Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
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 light snow mainly to the Washington Cascades on Monday morning. Snow will become showery following a weak frontal passage this morning. Snow shower activity may be enhanced in a convergence zone likely to form early this evening somewhere between Stevens and Snoqualmie passes. Moderate crest-level westerly winds will gradually increase today into the evening hours.
Tonight, 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 | Decreasing clouds, becoming partly cloudy by afternoon. |
| 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 | Light snow becoming showery in the afternoon. |
| Tuesday Night | Decreasing light snow showers, heaviest in convergence possible between Stevens and Snoqualmie during the early evening hours. |
| Wednesday | Increasing southerly low-level flow bringing increasing light to moderate snow to most areas with moderate snow in areas favored by southerly flow, such as the Mt. Rainier and Mt. Baker. Increasing crest-level winds becoming moderate to occasionally strong. |
| Wednesday Night | 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. |
East Slopes of the Washington Cascades
| Tuesday | Light snow changing to snow showers, mainly near the Cascade crest. |
| Tuesday Night | Decreasing light snow showers. |
| Wednesday | Increasing southerly low-level flow bringing increasing light snow and increasing 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 | Increasing clouds, becoming mostly cloudy with a chance of a snow shower. |
| Tuesday Night | Cloudy with a chance of light snow. |
| Wednesday | Light snow developing and becoming moderate by afternoon. Light to moderate winds becoming moderate by afternoon. |
| Wednesday Night | Light to moderate snow with moderate to strong ridge-top winds decreasing after midnight. |
Issued: 7:42 AM 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 | 0 - 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: 7:42 AM 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.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Previous forecast from Feb 23, 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.