Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Monday night through Monday
5 pm Update: Corrected precipitation type in Weather Forecast for Tuesday.
A transitory upper level ridge will quickly pass through the region tonight, opening the door for mid and high level clouds to spread up from the south. A mature low pressure system well offshore will spin light warm frontal moisture over the area on Tuesday also from south to north during the daylight hours, with the highest snowfall amounts likely in the Mt. Hood area and to a lesser degree the Crystal Mt./Paradise area.
Offshore easterly flow will ramp up quickly overnight through Tuesday and E-SE winds should increase quickly near and west of the Cascade crest from Snoqualmie Pass and southward. The easterly flow will also mute the warming trend during the day for all areas. The associated weak cold front should move through Tuesday night, producing generally light precipitation.
A trailing longwave trough will begin to quick the whole mess through late Wednesday afternoon and Wednesday night. With each round of precipitation in southerly flow, the cold air trapped in and around the Cascades including Mt. Hood will erode with gradually rising snow levels and increased chances for mixed precipitation.
Weather Forecast
Hurricane Ridge
| Monday Night | Increasing mid and high clouds. |
| Tuesday | Cloudy with periods of light rain and snow beginning late morning. |
Mt. Baker
| Monday Night | Increasing mid and high clouds. |
| Tuesday | Cloudy with periods of light snow beginning mid-day. |
Washington Pass and Leavenworth
| Monday Night | Increasing mid and high clouds. |
| Tuesday | Cloudy with periods of light snow beginning late morning. |
Stevens and Snoqualmie Pass
| Monday Night | Increasing mid and high clouds. Light east winds at Pass level becoming moderate after midnight. |
| Tuesday | Cloudy with periods of light snow beginning late morning. Moderate east winds at Pass level with higher gusts for the western approaches. |
Mt. Rainier, Crystal and White Pass
| Monday Night | Increasing mid and high clouds. |
| Tuesday | Light to occasionally moderate snow becoming light snow in the afternoon. Moderate east winds. |
Mt. Hood
| Monday Night | Increasing mid and high clouds, light snow developing late. |
| Tuesday | Moderate snow becoming light snow in the afternoon. Moderate east winds. |
Issued: 5:09 PM PST Monday, January 7, 2019
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Monday Evening | Freezing Level | 1000' | 1000' | 0' | 1000' | 1000' | 1000' | 1000' | 2000' |
| Monday Night | Freezing Level * | 2000' | 1000' | 0' | 500' | 1000' | 1000' | 1500' | 1500' |
| Tuesday Morning | Snow Level * | 1500' | 500' | 0' | 0' | 500' | 500' | 1000' | 1500' |
| Tuesday Afternoon | Snow Level * | 4500' | 1500' | 500' | 500' | 1000' | 1500' | 2000' | 2500' |
| Tuesday Evening | Snow Level * | 6500' | 3500' | 500' | 1000' | 1000' | 2000' | 3000' | 3000' |
| Tuesday Night | Snow Level * | 6000' | 4500' | 1500' | 1500' | 1500' | 2500' | 3500' | 4000' |
| Wednesday Morning | Snow Level * | 5500' | 4500' | 2000' | 2000' | 2500' | 3000' | 4000' | 5000' |
| Wednesday Afternoon | Snow Level * | 5000' | 4500' | 3500' | 3500' | 3500' | 4000' | 4500' | 6000' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Evening |
Freezing Level 1000' |
| Monday Night |
Freezing Level 2000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 1500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 4500' (Easterly Flow *) |
| Tuesday Evening |
Snow Level 6500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 6000' (Easterly Flow *) |
| Wednesday Morning |
Snow Level 5500' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level 5000' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Monday Evening |
Freezing Level 1000' |
| Monday Night |
Freezing Level 1000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 1500' (Easterly Flow *) |
| Tuesday Evening |
Snow Level 3500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 4500' (Easterly Flow *) |
| Wednesday Morning |
Snow Level 4500' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level 4500' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Monday Evening |
Freezing Level 0' |
| Monday Night |
Freezing Level 0' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 0' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 500' (Easterly Flow *) |
| Tuesday Evening |
Snow Level 500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 1500' (Easterly Flow *) |
| Wednesday Morning |
Snow Level 2000' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level 3500' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Monday Evening |
Freezing Level 1000' |
| Monday Night |
