Issued: 7:06 AM PST Monday, November 30, 2020
by Dennis D'Amico

Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k

Weather Synopsis for Monday & Sunday

A vigorous cold front passed through the Cascades around 6 am this morning.  Heavy post-frontal showers will continue to quickly pile up new snow above 3000' through at least late morning. 6-12" of snow is likely by the afternoon, with only slightly lower amounts along the east slopes of the Cascades. Beginning in the early afternoon, shower activity should begin to ease and become more scattered for most areas except where moderate showers are expected to continue for the West Hwy 2/Stevens Pass corridor and north to the Skagit/Whatcom line. This is the area most likely to see a convergence zone, but the westerly flow is strong enough that a defined PSCZ seems unlikely versus a more chaotic shower pattern. Post-frontal westerly winds will be strong and very gusty today for most areas as well, with the strong winds continuing through the afternoon and slowly pulling back overnight.  Expect snowfall and strong west winds to spill over to the east slopes of the Cascades today as well. 

Shower activity will wind down tonight as conditions dry out.  A clearing trend should take place quickly, erasing low level clouds trapped along the west slopes of the Cascades Tuesday morning as a strong upper level ridge amplifies offshore. Sunshine and slightly rising freezing levels will be the norm on Tuesday. A broad area of warm air associated with the ridge won't make much headway into our mountains on Tuesday except for perhaps the Mt Hood area where alpine temperatures should pop above freezing in the afternoon. A significant offshore flow event with easterly winds should begin to kick into gear sometime late Tuesday afternoon. 

Weather Forecast

Hurricane Ridge
Mt. Baker
Washington Pass and Leavenworth
Stevens and Snoqualmie Pass
Mt. Rainier, Crystal and White Pass
Mt. Hood

Snow/Freezing Level (ft)

Hurricane Ridge Mt. Baker Washington Pass Leavenworth Stevens Pass Snoqualmie Pass Mt. Rainier, Crystal & White Pass Mt. Hood
Monday Morning Snow Level 3000' 3000' 2000' 2500' 3000' 3000' 3500' 4000'
Monday Afternoon Snow Level 2000' 2500' 2000' 2500' 2500' 2500' 2500' 3000'
Monday Evening Snow Level 2000' 2000' 1500' 2000' 2000' 2000' 2000' 2500'
Monday Night Snow Level 1500' 1000' 0' 1000' 1000' 1500' 1500' 2000'
Tuesday Morning Freezing Level 3000' 1500' 1500' 2500' 2500' 2500' 3000' 3000'
Hurricane Ridge Elevation
Monday Morning Snow Level
3000'
Monday Afternoon Snow Level
2000'
Monday Evening Snow Level
2000'
Monday Night Snow Level
1500'
Tuesday Morning Freezing Level
3000'
Tuesday Afternoon Freezing Level
4500'
Mt. Baker Elevation
Monday Morning Snow Level
3000'
Monday Afternoon Snow Level
2500'
Monday Evening Snow Level
2000'
Monday Night Snow Level
1000'
Tuesday Morning Freezing Level
1500'
Tuesday Afternoon Freezing Level
4000'
Washington Pass Elevation
Monday Morning Snow Level
2000'
Monday Afternoon Snow Level
2000'
Monday Evening Snow Level
1500'
Monday Night Snow Level
0'
Tuesday Morning Freezing Level
1500'
Tuesday Afternoon Freezing Level
3500'
Leavenworth Elevation
Monday Morning Snow Level
2500'
Monday Afternoon Snow Level
2500'
Monday Evening Snow Level
2000'
Monday Night Snow Level
1000'
Tuesday Morning Freezing Level
2500'
Tuesday Afternoon Freezing Level
3500'
Stevens Pass Elevation
Monday Morning Snow Level
3000'
Monday Afternoon Snow Level
2500'
Monday Evening Snow Level
2000'
Monday Night Snow Level
1000'
Tuesday Morning Freezing Level
2500'
Tuesday Afternoon Freezing Level
3500'
Snoqualmie Pass Elevation
Monday Morning Snow Level
3000'
Monday Afternoon Snow Level
2500'
Monday Evening Snow Level
2000'
Monday Night Snow Level
1500'
Tuesday Morning Freezing Level
2500'
Tuesday Afternoon Freezing Level
3500'
Mt. Rainier & Crystal Elevation
Monday Morning Snow Level
3500'
Monday Afternoon Snow Level
2500'
Monday Evening Snow Level
2000'
Monday Night Snow Level
1500'
Tuesday Morning Freezing Level
3000'
Tuesday Afternoon Freezing Level
5000'
Mt. Hood Elevation
Monday Morning Snow Level
4000'
Monday Afternoon Snow Level
3000'
Monday Evening Snow Level
2500'
Monday Night Snow Level
2000'
Tuesday Morning Freezing Level
3000'
Tuesday Afternoon Freezing Level
7500'

