Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Thursday night through Saturday
A low pressure embedded in NW flow near the Alaska Panhandle will drop SSE, forcing Thursday's high-pressure ridge southeastward as it moves. Increasing cloud cover will replace the clear skies in advance of the system with very light snow developing in the Olympics and North Cascades by Friday morning. Snow will increase until a front passes from Friday around mid-day in the Olympics until the early evening hours near Mt. Hood. Expect a period of moderate snow as the front passes. The winds appear to be the more significant event than the snowfall with moderate to strong winds associated with the frontal passage.
Convergence zones will likely form during the late afternoon and evening hours. Bands of heavier convergence (possibly near Snoqualmie) are likely to produce greater amounts of snowfall than with the original frontal passage. A cold upper trough will spin off the coast Friday night and Saturday and will continue instability snow showers under modest westerly flow aloft as it approaches Washington State. Temperatures will cool behind the front and snow levels will be only 500-1000 ft above sea level once the upper trough settles into place. Snowfall during this period will generally be light.
Weather Forecast
Hurricane Ridge
| Thursday Night | Increasing high clouds, lowering and thickening by morning. Cool. Light winds gusting moderate by morning. |
| Friday | Increasing light to moderate snow, heaviest in the early afternoon, then becoming showery late in the day. Moderate winds gusting strong. |
Mt. Baker
| Thursday Night | Increasing high clouds, lowering and thickening by morning. Cool. Light winds gusting moderate by morning. |
| Friday | Light snow developing in the morning and becoming light to moderate in the afternoon. Moderate to strong winds. |
Washington Pass and Leavenworth
| Thursday Night | Increasing high clouds, lowering by morning. Cool. Light winds gusting moderate by morning. |
| Friday | Light snow developing in the morning and becoming light to moderate in the afternoon. Moderate winds peaking in the early afternoon and possibly gusting strong. |
Stevens and Snoqualmie Pass
| Thursday Night | Increasing high clouds, lowering and thickening by morning. Cool. Light east winds at the pass, light west wind at 5000 ft. |
| Friday | Light snow developing in the morning and becoming light to moderate in the afternoon. Moderate to strong winds, with moderate west winds through the passes. |
Mt. Rainier, Crystal and White Pass
| Thursday Night | Increasing high clouds, lowering and thickening by morning. Cool. Light winds gusting moderate by morning. |
| Friday | Light snow developing in the late morning and becoming light to moderate in the afternoon. Heaviest at Paradise. Moderate to strong winds peaking in the late afternoon. |
Mt. Hood
| Thursday Night | Increasing high clouds, lowering by morning. Cool. Light winds gusting moderate by morning. |
| Friday | Light snow developing in the early afternoon and becoming light to moderate by evening. Moderate winds becoming strong by the afternoon. |
Issued: 2:44 PM PST Thursday, February 21, 2019
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Thursday Evening | Freezing Level * | 2500' | 2000' | 2000' | 1500' | 2000' | 2000' | 2000' | 2000' |
| Thursday Night | Freezing Level * | 2000' | 500' | 0' | 0' | 500' | 500' | 500' | 500' |
| Friday Morning | Snow Level | 1500' | 0' | 0' | 0' | 0' | 0' | 500' | 0' |
| Friday Afternoon | Snow Level | 2000' | 500' | 500' | 1500' | 1500' | 1500' | 1500' | 2500' |
| Friday Evening | Snow Level | 1500' | 1000' | 1000' | 500' | 1000' | 1000' | 1000' | 2500' |
| Friday Night | Snow Level | 1000' | 1000' | 500' | 1000' | 1000' | 1000' | 1000' | 1500' |
| Saturday Morning | Snow Level | 1000' | 500' | 0' | 0' | 500' | 500' | 500' | 1000' |
