sunday Night | NE 0 - 10 |
| Monday Morning | E 0 - 10 |
| Monday Afternoon | VAR 0 - 10 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Evening | N 10 - 20 |
| Sunday Night | NE 0 - 10 |
| Monday Morning | VAR 0 - 10 |
| Monday Afternoon | VAR 0 - 10 |
| Mt. Hood | Elevation |
|---|---|
| Sunday Evening | NW 15 - 25 |
| Sunday Night | NE 5 - 15 |
| Monday Morning | ENE 5 - 15 |
| Monday Afternoon | E 0 - 10 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Evening | N 10 - 20 |
| Sunday Night | NE 5 - 15 |
| Monday Morning | NE 0 - 10 |
| Monday Afternoon | NW 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Evening | NE 10 - 20 |
| Sunday Night | NE 5 - 15 |
| Monday Morning | NE 0 - 10 |
| Monday Afternoon | VAR 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Evening | NW 5 - 15 |
| Sunday Night | NE 0 - 10 |
| Monday Morning | E 0 - 10 |
| Monday Afternoon | VAR 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Evening | N 10 - 20 |
| Sunday Night | NE 0 - 10 |
| Monday Morning | VAR 0 - 10 |
| Monday Afternoon | VAR 0 - 10 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Evening | NW 15 - 25 |
| Sunday Night | NE 5 - 15 |
| Monday Morning | ENE 5 - 15 |
| Monday Afternoon | E 0 - 10 |
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 | NNE 20 - 30 | N 25 - 35 | N 15 - 25 | N 20 - 30 | N 20 - 30 |
| Sunday Night | N 15 - 25 | N 10 - 20 | N 15 - 25 | N 15 - 25 | N 20 - 30 |
| Monday Morning | NNW 15 - 25 | NNW 15 - 25 | N 15 - 25 | N 15 - 25 | NNE 20 - 30 |
| Monday Afternoon | NNW 15 - 25 | NNW 20 - 30 | NNW 20 - 30 | N 20 - 30 | NNE 20 - 30 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Evening | NNE 20 - 30 |
| Sunday Night | N 15 - 25 |
| Monday Morning | NNW 15 - 25 |
| Monday Afternoon | NNW 15 - 25 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Evening | N 25 - 35 |
| Sunday Night | N 10 - 20 |
| Monday Morning | NNW 15 - 25 |
| Monday Afternoon | NNW 20 - 30 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Evening | N 15 - 25 |
| Sunday Night | N 15 - 25 |
| Monday Morning | N 15 - 25 |
| Monday Afternoon | NNW 20 - 30 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Evening | N 20 - 30 |
| Sunday Night | N 15 - 25 |
| Monday Morning | N 15 - 25 |
| Monday Afternoon | N 20 - 30 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Evening | N 20 - 30 |
| Sunday Night | N 20 - 30 |
| Monday Morning | NNE 20 - 30 |
| Monday Afternoon | NNE 20 - 30 |
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: 2:13 PM PST Sunday, December 30, 2018
Extended Weather Synopsis for Thursday night through Thursday
The ridge will begin to flatten over the area Tuesday night and Wednesday, allowing more clouds and eventually some light rain and snow into the Olympics and north Cascades by Wednesday afternoon. Forecast models generally agree that a moisture-laden warm front will spill into the Olympics and Washington Cascades Wednesday night, before lifting north on Thursday. Snow levels should rise dramatically Wednesday night into Thursday.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Tuesday Night | Freezing Level | 2500' - 3500' | 2500' - 3500' | 5500' - 6500' | |
| Wednesday | Snow Level | 3500' - 4500' | 4500' - 5500' | 6500' - 7500' | |
| Wednesday Night | Snow Level | 3500' - 4500' | 5500' - 6500' | 6500' - 7500' | |
| Thursday | Snow Level | 6000' - 7000' | 6500' - 7500' | 7000' - 8000' |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Night |
Freezing Level 2500' - 3500' |
| Wednesday |
Snow Level 3500' - 4500' |
| Wednesday Night |
Snow Level 3500' - 4500' |
| Thursday |
Snow Level 6000' - 7000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Night |
Freezing Level 2500' - 3500' |
| Wednesday |
Snow Level 4500' - 5500' |
| Wednesday Night |
Snow Level 5500' - 6500' |
| Thursday |
Snow Level 6500' - 7500' |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Night |
Freezing Level 5500' - 6500' |
| Wednesday |
Snow Level 6500' - 7500' |
| Wednesday Night |
Snow Level 6500' - 7500' |
| Thursday |
Snow Level 7000' - 8000' |
* 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 30, 2018
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