Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k
Weather Synopsis for Monday & Tuesday
A strong and high amplitude upper ridge has moved east of the Cascades with a ridge axis on Monday morning from Idaho into the Canadian Rockies. The ridge will provide one more day of warm temperatures as high clouds provide filtered sunlight to most areas on Monday. Overnight lows Sunday night were above freezing at all stations west of the Cascade crest. East of the Cascade crest and in the passes, overnight lows were in the upper twenties to mid-thirties with easterly winds at the passes. On Monday, inversion conditions east of the Cascade Crest should continue to keep cooler air, low clouds and fog in the forecast with moderate easterly winds bringing the cooler air through the passes.
On Monday night, a weakening cold front will arrive around midnight in the Olympics and in the early morning hours along the Cascades bringing a brief period of light to moderate precipitation. The cold front should moderate the airmass from the unseasonal warmth we've seen with the high pressure system.
On Tuesday, in the wake of the weakening cold front, an associated upper trough will bring light rain and snow showers, mainly to the Cascade west slopes and Olympics. The trough lifts northward as it progresses eastward, allowing warmer air to work into the forecast zones and reducing instability, generally cutting off precipitation from south to north on Tuesday afternoon.
Tuesday night should feature fair weather and increasing high clouds as a stronger frontal system will be approaching the Pacific Northwest coastal waters.
Weather Forecast
Olympics
| Monday | Filtered sunlight with high clouds and warm temperatures. Clouds thickening and lowering in the afternoon. |
| Monday Night | Periods of light and occasionally moderate rain or snow, mainly after midnight. Snow line lowering overnight. Windy. |
| Tuesday | Light rain and snow showers, ending late in the day. |
| Tuesday Night | Increasing and lowering clouds with rain and snow arriving by daybreak. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Monday | High clouds bringing filtered sunshine with cloud cover increasing in the afternoon. Low clouds and cooler with inversion conditions at the passes. |
| Monday Night | Increasing clouds with light to moderate rain and snow in the early morning hours. |
| Tuesday | Light rain and snow showers, mainly volcanoes and North Cascades. Becoming mostly cloudy in the afternoon. |
| Tuesday Night | Some lingering low clouds in the north Cascades before midnight. Otherwise, increasing high clouds, thickening by morning. |
East Slopes of the Washington Cascades
| Monday | Filtered sunshine with high clouds; low clouds and cooler with inversion conditions at low elevations. |
| Monday Night | Clouds lowering with light rain or high elevation snow in the early morning hours. Possible wintry mix in some deeper valleys. |
| Tuesday | Cloudy in the morning with isolated rain and snow showers in the north, mainly high elevations; becoming partly sunny in the south and mostly cloudy in the north by the afternoon. |
| Tuesday Night | Lingering clouds in the north, decreasing. High clouds increasing. |
Mt. Hood
| Monday | High clouds bringing filtered sunshine with cloud cover increasing in the afternoon. |
| Monday Night | Light rain or snow after midnight. Snow line lowering overnight. |
| Tuesday | Light rain and snow showers decreasing or ending in the afternoon. |
| Tuesday Night | Increasing high clouds. |
Issued: 7:42 AM PST Monday, January 15, 2018
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Monday Morning | Freezing Level * | 10000' | 10000' | 10500' | ' | ' | 10500' | ' | 10000' |
| Monday Afternoon | Freezing Level * | 9000' | 10000' | 10000' | ' | ' | 10000' | ' | 9500' |
