We're in for a quiet and mild day of weather across the Pacific Northwest. An upper level low off the California coast will spin up high and mid clouds, thickest over the Mt Hood area, leading to stretches of filtered sunshine. Most mountain locations are already in the 40s this morning with freezing levels around 10,000'. We'll see afternoon 5000' temperatures reach the mid to upper 50s. Winds will be moderate out of the SE today for most areas, locally strong this morning for Mt Hood and the West South (Crystal/White Pass/Chinook) thanks to the upper low and a bit of offshore flow. E-SE winds will be with us through at least Monday morning.
Sunday night will be mild with little change in the large scale weather pattern with mild temperatures and occasional high clouds. On Monday, we'll heat up a bit more, with 5000' high temperatures reaching near or into the low to mid 60s. The offshore upper low will creep closer to the Oregon coast, and we'll see a switch to onshore flow, bringing a switch to westerly winds for the west slopes of the Cascades, Olympics and Mt Hood in the late afternoon and evening hours. Showers will creep into the forecast starting on Tuesday.
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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Sunday
Partly sunny with scattered high clouds. Light to occasionally moderate ridgeline winds.
Sunday
Night
Partly cloudy with scattered high clouds. Light to occasionally moderate ridgeline winds.
Sunday
Partly sunny with scattered high clouds. Light to occasionally moderate ridgeline winds.
Sunday
Night
Partly cloudy with scattered high clouds. Light to occasionally moderate ridgeline winds.
Sunday
Partly sunny with scattered high clouds. Light to occasionally moderate ridgeline winds.
Sunday
Night
Partly cloudy with scattered high clouds. Light to occasionally moderate ridgeline winds.
Sunday
Partly sunny with scattered high clouds. Moderate ridgeline winds, occasionally strong in the morning.
Sunday
Night
Mostly cloudy with broken high clouds. Moderate to locally strong ridgeline winds.
Sunday
Partly sunny with scattered high clouds. Light to moderate E winds at Pass level, strongest in the morning. Moderate SE ridgeline winds.
Sunday
Night
Partly cloudy with scattered high clouds. Light to moderate ESE winds at Pass level and ridgeline.
Sunday
Partly sunny with scattered high clouds. Moderate E winds at Pass level, strongest in the morning. Moderate SE ridgeline winds.
Sunday
Night
Partly cloudy with scattered high clouds. Moderate ESE winds at Pass level and ridgeline.
Sunday
Partly sunny with scattered high clouds. Light to occasionally moderate ridgeline winds.
Sunday
Night
Partly cloudy with scattered high clouds. Light to occasionally moderate ridgeline winds.
Sunday
Partly sunny with scattered high clouds. Light to moderate ridgeline winds.
Sunday
Night
Partly cloudy with scattered high clouds. Light to moderate ridgeline winds.
Sunday
Partly sunny with scattered high clouds. Light to moderate ridgeline winds.
Sunday
Night
Partly cloudy with scattered high clouds. Light to moderate ridgeline winds.
Sunday
Mostly cloudy with high clouds this morning, then partly sunny in the afternoon. Moderate ridgeline winds, occasionally strong in the morning.
Sunday
Night
Mostly cloudy with broken high clouds. 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).