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 Sunday
A disturbance moving over the Cascades on Sunday afternoon moves in on a cool, post-frontal, westerly flow, returning snow region after a partial break in the action Sunday morning. Moderate snowfall has been focused on the mountain loop region, with more convective snow continuing to arrive on the coast. Behind the disturbance, atmospheric stability and wind speed conditions are ripe for convergence. Convergence bands are expected to form Sunday evening slightly north of Stevens and perhaps near Snoqualmie before the northern band gradually shifts southward overnight. Forecast models generally between 0.5-1.0" of water (6-15" of snowfall) to the central Cascades during this event with reasonable amounts of snowfall spilling over east of the crest. Paradise and Mt. Hood should also see moderate to heavy snow overnight. The snowfall and convergence activity winds down Monday during the day as drier NW flow and high-pressure work into the region, bringing increasing sunshine to many parts of the Cascades by the afternoon.
Most of the precipitation should be done by Monday night, but some up-sloping with the northerly flow may bring light snow showers to the Hurricane Ridge area. Clearing skies in other areas should bring cold temperatures to many areas Monday night as the ridge amplifies offshore and edges further into the region. The ridge moves eastward on Tuesday and the westerly flow flips easterly as the atmosphere to the west of the Cascade Crest beginning to warm with descending air beneath the high pressure.
Weather Forecast
Hurricane Ridge
| Sunday Night | Light showers tapering off after midnight with partial clearing. |
| Monday | Partly cloudy with a chance of snow flurries. |
Mt. Baker
| Sunday Night | Light snow in the evening tapering to snow flurries. |
| Monday | Mostly cloudy with snow flurries at times. |
Washington Pass and Leavenworth
| Sunday Night | Light snow in the evening with light to moderate snow in the east-central region where convergence spills over the crest. Moderate to strong winds in the alpine south of Washington Pass, gradually decreasing. |
| Monday | Snow flurries lingering near the Cascade Crest with mostly sunny skies a few miles east. |
Stevens and Snoqualmie Pass
| Sunday Night | Bands of moderate to heavy snow in well-defined convergence. Convergence heaviest in the evening for Stevens and possibly in the evening or overnight for Snoqualmie. Gradually decreasing W wind 10-20 mph through the mountain gaps. Moderate to strong winds in the alpine gradually decreasing. |
| Monday | Moderate convergence winding down in the early morning hours near Snoqualmie with light snow shower activity continuing and gradually winding down for Snoqualmie and Stevens in the afternoon. W wind 5-15 mph through the Passes. |
Mt. Rainier, Crystal and White Pass
| Sunday Night | Moderate to heavy snow at Paradise with light to moderate snow at Crystal and White Pass. Snowfall heaviest in the evening. Moderate to strong winds in the alpine gradually decreasing. |
| Monday | Mostly clearing skies. |
Mt. Hood
| Sunday Night | Heavy snow. Moderate to strong winds in the alpine gradually decreasing. |
| Monday | Light to moderate snow winding down in the morning. Becoming mostly cloudy in the afternoon. |
Issued: 2:46 PM PST Sunday, February 16, 2020
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' | 1500' | 1500' | 2000' | 1500' | 2000' | 2000' | 2500' |
| Sunday Night | Snow Level | 1000' | 500' | 500' | 500' | 500' | 500' | 500' | 1500' |
| Monday Morning | Snow Level | 1000' | 500' | 5000' | 1000' | 1000' | 1000' | 1000' | 1500' |
| Monday Afternoon | Snow Level | 2000' | 1500' | 2000' | 2000' | 1500' | 1500' | 2000' | 2000' |
| Monday Evening | Snow Level | 1500' | 1000' | 1000' | 1500' | 1000' | 1000' | 1500' | 2000' |
| Monday Night | Snow Level | 500' | 0' | 0' | 0' | 0' | 0' | 0' | 1000' |
| Tuesday Morning | Freezing Level * | 1500' | 1500' | 1500' | 1500' | 1500' | 1500' | 2000' | 2000' |
| Tuesday Afternoon | Freezing Level * | 2500' | 2500' | 3500' | 3000' | 2500' | 2500' | 3000' | 3500' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Evening |
Snow Level 1500' |
| Sunday Night |
Snow Level 1000' |
| Monday Morning |
Snow Level 1000' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Snow Level 1500' |
| Monday Night |
Snow Level 500' |
| Tuesday Morning |
Freezing Level 1500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 2500' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Sunday Evening |
Snow Level 1500' |
| Sunday Night |
Snow Level 500' |
| Monday Morning |
Snow Level 500' |
| Monday Afternoon |
Snow Level 1500' |