Freezing Level 500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 0' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 500' (Easterly Flow *) |
| Tuesday Evening |
Snow Level 1000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 1500' (Easterly Flow *) |
| Wednesday Morning |
Snow Level 2000' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level 3500' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Monday Evening |
Freezing Level 1000' |
| Monday Night |
Freezing Level 1000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 1000' (Easterly Flow *) |
| Tuesday Evening |
Snow Level 1000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 1500' (Easterly Flow *) |
| Wednesday Morning |
Snow Level 2500' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level 3500' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Evening |
Freezing Level 1000' |
| Monday Night |
Freezing Level 1000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 1500' (Easterly Flow *) |
| Tuesday Evening |
Snow Level 2000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 2500' (Easterly Flow *) |
| Wednesday Morning |
Snow Level 3000' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level 4000' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Evening |
Freezing Level 1000' |
| Monday Night |
Freezing Level 1500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 1000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 2000' (Easterly Flow *) |
| Tuesday Evening |
Snow Level 3000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 3500' (Easterly Flow *) |
| Wednesday Morning |
Snow Level 4000' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level 4500' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Monday Evening |
Freezing Level 2000' |
| Monday Night |
Freezing Level 1500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 1500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 2500' (Easterly Flow *) |
| Tuesday Evening |
Snow Level 3000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 4000' (Easterly Flow *) |
| Wednesday Morning |
Snow Level 5000' (Easterly Flow *) |
| Wednesday 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
| Monday Night | Monday | Monday Night | Monday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | 0 | LT 0.10 | LT 0.25 | 0.50 |
| Mt Baker Ski Area | 0 | LT 0.10 | 0.25 - 0.50 | 0.75 |
| Washington Pass | 0 | LT 0.10 | LT 0.25 | 0.25 |
| Leavenworth | 0 | LT 0.25 | LT 0.25 | 0.25 |
| Stevens Pass | 0 | LT 0.25 | LT 0.25 | LT 0.25 |
| Snoqualmie Pass | 0 | 0.25 | LT 0.25 | LT 0.25 |
| Mission Ridge | 0 | 0.25 | 0.25 | LT 0.25 |
| Crystal Mt | 0 | 0.25 - 0.50 | LT 0.25 | 0.25 - 0.50 |
| Paradise | 0 | 0.50 | LT 0.25 | 0.25 - 0.50 |
| White Pass | 0 | 0.25 | LT 0.10 | LT 0.25 |
| Mt Hood Meadows | LT 0.10 | 0.75 | LT 0.25 | 0.25 |
| Timberline | LT 0.10 | 0.75 -1.00 | LT 0.25 | 0.25 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Monday | LT 0.10 |
| Monday Night | LT 0.25 |
| Monday | 0.50 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Monday | LT 0.10 |
| Monday Night | 0.25 - 0.50 |
| Monday | 0.75 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Monday | LT 0.10 |
| Monday Night | LT 0.25 |
| Monday | 0.25 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Monday | LT 0.25 |
| Monday Night | LT 0.25 |
| Monday | 0.25 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Monday | LT 0.25 |
| Monday Night | LT 0.25 |
| Monday | LT 0.25 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Monday | 0.25 |
| Monday Night | LT 0.25 |
| Monday | LT 0.25 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Monday | 0.25 |
| Monday Night | 0.25 |
| Monday | LT 0.25 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Monday | 0.25 - 0.50 |
| Monday Night | LT 0.25 |
| Monday | 0.25 - 0.50 |
| Paradise | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Monday | 0.50 |
| Monday Night | LT 0.25 |
| Monday | 0.25 - 0.50 |
| White Pass | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Monday | 0.25 |
| Monday Night | LT 0.10 |
| Monday | LT 0.25 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Monday Night | LT 0.10 |
| Monday | 0.75 |
| Monday Night | LT 0.25 |
| Monday | 0.25 |
| Timberline | Precipitation Forecast |
|---|---|
| Monday Night | LT 0.10 |
| Monday | 0.75 -1.00 |
| Monday Night | LT 0.25 |
| Monday | 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: 5:09 PM PST Monday, January 7, 2019
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Evening | E 0 - 10 | E 0 - 10 | E 0 - 10 | E 0 - 10 | SE 5 - 15 |
| Monday Night | ESE 10 - 20 | E 5 - 15 | ESE 10 - 20 | ESE 5 - 15 | ESE 10 - 20 |
| Tuesday Morning | ESE 15 - 25 | E 10 - 20 | ESE 20 - 30 | ESE 20 - 30 | ESE 20 - 30 |
