A front passed through the Cascades in the early morning hours, producing about 6-15 inches of snow along the west slopes of the Cascades and Mt Hood with lighter amounts along the east slopes and Olymipcs. Showers will continue in earnest this morning with additional accumulations especially for the Mt Hood area and near a convergence zone currently along Hwy 2. The convergence zone should shift south later this morning towards the I-90 corridor and eventually down into the Crystal and Mt Rainier area by mid-day. A cool upper trough passing east of the Cascades will keep conditions cool, showery and cloudy elsewhere. Strong post-front west winds will slowly ease this afternoon and start to turn more northwesterly.
We should dry out heading into tomorrow morning as strong upper level ridging builds offshore. However, the ridge will quickly buckle on Tuesday, allowing high clouds to stream over much of Washington state and trapping low clouds from about Snoqualmie Pass and northward along the west slopes of the Cascades. Clearer conditions are likely south of I-90 to Mt. Hood on Tuesday.
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
Partly to mostly cloudy with scattered light rain and snow showers.
Monday
Night
Partly to mostly cloudy.
Monday
Cloudy with light rain and snow showers in the morning, becoming mostly cloudy with scattered light rain and snow showers in the afternoon.
Monday
Night
Mostly cloudy.
Monday
Cloudy with light to occasionally moderate rain and snow showers in the morning. Light scattered showers in the afternoon.
Monday
Night
Partly to mostly cloudy.
Monday
Mostly cloudy with scattered light rain and snow showers in the morning, becoming cloudy with light to occasionally moderate showers in the afternoon. Strong ridgeline winds decreasing in the afternoon.
Monday
Night
Mostly cloudy with scattered light showers in the evening ending after midnight.
Monday
Cloudy with light to occasionally moderate rain and snow showers in the morning. Light scattered showers in the afternoon. Moderate to strong ridgeline and Pass level west winds decreasing in the afternoon.
Monday
Night
Partly to mostly cloudy.
Monday
Cloudy with light to occasionally moderate rain and snow showers in the morning. Light scattered showers in the afternoon. Strong ridgeline and Pass level west winds decreasing in the afternoon.
Monday
Night
Partly to mostly cloudy. Chance of light showers in the evening.
Monday
Cloudy with scattered light rain and snow showers in the morning, becoming mostly cloudy with isolated showers in the afternoon.
Monday
Night
Partly cloudy.
Monday
Cloudy with light rain and snow showers in the morning, occasionally moderate near the Cascade crest. Mostly to partly cloudy with isolated light showers in the afternoon. Strong ridgeline winds.
Monday
Night
Partly to mostly clear.
Monday
Cloudy with light rain and snow showers in the morning, occasionally moderate near the Cascade crest. Mostly to partly cloudy with isolated light showers in the afternoon. Strong ridgeline winds.
Monday
Night
Partly to mostly clear.
Monday
Cloudy with light to moderate rain and snow showers in the morning, becoming mostly cloudy with scattered light showers in the afternoon. More sunbreaks east side of the mountain. Strong ridgeline winds.
Monday
Night
Mostly cloudy with scattered light showers in the evening ending 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).