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 Thursday
An atmospheric river continues to take aim at southern B.C., the Olympics and the northwest Cascades with heavy rainfall, mild temperatures and gusty winds. Less precipitation along with mild temperatures and wind can be found south along the west slopes of the Cascades through late Monday afternoon. Easterly flow through the Cascade Passes is causing multiple freezing levels and cold rain and/or freezing rain. Snowfall continues in the northeast Cascades, particularly Washington Pass where cold air remains entrenched.
The heaviest rain will continue for the same areas overnight. The moisture tap will begin to peter out as the frontal boundary associated with atmospheric river slides through the area Tuesday morning. The Hwy 2 corridor east of Stevens should slowly warm Monday night, but Washington Pass and the Methow Valley will likely not mix down warmer air until Tuesday afternoon. For everyone else, high snow levels will begin to slowly lower in the afternoon. Showers in SW post-frontal flow should decrease tomorrow, except in the Mt. Baker area where moderate precipitation is expected.
The decreasing shower trend will continue Tuesday night. A weak trough approaching the area on Wednesday should bring scattered showers to the region at relatively cooler snow levels.
Weather Forecast
Hurricane Ridge
| Monday Night | Moderate to heavy rain. Stormy. Mild. |
| Tuesday | Light rain and snow becoming scattered light rain and snow showers in the afternoon. Slow cooling trend. |
Mt. Baker
| Monday Night | Heavy rain and snow. Stormy. Mild. |
| Tuesday | Moderate rain and snow becoming light to moderate rain and snow showers in the afternoon. Slow cooling trend. |
Stevens and Snoqualmie Pass
| Monday Night | Light to occasionally moderate rain or freezing rain. Slow warming trend. |
| Tuesday | Light to moderate rain and snow becoming scattered light rain and snow showers in the afternoon. Slow cooling trend. |
Mt. Rainier and Crystal
| Monday Night | Moderate rain and snow. Stormy. Mild. |
| Tuesday | Moderate rain and snow becoming scattered light rain and snow showers in the afternoon. Slow cooling trend. |
Washington Pass and Leavenworth
| Monday Night | Light to occasionally moderate snow Washington Pass area. Light mixed precipitation Leavenworth area. Slow warming trend. |
| Tuesday | Light to moderate rain and snow becoming mostly cloudy with scattered light rain and snow showers in the afternoon. Warming trend peaking mid-day. |
Mt. Hood
| Monday Night | Periods of light rain and snow. Mild. |
| Tuesday | Light to moderate rain and snow becoming scattered light rain and snow showers in the afternoon. Slow cooling trend. |
Issued: 4:03 PM PST Monday, November 26, 2018
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Monday Evening | Snow Level * | 8500' | 7500' | 3000' | 4500' | 6000' | 7500' | 8000' | 8500' |
| Monday Night | Snow Level * | 7500' | 7000' | 4000' | 4500' | 6000' | 7500' | 7000' | 8000' |
| Tuesday Morning | Snow Level * | 6500' | 6500' | 4500' | 6000' | 7500' | 6500' | 7000' | 7500' |
| Tuesday Afternoon | Snow Level | 5500' | 5500' | 5500' | 5500' | 5500' | 5500' | 5500' | 6000' |
| Tuesday Evening | Snow Level | 5500' | 5000' | 5000' | 5500' | 5500' | 5000' | 5000' | 6000' |
| Tuesday Night | Snow Level | 5000' | 4500' | 4500' | 4500' | 4500' | 4500' | 4500' | 5000' |
| Wednesday Morning | Snow Level | 4000' | 4000' | 4000' | 4000' | 4000' | 4000' | 4000' | 5000' |
| Wednesday Afternoon | Snow Level | 4000' | 4000' | 4000' | 4000' | 4000' | 4500' | 4500' | 5500' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Evening |
