Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Tuesday & Saturday
A cool weather pattern continues with a weak disturbance following a similar track to recent storms, arriving in W-NW flow aloft Tuesday with generally W flow at lower levels. The system is bringing periods of light snow on Tuesday and post-frontal snow showers will continue through the afternoon with enhanced snowfall rates in convergence zone likely to form early this evening somewhere between Stevens and Snoqualmie passes. Moderate crest-level westerly winds will peak during the afternoon hours.
Tonight, upper level flow will become westerly as a significant trough digs into the near coastal waters and an associated surface low drops south from Alaska.
On Wednesday, the digging trough offshore will produce W-SW flow aloft and an offshore gradient will develop at lower levels, producing light to moderate easterly flow across the Cascades. A stronger cold front will approach and bring increasing light snow and increasing moderate crest-level winds, particularly during the afternoon hours.
On Wednesday evening, the surface front will cross the forecast zones bringing moderate to strong winds and moderate snow with a slight rise in snow level. Precipitation will become showery after the frontal passage and should become light to moderate after midnight with decreasing winds and a cooling trend.
Weather Forecast
Olympics
| Tuesday | Mostly cloudy. |
| Tuesday Night | Partly to mostly cloudy. |
| Wednesday | Partly cloudy with light snow developing in the afternoon. |
| Wednesday Night | Light to moderate snow in the evening, ending after midnight. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Tuesday | Cloudy with snow showers, heaviest in convergence late in the day in the central Cascades. |
| Tuesday Night | Decreasing light snow showers, heaviest in convergence possible between Stevens and Snoqualmie during the early evening hours. |
| Wednesday | Light snow developing in the morning, becoming moderate in the afternoon. Increasing southerly crest-level winds becoming moderate to occasionally strong. |
| Wednesday Night | Moderate snow, especially in areas favored by southerly flow such as Mt. Rainier and Mt. Baker. Precipitation decreasing after midnight. Moderate to strong south and southeast wind in the evening, decreasing after midnight. |
East Slopes of the Washington Cascades
| Tuesday | Snow showers near the crest with decreasing clouds to the east. |
| Tuesday Night | Decreasing light snow showers at high elevations. |
| Wednesday | Light snow developing from south to north during the day and increasing southerly winds becoming moderate to occasionally strong. |
| Wednesday Night | Light to moderate snow, especially in areas favored by southerly flow, decreasing after midnight. Moderate to strong south and southeast wind in the evening, decreasing after midnight. |
Mt. Hood
| Tuesday | Cloudy with a mix of freezing drizzle and light snow showers. |
| Tuesday Night | Cloudy with a chance of light snow. |
| Wednesday | Light snow developing early and becoming moderate by afternoon. Light to moderate winds becoming moderate by afternoon. |
| Wednesday Night | Light to moderate snow decreasing after midnight with moderate to strong ridge-top winds decreasing after midnight. |
Issued: 2:32 PM PST Tuesday, February 27, 2018
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Tuesday Morning | Snow Level | 2000' | 1500' | 1000' | ' | ' | 1500' | ' | 1000' |
| Tuesday Afternoon | Snow Level | 2000' | 2000' | 2000' | ' | ' | 2000' | ' | 2000' |
| Tuesday Night | Snow Level | 1500' | 1500' | 1000' | ' | ' | 1000' | ' | 2000' |
| Wednesday Morning | Snow Level * | 2000' | 2000' | 1000' | ' | ' | 2000' | ' | 2500' |
| Wednesday Afternoon | Snow Level * | 2500' | 2000' | 2000' | ' | ' | 2000' | ' | 3000' |
| Wednesday Night | Snow Level * | 1500' | 2500' | 1500' | ' | ' | 2000' | ' | 3000' |
| Hurricane Ridge | Elevation |
|---|---|
| Tuesday Morning |
Snow Level 2000' |
| Tuesday Afternoon |
Snow Level 2000' |
| Tuesday Night |
Snow Level 1500' |
| Wednesday Morning |
Snow Level 2000' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level 2500' (Easterly Flow *) |
| Wednesday Night |
Snow Level 1500' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Morning |
Snow Level 1500' |
| Tuesday Afternoon |
Snow Level 2000' |
| Tuesday Night |
Snow Level 1500' |
| Wednesday Morning |
