Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Friday & Thursday
A flat upper level ridge over the eastern North Pacific directed a very shallow trough inland across southern British Columbia on Friday and the trough now sits east of the forecast area, with with a moist westerly flow and decreasing light rain and snow showers in its wake. Locally enhanced rain or snow may develop during the afternoon and last into the overnight hours near Snoqualmie Pass. LClouds extend southward to the Mt. Hood area. Skies have cleared in the Hurricane Ridge area and partial clearing is expected in the north Cascades by evening. Moderate crest-level winds should decrease in the afternoon, becoming light overnight on Friday.
Temperatures will continue to be significantly warmer in the southern part of the forecast area. Mid-elevations on Mt. Hood may not see temperatures drop below freezing on Friday night.
On Saturday, weak ridging develops over southern British Columbia. Some lingering clouds in the morning will give way to mostly clear skies. Winds will be light.
Saturday night a trough moving south down the northern British Columbia coastline will increase clouds with temperatures dropping sharply behind a cold frontal passage during the early morning hours on Sunday. W-NW winds will increase into the moderate range at crest-level.
Weather Forecast
Olympics
| Friday | Partly cloudy. |
| Friday Night | Clearing skies. |
| Saturday | Mostly sunny. |
| Saturday Night | Increasing clouds after midnight. |
Washington Cascades near and west of the Crest including Stevens, Snoqualmie and White Passes
| Friday | Light rain and snow showers will continue into the overnight hours, mainly in the central and north Cascades, with possibly convergence possibly developing near Snoqualmie Pass. |
| Friday Night | Mostly cloudy with a chance of light rain or snow in convergence, central part. Elsewhere mostly clear skies. |
| Saturday | Mostly sunny. |
| Saturday Night | Clear skies in the evening with increasing clouds after midnight and a slight chance of light rain or Snow developing along the west slopes of the North Cascades. |
East Slopes of the Washington Cascades
| Friday | Mostly cloudy near the Cascade crest, but mostly sunny farther east. |
| Friday Night | Partly cloudy central part. Elsewhere, mostly clear skies. |
| Saturday | Mostly sunny. |
| Saturday Night | Clear skies in the evening with increasing clouds after midnight. |
Mt. Hood
| Friday | A mix of sun and clouds. Warm. |
| Friday Night | A mix of sun and clouds. Mild. |
| Saturday | Mostly sunny. Warm. |
| Saturday Night | Increasing clouds by morning. |
Issued: 2:35 PM PDT Friday, March 30, 2018
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Friday Afternoon | Snow Level | 5000' | 4000' | 5000' | ' | ' | 4000' | ' | 6500' |
| Friday Night | Snow Level | 4000' | 3500' | 3500' | ' | ' | 4000' | ' | 6000' |
| Saturday Morning | Freezing Level | 4500' | 4500' | 4000' | ' | ' | 4500' | ' | 5000' |
| Saturday Afternoon | Freezing Level | 5000' | 5500' | 6000' | ' | ' | 6000' | ' | 7000' |
| Saturday Night | Snow Level | 5000' | 5000' | 5000' | ' | ' | 5000' | ' | 6500' |
| Hurricane Ridge | Elevation |
|---|---|
| Friday Afternoon |
Snow Level 5000' |
| Friday Night |
Snow Level 4000' |
| Saturday Morning |
Freezing Level 4500' |
| Saturday Afternoon |
Freezing Level 5000' |
| Saturday Night |
Snow Level 5000' |
| Mt. Baker | Elevation |
|---|---|
| Friday Afternoon |
Snow Level 4000' |
| Friday Night |
Snow Level 3500' |
| Saturday Morning |
Freezing Level 4500' |
| Saturday Afternoon |
Freezing Level 5500' |
| Saturday Night |
Snow Level 5000' |
| Washington Pass | Elevation |
|---|---|
| Friday Afternoon |
Snow Level 5000' |
| Friday Night |
Snow Level 3500' |
| Saturday Morning |
Freezing Level 4000' |
| Saturday Afternoon |
Freezing Level 6000' |
| Saturday Night |
Snow Level 5000' |
