Overnight, a frontal system delivered heavy precipitation and extreme winds to the Mt Hood area with significant but lighter precipitation further north. This frontal boundary is now slowly slipping south into central Oregon this morning. The Mt Hood area will see a few more hours of moderate precipitation along with a slow cooling trend this morning, and winds will back off as well. Further north, showers have filled in on radar and we'll see light to moderate showers over the Cascades and Olympics this morning with snow levels around 2000'. Showers should become more scattered in the afternoon along with skies becoming broken with a few sunbreaks. Sunbreaks should be more plentiful along the east slopes of the Cascades this afternoon, especially north of I-90, and freezing levels will bump up a bit more on the east side vs the west.
A weak Puget Sound convergence should form tonight as westerly winds pick up, with the convergence zone focusing near and north of Highway 2. This should add a few inches to affected areas but won't be a big snowmaker or long lived event. We'll cool off tonight and freezing levels will drop to 1500' or lower by Monday morning. An upper trough will move over the area on Monday, leading to plenty of afternoon cloud cover and convective showers in a marginally unstable air mass. Showers will likely increase along the west slopes of the Cascades and Mt Hood Monday night.
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
Sunday
Light to moderate rain and snow showers this morning, becoming mostly cloudy with scattered showers this afternoon. Light to occasionally moderate ridgeline winds.
Sunday
Night
Mostly cloudy with scattered light snow showers. Light to moderate ridgeline winds.
Sunday
Light to moderate rain and snow showers this morning, becoming mostly cloudy with scattered showers this afternoon. Light to occasionally moderate ridgeline winds.
Sunday
Night
Mostly cloudy with scattered light snow showers. Light to moderate ridgeline winds.
Sunday
Light to moderate rain and snow showers this morning, becoming mostly cloudy with scattered showers this afternoon. Light to occasionally moderate ridgeline winds.
Sunday
Night
Cloudy with light snow showers. Light to moderate ridgeline winds.
Sunday
Light to moderate rain and snow showers this morning, becoming mostly cloudy with scattered showers this afternoon. Light to moderate ridgeline winds.
Sunday
Night
Mostly cloudy with scattered light snow showers. Light to moderate ridgeline winds.
Sunday
Light to moderate rain and snow showers this morning, becoming mostly cloudy with scattered showers this afternoon. Light to occasionally moderate W ridgeline and Pass level winds.
Sunday
Night
Cloudy with light snow showers. Moderate W ridgeline and Pass level winds.
Sunday
Light to moderate rain and snow showers this morning, becoming mostly cloudy with scattered showers this afternoon. Light to moderate W ridgeline and Pass level winds.
Sunday
Night
Mostly cloudy with scattered light snow showers. Moderate W ridgeline and Pass level winds.
Sunday
Light to occasionally moderate rain and snow showers this morning, heaviest near the Cascade crest, becoming partly sunny to mostly cloudy with scattered showers this afternoon. Light to moderate ridgeline winds.
Sunday
Night
Mostly cloudy with scattered light snow showers. Light to moderate ridgeline winds.
Sunday
Light to occasionally moderate rain and snow showers this morning, heaviest near the Cascade crest, becoming partly sunny to mostly cloudy with scattered showers this afternoon. Light to moderate ridgeline winds.
Sunday
Night
Mostly cloudy with scattered light snow showers. Moderate ridgeline winds.
Sunday
Light to occasionally moderate rain and snow showers this morning, heaviest near the Cascade crest, becoming mostly cloudy with scattered showers this afternoon. Light to moderate ridgeline winds.
Sunday
Night
Mostly cloudy with scattered light snow showers. Light to moderate ridgeline winds.
Sunday
Moderate rain and snow this morning, becoming mostly cloudy with scattered light showers this afternoon. Moderate to strong ridgeline winds this morning, easing by mid-day.
Sunday
Night
Mostly cloudy with scattered light rain and snow showers. Moderate ridgeline winds.
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).