Snow Level 2000' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level 2000' (Easterly Flow *) |
| Wednesday Night |
Snow Level 2500' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Tuesday Morning |
Snow Level 1000' |
| Tuesday Afternoon |
Snow Level 2000' |
| Tuesday Night |
Snow Level 1000' |
| Wednesday Morning |
Snow Level 1000' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level 2000' (Easterly Flow *) |
| Wednesday Night |
Snow Level 1500' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Wednesday Morning |
Snow Level ' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level ' (Easterly Flow *) |
| Wednesday Night |
Snow Level ' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Wednesday Morning |
Snow Level ' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level ' (Easterly Flow *) |
| Wednesday Night |
Snow Level ' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Morning |
Snow Level 1500' |
| Tuesday Afternoon |
Snow Level 2000' |
| Tuesday Night |
Snow Level 1000' |
| Wednesday Morning |
Snow Level 2000' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level 2000' (Easterly Flow *) |
| Wednesday Night |
Snow Level 2000' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Wednesday Morning |
Snow Level ' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level ' (Easterly Flow *) |
| Wednesday Night |
Snow Level ' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Morning |
Snow Level 1000' |
| Tuesday Afternoon |
Snow Level 2000' |
| Tuesday Night |
Snow Level 2000' |
| Wednesday Morning |
Snow Level 2500' (Easterly Flow *) |
| Wednesday Afternoon |
Snow Level 3000' (Easterly Flow *) |
| Wednesday Night |
Snow Level 3000' (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
| Saturday | Saturday | |
|---|---|---|
| Hurricane Ridge | LT 0.10 | 0 - 0.50 |
| Mt Baker Ski Area | LT 0.25 | 1.00 - 1.50 |
| Washington Pass | LT 0.25 | 0.25 - 0.50 |
| Stevens Pass | 0 - 0.50 | LT 0.25 |
| Snoqualmie Pass | 0.50 - 0.75 | 0.50 - 0.75 |
| Mission Ridge | LT 0.10 | 0 - 0.50 |
| Crystal Mt | LT 0.10 | 0.75 - 1.00 |
| Paradise | 0.25 - 0.50 | 1.00 - 1.50 |
| White Pass | LT 0.25 | 0.25 - 0.50 |
| Mt Hood Meadows | LT 0.25 | 0.75 - 1.00 |
| Timberline | LT 0.25 | 0 - 1.00 |
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: 2:32 PM PST Tuesday, February 27, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Tuesday Morning | WSW 20 - 30 | SW 20 - 30 | W 20 - 30 | --- - | W 15 - 25 |
| Tuesday Afternoon | WSW 20 - 30 | SW 15 - 25 | WSW 25 - 35 | --- - | W 20 - 30 |
| Tuesday Night | SW 10 - 20 | SSW 10 - 20 | WSW 15 - 25 | --- - | WSW 15 - 25 |
| Wednesday Morning | SSE 15 - 25 | SSE 15 - 25 | ESE 10 - 20 | --- - | SSW 15 - 25 |
| Wednesday Afternoon | SSE 25 - 35 | ESE 25 - 35 | ESE 20 - 30 | --- - | SSW 25 - 35 |
| Wednesday Night | SW 10 - 20 | ESE 25 - 35 | SSE 30 - 40 | --- - | S 35 - 50 |
| Hurricane Ridge | Elevation |
|---|---|
| Tuesday Morning | WSW 20 - 30 |
| Tuesday Afternoon | WSW 20 - 30 |
| Tuesday Night | SW 10 - 20 |
| Wednesday Morning | SSE 15 - 25 |
| Wednesday Afternoon | SSE 25 - 35 |
| Wednesday Night | SW 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Morning | SW 20 - 30 |
| Tuesday Afternoon | SW 15 - 25 |
| Tuesday Night | SSW 10 - 20 |
| Wednesday Morning | SSE 15 - 25 |
| Wednesday Afternoon | ESE 25 - 35 |
| Wednesday Night | ESE 25 - 35 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Morning | W 20 - 30 |
| Tuesday Afternoon | WSW 25 - 35 |
| Tuesday Night | WSW 15 - 25 |
| Wednesday Morning | ESE 10 - 20 |
| Wednesday Afternoon | ESE 20 - 30 |
| Wednesday Night | SSE 30 - 40 |
| Mt. Rainier | Elevation |
|---|---|
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Morning | W 15 - 25 |
| Tuesday Afternoon | W 20 - 30 |
| Tuesday Night | WSW 15 - 25 |
| Wednesday Morning | SSW 15 - 25 |
| Wednesday Afternoon | SSW 25 - 35 |
| Wednesday Night | S 35 - 50 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Tuesday Morning | WSW 20 - 30 |
| Tuesday Afternoon | WSW 20 - 30 |
| Tuesday Night | SW 10 - 20 |
| Wednesday Morning | SSE 15 - 25 |
| Wednesday Afternoon | SSE 25 - 35 |
| Wednesday Night | SW 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Tuesday Morning | SW 20 - 30 |
| Tuesday Afternoon | SW 15 - 25 |
| Tuesday Night | SSW 10 - 20 |
| Wednesday Morning | SSE 15 - 25 |
| Wednesday Afternoon | ESE 25 - 35 |
| Wednesday Night | ESE 25 - 35 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Tuesday Morning | W 20 - 30 |
