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 & Tuesday
The Pacific Northwest should be in for a day of fair weather with flat upper level ridging shifting east and a frontal system offshore around 130 W. Monday should feel like it could be Sunday's twin with mostly cloudy skies and periods of light rain and snow for the north Cascades and Olympics transitioning to partly to mostly sunny skies for areas further south like White Pass and Mt. Hood. Snow/freezing levels will generally be on the mild side.
The front should pass through the Cascades early Tuesday morning... and usher in a much cooler weather regime for the remainder of the week as long-wave troughing and much colder air aloft settles over the region. Post-frontal and orographic showers on Tuesday should allow for some accumulations especially along the west slopes.
A Puget Sound convergence zone is likely to form mid-day Tuesday and locally enhance snowfall totals somewhere in the Snoqualmie to Stevens vicinity. The air mass will become unstable Tuesday afternoon and early evening... and there is a chance of thunderstorms in the forecast.
Weather Forecast
Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
| Monday |
Mostly cloudy north Cascades with a chance of light rain or snow in the afternoon. Partly sunny with periods of filtered sunshine central and south Washington Cascades. |
| Monday Evening |
Cloudy with light rain and snow developing late evening. |
| Monday Night - Tuesday Morning |
Light to occasionally moderate rain and snow turning to showers early Tuesday morning. Cooling trend. |
| Tuesday Afternoon - Tuesday Night |
Mostly cloudy with light to moderate rain and snow showers, with heavier showers near a potential Puget Sound convergence zone between Snoqualmie and Stevens Pass. Chance of thunderstorms Tuesday afternoon and evening. |
Olympics
| Monday |
Mostly cloudy with periods of light rain or snow. |
| Monday Evening |
Cloudy with light rain and snow. |
| Monday Night - Tuesday Morning |
Light to occasionally moderate rain and snow turning to showers early Tuesday morning. Cooling trend. |
| Tuesday Afternoon - Tuesday Night |
Mostly cloudy with light to moderate rain and snow showers. Chance of thunderstorms Tuesday afternoon and evening. |
East slopes of the Washington Cascades
| Monday |
Mostly cloudy northeast Cascades with a chance of very light rain or snow in the afternoon. Partly to mostly sunny with periods of filtered sunshine central and southeast Washington Cascades. |
| Monday Evening |
Increasing clouds. |
| Monday Night - Tuesday Morning |
Light rain and snow turning to showers early Tuesday morning. Cooling trend. |
| Tuesday Afternoon - Tuesday Night |
Mostly cloudy with light to occasionally moderate rain and snow showers near the Cascade crest. Chance of thunderstorms Tuesday afternoon and evening near the Cascade crest. |
Mt. Hood Area
| Monday |
Mostly sunny with periods of filtered sunshine. Mild. |
| Monday Evening |
Increasing clouds. |
| Monday Night - Tuesday Morning |
Light to occasionally moderate rain and snow turning to showers early Tuesday morning. Cooling trend. |
| Tuesday Afternoon - Tuesday Night |
Mostly cloudy with light to moderate rain and snow showers. Chance of thunderstorms Tuesday afternoon and evening. |
Issued: 8:19 AM PDT Monday, March 30, 2015
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 | 6500' | 6500' | 6000' | ' | ' | 7000' | ' | 10000' |
| Monday Afternoon | Freezing Level | 7000' | 7500' | 8000' | ' | ' | 8500' | ' | 10000' |
| Monday Evening | Snow Level | 5500' | 6000' | 6500' | ' | ' | 6000' | ' | 6500' |
| Monday Night - Tuesday Morning | Snow Level | 3500' | 4000' | 4500' | ' | ' | 4000' | ' | 4500' |
| Tuesday Afternoon | Snow Level | 3500' | 3500' | 3500' | ' | ' | 3500' | ' | 3500' |
| Tuesday Night | Snow Level | 2500' | 2500' | 2500' | ' | ' | 2500' | ' | 2500' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Morning |
Freezing Level 6500' |
| Monday Afternoon |
Freezing Level 7000' |
| Monday Evening |
Snow Level 5500' |
| Monday Night - Tuesday Morning |
Snow Level 3500' |
| Tuesday Afternoon |
Snow Level 3500' |
| Tuesday Night |
Snow Level 2500' |
| Mt. Baker | Elevation |
|---|---|
| Monday Morning |
