Last night’s high clouds and moisture have mostly shifted southeast of the Cascades this morning, except for Mount Hood and the East South zone, where some cloud cover remains. Low clouds have settled over the northwest Cascades and areas east of the Crest. Sunday night’s precipitation largely stayed west of the Crest, bringing most zones 2–3 inches of fresh snow. Strong overnight winds have eased significantly over the past few hours.
High pressure built over the region overnight and will persist through Tuesday. Monday will be a sunny, calm spring day across the Pacific Northwest, with high clouds increasing later in the afternoon. Today's NW flow aloft will shift WSW in the evening hours. Winds through the mountain passes will shift easterly in the afternoon, with ridgelines later turning light easterly as well.
Despite the dry conditions, cloud cover will thicken Monday night into Tuesday, limiting overnight cooling. The cloud cover, combined with slightly warmer air moving in, will make Tuesday morning a few degrees warmer than Monday.
Dry weather and cloudy skies will continue on Tuesday as a stronger storm system approaches from the northwest.
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
Calm. Clear in the morning, with building high clouds in the afternoon.
Monday
Night
Calm. Mostly cloudy.
Monday
Filtered sunshine, with building high clouds in the afternoon.
Monday
Night
Calm. Partly cloudy, turning mostly cloudy.
Monday
Filtered sunshine, with building high clouds in the afternoon. Slight chance of snow flurries in the early morning.
Monday
Night
Calm. Partly cloudy, turning mostly cloudy.
Monday
Low clouds near the crest. Clear above. High clouds building in the afternoon. Light to moderate ridgeline wind.
Monday
Night
Partly cloudy, turning mostly cloudy.
Monday
Low clouds, near and east of the crest. Clear skies above. High clouds building in the afternoon. Light ridgeline and west wind at the Pass.
Monday
Night
Partly cloudy, turning mostly cloudy. Light to moderate ridgeline and east wind at the Pass.
Monday
Low clouds, near and east of the crest. Clear skies above. High clouds building in the afternoon. Light to moderate ridgeline and west wind at the Pass.
Monday
Night
Partly cloudy, turning mostly cloudy. Light to moderate ridgeline and east wind at the Pass.
Monday
Low clouds near the crest. High clouds building in the afternoon.
Monday
Night
Partly cloudy, turning mostly cloudy.
Monday
Low clouds near the crest. High clouds building in the afternoon. Light to moderate ridgeline wind.
Monday
Night
Partly cloudy, turning mostly cloudy.
Monday
Low clouds near the crest. High clouds building in the afternoon. Light to moderate ridgeline wind.
Monday
Night
Partly cloudy, turning mostly cloudy.
Monday
Filtered sunshine, with building high clouds in the afternoon. Light to moderate ridgeline wind.
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).