| Monday Evening |
Snow Level 1000' |
| Monday Night |
Snow Level 0' |
| Tuesday Morning |
Freezing Level 1500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 2500' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Sunday Evening |
Snow Level 1500' |
| Sunday Night |
Snow Level 500' |
| Monday Morning |
Snow Level 5000' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Snow Level 1000' |
| Monday Night |
Snow Level 0' |
| Tuesday Morning |
Freezing Level 1500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 3500' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Sunday Evening |
Snow Level 2000' |
| Sunday Night |
Snow Level 500' |
| Monday Morning |
Snow Level 1000' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Snow Level 1500' |
| Monday Night |
Snow Level 0' |
| Tuesday Morning |
Freezing Level 1500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 3000' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Sunday Evening |
Snow Level 1500' |
| Sunday Night |
Snow Level 500' |
| Monday Morning |
Snow Level 1000' |
| Monday Afternoon |
Snow Level 1500' |
| Monday Evening |
Snow Level 1000' |
| Monday Night |
Snow Level 0' |
| Tuesday Morning |
Freezing Level 1500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 2500' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Evening |
Snow Level 2000' |
| Sunday Night |
Snow Level 500' |
| Monday Morning |
Snow Level 1000' |
| Monday Afternoon |
Snow Level 1500' |
| Monday Evening |
Snow Level 1000' |
| Monday Night |
Snow Level 0' |
| Tuesday Morning |
Freezing Level 1500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 2500' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Evening |
Snow Level 2000' |
| Sunday Night |
Snow Level 500' |
| Monday Morning |
Snow Level 1000' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Snow Level 1500' |
| Monday Night |
Snow Level 0' |
| Tuesday Morning |
Freezing Level 2000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 3000' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Sunday Evening |
Snow Level 2500' |
| Sunday Night |
Snow Level 1500' |
| Monday Morning |
Snow Level 1500' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Snow Level 2000' |
| Monday Night |
Snow Level 1000' |
| Tuesday Morning |
Freezing Level 2000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 3500' (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
| Sunday Night | Sunday | Sunday Night | Sunday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | LT 0.25 | 0 | LT 0.10 | 0 |
| Mt Baker Ski Area | 0.25 | LT 0.10 | 0 | 0 |
| Washington Pass | LT 0.25 | 0 | 0 | 0 |
| Leavenworth | LT 0.25 | 0 | 0 | 0 |
| Stevens Pass | 0.50 - 0.75 | LT 0.10 | 0 | 0 |
| Snoqualmie Pass | 0.50 - 0.75 | LT 0.10 | 0 | 0 |
| Mission Ridge | LT 0.10 | 0 | 0 | 0 |
| Crystal Mt | 0.25 | 0 | 0 | 0 |
| Paradise | 0.50 - 0.75 | LT 0.10 | 0 | 0 |
| White Pass | 0.25 | 0 | 0 | 0 |
| Mt Hood Meadows | 0.50 - 0.75 | LT 0.25 | 0 | 0 |
| Timberline | 0.75 | LT 0.25 | 0 | 0 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Sunday | 0 |
| Sunday Night | LT 0.10 |
| Sunday | 0 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Sunday Night | 0.25 |
| Sunday | LT 0.10 |
| Sunday Night | 0 |
| Sunday | 0 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | 0 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0.50 - 0.75 |
| Sunday | LT 0.10 |
| Sunday Night | 0 |
| Sunday | 0 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0.50 - 0.75 |
| Sunday | LT 0.10 |
| Sunday Night | 0 |
| Sunday | 0 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Sunday Night | 0.25 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | 0 |
| Paradise | Precipitation Forecast |
|---|---|
| Sunday Night | 0.50 - 0.75 |
| Sunday | LT 0.10 |
| Sunday Night | 0 |
| Sunday | 0 |
| White Pass | Precipitation Forecast |
|---|---|
| Sunday Night | 0.25 |
| Sunday | 0 |
| Sunday Night | 0 |
| Sunday | 0 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Sunday Night | 0.50 - 0.75 |
| Sunday | LT 0.25 |
| Sunday Night | 0 |
| Sunday | 0 |
| Timberline | Precipitation Forecast |
|---|---|
| Sunday Night | 0.75 |
| Sunday | LT 0.25 |
| Sunday Night | 0 |
| Sunday | 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: 2:46 PM PST Sunday, February 16, 2020
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Evening | W 15 - 25 | W 5 - 15 | W 20 - 30 | W 15 - 25 | W 25 - 35 |
| Sunday Night | W 10 - 20 | WSW 5 - 15 | W 10 - 20 | W 10 - 20 | W 20 - 30 |
| Monday Morning | W 5 - 15 | WSW 5 - 15 | WNW 5 - 15 | W 0 - 10 | WNW 10 - 20 |
| Monday Afternoon | W 0 - 10 | WSW 0 - 10 | W 0 - 10 | W 0 - 10 | WNW 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Evening | W 15 - 25 |