Freezing Level 6500' |
| Monday Afternoon |
Freezing Level 7500' |
| Monday Evening |
Snow Level 6000' |
| Monday Night - Tuesday Morning |
Snow Level 4000' |
| Tuesday Afternoon |
Snow Level 3500' |
| Tuesday Night |
Snow Level 2500' |
| Washington Pass | Elevation |
|---|---|
| Monday Morning |
Freezing Level 6000' |
| Monday Afternoon |
Freezing Level 8000' |
| Monday Evening |
Snow Level 6500' |
| Monday Night - Tuesday Morning |
Snow Level 4500' |
| Tuesday Afternoon |
Snow Level 3500' |
| Tuesday Night |
Snow Level 2500' |
| Leavenworth | Elevation |
|---|---|
| Monday Morning |
Freezing Level ' |
| Monday Afternoon |
Freezing Level ' |
| Monday Evening |
Snow Level ' |
| Monday Night - Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Stevens Pass | Elevation |
|---|---|
| Monday Morning |
Freezing Level ' |
| Monday Afternoon |
Freezing Level ' |
| Monday Evening |
Snow Level ' |
| Monday Night - Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Morning |
Freezing Level 7000' |
| Monday Afternoon |
Freezing Level 8500' |
| Monday Evening |
Snow Level 6000' |
| Monday Night - Tuesday Morning |
Snow Level 4000' |
| Tuesday Afternoon |
Snow Level 3500' |
| Tuesday Night |
Snow Level 2500' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Morning |
Freezing Level ' |
| Monday Afternoon |
Freezing Level ' |
| Monday Evening |
Snow Level ' |
| Monday Night - Tuesday Morning |
Snow Level ' |
| Tuesday Afternoon |
Snow Level ' |
| Tuesday Night |
Snow Level ' |
| Mt. Hood | Elevation |
|---|---|
| Monday Morning |
Freezing Level 10000' |
| Monday Afternoon |
Freezing Level 10000' |
| Monday Evening |
Snow Level 6500' |
| Monday Night - Tuesday Morning |
Snow Level 4500' |
| Tuesday Afternoon |
Snow Level 3500' |
| Tuesday Night |
Snow Level 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.
Precipitation Forecast
| Tuesday | Tuesday | |
|---|---|---|
| Hurricane Ridge | LT 0.25 | LT 0.25 |
| Mt Baker Ski Area | 0 - 0.50 | 0 - 0.50 |
| Washington Pass | LT 0.25 | LT 0.25 |
| Stevens Pass | LT 0.25 | 0.50 - 1.00 |
| Snoqualmie Pass | LT 0.25 | 0.50 - 1.00 |
| Mission Ridge | LT 0.10 | LT 0.10 |
| Crystal Mt | LT 0.10 | LT 0.25 |
| Paradise | LT 0.25 | 0.50 - 0.75 |
| White Pass | LT 0.25 | 0.25 - 0.50 |
| Mt Hood Meadows | 0.25 - 0.50 | 0 - 0.50 |
| Timberline | 0 - 0.50 | 0.50 - 0.75 |
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: 8:19 AM PDT Monday, March 30, 2015
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Morning | SW 10 - 20 | S 5 - 15 | SW 0 - 10 | --- - | SW 5 - 15 |
| Monday Afternoon | SSW 10 - 20 | S 10 - 20 | SW 5 - 15 | --- - | SW 5 - 15 |
| Monday Night | SW 15 - 25 | S 25 - 35 | SSW 10 - 20 | --- - | SW 20 - 30 |
| Tuesday Morning | W 15 - 25 | W 15 - 25 | WSW 15 - 25 | --- - | W 20 - 30 |
| Tuesday Afternoon - Tuesday Night | W 10 - 20 | WSW 10 - 20 | WSW 15 - 25 | --- - | W 15 - 25 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Morning | SW 10 - 20 |
| Monday Afternoon | SSW 10 - 20 |
| Monday Night | SW 15 - 25 |
| Tuesday Morning | W 15 - 25 |
| Tuesday Afternoon - Tuesday Night | W 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Monday Morning | S 5 - 15 |
| Monday Afternoon | S 10 - 20 |
| Monday Night | S 25 - 35 |
| Tuesday Morning | W 15 - 25 |
| Tuesday Afternoon - Tuesday Night | WSW 10 - 20 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Morning | SW 0 - 10 |
| Monday Afternoon | SW 5 - 15 |
| Monday Night | SSW 10 - 20 |
| Tuesday Morning | WSW 15 - 25 |
| Tuesday Afternoon - Tuesday Night | WSW 15 - 25 |
| Mt. Rainier | Elevation |
|---|---|
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon - Tuesday Night | --- - |
| Mt. Hood | Elevation |
|---|---|
| Monday Morning | SW 5 - 15 |
| Monday Afternoon | SW 5 - 15 |
| Monday Night | SW 20 - 30 |
| Tuesday Morning | W 20 - 30 |
| Tuesday Afternoon - Tuesday Night | W 15 - 25 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Morning | SW 10 - 20 |
| Monday Afternoon | SSW 10 - 20 |
| Monday Night | SW 15 - 25 |
| Tuesday Morning | W 15 - 25 |
| Tuesday Afternoon - Tuesday Night | W 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Morning | S 5 - 15 |
| Monday Afternoon | S 10 - 20 |
| Monday Night | S 25 - 35 |
| Tuesday Morning | W 15 - 25 |
