Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Monday night through Friday
We are sitting on the backside of a longwave trough with cool NW flow aloft. The trough itself is shearing apart between two upper low centers, one positioned over the Canadian Rockies, the other off the California coast. The main weather impact is that instability associated with the trough has shifted to the inland NW, so most of the cloud cover over the region is due to the buildup of cumulus/stratocumulus along the west slopes of the Cascades and Olympics with clearer conditions along the eastern slopes of the Cascades.
A flat upper level ridge will begin to shift closer to the Pacific Northwest over the next two days with warmer air waiting to flood the region. The warming will be gradual and should only make inroads in the Mt. Hood area on Tuesday. Cool NW flow aloft will keep freezing levels relatively cool over Washington state one more day with a similarly mixed bag of cloud cover along the western slopes of the Cascades, similar to what we experienced Monday. For nearly all areas, alpine winds from the NW will increase and become strong tonight and continue through Tuesday. Look for breezing moderate westerly winds at Pass level again Tuesday afternoon and evening as onshore flow peaks.
On Wednesday, the offshore upper level ridge will begin to amplify and shift closer to us, resulting in clearer skies and higher freezing levels across the board. Freezing levels across southern Washington and Mt. Hood should top out near or above 10,000'. Look for widespread mountain temperatures in the 40s and even 50s.
Weather Forecast
Hurricane Ridge
| Monday Night | Partly cloudy with areas of low clouds. |
| Tuesday | Partly sunny. |
Mt. Baker
| Monday Night | Partly to mostly cloudy with areas of low clouds. Strong alpine NW winds. |
| Tuesday | Partly sunny. Strong alpine NW winds. |
Washington Pass and Leavenworth
| Monday Night | Mostly clear. Strong alpine NW winds. |
| Tuesday | Mostly sunny. Strong alpine NW winds. |
Stevens and Snoqualmie Pass
| Monday Night | Partly to mostly cloudy with areas of low clouds. Strong NW alpine winds. Moderate west winds at Pass level. |
| Tuesday | Partly sunny. Strong alpine NW winds. Moderate west winds at Pass level. |
Mt. Rainier, Crystal and White Pass
| Monday Night | Partly to mostly cloudy with areas of low clouds. |
| Tuesday | Partly sunny. Strong alpine NW winds. |
Mt. Hood
| Monday Night | Partly to mostly cloudy with areas of low clouds. |
| Tuesday | Partly sunny with areas of low clouds in the morning, becoming mostly sunny in the afternoon. |
Issued: 1:48 PM PDT Monday, April 6, 2020
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Monday Evening | Freezing Level | 5000' | 3500' | 4000' | 5000' | 4500' | 4500' | 4500' | 6000' |
| Monday Night | Freezing Level | 3500' | 2500' | 2500' | 5000' | 2500' | 2500' | 2500' | 6500' |
| Tuesday Morning | Freezing Level | 4500' | 4000' | 4500' | 5500' | 4000' | 4000' | 4000' | 7500' |
| Tuesday Afternoon | Freezing Level | 5500' | 5000' | 5500' | 6000' | 5000' | 5000' | 5500' | 8500' |
| Tuesday Evening | Freezing Level | 5500' | 4000' | 4000' | 5000' | 4500' | 4500' | 6500' | 8500' |
| Tuesday Night | Freezing Level | 6000' | 3000' | 3000' | 4000' | 3500' | 3500' | 7500' | 8500' |
| Wednesday Morning | Freezing Level | 8000' | 5500' | 5000' | 6000' | 6500' | 7000' | 8000' | 9500' |
| Wednesday Afternoon | Freezing Level | 10000' | 7500' | 7500' | 8000' | 8500' | 9000' | 10000' | 11000' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Evening |
Freezing Level 5000' |
| Monday Night |
Freezing Level 3500' |
| Tuesday Morning |
Freezing Level 4500' |
| Tuesday Afternoon |
Freezing Level 5500' |
| Tuesday Evening |
Freezing Level 5500' |
| Tuesday Night |
Freezing Level 6000' |
| Wednesday Morning |
Freezing Level 8000' |
| Wednesday Afternoon |
Freezing Level 10000' |
| Mt. Baker | Elevation |
|---|---|
| Monday Evening |
Freezing Level 3500' |
| Monday Night |
Freezing Level 2500' |
| Tuesday Morning |
Freezing Level 4000' |
| Tuesday Afternoon |
Freezing Level 5000' |
| Tuesday Evening |
Freezing Level 4000' |
| Tuesday Night |
Freezing Level 3000' |
| Wednesday Morning |
Freezing Level 5500' |
| Wednesday Afternoon |
Freezing Level 7500' |
