After a stormy weekend we're in for a quiet spell of weather over the next few days. A strong upper level ridge of high pressure positioned offshore will slowly drift over our area through midweek. This will result in a drying and warming trend. We'll see low clouds along the west slopes of the Cascades and Olympics clear up for a sunny Monday afternoon. Freezing levels will pop first for the Olympics and Mt Hood area today to near 9000' and methodically work its way east of the Cascades later tonight and Tuesday.
Easterly flow will start back up tonight through the Passes, but low clouds/fog shouldn't be as persistent as it was during our long stretch of dry weather last week The warm air moving in aloft and low level easterly flow will bring about temperature inversions in the Passes and especially along the east slopes of the Cascades below 4500' tonight and Tuesday. We'll see some high clouds filter over the area on on Tuesday.
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
Monday
Partly to mostly cloudy in the morning, then mostly sunny in the afternoon.
Monday
Night
Mostly clear.
Monday
Partly to mostly cloudy in the morning, then mostly sunny in the afternoon.
Monday
Night
Mostly clear.
Monday
Partly to mostly cloudy in the morning, then mostly sunny in the afternoon.
Monday
Night
Mostly clear.
Monday
Partly to mostly cloudy in the morning, then mostly sunny in the afternoon. Light W-WNW winds at Pass level, light to occasionally moderate at ridgeline.
Monday
Night
Mostly clear with areas of low clouds/fog. Light east winds at Pass level, light to occasionally moderate W-WNW at ridgeline.
Monday
Partly to mostly cloudy in the morning, then mostly sunny in the afternoon. Light W-WNW winds at Pass level, light to occasionally moderate at ridgeline.
Monday
Night
Mostly clear with areas of low clouds/fog. Light east winds at Pass level, light to occasionally moderate W-WNW at ridgeline.
Monday
Partly to mostly cloudy in the morning, then mostly sunny in the afternoon.
Monday
Night
Mostly clear with areas of low clouds/fog. Light east winds at Pass level, light to occasionally moderate W-WNW at ridgeline.
Monday
Partly to mostly sunny in the morning, then mostly sunny.
Monday
Night
Mostly clear. Areas of low clouds/fog.
Monday
Partly to mostly sunny in the morning, then mostly sunny.
Monday
Night
Mostly clear. Areas of low clouds/fog.
Monday
Partly to mostly sunny in the morning, then mostly sunny.
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).