| Tuesday Afternoon | SE 15 - 25 | E 10 - 20 | ESE 20 - 30 | ESE 20 - 30 | ESE 20 - 30 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Evening | E 0 - 10 |
| Monday Night | ESE 10 - 20 |
| Tuesday Morning | ESE 15 - 25 |
| Tuesday Afternoon | SE 15 - 25 |
| Mt. Baker | Elevation |
|---|---|
| Monday Evening | E 0 - 10 |
| Monday Night | E 5 - 15 |
| Tuesday Morning | E 10 - 20 |
| Tuesday Afternoon | E 10 - 20 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Evening | E 0 - 10 |
| Monday Night | ESE 10 - 20 |
| Tuesday Morning | ESE 20 - 30 |
| Tuesday Afternoon | ESE 20 - 30 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Evening | E 0 - 10 |
| Monday Night | ESE 5 - 15 |
| Tuesday Morning | ESE 20 - 30 |
| Tuesday Afternoon | ESE 20 - 30 |
| Mt. Hood | Elevation |
|---|---|
| Monday Evening | SE 5 - 15 |
| Monday Night | ESE 10 - 20 |
| Tuesday Morning | ESE 20 - 30 |
| Tuesday Afternoon | ESE 20 - 30 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Evening | E 0 - 10 |
| Monday Night | ESE 10 - 20 |
| Tuesday Morning | ESE 15 - 25 |
| Tuesday Afternoon | SE 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Evening | E 0 - 10 |
| Monday Night | E 5 - 15 |
| Tuesday Morning | E 10 - 20 |
| Tuesday Afternoon | E 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Evening | E 0 - 10 |
| Monday Night | ESE 10 - 20 |
| Tuesday Morning | ESE 20 - 30 |
| Tuesday Afternoon | ESE 20 - 30 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Evening | E 0 - 10 |
| Monday Night | ESE 5 - 15 |
| Tuesday Morning | ESE 20 - 30 |
| Tuesday Afternoon | ESE 20 - 30 |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Evening | SE 5 - 15 |
| Monday Night | ESE 10 - 20 |
| Tuesday Morning | ESE 20 - 30 |
| Tuesday Afternoon | ESE 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.
Free Winds at 9000' (mph)
| Mt. Baker | Washington Pass | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Evening | WNW 10 - 20 | WNW 10 - 20 | W 10 - 20 | WSW 15 - 25 | W 15 - 25 |
| Monday Night | S 5 - 15 | S 5 - 15 | SW 10 - 20 | SW 10 - 20 | SW 20 - 30 |
| Tuesday Morning | S 15 - 25 | S 15 - 25 | S 20 - 30 | S 35 - 45 | S 30 - 40 |
| Tuesday Afternoon | SSW 25 - 35 | SSW 20 - 30 | SSW 25 - 35 | S 35 - 45 | S 30 - 40 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Evening | WNW 10 - 20 |
| Monday Night | S 5 - 15 |
| Tuesday Morning | S 15 - 25 |
| Tuesday Afternoon | SSW 25 - 35 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Evening | WNW 10 - 20 |
| Monday Night | S 5 - 15 |
| Tuesday Morning | S 15 - 25 |
| Tuesday Afternoon | SSW 20 - 30 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Evening | W 10 - 20 |
| Monday Night | SW 10 - 20 |
| Tuesday Morning | S 20 - 30 |
| Tuesday Afternoon | SSW 25 - 35 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Evening | WSW 15 - 25 |
| Monday Night | SW 10 - 20 |
| Tuesday Morning | S 35 - 45 |
| Tuesday Afternoon | S 35 - 45 |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Evening | W 15 - 25 |
| Monday Night | SW 20 - 30 |
| Tuesday Morning | S 30 - 40 |
| Tuesday Afternoon | S 30 - 40 |
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: 5:09 PM PST Monday, January 7, 2019
Extended Weather Synopsis for Monday night through Monday
We should briefly be done with southerly flow after the trough's passage and a period of moderate precipitation Wednesday night. Light warm frontal moisture will quickly lift over Washington state during the day Thursday with snow levels creeping up once again. A high amplitude ridge will build over the inland Thursday night and Friday as freezing levels push even higher.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Wednesday Night | Snow Level | 3500' - 4500' | 4000' - 5000' | 5000' - 6000' | |
| Thursday | Snow Level | 4000' - 5000' | 4500' - 5500' | 5000' - 6000' | |
| Thursday Night | Freezing Level | 5500' - 6500' | 5500' - 6500' | 7000' - 8000' | * |
| Friday | Freezing Level | 6500' - 7500' | 7000' - 8000' | 7000' - 8000' | * |
| Mt. Baker | Elevation |
|---|---|
| Wednesday Night |
Snow Level 3500' - 4500' |
| Thursday |
Snow Level 4000' - 5000' |
| Thursday Night |
Freezing Level 5500' - 6500' (Easterly Flow *) |
| Friday |
Freezing Level 6500' - 7500' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday Night |
Snow Level 4000' - 5000' |
| Thursday |
Snow Level 4500' - 5500' |
| Thursday Night |
Freezing Level 5500' - 6500' (Easterly Flow *) |
| Friday |
Freezing Level 7000' - 8000' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Wednesday Night |
Snow Level 5000' - 6000' |
| Thursday |
Snow Level 5000' - 6000' |
| Thursday Night |
Freezing Level 7000' - 8000' (Easterly Flow *) |
| Friday |
Freezing Level 7000' - 8000' (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 Jan 7, 2019
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