Weak and moisture-deprived disturbances continue to slide down the back side of an offshore ridge of high pressure.
A very weak front brought a trace of snow to Mt. Baker early Monday morning, but radar echoes show precipitation has fizzled as the front moves southeast. However, expect more clouds to start the day with partial clearing along the west slopes of the Cascades and mostly sunny skies arriving to the east. Light to moderate NW winds continue throughout the day with little change throughout the short-term forecast. 5000 ft temperatures should rise from the low 20s in the early morning hours to the upper 20s in northern areas and the 30s south of I-90.
The offshore ridge rebounds somewhat Monday night, but a new disturbance sliding down the Canadian Rockies increases clouds across the area after midnight. Light snow could develop for Mt. Baker and the Mountain Loop in the early morning hours.
Very light snow may spread as far south as Mt. Rainier as the disturbance moves into the Dakotas on Tuesday. It lacks significant moisture, so expect only a dusting to an inch of snow for the west slopes of the Washington Cascades. The east slopes can expect partly cloudy skies with downslope winds maintaining milder temperatures.
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
Partly cloudy.
Monday
Night
Becoming mostly cloudy.
Monday
A few snow flurries early in the day then becoming partly to mostly cloudy.
Monday
Night
Mostly cloudy with a chance of light snow in the early morning hours.
Monday
Partly to mostly cloudy.
Monday
Night
Mostly cloudy with a chance of light snow in the early morning hours.
Monday
Partly to mostly cloudy.
Monday
Night
Partly to mostly cloudy.
Monday
Partly to mostly cloudy. Light ridgeline and W wind and the Pass.
Monday
Night
Partly to mostly cloudy. Light ridgeline and W wind and the Pass.
Monday
Partly to mostly cloudy. Light to moderate ridgeline and W wind and the Pass.
Monday
Night
Partly to mostly cloudy. Light to moderate ridgeline and W wind and the Pass.
Monday
Partly cloudy with clouds decreasing in the afternoon.
Monday
Night
Partly cloudy.
Monday
Partly cloudy with clouds decreasing in the afternoon.
Monday
Night
Partly cloudy to mostly clear.
Monday
Partly cloudy with clouds decreasing in the afternoon.
Monday
Night
Partly cloudy to mostly clear.
Monday
Partly cloudy, then becoming mostly sunny in the afternoon.
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).