* 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 Monday Night Sunday
4 am - 4 pm 4 pm - 4 am 4 am - 4 pm
Hurricane Ridge 0.25 - 0.50 0 0
Mt Baker Ski Area 1.00 0 0
Washington Pass 0.50 0 0
Leavenworth 0.25 0 0
Stevens Pass 0.75 LT 0.10 0
Snoqualmie Pass 0.50 - 0.75 LT 0.10 0
Mission Ridge LT 0.25 0 0
Crystal Mt 0.50 0 0
Paradise 0.75 -1.00 0 0
White Pass 0.50 - 0.75 0 0
Mt Hood Meadows 0.75 -1.00 0 0
0.75 -1.00 0 0
Hurricane Ridge Precipitation Forecast
Monday 0.25 - 0.50
Monday Night 0
Sunday 0
Mt Baker Ski Area Precipitation Forecast
Monday 1.00
Monday Night 0
Sunday 0
Washington Pass Precipitation Forecast
Monday 0.50
Monday Night 0
Sunday 0
Leavenworth Precipitation Forecast
Monday 0.25
Monday Night 0
Sunday 0
Stevens Pass Precipitation Forecast
Monday 0.75
Monday Night LT 0.10
Sunday 0
Snoqualmie Pass Precipitation Forecast
Monday 0.50 - 0.75
Monday Night LT 0.10
Sunday 0
Mission Ridge Precipitation Forecast
Monday LT 0.25
Monday Night 0
Sunday 0
Crystal Mt Precipitation Forecast
Monday 0.50
Monday Night 0
Sunday 0
Paradise Precipitation Forecast
Monday 0.75 -1.00
Monday Night 0
Sunday 0
White Pass Precipitation Forecast
Monday 0.50 - 0.75
Monday Night 0
Sunday 0
Mt Hood Meadows Precipitation Forecast
Monday 0.75 -1.00
Monday Night 0
Sunday 0
Timberline Precipitation Forecast
Monday 0.75 -1.00
Monday Night 0
Sunday 0

Free Winds at 5000' (mph)