| Leavenworth | Elevation |
|---|---|
| Friday Afternoon |
Snow Level ' |
| Friday Night |
Snow Level ' |
| Saturday Morning |
Freezing Level ' |
| Saturday Afternoon |
Freezing Level ' |
| Saturday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Friday Afternoon |
Snow Level ' |
| Friday Night |
Snow Level ' |
| Saturday Morning |
Freezing Level ' |
| Saturday Afternoon |
Freezing Level ' |
| Saturday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Friday Afternoon |
Snow Level 4000' |
| Friday Night |
Snow Level 4000' |
| Saturday Morning |
Freezing Level 4500' |
| Saturday Afternoon |
Freezing Level 6000' |
| Saturday Night |
Snow Level 5000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Friday Afternoon |
Snow Level ' |
| Friday Night |
Snow Level ' |
| Saturday Morning |
Freezing Level ' |
| Saturday Afternoon |
Freezing Level ' |
| Saturday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Friday Afternoon |
Snow Level 6500' |
| Friday Night |
Snow Level 6000' |
| Saturday Morning |
Freezing Level 5000' |
| Saturday Afternoon |
Freezing Level 7000' |
| Saturday Night |
Snow Level 6500' |
* 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 | Thursday | |
|---|---|---|
| Hurricane Ridge | LT 0.10 | LT 0.10 |
| Mt Baker Ski Area | LT 0.25 | LT 0.10 |
| Washington Pass | LT 0.10 | LT 0.10 |
| Stevens Pass | LT 0.10 | LT 0.10 |
| Snoqualmie Pass | LT 0.25 | LT 0.10 |
| Mission Ridge | LT 0.10 | LT 0.10 |
| Crystal Mt | LT 0.10 | LT 0.10 |
| Paradise | LT 0.10 | LT 0.10 |
| White Pass | LT 0.10 | LT 0.10 |
| Mt Hood Meadows | LT 0.10 | LT 0.10 |
| Timberline | LT 0.10 | LT 0.10 |
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: 2:35 PM PDT Friday, March 30, 2018
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Friday Afternoon | WSW 10 - 20 | WSW 5 - 15 | W 15 - 25 | --- - | W 20 - 30 |
| Friday Night | W 0 - 10 | W 0 - 10 | W 0 - 10 | --- - | W 10 - 20 |
| Saturday Morning | S 0 - 10 | VAR 0 - 10 | VAR 0 - 10 | --- - | W 10 - 20 |
| Saturday Afternoon | WSW 5 - 15 | WSW 5 - 15 | W 5 - 15 | --- - | W 10 - 20 |
| Saturday Night | WSW 15 - 25 | WSW 15 - 25 | WSW 15 - 25 | --- - | WSW 20 - 30 |
| Hurricane Ridge | Elevation |
|---|---|
| Friday Afternoon | WSW 10 - 20 |
| Friday Night | W 0 - 10 |
| Saturday Morning | S 0 - 10 |
| Saturday Afternoon | WSW 5 - 15 |
| Saturday Night | WSW 15 - 25 |
| Mt. Baker | Elevation |
|---|---|
| Friday Afternoon | WSW 5 - 15 |
| Friday Night | W 0 - 10 |
| Saturday Morning | VAR 0 - 10 |
| Saturday Afternoon | WSW 5 - 15 |
| Saturday Night | WSW 15 - 25 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Friday Afternoon | W 15 - 25 |
| Friday Night | W 0 - 10 |
| Saturday Morning | VAR 0 - 10 |
| Saturday Afternoon | W 5 - 15 |
| Saturday Night | WSW 15 - 25 |
| Mt. Rainier | Elevation |
|---|---|
| Friday Afternoon | --- - |
| Friday Night | --- - |
| Saturday Morning | --- - |
| Saturday Afternoon | --- - |
| Saturday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Friday Afternoon | W 20 - 30 |
| Friday Night | W 10 - 20 |
| Saturday Morning | W 10 - 20 |
| Saturday Afternoon | W 10 - 20 |
| Saturday Night | WSW 20 - 30 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Friday Afternoon | WSW 10 - 20 |
| Friday Night | W 0 - 10 |
| Saturday Morning | S 0 - 10 |
| Saturday Afternoon | WSW 5 - 15 |
| Saturday Night | WSW 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Friday Afternoon | WSW 5 - 15 |
| Friday Night | W 0 - 10 |
| Saturday Morning | VAR 0 - 10 |
| Saturday Afternoon | WSW 5 - 15 |
| Saturday Night | WSW 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Friday Afternoon | W 15 - 25 |
| Friday Night | W 0 - 10 |
| Saturday Morning | VAR 0 - 10 |
| Saturday Afternoon | W 5 - 15 |
| Saturday Night | WSW 15 - 25 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Friday Afternoon | --- - |
| Friday Night | --- - |
| Saturday Morning | --- - |