Snow Level 8500' (Easterly Flow *) |
| Monday Night |
Snow Level 7500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 6500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 5500' |
| Tuesday Evening |
Snow Level 5500' |
| Tuesday Night |
Snow Level 5000' |
| Wednesday Morning |
Snow Level 4000' |
| Wednesday Afternoon |
Snow Level 4000' |
| Mt. Baker | Elevation |
|---|---|
| Monday Evening |
Snow Level 7500' (Easterly Flow *) |
| Monday Night |
Snow Level 7000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 6500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 5500' |
| Tuesday Evening |
Snow Level 5000' |
| Tuesday Night |
Snow Level 4500' |
| Wednesday Morning |
Snow Level 4000' |
| Wednesday Afternoon |
Snow Level 4000' |
| Washington Pass | Elevation |
|---|---|
| Monday Evening |
Snow Level 3000' (Easterly Flow *) |
| Monday Night |
Snow Level 4000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 4500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 5500' |
| Tuesday Evening |
Snow Level 5000' |
| Tuesday Night |
Snow Level 4500' |
| Wednesday Morning |
Snow Level 4000' |
| Wednesday Afternoon |
Snow Level 4000' |
| Leavenworth | Elevation |
|---|---|
| Monday Evening |
Snow Level 4500' (Easterly Flow *) |
| Monday Night |
Snow Level 4500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 6000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 5500' |
| Tuesday Evening |
Snow Level 5500' |
| Tuesday Night |
Snow Level 4500' |
| Wednesday Morning |
Snow Level 4000' |
| Wednesday Afternoon |
Snow Level 4000' |
| Stevens Pass | Elevation |
|---|---|
| Monday Evening |
Snow Level 6000' (Easterly Flow *) |
| Monday Night |
Snow Level 6000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 7500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 5500' |
| Tuesday Evening |
Snow Level 5500' |
| Tuesday Night |
Snow Level 4500' |
| Wednesday Morning |
Snow Level 4000' |
| Wednesday Afternoon |
Snow Level 4000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Evening |
Snow Level 7500' (Easterly Flow *) |
| Monday Night |
Snow Level 7500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 6500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 5500' |
| Tuesday Evening |
Snow Level 5000' |
| Tuesday Night |
Snow Level 4500' |
| Wednesday Morning |
Snow Level 4000' |
| Wednesday Afternoon |
Snow Level 4500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Evening |
Snow Level 8000' (Easterly Flow *) |
| Monday Night |
Snow Level 7000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 7000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 5500' |
| Tuesday Evening |
Snow Level 5000' |
| Tuesday Night |
Snow Level 4500' |
| Wednesday Morning |
Snow Level 4000' |
| Wednesday Afternoon |
Snow Level 4500' |
| Mt. Hood | Elevation |
|---|---|
| Monday Evening |
Snow Level 8500' (Easterly Flow *) |
| Monday Night |
Snow Level 8000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 7500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 6000' |
| Tuesday Evening |
Snow Level 6000' |
| Tuesday Night |
Snow Level 5000' |
| Wednesday Morning |
Snow Level 5000' |
| Wednesday Afternoon |
Snow 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
| Monday Night | Thursday | Thursday Night | Thursday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | 1.00 - 1.50 | 0.25 | LT 0.10 | LT 0.10 |
| Mt Baker Ski Area | 3.00 - 4.00 | 1.00 - 1.50 | 0.50 - 0.75 | LT 0.25 |
| Washington Pass | 0.75 | 0.50 - 0.75 | 0.25 | LT 0.10 |
| Stevens Pass | 0.50 | 0.50 | LT 0.25 | LT 0.10 |
| Snoqualmie Pass | 0.75 | 0.75 | 0.25 | LT 0.10 |
| Leavenworth | 0.25 | LT 0.25 | 0 | 0 |
| Mission Ridge | 0.25 | 0.25 | 0 | 0 |
