A few lingering snow and rain showers come to a close in the mountains and foothills this morning as a short-lived ridge pushes across the forecast area. Expect a nice day with some partial clearing, occasional sun breaks, mild temperatures, and generally light winds. This bit of respite will be quick as the next system pushes into the zone late Tuesday evening. Precipitation begins around 10 pm and builds in intensity overnight. Both sides of the Cascades see the action on Wednesday with widespread moderate to occasionally heavy precipitation throughout the day. Snow levels on the west side hover between 3000 and 4000ft while the passes and the east side are closer to 2500-3000ft. Snoqualmie Pass looks to be right on the edge of the rain/snow line and with cold air at the surface, the Pass itself could see some freezing rain anytime between Tuesday night and early Thursday AM.
Weather Forecast
Olympics
West North
West Central
West South
Stevens Pass
Snoqualmie Pass
East North
East Central
East South
Mt. Hood
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Tuesday
Gradual clearing, partly cloudy skies, and occasional sun breaks. Light to moderate SW winds. Cloud cover increases later in the day.
Tuesday
Night
Light snow and rain showers increase overnight. Moderate south winds increase to strong.
Tuesday
Gradual clearing, partly cloudy skies, and occasional sun breaks. Light to moderate SW winds. Cloud cover increases later in the day.
Tuesday
Night
Light snow and rain showers increase overnight. Moderate south winds.
Tuesday
Gradual clearing, partly cloudy skies, and occasional sun breaks. Light to moderate SW winds. Cloud cover increases later in the day.
Tuesday
Night
Light snow and rain showers increase overnight. Moderate south winds veering to the southeast.
Tuesday
Gradual clearing, partly cloudy skies, and occasional sun breaks. Light to moderate SW winds. Cloud cover increases later in the day.
Tuesday
Night
Light snow and rain showers increase overnight. Moderate south winds. Heavier precipitation on the volcanoes.
Tuesday
Gradual clearing, partly cloudy skies, and occasional sun breaks. Light to moderate southwest ridgeline winds and light to moderate southwest winds veering to the southeast late in the afternoon at pass level. Cloud cover increases later in the day.
Tuesday
Night
Light snow and rain showers increase overnight. Moderate southeast winds at ridgeline and moderate east winds at pass level.
Tuesday
Gradual clearing, partly cloudy skies, and occasional sun breaks. Light to moderate west ridgeline winds and light to moderate southwest winds veering to the southeast and increasing late in the afternoon at pass level. Cloud cover increases later in the day.
Tuesday
Night
Light snow and rain showers increase overnight. Moderate southeast winds at ridgeline and moderate to strong southeast winds at pass level.
Tuesday
Gradual clearing, partly cloudy skies, and occasional sun breaks. Light to moderate SW winds. Cloud cover increases later in the day.
Tuesday
Night
Light snow and rain showers increase overnight. Moderate southeast winds.
Tuesday
Gradual clearing, partly cloudy skies, and occasional sun breaks. Light to moderate SW winds. Cloud cover increases later in the day.
Tuesday
Night
Light snow and rain showers increase overnight. Moderate south winds increase overnight.
Tuesday
Gradual clearing, partly cloudy skies, and occasional sun breaks. Light to moderate SW winds. Cloud cover increases later in the day.
Tuesday
Night
Light snow and rain showers increase overnight. Moderate south winds.
Tuesday
Gradual clearing, partly cloudy skies, and occasional sun breaks. Moderate SW winds. Cloud cover increases later in the day.
Tuesday
Night
Moderate snow and rain showers, heavy at times. Increasing moderate to strong southwest winds.
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.
The 5000’ temperature forecast does not imply a trend over the 12 hr period and only represents the max and min temperatures within a 12 hr period in the zone. The 6-hr snow level forecast, the forecast discussion, and weather forecast sections may add detail regarding temperature trends.
The snow level forecast represents the general snow level over a 6 hr time period. Freezing levels are forecast when precipitation is not expected.
*Easterly or offshore flow is highlighted with an asterisk when we expect relatively cool east winds in the major Cascade Passes. Easterly flow will often lead to temperature inversions and is a key variable for forecasting precipitation type in the Cascade Passes. Strong easterly flow events can affect terrain on a more regional scale.
Ridgeline winds are the average wind speed and direction over a 6 hr time period.
The wind forecast represents an elevation range instead of a single elevation slice. The elevation range overlaps with the near and above treeline elevation bands in the avalanche forecast and differs per zone.
Wind direction indicates the direction the wind originates or comes from on the 16-point compass rose.
Water Equivalent (WE) is the liquid water equivalent of all precipitation types; rain, snow, ice pellets, etc., forecast to the hundredth of an inch at specific locations. To use WE as a proxy for snowfall amounts, start with a snow to water ratio of 10:1 (10 inches of snow = 1 inch WE). Temperatures at or near freezing will generally have a lower ratio (heavy wet snow) and very cold temperatures can have a much higher ratio (dry fluffy snow).