Hurricane Ridge Mt. Baker Stevens to Snoqualmie Pass Mt. Rainier Mt. Hood
Monday Morning W 30 - 40 SSW 35 - 45 WSW 30 - 40 WSW 30 - 40 WSW 30 - 40
Monday Afternoon W 20 - 30 W 15 - 25 W 30 - 40 W 25 - 35 W 30 - 40
Monday Evening WNW 10 - 20 WNW 5 - 15 NW 15 - 25 NW 10 - 20 WNW 20 - 30
Monday Night W 5 - 15 W 0 - 10 NW 10 - 20 NW 5 - 15 NW 10 - 20
Tuesday Morning NW 0 - 10 VAR 0 - 10 WNW 5 - 15 VAR 0 - 10 VAR 0 - 10
Hurricane Ridge Elevation
Monday Morning W 30 - 40
Monday Afternoon W 20 - 30
Monday Evening WNW 10 - 20
Monday Night W 5 - 15
Tuesday Morning NW 0 - 10
Tuesday Afternoon NE 0 - 10
Mt. Baker Elevation
Monday Morning SSW 35 - 45
Monday Afternoon W 15 - 25
Monday Evening WNW 5 - 15
Monday Night W 0 - 10
Tuesday Morning VAR 0 - 10
Tuesday Afternoon E 0 - 10
Stevens and Snoqualmie Pass Elevation
Monday Morning WSW 30 - 40
Monday Afternoon W 30 - 40
Monday Evening NW 15 - 25
Monday Night NW 10 - 20
Tuesday Morning WNW 5 - 15
Tuesday Afternoon ESE 5 - 15
Mt. Rainier Elevation
Monday Morning WSW 30 - 40
Monday Afternoon W 25 - 35
Monday Evening NW 10 - 20
Monday Night NW 5 - 15
Tuesday Morning VAR 0 - 10
Tuesday Afternoon E 0 - 10
Mt. Hood Elevation
Monday Morning WSW 30 - 40
Monday Afternoon W 30 - 40
Monday Evening WNW 20 - 30
Monday Night NW 10 - 20
Tuesday Morning VAR 0 - 10
Tuesday Afternoon ESE 5 - 15
Hurricane Ridge Direction - Speed
Monday Morning W 30 - 40
Monday Afternoon W 20 - 30
Monday Evening WNW 10 - 20
Monday Night W 5 - 15
Tuesday Morning NW 0 - 10
Tuesday Afternoon NE 0 - 10
Mt. Baker Direction - Speed
Monday Morning SSW 35 - 45
Monday Afternoon W 15 - 25
Monday Evening WNW 5 - 15
Monday Night W 0 - 10
Tuesday Morning VAR 0 - 10
Tuesday Afternoon E 0 - 10
Stevens and Snoqualmie Pass Direction - Speed
Monday Morning WSW 30 - 40
Monday Afternoon W 30 - 40
Monday Evening NW 15 - 25
Monday Night NW 10 - 20
Tuesday Morning WNW 5 - 15
Tuesday Afternoon ESE 5 - 15
Mt. Rainier Direction - Speed
Monday Morning WSW 30 - 40
Monday Afternoon W 25 - 35
Monday Evening NW 10 - 20
Monday Night NW 5 - 15
Tuesday Morning VAR 0 - 10
Tuesday Afternoon E 0 - 10
Mt. Hood Direction - Speed
Monday Morning WSW 30 - 40
Monday Afternoon W 30 - 40
Monday Evening WNW 20 - 30
Monday Night NW 10 - 20
Tuesday Morning VAR 0 - 10
Tuesday Afternoon ESE 5 - 15

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 Morning SW 35 - 45 SW 40 - 50 WSW 45 - 60 WSW 45 - 60 W 45 - 60
Monday Afternoon W 30 - 40 W 45 - 60 W 45 - 60 W 45 - 60 W 45 - 60
Monday Evening NW 20 - 30 NW 30 - 40 NW 40 - 50 NW 40 - 50 NW 40 - 50
Monday Night NW 15 - 25 NW 10 - 20 NW 20 - 30 NW 15 - 25 NW 20 - 30
Tuesday Morning NW 10 - 20 NW 5 - 15 NW 15 - 25 NW 10 - 20 NW 10 - 20
Mt. Baker Direction - Speed
Monday Morning SW 35 - 45
Monday Afternoon W 30 - 40
Monday Evening NW 20 - 30
Monday Night NW 15 - 25
Tuesday Morning NW 10 - 20
Tuesday Afternoon NE 5 - 15
Washington Pass Direction - Speed
Monday Morning SW 40 - 50
Monday Afternoon W 45 - 60
Monday Evening NW 30 - 40
Monday Night NW 10 - 20
Tuesday Morning NW 5 - 15
Tuesday Afternoon NE 10 - 20
Stevens and Snoqualmie Pass Direction - Speed
Monday Morning WSW 45 - 60
Monday Afternoon W 45 - 60
Monday Evening NW 40 - 50
Monday Night NW 20 - 30
Tuesday Morning NW 15 - 25
Tuesday Afternoon ENE 5 - 15
Mt. Rainier Direction - Speed
Monday Morning WSW 45 - 60
Monday Afternoon W 45 - 60
Monday Evening NW 40 - 50
Monday Night NW 15 - 25
Tuesday Morning NW 10 - 20
Tuesday Afternoon ENE 5 - 15
Mt. Hood Direction - Speed
Monday Morning W 45 - 60
Monday Afternoon W 45 - 60
Monday Evening NW 40 - 50
Monday Night NW 20 - 30
Tuesday Morning NW 10 - 20
Tuesday 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.

Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k

Previous forecast from Nov 29, 2020

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