| Sunday Night | W 10 - 20 |
| Monday Morning | W 5 - 15 |
| Monday Afternoon | W 0 - 10 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Evening | W 5 - 15 |
| Sunday Night | WSW 5 - 15 |
| Monday Morning | WSW 5 - 15 |
| Monday Afternoon | WSW 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Evening | W 20 - 30 |
| Sunday Night | W 10 - 20 |
| Monday Morning | WNW 5 - 15 |
| Monday Afternoon | W 0 - 10 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Evening | W 15 - 25 |
| Sunday Night | W 10 - 20 |
| Monday Morning | W 0 - 10 |
| Monday Afternoon | W 0 - 10 |
| Mt. Hood | Elevation |
|---|---|
| Sunday Evening | W 25 - 35 |
| Sunday Night | W 20 - 30 |
| Monday Morning | WNW 10 - 20 |
| Monday Afternoon | WNW 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Evening | W 15 - 25 |
| Sunday Night | W 10 - 20 |
| Monday Morning | W 5 - 15 |
| Monday Afternoon | W 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Evening | W 5 - 15 |
| Sunday Night | WSW 5 - 15 |
| Monday Morning | WSW 5 - 15 |
| Monday Afternoon | WSW 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Evening | W 20 - 30 |
| Sunday Night | W 10 - 20 |
| Monday Morning | WNW 5 - 15 |
| Monday Afternoon | W 0 - 10 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Evening | W 15 - 25 |
| Sunday Night | W 10 - 20 |
| Monday Morning | W 0 - 10 |
| Monday Afternoon | W 0 - 10 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Evening | W 25 - 35 |
| Sunday Night | W 20 - 30 |
| Monday Morning | WNW 10 - 20 |
| Monday Afternoon | WNW 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 | |
|---|---|---|---|---|---|
| Sunday Evening | W 15 - 25 | W 15 - 25 | W 30 - 40 | W 30 - 40 | W 35 - 45 |
| Sunday Night | WNW 10 - 20 | WNW 15 - 25 | WNW 25 - 35 | WNW 20 - 30 | W 35 - 45 |
| Monday Morning | W 5 - 15 | NW 5 - 15 | NW 25 - 35 | NW 20 - 30 | N 15 - 25 |
| Monday Afternoon | W 5 - 15 | W 5 - 15 | NW 15 - 25 | NW 10 - 20 | NNW 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Evening | W 15 - 25 |
| Sunday Night | WNW 10 - 20 |
| Monday Morning | W 5 - 15 |
| Monday Afternoon | W 5 - 15 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Evening | W 15 - 25 |
| Sunday Night | WNW 15 - 25 |
| Monday Morning | NW 5 - 15 |
| Monday Afternoon | W 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Evening | W 30 - 40 |
| Sunday Night | WNW 25 - 35 |
| Monday Morning | NW 25 - 35 |
| Monday Afternoon | NW 15 - 25 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Evening | W 30 - 40 |
| Sunday Night | WNW 20 - 30 |
| Monday Morning | NW 20 - 30 |
| Monday Afternoon | NW 10 - 20 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Evening | W 35 - 45 |
| Sunday Night | W 35 - 45 |
| Monday Morning | N 15 - 25 |
| Monday Afternoon | NNW 10 - 20 |
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: 2:46 PM PST Sunday, February 16, 2020
Extended Weather Synopsis for Sunday night through Sunday
Expect high pressure to predominate Tuesday night through Wednesday night as it gradually slides across the region. Easterly flow should be in the moderate range with a strong (15-20F) temperature difference with the cold pool holding strong east of the Cascade Crest and warm days and milder nights west of the Crest. The ridge breaks down Thursday as a weakening front fizzles in the near-shore waters.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Tuesday Night | Freezing Level | 1500' - 3000' | 1000' - 2500' | 1500' - 3500' | * |
| Wednesday | Freezing Level | 5000' - 6000' | 1000' - 3000' | 1500' - 3500' | * |
| Wednesday Night | Freezing Level | 3500' - 5500' | 2000' - 3000' | 3000' - 5000' | * |
| Thursday | Freezing Level | 2000' - 4000' | 1500' - 3500' | 2500' - 4500' | * |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Night |
Freezing Level 1500' - 3000' (Easterly Flow *) |
| Wednesday |
Freezing Level 5000' - 6000' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 3500' - 5500' (Easterly Flow *) |
| Thursday |
Freezing Level 2000' - 4000' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Night |
Freezing Level 1000' - 2500' (Easterly Flow *) |
| Wednesday |
Freezing Level 1000' - 3000' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 2000' - 3000' (Easterly Flow *) |
| Thursday |
Freezing Level 1500' - 3500' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Night |
Freezing Level 1500' - 3500' (Easterly Flow *) |
| Wednesday |
Freezing Level 1500' - 3500' (Easterly Flow *) |
| Wednesday Night |
Freezing Level 3000' - 5000' (Easterly Flow *) |
| Thursday |
Freezing Level 2500' - 4500' (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 Feb 16, 2020
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