Our last storm is finally exiting the region this morning. Showers continue to linger mainly along the west slopes of the Cascades and Olympics. These should draw to a close as a transient high pressure ridge quickly traverses the region. Expect showers to hang on the longest near the Canadian border.
After a rather cloudy start to the day, most location should start to see some sun breaks. Areas east of the crest and further south will have the best chance at significant sunshine. It won't last long though. High clouds should start to push in from the SW this afternoon. It could be a race between clearing low clouds and incoming high clouds for how much sunshine any specific location actually sees.
The next storm starts to arrive overnight with precipitation pushing into the southern Olympics, Mount Saint Helens, and Hood areas in the evening. Snow will spread from S to North mainly impacting locations near and south of I-90. Showers should just start to reach the central and northern Cascades in the very early morning hours. With S-SE flow, this system will bring another shot of snow to the east side forecast zone. Most of the precipitation occurs before lunchtime on Monday, shifting to a more showery pattern in the afternoon.
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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Sunday
Snow showers mainly in the early morning, then clearing. High thin clouds in the afternoon.
Sunday
Night
Clouds increasing with snow starting in the evening for the southern Olympics and overnight near Hurricane Ridge. S winds becoming moderate but gusty.
Sunday
Snow showers, heaviest in the morning. A few sun breaks possible in the afternoon. Light to moderate SW winds decreasing.
Sunday
Night
Clearing with low clouds and fog in the evening. Then increasing clouds and a few isolated showers in the early morning hours. SSE winds becoming light to moderate.
Sunday
Snow showers mainly in the morning. Sun breaks possible in the afternoon with isolated showers. Light to moderate SW winds decreasing.
Sunday
Night
Dry in the evening with some low clouds and valley fog. Clouds increasing overnight with a few showers in the early morning hours. Winds turning SE and becoming moderate.
Sunday
Cloudy to mostly cloudy with snow showers. Low clouds with sun breaks in the afternoon. High clouds increasing late in the day. Light to moderate WSW winds decreasing.
Sunday
Night
Clouds increasing in the evening with showers arriving near Mount Saint Helens and spreading NE overnight. SE winds becoming moderate.
Sunday
Cloudy with snow showers mainly in the morning. Sun breaks with lingering low clouds in the afternoon. Westerly flow at pass level.
Sunday
Night
Increasing clouds in the evening, with a few showers arriving in the early morning hours. SE ridgeline winds becoming light to moderate with light to moderate east flow at pass level.
Sunday
Cloudy with snow showers mainly in the morning. A few sun breaks in the afternoon with increasing high clouds. Light to moderate W ridgeline winds decreasing. Light westerly flow at pass level.
Sunday
Night
Cloudy with snow returning around midnight. ESE ridgeline winds becoming moderate but gusty. Light to moderate E flow at pass level.
Sunday
Partly to mostly cloudy in the morning with a few isolated showers. Clearing. Light to moderate W winds decreasing.
Sunday
Night
Clouds increasing in the evening and overnight. A few showers mainly in the southern and eastern parts of the zone. Winds becoming SSE light to moderate.
Sunday
Partly cloudy to mostly clear with a few showers near the crest in the morning. Mostly sunny with increasing high clouds in the afternoon. Moderate W winds decreasing.
Sunday
Night
Cloudy with snow arriving around midnight. Winds becoming SSE moderate and gusty.
Sunday
Partly cloudy to mostly sunny with a few isolated showers possible near the crest in the morning. Becoming mostly sunny with high clouds increasing in the afternoon.
Sunday
Night
Cloudy with snow arriving overnight. Winds becoming SSW moderate and gusty.
Sunday
Cloudy with snow showers mainly in the morning. Some sun breaks possible in the afternoon. Moderate to strong W winds decreasing.
Sunday
Night
Cloudy with snow returning in the evening. S winds becoming SW moderate to strong and gusty.
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).