Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Weather Synopsis for Sunday night through Monday
A shortwave trough rotating up from the south has spread very light precipitation over the Mt. Hood region and the south Washington Cascades early this afternoon. Easterly flow up to crest level has added an upslope component to the precipitation, lowering cloud ceilings and squeezing out light snow along the east slopes of the Cascades as well. Light precipitation will spread to most areas this evening as the precipitation shield expands northward.
Snow levels are cooler than they were just a few days ago but still not cold by late December norms. Colder air will filter in later tonight as a surface low develops in eastern Washington and the winds switch from east to west late Sunday night into Monday.
Light showers should mainly affect the west slopes of the Cascades and Mt. Hood area Sunday night through Monday morning. A weak upper-level ridge will build over the area during the day Monday, but this will likely trap low level moisture for the same areas rather than lead to a full-scale clearing trend. There's a higher chance for sunshine for the Hurricane Ridge area and along the east slopes of the Cascades on Monday afternoon. The drying and clearing trend should continue Monday night. A weak front will approach the coast on Tuesday spreading high clouds inland during the day but otherwise dry and cool conditions are expected.
Weather Forecast
Hurricane Ridge
| Sunday Night | Periods of high clouds. |
| Monday | Partly sunny. |
Mt. Baker
| Sunday Night | Becoming cloudy with a chance for very light rain or snow. |
| Monday | Mostly cloudy with a chance of snow showers in the morning becoming partly to mostly cloudy in the afternoon. |
Washington Pass and Leavenworth
| Sunday Night | Cloudy. Periods of light snow. |
| Monday | Periods of light snow in the morning tapering off by late morning. Partly to mostly cloudy in the afternoon. |
Stevens and Snoqualmie Pass
| Sunday Night | Cloudy with periods of light rain or snow. |
| Monday | Cloudy with scattered light snow showers in the morning, becoming mostly cloudy in the afternoon. |
Mt. Rainier, Crystal and White Pass
| Sunday Night | Cloudy with periods of light rain or snow. |
| Monday | Cloudy with scattered light snow showers in the morning, becoming mostly cloudy in the afternoon. |
Mt. Hood
| Sunday Night | Light rain or snow. |
| Monday | Cloudy with scattered light snow showers in the morning, becoming mostly cloudy in the afternoon. |
Issued: 1:10 PM PST Sunday, December 22, 2019
Snow/Freezing Level (ft)
| Hurricane Ridge | Mt. Baker | Washington Pass | Leavenworth | Stevens Pass | Snoqualmie Pass | Mt. Rainier, Crystal & White Pass | Mt. Hood | ||
|---|---|---|---|---|---|---|---|---|---|
| Sunday Evening | Snow Level * | 3000' | 3000' | 2500' | 3000' | 2500' | 3000' | 3500' | 4000' |
| Sunday Night | Snow Level | 2000' | 2000' | 2000' | 2500' | 2000' | 2500' | 2500' | 3000' |
| Monday Morning | Snow Level | 2000' | 1500' | 2000' | 2000' | 2000' | 2500' | 2500' | 2500' |
| Monday Afternoon | Snow Level | 2000' | 1500' | 2000' | 2000' | 2000' | 2000' | 2000' | 3000' |
| Monday Evening | Freezing Level | 2000' | 1500' | 1500' | 1500' | 1500' | 1500' | 1500' | 2500' |
| Monday Night | Freezing Level | 2000' | 1000' | 1000' | 1000' | 1000' | 1000' | 1000' | 2000' |
| Tuesday Morning | Freezing Level * | 3000' | 2000' | 1500' | 2000' | 2000' | 2500' | 2500' | 3000' |
| Tuesday Afternoon | Freezing Level * | 3000' | 2000' | 1500' | 2000' | 2000' | 2500' | 2500' | 3000' |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Evening |
