Light rain will brush the area today as a weakening frontal system dies over the area. You're more likely to see some cloud breaks along the east slopes of the Cascades and the eastern side of Mt Hood today. Temperatures will be mild and snow levels will be in the 6500-7500' range with steady W-SW winds.
Yet another atmospheric river is headed our way starting Sunday night and into next week. Precipitation will really pick up during the day on Monday, especially for the central and north WA Cascades where 1-2 inches of liquid water is expected during the daylight hours. W-SW winds will be strong to extreme, flooding warm air into the region. While we're talking about rain at most locations and elevations that matter, the Washington Pass area and East North zone will be tricky, and snow levels may hang around 6000' until milder air arrives Monday afternoon.
Gradual cooling will start Monday night into Tuesday as additional waves of moisture arrive. Get ready for another stormy week, albeit one that ends a lot cooler than we started.
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 rain. Moderate to strong ridgeline winds.
Sunday
Night
Light rain and snow in the evening, becoming moderate overnight. Strong ridgeline winds.
Sunday
Light rain and high elevation snow. Moderate ridgeline winds.
Sunday
Night
Light rain and snow in the evening, becoming moderate to heavy overnight. Strong ridgeline winds.
Sunday
Light rain and high elevation snow tapering off in the afternoon. Moderate ridgeline winds.
Sunday
Night
Light rain and snow in the evening, becoming moderate to heavy overnight. Strong ridgeline winds.
Sunday
Periods of light rain today and high elevation snow, mainly through mid-day. Moderate to strong ridgeline winds.
Sunday
Night
Cloudy in the evening, then light to moderate rain and high elevation snow developing before daybreak. Strong ridgeline winds.
Sunday
Periods of light rain today and high elevation snow, mainly through mid-day. Light to moderate W ridgeline and Pass level winds.
Sunday
Night
Cloudy in the evening, then light to moderate rain and high elevation snow developing after midnight. Light to moderate E winds at Pass level, Strong SW winds at ridgeline.
Sunday
Periods of light rain today and high elevation snow, mainly through mid-day. Light to moderate W ridgeline and Pass level winds.
Sunday
Night
Cloudy in the evening, then light to moderate rain and high elevation snow developing after midnight. Light to moderate E winds at Pass level, Strong SW winds at ridgeline.
Sunday
Periods of light rain and snow today. Moderate to strong ridgeline winds.
Sunday
Night
Cloudy in the evening, then light to moderate rain and snow developing around midnight. Strong ridgeline winds.
Sunday
Periods of light rain today and high elevation snow, mainly through mid-day. Moderate to strong ridgeline winds.
Sunday
Night
Cloudy in the evening, then light rain and high elevation snow developing before daybreak. Strong ridgeline winds.
Sunday
Periods of light rain today and high elevation snow, mainly through mid-day. Moderate to strong ridgeline winds.
Sunday
Night
Cloudy in the evening, then light rain and high elevation snow developing before daybreak. Strong ridgeline winds.
Sunday
Mostly cloudy with periods of light rain and high elevation snow, mainly late morning through mid-day. Moderate to strong ridgeline winds.
Sunday
Night
Cloudy in the evening, then light rain and high elevation snow developing before daybreak. Strong 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).