We're in the middle of a persistent pattern with little change through at least midweek. High pressure will dominate over the region, and you'll find beautiful clear skies and mild temperatures at middle and upper elevations with winds in the light to moderate range. Low clouds and much colder temperatures will stay entrenched in deep valleys and on the east side of the Cascades in general. Strong temperature inversions can be found at many locations this morning, for example Washington Pass was a chilly 14F at Pass level (5450') and 40F with low relative humidity up at 6700'.
Persistent easterly flow will drag clouds through Snoqualmie Pass and near Stevens and White Passes over this stretch, although the higher Passes are more likely to see clear skies than Snoqualmie. Freezing levels will be in the 9000-11,000' range over this stretch and mid-mountain high temperatures will be in the 40s with even a few 50s possible today and Tuesday afternoon. A weak weather system will pass through on Thursday.
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 sunny. Areas of valley fog.
Monday
Night
Mostly clear. Areas of valley fog.
Monday
Mostly sunny. Areas of valley fog. Light to moderate ridgeline winds.
Monday
Night
Mostly clear. Areas of valley fog. Light to moderate ridgeline winds.
Monday
Mostly sunny. Areas of valley fog.
Monday
Night
Mostly clear. Areas of valley fog.
Monday
Mostly sunny. Areas of valley fog, especially near and east of White Pass. Light to moderate ridgeline winds.
Monday
Night
Mostly clear. Areas of valley fog, especially near and east of White Pass. Light to moderate ridgeline winds.
Monday
Mostly sunny mid and upper slopes. Cloudy, colder, with low clouds and fog near and East of the Pass. Light to moderate E winds at Pass level and S-WSW ridgeline winds.
Monday
Night
Mostly clear mid and upper slopes. Cloudy, colder, with low clouds and fog near and East of the Pass. Light to moderate E winds at Pass level and S-WSW ridgeline winds.
Monday
Mostly sunny mid and upper slopes. Cloudy, colder, with low clouds and fog near the Pass. Light to moderate E winds at Pass level and S-WSW ridgeline winds.
Monday
Night
Mostly clear mid and upper slopes. Cloudy, colder, with low clouds and fog near the Pass. Light to moderate E winds at Pass level and S-WSW ridgeline winds.
Monday
Mostly sunny mid and upper slopes. Cloudy, colder, with low clouds and fog lower slopes and valleys. Light to moderate ridgeline winds.
Monday
Night
Mostly clear mid and upper slopes. Cloudy, colder, with low clouds and fog lower slopes and valleys. Light to moderate ridgeline winds.
Monday
Mostly sunny mid and upper slopes. Cloudy, colder, with low clouds and fog lower slopes and valleys. Light to moderate ridgeline winds.
Monday
Night
Mostly clear mid and upper slopes. Cloudy, colder, with low clouds and fog lower slopes and valleys. Light to moderate ridgeline winds.
Monday
Mostly sunny mid and upper slopes. Cloudy, colder, with low clouds and fog lower slopes and valleys. Light to moderate ridgeline winds.
Monday
Night
Mostly clear mid and upper slopes. Cloudy, colder, with low clouds and fog lower slopes and valleys. Light to 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).