| Crystal Mt | 1.00 - 1.50 | 0.25 - 0.50 | LT 0.10 | LT 0.10 |
| Paradise | 1.00 | 0.75 | 0.25 - 0.50 | LT 0.10 |
| White Pass | 0.25 | 0.25 - 0.50 | LT 0.10 | LT 0.10 |
| Mt Hood Meadows | LT 0.10 | 0.50 | LT 0.10 | LT 0.10 |
| Timberline | 0.25 | 0.50 - 0.75 | LT 0.10 | LT 0.25 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Monday Night | 1.00 - 1.50 |
| Thursday | 0.25 |
| Thursday Night | LT 0.10 |
| Thursday | LT 0.10 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Monday Night | 3.00 - 4.00 |
| Thursday | 1.00 - 1.50 |
| Thursday Night | 0.50 - 0.75 |
| Thursday | LT 0.25 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Monday Night | 0.75 |
| Thursday | 0.50 - 0.75 |
| Thursday Night | 0.25 |
| Thursday | LT 0.10 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Monday Night | 0.50 |
| Thursday | 0.50 |
| Thursday Night | LT 0.25 |
| Thursday | LT 0.10 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Monday Night | 0.75 |
| Thursday | 0.75 |
| Thursday Night | 0.25 |
| Thursday | LT 0.10 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Monday Night | 0.25 |
| Thursday | LT 0.25 |
| Thursday Night | 0 |
| Thursday | 0 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Monday Night | 0.25 |
| Thursday | 0.25 |
| Thursday Night | 0 |
| Thursday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Monday Night | 1.00 - 1.50 |
| Thursday | 0.25 - 0.50 |
| Thursday Night | LT 0.10 |
| Thursday | LT 0.10 |
| Paradise | Precipitation Forecast |
|---|---|
| Monday Night | 1.00 |
| Thursday | 0.75 |
| Thursday Night | 0.25 - 0.50 |
| Thursday | LT 0.10 |
| White Pass | Precipitation Forecast |
|---|---|
| Monday Night | 0.25 |
| Thursday | 0.25 - 0.50 |
| Thursday Night | LT 0.10 |
| Thursday | LT 0.10 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Monday Night | LT 0.10 |
| Thursday | 0.50 |
| Thursday Night | LT 0.10 |
| Thursday | LT 0.10 |
| Timberline | Precipitation Forecast |
|---|---|
| Monday Night | 0.25 |
| Thursday | 0.50 - 0.75 |
| Thursday Night | LT 0.10 |
| Thursday | LT 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: 4:03 PM PST Monday, November 26, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Evening | S 30 - 40 | S 25 - 40 | SE 15 - 30 | S 25 - 35 | S 15 - 35 |
| Monday Night | S 20 - 30 | SW 15 - 30 | SE 20 - 30 | SSW 20 - 30 | SW 15 - 25 |
| Tuesday Morning | SW 15 - 25 | SW 15 - 25 | SW 15 - 25 | SW 10 - 20 | SW 20 - 30 |
| Tuesday Afternoon | SW 10 - 20 | SW 10 - 20 | SW 10 - 20 | SW 10 - 20 | SW 15 - 25 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Evening | S 30 - 40 |
| Monday Night | S 20 - 30 |
| Tuesday Morning | SW 15 - 25 |
| Tuesday Afternoon | SW 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Monday Evening | S 25 - 40 |
| Monday Night | SW 15 - 30 |
| Tuesday Morning | SW 15 - 25 |
| Tuesday Afternoon | SW 10 - 20 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Evening | SE 15 - 30 |
| Monday Night | SE 20 - 30 |
| Tuesday Morning | SW 15 - 25 |
| Tuesday Afternoon | SW 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Evening | S 25 - 35 |
| Monday Night | SSW 20 - 30 |
| Tuesday Morning | SW 10 - 20 |
| Tuesday Afternoon | SW 10 - 20 |
| Mt. Hood | Elevation |
|---|---|
| Monday Evening | S 15 - 35 |
| Monday Night | SW 15 - 25 |
| Tuesday Morning | SW 20 - 30 |
| Tuesday Afternoon | SW 15 - 25 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Evening | S 30 - 40 |
| Monday Night | S 20 - 30 |
| Tuesday Morning | SW 15 - 25 |
| Tuesday Afternoon | SW 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Evening | S 25 - 40 |
| Monday Night | SW 15 - 30 |
| Tuesday Morning | SW 15 - 25 |