| Saturday Afternoon | Snow Level | 2000' | 1000' | 500' | 500' | 1500' | 1500' | 1500' | 1500' |
| Hurricane Ridge | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 2500' (Easterly Flow *) |
| Thursday Night |
Freezing Level 2000' (Easterly Flow *) |
| Friday Morning |
Snow Level 1500' |
| Friday Afternoon |
Snow Level 2000' |
| Friday Evening |
Snow Level 1500' |
| Friday Night |
Snow Level 1000' |
| Saturday Morning |
Snow Level 1000' |
| Saturday Afternoon |
Snow Level 2000' |
| Mt. Baker | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 2000' (Easterly Flow *) |
| Thursday Night |
Freezing Level 500' (Easterly Flow *) |
| Friday Morning |
Snow Level 0' |
| Friday Afternoon |
Snow Level 500' |
| Friday Evening |
Snow Level 1000' |
| Friday Night |
Snow Level 1000' |
| Saturday Morning |
Snow Level 500' |
| Saturday Afternoon |
Snow Level 1000' |
| Washington Pass | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 2000' (Easterly Flow *) |
| Thursday Night |
Freezing Level 0' (Easterly Flow *) |
| Friday Morning |
Snow Level 0' |
| Friday Afternoon |
Snow Level 500' |
| Friday Evening |
Snow Level 1000' |
| Friday Night |
Snow Level 500' |
| Saturday Morning |
Snow Level 0' |
| Saturday Afternoon |
Snow Level 500' |
| Leavenworth | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 1500' (Easterly Flow *) |
| Thursday Night |
Freezing Level 0' (Easterly Flow *) |
| Friday Morning |
Snow Level 0' |
| Friday Afternoon |
Snow Level 1500' |
| Friday Evening |
Snow Level 500' |
| Friday Night |
Snow Level 1000' |
| Saturday Morning |
Snow Level 0' |
| Saturday Afternoon |
Snow Level 500' |
| Stevens Pass | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 2000' (Easterly Flow *) |
| Thursday Night |
Freezing Level 500' (Easterly Flow *) |
| Friday Morning |
Snow Level 0' |
| Friday Afternoon |
Snow Level 1500' |
| Friday Evening |
Snow Level 1000' |
| Friday Night |
Snow Level 1000' |
| Saturday Morning |
Snow Level 500' |
| Saturday Afternoon |
Snow Level 1500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 2000' (Easterly Flow *) |
| Thursday Night |
Freezing Level 500' (Easterly Flow *) |
| Friday Morning |
Snow Level 0' |
| Friday Afternoon |
Snow Level 1500' |
| Friday Evening |
Snow Level 1000' |
| Friday Night |
Snow Level 1000' |
| Saturday Morning |
Snow Level 500' |
| Saturday Afternoon |
Snow Level 1500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 2000' (Easterly Flow *) |
| Thursday Night |
Freezing Level 500' (Easterly Flow *) |
| Friday Morning |
Snow Level 500' |
| Friday Afternoon |
Snow Level 1500' |
| Friday Evening |
Snow Level 1000' |
| Friday Night |
Snow Level 1000' |
| Saturday Morning |
Snow Level 500' |
| Saturday Afternoon |
Snow Level 1500' |
| Mt. Hood | Elevation |
|---|---|
| Thursday Evening |
Freezing Level 2000' (Easterly Flow *) |
| Thursday Night |
Freezing Level 500' (Easterly Flow *) |
| Friday Morning |
Snow Level 0' |
| Friday Afternoon |
Snow Level 2500' |
| Friday Evening |
Snow Level 2500' |
| Friday Night |
Snow Level 1500' |
| Saturday Morning |
Snow Level 1000' |
| Saturday Afternoon |
Snow Level 1500' |
* 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
| Thursday Night | Saturday | Saturday Night | Saturday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | 0 | 0.25 | LT 0.10 | LT 0.25 |
| Mt Baker Ski Area | 0 | 0.50 | LT 0.10 | LT 0.10 |
| Washington Pass | 0 | 0.25 | LT 0.10 | LT 0.10 |
| Leavenworth | 0 | LT 0.25 | LT 0.10 | LT 0.10 |
| Stevens Pass | 0 | 0.25 - 0.50 | LT 0.25 | LT 0.25 |
| Snoqualmie Pass | 0 | 0.25 - 0.50 | 0.25 - 0.50 | 0.25 |
| Mission Ridge | 0 | LT 0.25 | 0 | LT 0.10 |
| Crystal Mt | 0 | 0.25 | LT 0.10 | LT 0.25 |
| Paradise | 0 | 0.50 - 0.75 | LT 0.25 | 0.50 |
| White Pass | 0 | 0.25 | LT 0.25 | LT 0.25 |
| Mt Hood Meadows | 0 | 0.25 | 0.75 | 0.25 - 0.50 |
