We'll see a smattering of showers today with a weak frontal system currently hung up over the Olympic peninsula slides inland today. Light showers are most likely for areas near and west of the Cascade crest today. The frontal system combined with a marginally unstable air mass will help keep the threat of showers through Monday evening. Snow levels will remain mild through the entire day, but during heavier showers, expect snow levels to fall 1000-1500' versus the average snow level forecast over the afternoon period.
A ridge of high pressure will move closer to the coast Monday night and shift inland on Tuesday providing us with a window of dry weather. Low-level Pacific moisture and clouds banked up near the Olympics and central/north Washington Cascades near and west of the Cascade crest will help keep mid-mountain temperatures cooler and skies relatively cloudier than areas further east or south on Tuesday. Look for increasing high clouds Tuesday afternoon ahead of an approaching Pacific frontal system.
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
Cloudy with light rain and snow showers.
Monday
Night
Mostly cloudy with scattered light rain and snow showers in the evening, then partly to mostly cloudy.
Monday
Cloudy with light rain and snow showers.
Monday
Night
Mostly cloudy with scattered light rain and snow showers in the evening, then partly to mostly cloudy.
Monday
Cloudy with scattered light rain and snow showers.
Monday
Night
Mostly cloudy with scattered light rain and snow showers in the evening, then partly to mostly cloudy.
Monday
Cloudy with scattered light rain and snow showers.
Monday
Night
Mostly cloudy with scattered light rain and snow showers in the evening, then partly to mostly cloudy.
Monday
Cloudy with scattered light rain and snow showers. Light west winds at Pass level.
Monday
Night
Mostly cloudy with scattered light rain and snow showers in the evening, then partly to mostly cloudy. Light west winds at Pass level.
Monday
Cloudy with scattered light rain and snow showers. Light west winds at Pass level.
Monday
Night
Mostly cloudy with scattered light rain and snow showers in the evening, then partly to mostly cloudy. Light west winds at Pass level.
Monday
Cloudy. Chance of light rain and snow showers near the Cascade crest in the afternoon.
Monday
Night
Mostly cloudy in the evening, then partly to mostly clear after midnight.
Monday
Cloudy. Chance of light rain and snow showers near the Cascade crest in the afternoon.
Monday
Night
Mostly cloudy in the evening, then partly to mostly clear after midnight.
Monday
Cloudy in the morning, then scattered light rain and snow showers mainly near the Cascade crest in the afternoon.
Monday
Night
Mostly cloudy in the evening, then partly to mostly clear after midnight.
Monday
Cloudy with scattered light rain and snow showers.
Monday
Night
Mostly cloudy with scattered light rain and snow showers in the evening, then partly to mostly cloudy.
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).