| Tuesday Afternoon | WSW 25 - 35 |
| Tuesday Night | WSW 15 - 25 |
| Wednesday Morning | ESE 10 - 20 |
| Wednesday Afternoon | ESE 20 - 30 |
| Wednesday Night | SSE 30 - 40 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Tuesday Morning | W 15 - 25 |
| Tuesday Afternoon | W 20 - 30 |
| Tuesday Night | WSW 15 - 25 |
| Wednesday Morning | SSW 15 - 25 |
| Wednesday Afternoon | SSW 25 - 35 |
| Wednesday Night | S 35 - 50 |
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 | |
|---|---|---|---|---|---|
| Tuesday Morning | W 30 - 40 | WSW 40 - 60 | W 35 - 50 | --- - | NW 25 - 35 |
| Tuesday Afternoon | WSW 25 - 35 | WSW 35 - 50 | W 35 - 50 | --- - | NW 35 - 50 |
| Tuesday Night | W 20 - 30 | W 20 - 30 | W 30 - 40 | --- - | W 30 - 40 |
| Wednesday Morning | SSW 15 - 25 | SSW 10 - 20 | SSW 25 - 35 | --- - | SW 25 - 35 |
| Wednesday Afternoon | SSW 30 - 40 | SSW 25 - 35 | SW 35 - 50 | --- - | SW 35 - 50 |
| Wednesday Night | S 45 - 65 | SSE 35 - 50 | SSW 45 - 65 | --- - | SSW 50 - 70 |
| Mt. Baker | Direction - Speed |
|---|---|
| Tuesday Morning | W 30 - 40 |
| Tuesday Afternoon | WSW 25 - 35 |
| Tuesday Night | W 20 - 30 |
| Wednesday Morning | SSW 15 - 25 |
| Wednesday Afternoon | SSW 30 - 40 |
| Wednesday Night | S 45 - 65 |
| Washington Pass | Direction - Speed |
|---|---|
| Tuesday Morning | WSW 40 - 60 |
| Tuesday Afternoon | WSW 35 - 50 |
| Tuesday Night | W 20 - 30 |
| Wednesday Morning | SSW 10 - 20 |
| Wednesday Afternoon | SSW 25 - 35 |
| Wednesday Night | SSE 35 - 50 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Tuesday Morning | W 35 - 50 |
| Tuesday Afternoon | W 35 - 50 |
| Tuesday Night | W 30 - 40 |
| Wednesday Morning | SSW 25 - 35 |
| Wednesday Afternoon | SW 35 - 50 |
| Wednesday Night | SSW 45 - 65 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Wednesday Morning | --- - |
| Wednesday Afternoon | --- - |
| Wednesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Tuesday Morning | NW 25 - 35 |
| Tuesday Afternoon | NW 35 - 50 |
| Tuesday Night | W 30 - 40 |
| Wednesday Morning | SW 25 - 35 |
| Wednesday Afternoon | SW 35 - 50 |
| Wednesday Night | SSW 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: 2:32 PM PST Tuesday, February 27, 2018
Extended Weather Synopsis for Saturday night through Saturday
On Thursday, the closed low and upper trough will be gradually moving south and slightly east into our near shore waters, bringing a continued cooling trend along with an unstable air mass producing intermittent bands of energy and precipitation north and east across our region as the low pressure center spins offshore. Light to moderate southerly winds.
On Thursday night through Saturday, as the low drops south of our region, these bands will continue spiral around the low pressure and may result in patchy significant accumulations of snow over this period with other areas receiving very little snow and potentially and cool weather. Expect an overall drying trend during this period with southeast winds on Thursday night generally becoming light and variable Friday through Saturday.
Extended Weather
Olympics, Washington Cascades and Mt. Hood Area
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Thursday | Snow Level | 1500' - 2500' | 1500' - 2500' | 2000' - 3000' | |
| Thursday Night | Snow Level | 1500' - 2500' | 1500' - 2500' | 1000' - 2000' | |
| Friday | Snow Level | 1500' - 2500' | 1500' - 2500' | 2000' - 3000' | |
| Friday Night | Snow Level | 1000' - 2000' | 1000' - 2000' | 1000' - 2000' | |
| Saturday | Snow Level | 1500' - 2500' | 1500' - 2500' | 1500' - 2500' |
| Mt. Baker | Elevation |
|---|---|
| Thursday |
Snow Level 1500' - 2500' |
| Thursday Night |
Snow Level 1500' - 2500' |
| Friday |
Snow Level 1500' - 2500' |
| Friday Night |
Snow Level 1000' - 2000' |
| Saturday |
Snow Level 1500' - 2500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Thursday |
Snow Level 1500' - 2500' |
| Thursday Night |
Snow Level 1500' - 2500' |
| Friday |
Snow Level 1500' - 2500' |
| Friday Night |
Snow Level 1000' - 2000' |
| Saturday |
Snow Level 1500' - 2500' |
| Mt. Hood | Elevation |
|---|---|
| Thursday |
Snow Level 2000' - 3000' |
| Thursday Night |
Snow Level 1000' - 2000' |
| Friday |
Snow Level 2000' - 3000' |
| Friday Night |
Snow Level 1000' - 2000' |
| Saturday |
Snow Level 1500' - 2500' |
* 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 27, 2018
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