| Timberline | 0 | 0.25 | 0.75 | 0.25 - 0.50 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Saturday | 0.25 |
| Saturday Night | LT 0.10 |
| Saturday | LT 0.25 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Saturday | 0.50 |
| Saturday Night | LT 0.10 |
| Saturday | LT 0.10 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Saturday | 0.25 |
| Saturday Night | LT 0.10 |
| Saturday | LT 0.10 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Saturday | LT 0.25 |
| Saturday Night | LT 0.10 |
| Saturday | LT 0.10 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Saturday | 0.25 - 0.50 |
| Saturday Night | LT 0.25 |
| Saturday | LT 0.25 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Saturday | 0.25 - 0.50 |
| Saturday Night | 0.25 - 0.50 |
| Saturday | 0.25 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Saturday | LT 0.25 |
| Saturday Night | 0 |
| Saturday | LT 0.10 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Saturday | 0.25 |
| Saturday Night | LT 0.10 |
| Saturday | LT 0.25 |
| Paradise | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Saturday | 0.50 - 0.75 |
| Saturday Night | LT 0.25 |
| Saturday | 0.50 |
| White Pass | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Saturday | 0.25 |
| Saturday Night | LT 0.25 |
| Saturday | LT 0.25 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Saturday | 0.25 |
| Saturday Night | 0.75 |
| Saturday | 0.25 - 0.50 |
| Timberline | Precipitation Forecast |
|---|---|
| Thursday Night | 0 |
| Saturday | 0.25 |
| Saturday Night | 0.75 |
| Saturday | 0.25 - 0.50 |
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: 2:44 PM PST Thursday, February 21, 2019
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Thursday Evening | WSW 5 - 15 | SSW 5 - 15 | WSW 5 - 15 | SW 5 - 15 | SW 0 - 10 |
| Thursday Night | SW 10 - 20 | S 10 - 20 | W 10 - 20 | WSW 10 - 20 | W 10 - 20 |
| Friday Morning | SW 25 - 35 | SSE 25 - 35 | SSW 15 - 25 | SSW 15 - 25 | WSW 15 - 25 |
| Friday Afternoon | W 20 - 30 | SW 15 - 25 | WSW 25 - 35 | WSW 25 - 35 | WSW 30 - 45 |
| Hurricane Ridge | Elevation |
|---|---|
| Thursday Evening | WSW 5 - 15 |
| Thursday Night | SW 10 - 20 |
| Friday Morning | SW 25 - 35 |
| Friday Afternoon | W 20 - 30 |
| Mt. Baker | Elevation |
|---|---|
| Thursday Evening | SSW 5 - 15 |
| Thursday Night | S 10 - 20 |
| Friday Morning | SSE 25 - 35 |
| Friday Afternoon | SW 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Thursday Evening | WSW 5 - 15 |
| Thursday Night | W 10 - 20 |
| Friday Morning | SSW 15 - 25 |
| Friday Afternoon | WSW 25 - 35 |
| Mt. Rainier | Elevation |
|---|---|
| Thursday Evening | SW 5 - 15 |
| Thursday Night | WSW 10 - 20 |
| Friday Morning | SSW 15 - 25 |
| Friday Afternoon | WSW 25 - 35 |
| Mt. Hood | Elevation |
|---|---|
| Thursday Evening | SW 0 - 10 |
| Thursday Night | W 10 - 20 |
| Friday Morning | WSW 15 - 25 |
| Friday Afternoon | WSW 30 - 45 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Thursday Evening | WSW 5 - 15 |
| Thursday Night | SW 10 - 20 |
| Friday Morning | SW 25 - 35 |
| Friday Afternoon | W 20 - 30 |
| Mt. Baker | Direction - Speed |
|---|---|
| Thursday Evening | SSW 5 - 15 |
| Thursday Night | S 10 - 20 |
| Friday Morning | SSE 25 - 35 |
| Friday Afternoon | SW 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Thursday Evening | WSW 5 - 15 |
| Thursday Night | W 10 - 20 |
| Friday Morning | SSW 15 - 25 |
| Friday Afternoon | WSW 25 - 35 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Thursday Evening | SW 5 - 15 |
| Thursday Night | WSW 10 - 20 |
| Friday Morning | SSW 15 - 25 |
| Friday Afternoon | WSW 25 - 35 |
| Mt. Hood | Direction - Speed |
|---|---|
| Thursday Evening | SW 0 - 10 |
| Thursday Night | W 10 - 20 |
| Friday Morning | WSW 15 - 25 |
| Friday Afternoon | WSW 30 - 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.
