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 & Monday
High amplitude ridging positioned offshore and extending into SE Alaska will keep the Pacific Northwest high and dry through the short term. Strong surface high pressure in southern British Columbia along with relatively cold air along the east slopes will funnel through the Cascade passes with offshore (easterly) gradients. Warm temperatures will continue in the alpine, while cool temperature inversions for the east slopes of the Cascades, near the Cascades Passes and affected areas of Mt. Hood area will continue through Tuesday morning. Easterly flow should weaken later Tuesday and freezing levels and lower mountain temperatures in the aforementioned areas should "pop" tomorrow afternoon. A weak frontal system will approach from the west Tuesday night.
Weather Forecast
Olympics, Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes and Mt. Hood
| Monday - Tuesday Morning |
Mostly clear. Mild in the alpine, locally cooler near the Cascade Passes and Mt. Hood areas exposed to easterly flow. |
| Tuesday Afternoon - Tuesday Night |
Mostly clear and mild. |
East slopes of the Washington Cascades
| Monday - Tuesday Morning |
Mostly clear. Gradual warming, temperature inversions lower and mid slopes. |
| Tuesday Afternoon - Tuesday Night |
Mostly clear and warmer. |
Issued: 7:41 AM PST Monday, February 16, 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 * | 8500' | 5000' | 3000' | ' | ' | 5500' | ' | 9500' |
| Monday Afternoon - Tuesday Morning | Freezing Level * | 10500' | 7500' | 5500' | ' | ' | 9000' | ' | 11000' |
| Tuesday Afternoon | Freezing Level * | 12000' | 11500' | 10000' | ' | ' | 12000' | ' | 12500' |
| Tuesday Night | Freezing Level | 10000' | 8500' | 7000' | ' | ' | 9000' | ' | 11000' |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Morning |
Freezing Level 8500' (Easterly Flow *) |
| Monday Afternoon - Tuesday Morning |
Freezing Level 10500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 12000' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 10000' |
| Mt. Baker | Elevation |
|---|---|
| Monday Morning |
Freezing Level 5000' (Easterly Flow *) |
| Monday Afternoon - Tuesday Morning |
Freezing Level 7500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 11500' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 8500' |
| Washington Pass | Elevation |
|---|---|
| Monday Morning |
Freezing Level 3000' (Easterly Flow *) |
| Monday Afternoon - Tuesday Morning |
Freezing Level 5500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 10000' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 7000' |
| Leavenworth | Elevation |
|---|---|
| Monday Morning |
Freezing Level ' (Easterly Flow *) |
| Monday Afternoon - Tuesday Morning |
Freezing Level ' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Tuesday Night |
Freezing Level ' |
| Stevens Pass | Elevation |
|---|---|
| Monday Morning |
Freezing Level ' (Easterly Flow *) |
| Monday Afternoon - Tuesday Morning |
Freezing Level ' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Tuesday Night |
Freezing Level ' |
| Snoqualmie Pass | Elevation |
|---|---|
| Monday Morning |
Freezing Level 5500' (Easterly Flow *) |
| Monday Afternoon - Tuesday Morning |
Freezing Level 9000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 12000' (Easterly Flow *) |
| Tuesday Night |
Freezing Level 9000' |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Monday Morning |
Freezing Level ' (Easterly Flow *) |
| Monday Afternoon - Tuesday Morning |
Freezing Level ' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level ' (Easterly Flow *) |
| Tuesday Night |
Freezing Level ' |
| Mt. Hood | Elevation |
|---|---|
| Monday Morning |
Freezing Level 9500' (Easterly Flow *) |
| Monday Afternoon - Tuesday Morning |
Freezing Level 11000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 12500' (Easterly Flow *) |
| Tuesday Night |
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 | Monday | |
|---|---|---|
| Hurricane Ridge | LT 0.10 | LT 0.10 |
| Mt Baker Ski Area | LT 0.10 | LT 0.10 |
| Washington Pass | LT 0.10 | LT 0.10 |
| Stevens Pass | LT 0.10 | LT 0.10 |
| Snoqualmie Pass | LT 0.10 | 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: 7:41 AM PST Monday, February 16, 2015
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Monday Morning | ENE 10 - 20 | NE 10 - 20 | E 15 - 30 | --- - | E 15 - 30 |
| Monday Afternoon | ENE 5 - 15 | NE 5 - 15 | E 10 - 20 | --- - | E 10 - 20 |
| Monday Night - Tuesday Morning | ENE 5 - 15 | NE 0 - 10 | E 15 - 30 | --- - | E 10 - 20 |
| Tuesday Afternoon | S 0 - 10 | SE 0 - 10 | SE 10 - 20 | --- - | SW 0 - 10 |
| Tuesday Night | SW 10 - 20 | S 10 - 20 | SW 10 - 20 | --- - | SW 5 - 15 |
| Hurricane Ridge | Elevation |
|---|---|
| Monday Morning | ENE 10 - 20 |
| Monday Afternoon | ENE 5 - 15 |
| Monday Night - Tuesday Morning | ENE 5 - 15 |
| Tuesday Afternoon | S 0 - 10 |
| Tuesday Night | SW 10 - 20 |
| Mt. Baker | Elevation |
|---|---|
