Most weather stations show temperatures 10 to 20 degrees colder this morning than they did 24hrs ago. Brrrr! A few lingering flurries continue to fall in the Olympics and West Slopes of the Cascades. For most mountain locations, you will start the day partly to mostly cloudy with light to moderate winds. Isolated and short-lived showers could bring a few snowflakes to areas south of I90 as a developing upper-level low drifts down to Oregon. As the day progresses, skies should continue to clear and result in mostly sunny weather around the Pacific Northwest. A few low-level clouds may remain in the mountain passes and west-side valleys during the day until we fully dry out overnight.
A high-pressure ridge over the eastern Pacific will dominate our weather for the next several days. Skies should continue clearing overnight. This will result in a chilly evening with fog possible in the mountain valleys and passes. On Tuesday, temperatures will quickly rise as set up for a nice warm sunny day.
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. Isolated flurries in the morning.
Monday
Night
Clear and cold. Valley fog possible.
Monday
Partly cloudy in the morning becoming mostly sunny.
Monday
Night
Mostly clear. Valley fog possible.
Monday
Low clouds in the morning with flurries possible. Becoming mostly sunny.
Monday
Night
Mostly clear with valley fog possible.
Monday
Mostly cloudy in the morning with isolated snow showers. Moderate NW winds decreasing. Clearing in the afternoon.
Monday
Night
Mostly clear with fog possible in the valleys and passes.
Monday
Mostly cloudy in the morning. Clearing in the afternoon, especially east of the pass. Light to moderate W winds.
Monday
Night
Continued clearing and cold. Fog possible at the pass. Light and variable winds.
Monday
Mostly cloudy in the morning with isolated flurries possible. Clearing in the afternoon especially east of the pass. Light to moderate W winds
Monday
Night
Continued clearing and cold. Fog possible at the pass. Light NW winds.
Monday
Partly cloudy in the morning becoming mostly sunny.
Monday
Night
Clear with valley fog possible.
Monday
Partly cloudy becoming mostly sunny.
Monday
Night
Clear with fog possible in the mountain valleys and passes.
Monday
Partly cloudy in the morning with isolated flurries. Clearing in the afternoon.
Monday
Night
Clear with valley fog possible
Monday
Mostly cloudy morning with isolated snow showers. Moderate WNW winds decreasing. Becoming partly sunny in the afternoon.
Monday
Night
Partly cloudy with isolated snow showers in the evening. Clearing with valley fog possible.
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).