Snow Level 3000' (Easterly Flow *) |
| Sunday Night |
Snow Level 2000' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Freezing Level 2000' |
| Monday Night |
Freezing Level 2000' |
| Tuesday Morning |
Freezing Level 3000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 3000' (Easterly Flow *) |
| Mt. Baker | Elevation |
|---|---|
| Sunday Evening |
Snow Level 3000' (Easterly Flow *) |
| Sunday Night |
Snow Level 2000' |
| Monday Morning |
Snow Level 1500' |
| Monday Afternoon |
Snow Level 1500' |
| Monday Evening |
Freezing Level 1500' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 2000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 2000' (Easterly Flow *) |
| Washington Pass | Elevation |
|---|---|
| Sunday Evening |
Snow Level 2500' (Easterly Flow *) |
| Sunday Night |
Snow Level 2000' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Freezing Level 1500' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 1500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 1500' (Easterly Flow *) |
| Leavenworth | Elevation |
|---|---|
| Sunday Evening |
Snow Level 3000' (Easterly Flow *) |
| Sunday Night |
Snow Level 2500' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Freezing Level 1500' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 2000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 2000' (Easterly Flow *) |
| Stevens Pass | Elevation |
|---|---|
| Sunday Evening |
Snow Level 2500' (Easterly Flow *) |
| Sunday Night |
Snow Level 2000' |
| Monday Morning |
Snow Level 2000' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Freezing Level 1500' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 2000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 2000' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Sunday Evening |
Snow Level 3000' (Easterly Flow *) |
| Sunday Night |
Snow Level 2500' |
| Monday Morning |
Snow Level 2500' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Freezing Level 1500' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 2500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 2500' (Easterly Flow *) |
| Mt. Rainier & Crystal | Elevation |
|---|---|
| Sunday Evening |
Snow Level 3500' (Easterly Flow *) |
| Sunday Night |
Snow Level 2500' |
| Monday Morning |
Snow Level 2500' |
| Monday Afternoon |
Snow Level 2000' |
| Monday Evening |
Freezing Level 1500' |
| Monday Night |
Freezing Level 1000' |
| Tuesday Morning |
Freezing Level 2500' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 2500' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Sunday Evening |
Snow Level 4000' (Easterly Flow *) |
| Sunday Night |
Snow Level 3000' |
| Monday Morning |
Snow Level 2500' |
| Monday Afternoon |
Snow Level 3000' |
| Monday Evening |
Freezing Level 2500' |
| Monday Night |
Freezing Level 2000' |
| Tuesday Morning |
Freezing Level 3000' (Easterly Flow *) |
| Tuesday Afternoon |
Freezing Level 3000' (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
| Sunday Night | Monday | Monday Night | Monday | |
|---|---|---|---|---|
| 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 | LT 0.10 | 0 | 0 | 0 |
| Washington Pass | LT 0.25 | 0 | 0 | 0 |
| Leavenworth | LT 0.25 | 0 | 0 | 0 |
| Stevens Pass | LT 0.25 | LT 0.10 | 0 | 0 |
| Snoqualmie Pass | LT 0.25 | LT 0.10 | 0 | 0 |
| Mission Ridge | LT 0.25 | 0 | 0 | 0 |
| Crystal Mt | LT 0.25 | LT 0.10 | 0 | 0 |
| Paradise | LT 0.25 | LT 0.10 | 0 | 0 |
| White Pass | LT 0.25 | LT 0.10 | 0 | 0 |
| Mt Hood Meadows | 0.25 | LT 0.10 | 0 | 0 |