| Tuesday Afternoon - Tuesday Night | WSW 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Morning | SW 0 - 10 |
| Monday Afternoon | SW 5 - 15 |
| Monday Night | SSW 10 - 20 |
| Tuesday Morning | WSW 15 - 25 |
| Tuesday Afternoon - Tuesday Night | WSW 15 - 25 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon - Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Morning | SW 5 - 15 |
| Monday Afternoon | SW 5 - 15 |
| Monday Night | SW 20 - 30 |
| Tuesday Morning | W 20 - 30 |
| Tuesday Afternoon - Tuesday Night | W 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 Morning | SW 15 - 25 | SW 15 - 25 | SW 15 - 25 | --- - | SW 25 - 35 |
| Monday Afternoon | SW 25 - 35 | SW 20 - 30 | SW 25 - 35 | --- - | SW 30 - 40 |
| Monday Night | SW 40 - 50 | SW 20 - 30 | SW 40 - 50 | --- - | SW 50 - 60 |
| Tuesday Morning | SW 25 - 35 | SW 30 - 40 | WSW 30 - 40 | --- - | SW 40 - 50 |
| Tuesday Afternoon - Tuesday Night | WNW 15 - 25 | WNW 20 - 30 | WNW 20 - 35 | --- - | WNW 25 - 35 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Morning | SW 15 - 25 |
| Monday Afternoon | SW 25 - 35 |
| Monday Night | SW 40 - 50 |
| Tuesday Morning | SW 25 - 35 |
| Tuesday Afternoon - Tuesday Night | WNW 15 - 25 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Morning | SW 15 - 25 |
| Monday Afternoon | SW 20 - 30 |
| Monday Night | SW 20 - 30 |
| Tuesday Morning | SW 30 - 40 |
| Tuesday Afternoon - Tuesday Night | WNW 20 - 30 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Morning | SW 15 - 25 |
| Monday Afternoon | SW 25 - 35 |
| Monday Night | SW 40 - 50 |
| Tuesday Morning | WSW 30 - 40 |
| Tuesday Afternoon - Tuesday Night | WNW 20 - 35 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Morning | --- - |
| Monday Afternoon | --- - |
| Monday Night | --- - |
| Tuesday Morning | --- - |
| Tuesday Afternoon - Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Morning | SW 25 - 35 |
| Monday Afternoon | SW 30 - 40 |
| Monday Night | SW 50 - 60 |
| Tuesday Morning | SW 40 - 50 |
| Tuesday Afternoon - Tuesday Night | WNW 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.
Issued: 8:19 AM PDT Monday, March 30, 2015
Extended Weather Synopsis for Tuesday night through Tuesday
Wednesday's weather should be very similar to Tuesday with a cool and somewhat unstable air mass over the region... except orographic showers should be a bit lighter along the west slopes Wednesday and flow aloft becoming more WNW. A shortwave trough passing through Wednesday evening may enhance shower activity during this time.
Weak upper level ridging will pass over the area on Thursday... with some trapped low level moisture and a few lingering showers likely along the west slopes and sunnier skies likely over the east slopes.
A frontal boundary will begin sliding south Thursday night and Friday... and current forecast models have the front draping over the Olympics and north Cascades by Friday afternoon... with increasing clouds elsewhere with slowing rising snow levels during the day.
Extended Weather
Olympics, Washington Cascades and Mt. Hood area
Mostly cloudy with light rain and snow showers, occasionally moderate west slopes of the Cascades and Mt. Hood. Chance of thunderstorms Wednesday afternoon and evening.
Partly to mostly cloudy with isolated light rain and snow showers along the west slopes of the Cascades and Mt. Hood.
Light rain and snow developing Olympics and north Cascades Thursday night and becoming light to moderate Friday. Cloudy elsewhere.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Wednesday - Friday Morning | Snow Level | 2500' - 4000' | 2500' - 4000' | 2500' - 4000' | |
| Friday Afternoon | Snow Level | 3500' - 4500' | 3500' - 4500' | 3500' - 4500' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday - Friday Morning |
Snow Level 2500' - 4000' |
| Friday Afternoon |
Snow Level 3500' - 4500' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday - Friday Morning |
Snow Level 2500' - 4000' |
| Friday Afternoon |
Snow Level 3500' - 4500' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday - Friday Morning |
Snow Level 2500' - 4000' |
| Friday Afternoon |
Snow Level 3500' - 4500' |
* 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 25, 2015
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