| Washington Pass | Elevation |
|---|---|
| Monday Evening |
Freezing Level 4000' |
| Monday Night |
Freezing Level 2500' |
| Tuesday Morning |
Freezing Level 4500' |
| Tuesday Afternoon |
Freezing Level 5500' |
| Tuesday Evening |
Freezing Level 4000' |
| Tuesday Night |
Freezing Level 3000' |
| Wednesday Morning |
Freezing Level 5000' |
| Wednesday Afternoon |
Freezing Level 7500' |
| Leavenworth | Elevation |
|---|---|
| Monday Evening |
Freezing Level 5000' |
| Monday Night |
Freezing Level 5000' |
| Tuesday Morning |
Freezing Level 5500' |
| Tuesday Afternoon |
Freezing Level 6000' |
| Tuesday Evening |
Freezing Level 5000' |
| Tuesday Night |
Freezing Level 4000' |
| Wednesday Morning |
Freezing Level 6000' |
| Wednesday Afternoon |
Freezing Level 8000' |
| Stevens Pass | Elevation |
|---|---|
| Monday Evening |
Freezing Level 4500' |
| Monday Night |
Freezing Level 2500' |
| Tuesday Morning |
Freezing Level 4000' |
| Tuesday Afternoon |
Freezing Level 5000' |
| Tuesday Evening |
Freezing Level 4500' |
| Tuesday Night |
Freezing Level 3500' |
| Wednesday Morning |
Freezing Level 6500' |
| Wednesday Afternoon |
Freezing Level 8500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Evening |
Freezing Level 4500' |
| Monday Night |
Freezing Level 2500' |
| Tuesday Morning |
Freezing Level 4000' |
| Tuesday Afternoon |
Freezing Level 5000' |
| Tuesday Evening |
Freezing Level 4500' |
| Tuesday Night |
Freezing Level 3500' |
| Wednesday Morning |
Freezing Level 7000' |
| Wednesday Afternoon |
Freezing Level 9000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Evening |
Freezing Level 4500' |
| Monday Night |
Freezing Level 2500' |
| Tuesday Morning |
Freezing Level 4000' |
| Tuesday Afternoon |
Freezing Level 5500' |
| Tuesday Evening |
Freezing Level 6500' |
| Tuesday Night |
Freezing Level 7500' |
| Wednesday Morning |
Freezing Level 8000' |
| Wednesday Afternoon |
Freezing Level 10000' |
| Mt. Hood | Elevation |
|---|---|
| Monday Evening |
Freezing Level 6000' |
| Monday Night |
Freezing Level 6500' |
| Tuesday Morning |
Freezing Level 7500' |
| Tuesday Afternoon |
Freezing Level 8500' |
| Tuesday Evening |
Freezing Level 8500' |
| Tuesday Night |
Freezing Level 8500' |
| Wednesday Morning |
Freezing Level 9500' |
| Wednesday Afternoon |
Freezing Level 11000' |
* 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
| Monday Night | Friday | Friday Night | Friday | |
|---|---|---|---|---|
| 4 pm - 4 am | 4 am - 4 pm | 4 pm - 4 am | 4 am - 4 pm | |
| Hurricane Ridge | 0 | 0 | 0 | 0 |
| Mt Baker Ski Area | 0 | 0 | 0 | 0 |
| Washington Pass | 0 | 0 | 0 | 0 |
| Leavenworth | 0 | 0 | 0 | 0 |
| Stevens Pass | 0 | 0 | 0 | 0 |
| Snoqualmie Pass | 0 | 0 | 0 | 0 |
| Mission Ridge | 0 | 0 | 0 | 0 |
| Crystal Mt | 0 | 0 | 0 | 0 |
| Paradise | 0 | 0 | 0 | 0 |
| White Pass | 0 | 0 | 0 | 0 |
| Mt Hood Meadows | 0 | 0 | 0 | 0 |
| Timberline | 0 | 0 | 0 | 0 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Paradise | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| White Pass | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
| Timberline | Precipitation Forecast |
|---|---|
| Monday Night | 0 |
| Friday | 0 |
| Friday Night | 0 |
| Friday | 0 |
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: 1:48 PM PDT Monday, April 6, 2020
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Evening | SW 5 - 15 | SW 10 - 20 | W 15 - 25 | W 10 - 20 | W 10 - 20 |
| Monday Night | W 5 - 15 | SW 10 - 20 | W 10 - 20 | W 5 - 15 | NW 10 - 20 |
| Tuesday Morning | W 0 - 10 | SW 5 - 15 | NW 5 - 15 | W 5 - 15 | NW 10 - 20 |
| Tuesday Afternoon | W 5 - 15 | WSW 10 - 20 | NW 10 - 20 | NW 10 - 20 | NW 15 - 25 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Evening | SW 5 - 15 |
| Monday Night | W 5 - 15 |
| Tuesday Morning | W 0 - 10 |
| Tuesday Afternoon | W 5 - 15 |
| Mt. Baker | Elevation |
|---|---|
| Monday Evening | SW 10 - 20 |
| Monday Night | SW 10 - 20 |
| Tuesday Morning | SW 5 - 15 |
| Tuesday Afternoon | WSW 10 - 20 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Evening | W 15 - 25 |
| Monday Night | W 10 - 20 |
| Tuesday Morning | NW 5 - 15 |
| Tuesday Afternoon | NW 10 - 20 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Evening | W 10 - 20 |
| Monday Night | W 5 - 15 |
| Tuesday Morning | W 5 - 15 |