| Tuesday Afternoon | SW 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Evening | SE 15 - 30 |
| Monday Night | SE 20 - 30 |
| Tuesday Morning | SW 15 - 25 |
| Tuesday Afternoon | SW 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Evening | S 25 - 35 |
| Monday Night | SSW 20 - 30 |
| Tuesday Morning | SW 10 - 20 |
| Tuesday Afternoon | SW 10 - 20 |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Evening | S 15 - 35 |
| Monday Night | SW 15 - 25 |
| Tuesday Morning | SW 20 - 30 |
| Tuesday Afternoon | SW 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 | |
|---|---|---|---|---|---|
| Monday Evening | SW 40 - 50 | SW 40 - 50 | SW 50 - 60 | SW 40 - 50 | SW 55 - 65 |
| Monday Night | SW 40 - 50 | SW 30 - 40 | SW 55 - 65 | SW 55 - 65 | SW 55 - 65 |
| Tuesday Morning | SW 20 - 30 | SW 30 - 40 | SW 30 - 40 | SW 35 - 45 | SW 40 - 50 |
| Tuesday Afternoon | SW 20 - 30 | WSW 20 - 30 | WSW 30 - 40 | SW 30 - 40 | WSW 35 - 45 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Evening | SW 40 - 50 |
| Monday Night | SW 40 - 50 |
| Tuesday Morning | SW 20 - 30 |
| Tuesday Afternoon | SW 20 - 30 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Evening | SW 40 - 50 |
| Monday Night | SW 30 - 40 |
| Tuesday Morning | SW 30 - 40 |
| Tuesday Afternoon | WSW 20 - 30 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Evening | SW 50 - 60 |
| Monday Night | SW 55 - 65 |
| Tuesday Morning | SW 30 - 40 |
| Tuesday Afternoon | WSW 30 - 40 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Evening | SW 40 - 50 |
| Monday Night | SW 55 - 65 |
| Tuesday Morning | SW 35 - 45 |
| Tuesday Afternoon | SW 30 - 40 |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Evening | SW 55 - 65 |
| Monday Night | SW 55 - 65 |
| Tuesday Morning | SW 40 - 50 |
| Tuesday Afternoon | WSW 35 - 45 |
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: 4:03 PM PST Monday, November 26, 2018
Extended Weather Synopsis for Thursday night through Thursday
The jet stream will be aimed into Northern Califonia through the extended with a pair of developing low pressure systems diving south of the PNW on Thursday and again late Friday afternoon/night. Mt. Hood may be clipped by the northern edge of the precipitation shield as these systems pass inland. Weak shortwave troughs should cause scattered showers for the Washington Cascades during this stretch. Snow levels will slowly lower through the week.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Wednesday Night | Snow Level | 3000' - 4000' | 3500' - 4500' | 4000' - 5000' | |
| Thursday | Snow Level | 3000' - 4000' | 3500' - 4500' | 4000' - 5000' | |
| Thursday Night | Snow Level | 3000' - 4000' | 3000' - 4000' | 3000' - 4000' | |
| Friday | Snow Level | 2500' - 3500' | 3000' - 4000' | 3000' - 4000' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday Night |
Snow Level 3000' - 4000' |
| Thursday |
Snow Level 3000' - 4000' |
| Thursday Night |
Snow Level 3000' - 4000' |
| Friday |
Snow Level 2500' - 3500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday Night |
Snow Level 3500' - 4500' |
| Thursday |
Snow Level 3500' - 4500' |
| Thursday Night |
Snow Level 3000' - 4000' |
| Friday |
Snow Level 3000' - 4000' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday Night |
Snow Level 4000' - 5000' |
| Thursday |
Snow Level 4000' - 5000' |
| Thursday Night |
Snow Level 3000' - 4000' |
| Friday |
Snow 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 Nov 25, 2018
The NWAC program is administered by the USDA-Forest Service and operates from the National Weather Service Forecast Office in Seattle. NWAC services are made possible by important collaboration and support from a wide variety of federal, state and private cooperators.