| Timberline | 0.25 | LT 0.10 | 0 | 0 |
| Hurricane Ridge | Precipitation Forecast |
|---|---|
| Sunday Night | 0 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Mt Baker Ski Area | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.10 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Washington Pass | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Leavenworth | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Stevens Pass | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Monday | LT 0.10 |
| Monday Night | 0 |
| Monday | 0 |
| Snoqualmie Pass | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Monday | LT 0.10 |
| Monday Night | 0 |
| Monday | 0 |
| Mission Ridge | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Monday | 0 |
| Monday Night | 0 |
| Monday | 0 |
| Crystal Mt | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Monday | LT 0.10 |
| Monday Night | 0 |
| Monday | 0 |
| Paradise | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Monday | LT 0.10 |
| Monday Night | 0 |
| Monday | 0 |
| White Pass | Precipitation Forecast |
|---|---|
| Sunday Night | LT 0.25 |
| Monday | LT 0.10 |
| Monday Night | 0 |
| Monday | 0 |
| Mt Hood Meadows | Precipitation Forecast |
|---|---|
| Sunday Night | 0.25 |
| Monday | LT 0.10 |
| Monday Night | 0 |
| Monday | 0 |
| Timberline | Precipitation Forecast |
|---|---|
| Sunday Night | 0.25 |
| Monday | LT 0.10 |
| Monday Night | 0 |
| Monday | 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: 1:10 PM PST Sunday, December 22, 2019
Free Winds at 5000' (mph)
| Hurricane Ridge | Mt. Baker | Stevens to Snoqualmie Pass | Mt. Rainier | Mt. Hood | |
|---|---|---|---|---|---|
| Sunday Evening | ENE 0 - 10 | NE 5 - 15 | E 10 - 20 | SE 5 - 15 | SW 10 - 20 |
| Sunday Night | W 0 - 10 | NW 0 - 10 | W 10 - 20 | W 10 - 20 | W 15 - 25 |
| Monday Morning | SW 0 - 10 | W 0 - 10 | W 10 - 20 | W 10 - 20 | W 15 - 25 |
| Monday Afternoon | W 0 - 10 | SW 0 - 10 | W 5 - 15 | W 0 - 10 | W 10 - 20 |
| Hurricane Ridge | Elevation |
|---|---|
| Sunday Evening | ENE 0 - 10 |
| Sunday Night | W 0 - 10 |
| Monday Morning | SW 0 - 10 |
| Monday Afternoon | W 0 - 10 |
| Mt. Baker | Elevation |
|---|---|
| Sunday Evening | NE 5 - 15 |
| Sunday Night | NW 0 - 10 |
| Monday Morning | W 0 - 10 |
| Monday Afternoon | SW 0 - 10 |
| Stevens and Snoqualmie Pass | Elevation |
|---|---|
| Sunday Evening | E 10 - 20 |
| Sunday Night | W 10 - 20 |
| Monday Morning | W 10 - 20 |
| Monday Afternoon | W 5 - 15 |
| Mt. Rainier | Elevation |
|---|---|
| Sunday Evening | SE 5 - 15 |
| Sunday Night | W 10 - 20 |
| Monday Morning | W 10 - 20 |
| Monday Afternoon | W 0 - 10 |
| Mt. Hood | Elevation |
|---|---|
| Sunday Evening | SW 10 - 20 |
| Sunday Night | W 15 - 25 |
| Monday Morning | W 15 - 25 |
| Monday Afternoon | W 10 - 20 |
| Hurricane Ridge | Direction - Speed |
|---|---|
| Sunday Evening | ENE 0 - 10 |
| Sunday Night | W 0 - 10 |
| Monday Morning | SW 0 - 10 |
| Monday Afternoon | W 0 - 10 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Evening | NE 5 - 15 |
| Sunday Night | NW 0 - 10 |
| Monday Morning | W 0 - 10 |
| Monday Afternoon | SW 0 - 10 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Evening | E 10 - 20 |
| Sunday Night | W 10 - 20 |
| Monday Morning | W 10 - 20 |
| Monday Afternoon | W 5 - 15 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Evening | SE 5 - 15 |
| Sunday Night | W 10 - 20 |
| Monday Morning | W 10 - 20 |
| Monday Afternoon | W 0 - 10 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Evening | SW 10 - 20 |
| Sunday Night | W 15 - 25 |