| Tuesday Afternoon | NW 10 - 20 |
| Mt. Hood | Elevation |
|---|---|
| Monday Evening | W 10 - 20 |
| Monday Night | NW 10 - 20 |
| Tuesday Morning | NW 10 - 20 |
| Tuesday Afternoon | NW 15 - 25 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Evening | SW 5 - 15 |
| Monday Night | W 5 - 15 |
| Tuesday Morning | W 0 - 10 |
| Tuesday Afternoon | W 5 - 15 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Evening | SW 10 - 20 |
| Monday Night | SW 10 - 20 |
| Tuesday Morning | SW 5 - 15 |
| Tuesday Afternoon | WSW 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Evening | W 15 - 25 |
| Monday Night | W 10 - 20 |
| Tuesday Morning | NW 5 - 15 |
| Tuesday Afternoon | NW 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Evening | W 10 - 20 |
| Monday Night | W 5 - 15 |
| Tuesday Morning | W 5 - 15 |
| Tuesday Afternoon | NW 10 - 20 |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Evening | W 10 - 20 |
| Monday Night | NW 10 - 20 |
| Tuesday Morning | NW 10 - 20 |
| Tuesday Afternoon | NW 15 - 25 |
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 Evening | NW 25 - 35 | NW 25 - 35 | NW 30 - 40 | NW 20 - 30 | NW 10 - 20 |
| Monday Night | NW 30 - 40 | NW 40 - 50 | NW 40 - 50 | NW 30 - 40 | NW 20 - 30 |
| Tuesday Morning | NW 35 - 45 | NW 35 - 45 | NW 40 - 50 | NW 30 - 40 | NW 20 - 30 |
| Tuesday Afternoon | NW 20 - 30 | NW 20 - 30 | NW 35 - 45 | NW 25 - 35 | NW 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Evening | NW 25 - 35 |
| Monday Night | NW 30 - 40 |
| Tuesday Morning | NW 35 - 45 |
| Tuesday Afternoon | NW 20 - 30 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Evening | NW 25 - 35 |
| Monday Night | NW 40 - 50 |
| Tuesday Morning | NW 35 - 45 |
| Tuesday Afternoon | NW 20 - 30 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Evening | NW 30 - 40 |
| Monday Night | NW 40 - 50 |
| Tuesday Morning | NW 40 - 50 |
| Tuesday Afternoon | NW 35 - 45 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Evening | NW 20 - 30 |
| Monday Night | NW 30 - 40 |
| Tuesday Morning | NW 30 - 40 |
| Tuesday Afternoon | NW 25 - 35 |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Evening | NW 10 - 20 |
| Monday Night | NW 20 - 30 |
| Tuesday Morning | NW 20 - 30 |
| Tuesday Afternoon | NW 15 - 25 |
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: 1:48 PM PDT Monday, April 6, 2020
Extended Weather Synopsis for Friday night through Friday
The upper level ridge will shift into British Columbia on Thursday, allowing freezing levels and overall warmth to peak Wednesday night through Thursday. Forecast models disagree just how much high cloud cover will waft over the northern half of Washington State on Thursday. Beginning Thursday night, a slight cooling trend will start as a weak upper level disturbance upstream in NW flow aloft begins to flatten the upper level ridge. Depending on the speed of the upper level shortwave, scattered showers may develop over the Washington Cascades and Olympics by Friday afternoon while the Mt. Hood area stays relatively drier and warmer than areas further north.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Wednesday Night | Freezing Level | 9000' - 10000' | 10000' - 11000' | 11000' - 12000' | |
| Thursday | Freezing Level | 9500' - 10500' | 10500' - 11500' | 11000' - 12000' | |
| Thursday Night | Freezing Level | 6500' - 7500' | 9000' - 10000' | 11000' - 12000' | |
| Friday | Freezing Level | 6000' - 7000' | 6500' - 7500' | 10000' - 11000' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday Night |
Freezing Level 9000' - 10000' |
| Thursday |
Freezing Level 9500' - 10500' |
| Thursday Night |
Freezing Level 6500' - 7500' |
| Friday |
Freezing Level 6000' - 7000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday Night |
Freezing Level 10000' - 11000' |
| Thursday |
Freezing Level 10500' - 11500' |
| Thursday Night |
Freezing Level 9000' - 10000' |
| Friday |
Freezing Level 6500' - 7500' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday Night |
Freezing Level 11000' - 12000' |
| Thursday |
Freezing Level 11000' - 12000' |
| Thursday Night |
Freezing Level 11000' - 12000' |
| Friday |
Freezing Level 10000' - 11000' |
* 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 Apr 5, 2020
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