| Monday Night | Snow Level * | 5000' | 5500' | 5000' | ' | ' | 5500' | ' | 5500' |
| Tuesday Morning | Snow Level * | 3500' | 4000' | 4000' | ' | ' | 4000' | ' | 4000' |
| Tuesday Afternoon | Snow Level * | 3500' | 3500' | 3500' | ' | ' | 3500' | ' | 4000' |
| Tuesday Night | Snow Level * | 4500' | 3000' | 3000' | ' | ' | 3000' | ' | 6000' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Morning |
Freezing Level 10000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 9000' (Easterly Flow *) |
| Monday Night |
Snow Level 5000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 3500' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 3500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 4500' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Monday Morning |
Freezing Level 10000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 10000' (Easterly Flow *) |
| Monday Night |
Snow Level 5500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 4000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 3500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 3000' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Monday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 10000' (Easterly Flow *) |
| Monday Night |
Snow Level 5000' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 4000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 3500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 3000' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Monday Morning |
Freezing Level ' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Tuesday Morning |
Snow Level ' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level ' (Easterly Flow *) |
| Tuesday Night |
Snow Level ' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Monday Morning |
Freezing Level ' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Tuesday Morning |
Snow Level ' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level ' (Easterly Flow *) |
| Tuesday Night |
Snow Level ' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 10000' (Easterly Flow *) |
| Monday Night |
Snow Level 5500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 4000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 3500' (Easterly Flow *) |
| Tuesday Night |
Snow Level 3000' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Morning |
Freezing Level ' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Monday Night |
Snow Level ' (Easterly Flow *) |
| Tuesday Morning |
Snow Level ' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level ' (Easterly Flow *) |
| Tuesday Night |
Snow Level ' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Monday Morning |
Freezing Level 10000' (Easterly Flow *) |
| Monday Afternoon |
Freezing Level 9500' (Easterly Flow *) |
| Monday Night |
Snow Level 5500' (Easterly Flow *) |
| Tuesday Morning |
Snow Level 4000' (Easterly Flow *) |
| Tuesday Afternoon |
Snow Level 4000' (Easterly Flow *) |
| Tuesday Night |
Snow Level 6000' (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
| Tuesday | Tuesday | |
|---|---|---|
| Hurricane Ridge | 0.25 - 0.50 | LT 0.25 |
| Mt Baker Ski Area | LT 0.25 | 0.50 - 0.75 |
| Washington Pass | LT 0.10 | 0.25 - 0.50 |
| Stevens Pass | LT 0.10 | LT 0.25 |
| Snoqualmie Pass | LT 0.25 | LT 0.25 |
| Mission Ridge | LT 0.10 | LT 0.25 |
| Crystal Mt | LT 0.25 | LT 0.25 |
| Paradise | LT 0.25 | 0 - 0.50 |
| White Pass | LT 0.10 | LT 0.25 |
| Mt Hood Meadows | LT 0.25 | LT 0.25 |
| Timberline | LT 0.25 | LT 0.25 |
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 Monday, January 15, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Morning | ESE 5 - 15 | SE 10 - 20 | E 15 - 25 | --- - | ESE 10 - 20 |
| Monday Afternoon | SE 20 - 30 | ESE 10 - 20 | ESE 20 - 30 | --- - | SE 15 - 25 |
| Monday Night | S 25 - 35 | SE 15 - 25 | E 15 - 25 | --- - | SE 15 - 25 |