Free Winds at 9000' (mph)
| Mt. Baker | Washington Pass | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Thursday Evening | W 15 - 25 | W 10 - 20 | NW 15 - 25 | NW 15 - 25 | N 10 - 20 |
| Thursday Night | WSW 20 - 30 | WSW 15 - 25 | W 20 - 30 | W 20 - 30 | WNW 15 - 25 |
| Friday Morning | WSW 20 - 30 | WSW 20 - 30 | W 30 - 45 | W 30 - 45 | W 25 - 35 |
| Friday Afternoon | SW 35 - 50 | SW 40 - 60 | WSW 50 - 70 | WSW 50 - 70 | W 50 - 70 |
| Mt. Baker | Direction - Speed |
|---|---|
| Thursday Evening | W 15 - 25 |
| Thursday Night | WSW 20 - 30 |
| Friday Morning | WSW 20 - 30 |
| Friday Afternoon | SW 35 - 50 |
| Washington Pass | Direction - Speed |
|---|---|
| Thursday Evening | W 10 - 20 |
| Thursday Night | WSW 15 - 25 |
| Friday Morning | WSW 20 - 30 |
| Friday Afternoon | SW 40 - 60 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Thursday Evening | NW 15 - 25 |
| Thursday Night | W 20 - 30 |
| Friday Morning | W 30 - 45 |
| Friday Afternoon | WSW 50 - 70 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Thursday Evening | NW 15 - 25 |
| Thursday Night | W 20 - 30 |
| Friday Morning | W 30 - 45 |
| Friday Afternoon | WSW 50 - 70 |
| Mt. Hood | Direction - Speed |
|---|---|
| Thursday Evening | N 10 - 20 |
| Thursday Night | WNW 15 - 25 |
| Friday Morning | W 25 - 35 |
| Friday Afternoon | W 50 - 70 |
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: 2:44 PM PST Thursday, February 21, 2019
Extended Weather Synopsis for Saturday night through Saturday
On Saturday night the snow shower activity will continue with the upper trough moving over Washington State on Sunday, decreasing westerly flow over Washington State and also associated snow shower activity. Slightly heavier snowfall totals can be expected in the south than the north under stronger westerly flow.
A north-south temperature gradient and an associated warm front will form over Oregon Sunday night and Monday with a system forming along this frontal boundary likely to impact the southern parts (or potentially all) of the forecast region on Monday as it moves ENE. This system may bring heavier snow and wind. This system may bring some slight warming to the Mt. Hood area, but snowfall is still expected at this time.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Saturday Night | Snow Level | 0' - 1000' | 0' - 1000' | 1000' - 2000' | * |
| Sunday | Snow Level | 0' - 1000' | 0' - 1000' | 1000' - 2000' | * |
| Sunday Night | Snow Level | 0' - 1000' | 0' - 1000' | 1000' - 2000' | * |
| Monday | Snow Level | 0' - 1000' | 0' - 1000' | 0' - 1000' | * |
| Mt. Baker | Elevation |
|---|---|
| Saturday Night |
Snow Level 0' - 1000' (Easterly Flow *) |
| Sunday |
Snow Level 0' - 1000' (Easterly Flow *) |
| Sunday Night |
Snow Level 0' - 1000' (Easterly Flow *) |
| Monday |
Snow Level 0' - 1000' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Saturday Night |
Snow Level 0' - 1000' (Easterly Flow *) |
| Sunday |
Snow Level 0' - 1000' (Easterly Flow *) |
| Sunday Night |
Snow Level 0' - 1000' (Easterly Flow *) |
| Monday |
Snow Level 0' - 1000' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Saturday Night |
Snow Level 1000' - 2000' (Easterly Flow *) |
| Sunday |
Snow Level 1000' - 2000' (Easterly Flow *) |
| Sunday Night |
Snow Level 1000' - 2000' (Easterly Flow *) |
| Monday |
Snow Level 0' - 1000' (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 21, 2019
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