| Monday Morning | W 15 - 25 |
| Monday Afternoon | W 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 | |
|---|---|---|---|---|---|
| Sunday Evening | S 5 - 15 | S 10 - 20 | S 15 - 25 | S 10 - 20 | SW 15 - 25 |
| Sunday Night | SW 10 - 20 | SW 10 - 20 | W 10 - 20 | W 10 - 20 | W 25 - 35 |
| Monday Morning | NW 5 - 15 | NW 5 - 15 | NW 15 - 25 | NW 15 - 25 | W 20 - 30 |
| Monday Afternoon | W 5 - 15 | W 5 - 15 | W 10 - 20 | NW 5 - 15 | W 10 - 20 |
| Mt. Baker | Direction - Speed |
|---|---|
| Sunday Evening | S 5 - 15 |
| Sunday Night | SW 10 - 20 |
| Monday Morning | NW 5 - 15 |
| Monday Afternoon | W 5 - 15 |
| Washington Pass | Direction - Speed |
|---|---|
| Sunday Evening | S 10 - 20 |
| Sunday Night | SW 10 - 20 |
| Monday Morning | NW 5 - 15 |
| Monday Afternoon | W 5 - 15 |
| Stevens and Snoqualmie Pass | Direction - Speed |
|---|---|
| Sunday Evening | S 15 - 25 |
| Sunday Night | W 10 - 20 |
| Monday Morning | NW 15 - 25 |
| Monday Afternoon | W 10 - 20 |
| Mt. Rainier | Direction - Speed |
|---|---|
| Sunday Evening | S 10 - 20 |
| Sunday Night | W 10 - 20 |
| Monday Morning | NW 15 - 25 |
| Monday Afternoon | NW 5 - 15 |
| Mt. Hood | Direction - Speed |
|---|---|
| Sunday Evening | SW 15 - 25 |
| Sunday Night | W 25 - 35 |
| Monday Morning | W 20 - 30 |
| Monday Afternoon | W 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.
Issued: 1:10 PM PST Sunday, December 22, 2019
Extended Weather Synopsis for Monday night through Monday
The front will split and weaken as it moves inland as the associated upper level trough digs south off the California coast. Forecast models disagree to whether any precipitation will make its way inland Tuesday night and Wednesday morning as the front dissipates. For those looking for fresh snow in the forecast, at best we could have scattered light snow showers over this period.
Strong upper level ridging will build over the Pacific Northwest Wednesday afternoon and Thursday. The upper level pattern combined with strong surface high pressure over the interior of British Columbia and offshore flow will keep us cold and dry.
Extended Snow/Freezing Levels
| Mt. Baker | Snoqualmie Pass | Mt. Hood | Easterly Flow * | ||
|---|---|---|---|---|---|
| Tuesday Night | Snow Level | 0' - 1000' | 0' - 1000' | 1000' - 2000' | * |
| Wednesday | Snow Level | 500' - 1500' | 500' - 1500' | 1000' - 2000' | |
| Wednesday Night | Freezing Level | 0' - 1000' | 0' - 1000' | 0' - 1000' | * |
| Thursday | Freezing Level | 500' - 1500' | 500' - 1500' | 500' - 1500' | * |
| Mt. Baker | Elevation |
|---|---|
| Tuesday Night |
Snow Level 0' - 1000' (Easterly Flow *) |
| Wednesday |
Snow Level 500' - 1500' |
| Wednesday Night |
Freezing Level 0' - 1000' (Easterly Flow *) |
| Thursday |
Freezing Level 500' - 1500' (Easterly Flow *) |
| Snoqualmie Pass | Elevation |
|---|---|
| Tuesday Night |
Snow Level 0' - 1000' (Easterly Flow *) |
| Wednesday |
Snow Level 500' - 1500' |
| Wednesday Night |
Freezing Level 0' - 1000' (Easterly Flow *) |
| Thursday |
Freezing Level 500' - 1500' (Easterly Flow *) |
| Mt. Hood | Elevation |
|---|---|
| Tuesday Night |
Snow Level 1000' - 2000' (Easterly Flow *) |
| Wednesday |
Snow Level 1000' - 2000' |
| Wednesday Night |
Freezing Level 0' - 1000' (Easterly Flow *) |
| Thursday |
Freezing Level 500' - 1500' (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.
Jump to: Weather Forecast I Snow/Freezing Level I Precipitation I Free Winds 5k I Free Winds 9k I Extended Weather
Previous forecast from Dec 22, 2019
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