| Monday Morning | NE 10 - 20 |
| Monday Afternoon | NE 5 - 15 |
| Monday Night - Tuesday Morning | NE 0 - 10 |
| Tuesday Afternoon | SE 0 - 10 |
| Tuesday Night | S 10 - 20 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Monday Morning | E 15 - 30 |
| Monday Afternoon | E 10 - 20 |
| Monday Night - Tuesday Morning | E 15 - 30 |
| Tuesday Afternoon | SE 10 - 20 |
| 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 | E 15 - 30 |
| Monday Afternoon | E 10 - 20 |
| Monday Night - Tuesday Morning | E 10 - 20 |
| Tuesday Afternoon | SW 0 - 10 |
| Tuesday Night | SW 5 - 15 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Monday Morning | ENE 10 - 20 |
| Monday Afternoon | ENE 5 - 15 |
| Monday Night - Tuesday Morning | ENE 5 - 15 |
| Tuesday Afternoon | S 0 - 10 |
| Tuesday Night | SW 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Morning | NE 10 - 20 |
| Monday Afternoon | NE 5 - 15 |
| Monday Night - Tuesday Morning | NE 0 - 10 |
| Tuesday Afternoon | SE 0 - 10 |
| Tuesday Night | S 10 - 20 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Morning | E 15 - 30 |
| Monday Afternoon | E 10 - 20 |
| Monday Night - Tuesday Morning | E 15 - 30 |
| Tuesday Afternoon | SE 10 - 20 |
| 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 | E 15 - 30 |
| Monday Afternoon | E 10 - 20 |
| Monday Night - Tuesday Morning | E 10 - 20 |
| Tuesday Afternoon | SW 0 - 10 |
| Tuesday Night | SW 5 - 15 |
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 | N 15 - 25 | N 15 - 25 | N 15 - 25 | --- - | NNE 10 - 20 |
| Monday Afternoon - Tuesday Morning | N 10 - 20 | N 10 - 20 | N 10 - 20 | --- - | N 5 - 15 |
| Tuesday Afternoon - Tuesday Evening | NW 5 - 15 | NW 5 - 15 | NW 5 - 15 | --- - | W 0 - 10 |
| Tuesday Night | SW 15 - 25 | SW 15 - 25 | WSW 20 - 30 | --- - | WSW 15 - 25 |
| Mt. Baker | Direction - Speed |
|---|---|
| Monday Morning | N 15 - 25 |
| Monday Afternoon - Tuesday Morning | N 10 - 20 |
| Tuesday Afternoon - Tuesday Evening | NW 5 - 15 |
| Tuesday Night | SW 15 - 25 |
| Washington Pass | Direction - Speed |
|---|---|
| Monday Morning | N 15 - 25 |
| Monday Afternoon - Tuesday Morning | N 10 - 20 |
| Tuesday Afternoon - Tuesday Evening | NW 5 - 15 |
| Tuesday Night | SW 15 - 25 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Monday Morning | N 15 - 25 |
| Monday Afternoon - Tuesday Morning | N 10 - 20 |
| Tuesday Afternoon - Tuesday Evening | NW 5 - 15 |
| Tuesday Night | WSW 20 - 30 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Monday Morning | --- - |
| Monday Afternoon - Tuesday Morning | --- - |
| Tuesday Afternoon - Tuesday Evening | --- - |
| Tuesday Night | --- - |
| Mt. Hood | Direction - Speed |
|---|---|
| Monday Morning | NNE 10 - 20 |
| Monday Afternoon - Tuesday Morning | N 5 - 15 |
| Tuesday Afternoon - Tuesday Evening | W 0 - 10 |
| Tuesday Night | WSW 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: 7:41 AM PST Monday, February 16, 2015
Extended Weather Synopsis for Monday night through Monday
The weak frontal system should temporarily flatten the upper level ridge Wednesday, producing light rain and snow showers for the Olympics and west slopes of the Cascades at with relatively cooler snow levels. The Mt. Hood area and the east slopes should see little to no precipitaiton from this frontal system.
An upper level shortwave will pass through in NW flow on Thursday, mainly keeping light showers in the forecast for the north Cascades. The upper level ridge will rebuild around 135 W Thursday night and Friday... with a drying and clearing trend taking place and likely extending through next weekend.
Extended Weather
Olympics, Washington Cascades near and west of the crest including Stevens, Snoqualmie, and White Passes
Wednesday - ThursdayMostly cloudy with light rain and snow showers. Cooler.
Thursday Night - FridayPartly to mostly clear.
East slopes of the Washington Cascades and Mt. Hood
Wednesday - ThursdayPartly to mostly cloudy with a chance of light rain and snow showers. Cooler.
Thursday Night - FridayMostly clear.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Wednesday | Snow Level | 4500' - 5500' | 5000' - 6000' | 7000' - 8000' | |
| Wednesday Night - Thursday Night | Snow Level | 4000' - 5000' | 4000' - 5000' | 5000' - 6000' | |
| Friday | Freezing Level | 4000' - 5000' | 4500' - 5500' | 5000' - 6000' |
| Mt. Baker | Elevation |
|---|---|
| Wednesday |
Snow Level 4500' - 5500' |
| Wednesday Night - Thursday Night |
Snow Level 4000' - 5000' |
| Friday |
Freezing Level 4000' - 5000' |
| Snoqualmie Pass | Elevation |
|---|---|
| Wednesday |
Snow Level 5000' - 6000' |
| Wednesday Night - Thursday Night |
Snow Level 4000' - 5000' |
| Friday |
Freezing Level 4500' - 5500' |
| Mt. Hood | Elevation |
|---|---|
| Wednesday |
Snow Level 7000' - 8000' |
| Wednesday Night - Thursday Night |
Snow Level 5000' - 6000' |
| Friday |
Freezing 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 Feb 11, 2015
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.