Snowfall continues this morning in most areas west of the Cascade crest and north of I-90. A brief convergence zone has set up over Stevens and Snoqualmie Pass, allowing for some locally heavier precipitation.
Today, a drying trend will begin, providing a short break in precipitation. The bulk of the precipitation is expected to taper off by mid-morning, with clouds gradually lightening—especially east of the crest, where it likely will be a sunny day. Low clouds will start to break up along the west slopes, but will linger through Monday.
This break in precipitation will likely last through most of tonight before a new system arrives during the early morning hours on Tuesday. A strong frontal system will push into Western Washington, bringing significant mountain snowfall, with temperatures remaining well below pass level. There is a chance of a brief warm-up Tuesday afternoon, pushing snow levels close to pass level at Snoqualmie, but precipitation is still expected to fall primarily as snow. Besides snowfall, this system will features very strong westerly winds in all areas starting Monday night and really ramping up on Tuesday. Snowfall will continue through Tuesday night into Wednesday.
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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Monday
Mostly cloudy with a chance of snow this morning, broken skies and clearing in the afternoon.
Monday
Night
Light snowfall, with cooling temperatures overnight.
Monday
Light snowfall, turning mostly cloudy in the afternoon.
Monday
Night
Light to moderate snowfall, with strengthening ridgeline wind.
Monday
Light to moderate rain and mountain snow, turning mostly cloudy in the afternoon.
Monday
Night
Light to moderate snowfall, with strengthening ridgeline wind.
Monday
Light to moderate rain and mountain snow, turning mostly cloudy in the afternoon.
Monday
Night
A chance of snowfall, with building clouds and cooling temperatures.
Monday
Light to moderate rain and mountain snow. Light to moderate ridgeline wind, blowing west at the pass.
Monday
Night
A chance of snow, with temperatures dropping. Moderate ridgeline wind, blowing west at the Pass.
Monday
Light to moderate rain and mountain snow. Light to moderate ridgeline wind, blowing west at the pass.
Monday
Night
A chance of snow, with temperatures dropping. Moderate ridgeline wind, blowing west at the Pass.
Monday
Chance of lingering snowfall in the morning, clearing skies in the afternoon.
Monday
Night
A chance of snowfall, with building clouds and cooling temperatures.
Monday
Chance of lingering snowfall in the morning, clearing skies in the afternoon.
Monday
Night
Building clouds, with cooling temperatures. Moderate to strong ridgeline wind.
Monday
A chance of flurries in the morning, clearing skies in the afternoon.
Monday
Night
Building clouds, with moderate to strong ridgeline wind. Cooling temperatures overnight.
Monday
Light rain and mountain snow. Light to moderate ridgeline wind.
Monday
Night
Building clouds, with moderate to strong ridgeline wind. Cooling temperatures overnight.
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).