| Saturday Afternoon | --- - |
| Saturday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Friday Afternoon | W 20 - 30 |
| Friday Night | W 10 - 20 |
| Saturday Morning | W 10 - 20 |
| Saturday Afternoon | W 10 - 20 |
| Saturday Night | WSW 20 - 30 |
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 | |
|---|---|---|---|---|---|
| Friday Afternoon | W 20 - 30 | W 25 - 35 | W 35 - 50 | --- - | W 30 - 40 |
| Friday Night | W 15 - 25 | W 10 - 20 | W 25 - 35 | --- - | W 15 - 25 |
| Saturday Morning | W 10 - 20 | W 10 - 20 | W 10 - 20 | --- - | W 20 - 30 |
| Saturday Afternoon | WSW 15 - 25 | WSW 15 - 25 | WSW 20 - 30 | --- - | WSW 20 - 30 |
| Saturday Night | WSW 25 - 35 | WSW 25 - 35 | WSW 30 - 40 | --- - | WSW 30 - 40 |
| Mt. Baker | Direction - Speed |
|---|---|
| Friday Afternoon | W 20 - 30 |
| Friday Night | W 15 - 25 |
| Saturday Morning | W 10 - 20 |
| Saturday Afternoon | WSW 15 - 25 |
| Saturday Night | WSW 25 - 35 |
| Washington Pass | Direction - Speed |
|---|---|
| Friday Afternoon | W 25 - 35 |
| Friday Night | W 10 - 20 |
| Saturday Morning | W 10 - 20 |
| Saturday Afternoon | WSW 15 - 25 |
| Saturday Night | WSW 25 - 35 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Friday Afternoon | W 35 - 50 |
| Friday Night | W 25 - 35 |
| Saturday Morning | W 10 - 20 |
| Saturday Afternoon | WSW 20 - 30 |
| Saturday Night | WSW 30 - 40 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Friday Afternoon | --- - |
| Friday Night | --- - |
| Saturday Morning | --- - |
| Saturday Afternoon | --- - |
| Saturday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Friday Afternoon | W 30 - 40 |
| Friday Night | W 15 - 25 |
| Saturday Morning | W 20 - 30 |
| Saturday Afternoon | WSW 20 - 30 |
| Saturday Night | WSW 30 - 40 |
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: 2:35 PM PDT Friday, March 30, 2018
Extended Weather Synopsis for Thursday night through Thursday
The southward-moving trough will remain over the region. The associated upper low will track into southern British Columbia and stall as winds wrapping around become moderate to occasionally strong out of the west at crest-level in the Cascades with generally cooling temperatures through Sunday and Sunday night as the cold front pushes south and east.
On Monday, a northwest flow with gradually decreasing moisture replaces the trough which shifts eastward. Overnight on Monday the flow shifts more westerly with continued moisture.
On Tuesday, ahead of a system approaching from the SW, the moist flow will shift north of our forecast area, leaving a mostly dry day.
Extended Weather
Olympics, Washington Cascades and Mt. Hood Area
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Sunday | Snow Level | 1000' - 2000' | 1500' - 2500' | 3000' - 4000' | |
| Sunday Night | Snow Level | 500' - 1500' | 500' - 1500' | 500' - 1500' | |
| Monday | Snow Level | 2000' - 3000' | 2000' - 3000' | 2500' - 3500' | |
| Monday Night | Snow Level | 1000' - 2000' | 1000' - 2000' | 2500' - 3500' | |
| Tuesday | Snow Level | 2000' - 3000' | 2500' - 4500' | 5000' - 6000' |
| Mt. Baker | Elevation |
|---|---|
| Sunday |
Snow Level 1000' - 2000' |
| Sunday Night |
Snow Level 500' - 1500' |
| Monday |
Snow Level 2000' - 3000' |
| Monday Night |
Snow Level 1000' - 2000' |
| Tuesday |
Snow Level 2000' - 3000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday |
Snow Level 1500' - 2500' |
| Sunday Night |
Snow Level 500' - 1500' |
| Monday |
Snow Level 2000' - 3000' |
| Monday Night |
Snow Level 1000' - 2000' |
| Tuesday |
Snow Level 2500' - 4500' |
| Mt. Hood | Elevation |
|---|---|
| Sunday |
Snow Level 3000' - 4000' |
| Sunday Night |
Snow Level 500' - 1500' |
| Monday |
Snow Level 2500' - 3500' |
| Monday Night |
Snow Level 2500' - 3500' |
| Tuesday |
Snow Level 5000' - 6000' |
* 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 Mar 30, 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.