High clouds from a weak weather disturbance are almost finished traversing the Cascades this morning from west to east. Soon the entire region will be under mostly sunny skies. Overnight mid-mountain lows were near or even above freezing over in the Olympics and the west slopes of the Cascades, while temperatures were generally in the 20s near the Passes and along the east slopes of the Cascades. We'll see persistent SE winds play touch and go with moderate today and tonight and in many areas.
Increasing high clouds from an approaching upper level trough will move over the Olympics later this afternoon and further east over the Cascades this evening. A high overcast will help lock in mild overnight lows on Saturday night.
On Sunday, the upper level trough will lift NE and rotate showers up through western Oregon in the morning. Clouds over our mountains will slowly thicken and lower during the day. Showers will move into the Mt Hood area mid-day through the afternoon. Scattered light showers will likely reach the south Washington Cascades and perhaps as far north as I-90 Sunday afternoon. SE ridgeline winds will increase to moderate to perhaps even strong for the Mt Hood area, the south Washington Cascades and the Snoqualmie Pass area as well on Sunday.
Weather Forecast
Olympics
West North
West Central
West South
Stevens Pass
Snoqualmie Pass
East North
East Central
East South
Mt. Hood
Use dropdown to select your zone
Saturday
Sunny in the morning, then mostly to partly sunny in the afternoon with high clouds and filtered sunshine.
Saturday
Night
Cloudy.
Saturday
Partly cloudy early in the morning, then mostly sunny. Increasing high clouds in the late afternoon.
Saturday
Night
Cloudy.
Saturday
Partly cloudy early in the morning, then mostly sunny. Increasing high clouds in the late afternoon.
Saturday
Night
Cloudy.
Saturday
Partly cloudy early in the morning, then mostly sunny. Increasing high clouds in the late afternoon. Periods of moderate ridgeline winds.
Saturday
Night
Cloudy. Periods of moderate ridgeline winds.
Saturday
Partly cloudy early in the morning, then mostly sunny. Increasing high clouds in the late afternoon. Light to moderate E-SE ridgeline and Pass level winds.
Saturday
Night
Cloudy. Light to moderate E-SE ridgeline and Pass level winds.
Saturday
Partly cloudy early in the morning, then mostly sunny. Increasing high clouds in the late afternoon. Light to moderate E-SE ridgeline and Pass level winds.
Saturday
Night
Cloudy. Light to moderate E-SE ridgeline and Pass level winds.
Saturday
Partly to mostly cloudy in the morning, then mostly sunny.
Saturday
Night
Cloudy.
Saturday
Partly to mostly cloudy in the morning, then mostly sunny. A few high clouds late afternoon. Periods of moderate ridgeline winds.
Saturday
Night
Cloudy. Periods of moderate ridgeline winds.
Saturday
Partly to mostly cloudy in the morning, then mostly sunny. Increasing high clouds in the late afternoon.
Saturday
Night
Cloudy.
Saturday
Sunny in the morning, then mostly to partly sunny in the afternoon with high clouds and filtered sunshine.
Saturday
Night
Cloudy.Periods of moderate ridgeline winds after midnight.
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).