| Tuesday Morning | SSW 15 - 25 | S 20 - 30 | SW 15 - 25 | --- - | SW 20 - 30 |
| Tuesday Afternoon | SW 15 - 25 | S 10 - 20 | SW 20 - 30 | --- - | SW 15 - 25 |
| Tuesday Night | S 10 - 20 | S 10 - 20 | SW 10 - 20 | --- - | S 10 - 20 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Morning | ESE 5 - 15 |
| Monday Afternoon | SE 20 - 30 |
| Monday Night | S 25 - 35 |
| Tuesday Morning | SSW 15 - 25 |
| Tuesday Afternoon | SW 15 - 25 |
| Tuesday Night | S 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Monday Morning | SE 10 - 20 |
| Monday Afternoon | ESE 10 - 20 |
| Monday Night | SE 15 - 25 |
| Tuesday Morning | S 20 - 30 |
| Tuesday Afternoon | S 10 - 20 |
| Tuesday Night | S 10 - 20 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Morning | E 15 - 25 |
| Monday Afternoon | ESE 20 - 30 |
| Monday Night | E 15 - 25 |
| Tuesday Morning | SW 15 - 25 |
| Tuesday Afternoon | SW 20 - 30 |
| Tuesday Night | SW 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Monday Morning | ESE 10 - 20 |
| Monday Afternoon | SE 15 - 25 |
| Monday Night | SE 15 - 25 |
| Tuesday Morning | SW 20 - 30 |
| Tuesday Afternoon | SW 15 - 25 |
| Tuesday Night | S 10 - 20 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Morning | ESE 5 - 15 |
| Monday Afternoon | SE 20 - 30 |
| Monday Night | S 25 - 35 |
| Tuesday Morning | SSW 15 - 25 |
| Tuesday Afternoon | SW 15 - 25 |
| Tuesday Night | S 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Morning | SE 10 - 20 |
| Monday Afternoon | ESE 10 - 20 |
| Monday Night | SE 15 - 25 |
| Tuesday Morning | S 20 - 30 |
| Tuesday Afternoon | S 10 - 20 |
| Tuesday Night | S 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Morning | E 15 - 25 |
| Monday Afternoon | ESE 20 - 30 |
| Monday Night | E 15 - 25 |
| Tuesday Morning | SW 15 - 25 |
| Tuesday Afternoon | SW 20 - 30 |
| Tuesday Night | SW 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Morning | ESE 10 - 20 |
| Monday Afternoon | SE 15 - 25 |
| Monday Night | SE 15 - 25 |
| Tuesday Morning | SW 20 - 30 |
| Tuesday Afternoon | SW 15 - 25 |
| Tuesday Night | S 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.
Free Winds at 9000' (mph)
| Mt. Baker | Washington Pass | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Morning | SSE 15 - 25 | SSE 15 - 25 | S 20 - 30 | --- - | S 20 - 30 |
| Monday Night | S 30 - 40 | S 25 - 35 | SSW 30 - 40 | --- - | SSW 30 - 40 |
| Monday Afternoon | S 25 - 35 | S 25 - 35 | S 25 - 35 | --- - | S 30 - 40 |
| Tuesday Morning | SSW 25 - 35 | S 30 - 40 | SSW 30 - 40 | --- - | SSW 35 - 45 |
| Tuesday Afternoon | SW 25 - 35 | SW 25 - 35 | SW 30 - 40 | --- - | WSW 30 - 40 |
| Tuesday Night | SW 20 - 30 | SW 20 - 30 | SW 30 - 40 | --- - | SW 25 - 35 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Morning | SSE 15 - 25 |
| Monday Night | S 30 - 40 |
| Monday Afternoon | S 25 - 35 |
| Tuesday Morning | SSW 25 - 35 |
| Tuesday Afternoon | SW 25 - 35 |
| Tuesday Night | SW 20 - 30 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Morning | SSE 15 - 25 |
| Monday Night | S 25 - 35 |
| Monday Afternoon | S 25 - 35 |
| Tuesday Morning | S 30 - 40 |
| Tuesday Afternoon | SW 25 - 35 |
| Tuesday Night | SW 20 - 30 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Morning | S 20 - 30 |
| Monday Night | SSW 30 - 40 |
| Monday Afternoon | S 25 - 35 |
| Tuesday Morning | SSW 30 - 40 |
| Tuesday Afternoon | SW 30 - 40 |
| Tuesday Night | SW 30 - 40 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Morning | --- - |
| Monday Night | --- - |
| Monday Afternoon | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Morning | S 20 - 30 |
| Monday Night | SSW 30 - 40 |
| Monday Afternoon | S 30 - 40 |
| Tuesday Morning | SSW 35 - 45 |
| Tuesday Afternoon | WSW 30 - 40 |
| Tuesday Night | SW 25 - 35 |
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 Jan 13, 2018
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