A weak trough remains over the area with winds and lingering light rain/snow decreasing and mostly ending early in the day for places like Mt. Baker, Barlow Pass, and the Olympic Mountains. Clouds will decrease with increasing chances for sun breaks along the west slopes of the Cascades as the day progresses. East of the Cascade Crest, Partly to mostly cloudy skies should give to mostly sunny conditions. Freezing levels should rise to around 3500 ft by the afternoon.
Very light westerly flow splits as it reaches the area on Monday night. Expect increasing clouds with warm air moving in aloft in association with a slightly drippy, weak ridge of high pressure moving into the area with chances of very light rain/snow for the west slopes of the Cascades during the early morning hours.
The drippy pattern with mostly cloudy skies for the west slopes of the Cascades continues on Tuesday with the weak ridge squarely over the area and a warm front moving into the nearshore waters. Expect mostly sunny skies further east. Temperatures remain near seasonal norms.
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 isolated rain/snow showers.
Monday
Night
Partly cloudy in the evening with increasing clouds overnight and a slight chance of rain/snow.
Monday
Light rain/snow decreasing during the morning hours, then remaining mostly cloudy.
Monday
Night
Mostly cloudy with a slight chance of light rain snow after midnight.
Monday
Light rain/snow possible through mid-morning, then remaining mostly cloudy.
Monday
Night
Mostly cloudy with a slight chance of light rain snow after midnight.
Monday
Partly to mostly cloudy skies with a chance of a sprinkle or snow flurry early in the day at Paradise.
Monday
Night
Partly cloudy in the evening with increasing clouds and a slight chance of very light rain/snow overnight.
Monday
Mostly cloudy in the morning, then partly cloudy in the afternoon. Light ridgeline and W wind at the Pass.
Monday
Night
Increasing clouds with a chance of very light rain or snow in the early morning hours. Light ridgeline and W wind at the Pass.
Monday
Mostly cloudy in the morning, then partly cloudy in the afternoon. Light ridgeline and W wind at the Pass.
Monday
Night
Increasing clouds with a chance of very light rain or snow in the early morning hours. Light ridgeline and W wind at the Pass.
Monday
Mostly cloudy with a slight chance of light snow early.
Monday
Night
Partly cloudy to mostly clear skies.
Monday
Mostly cloudy in the morning then becoming partly cloudy to mostly sunny in the afternoon.
Monday
Night
Mostly clear with some clouds lingering closer to the Cascade Crest.
Monday
Partly cloudy.
Monday
Night
Mostly clear.
Monday
Partly cloudy.
Monday
Night
Partly cloudy with more clouds on the western side of Mt. Hood. A slight chance of very light rain/snow in the early morning hours.
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).