High pressure will continue to dominate our weather over the short term and through much of next week. Over the short term, a strong ridge of high pressure will remain anchored off the Oregon coast. For today, look for sunny skies and high passing high clouds, the thickest near the Canadian border and especially east of the Cascade crest where upper level NW winds are also the strongest. There is extensive low land/valley fog and steep but shallow temperature inversions. Low level clouds near and east of the Cascade Passes will mix out at least near the Passes as the flow becomes more westerly this afternoon. Mid and upper slopes will be quite warm again today, widespread 40s with a few low 50s near Mt Hood, but not quite as warm as Saturday.
Most areas will see moderate NW winds above treeline by the end of the day. If you venture into the alpine, you can expect strong NW winds to affect most areas tonight through much of Monday. A dry upper level disturbance will pass through the area tonight from the NW, keeping those alpine winds strong and spreading high clouds over the region. Freezling levels and temperatures will be slightly cooler on Monday.
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
Mostly sunny with periods of high clouds. Areas of low valley clouds and fog.
Sunday
Night
Mostly cloudy with high clouds. Areas of low valley clouds and fog.
Sunday
Partly to mostly sunny with periods of high clouds.
Sunday
Night
Mostly cloudy with high clouds. Areas of low valley clouds and fog.
Sunday
Partly to mostly sunny with periods of high clouds.
Sunday
Night
Mostly cloudy with high clouds. Areas of low valley clouds and fog.
Sunday
Mostly sunny with periods of high clouds.
Sunday
Night
Mostly cloudy with high clouds. Low valley clouds and fog.
Sunday
Partly to mostly sunny with periods of high clouds. Low valley clouds and fog. Light east winds at Pass level becoming light west in the afternoon. Moderate NW winds at ridgeline.
Sunday
Night
Mostly cloudy with high clouds. Low valley clouds and fog. Light west winds at Pass level. Moderate NW winds at ridgeline.
Sunday
Partly to mostly sunny with periods of high clouds. Low valley clouds and fog. Light east winds at Pass level becoming light west in the afternoon. Moderate NW winds at ridgeline.
Sunday
Night
Mostly cloudy with high clouds. Low valley clouds and fog. Light west winds at Pass level. Moderate NW winds at ridgeline.
Sunday
Partly to mostly cloudy with high clouds, cloudier east of the Cascade crest. Low valley clouds and fog. Strong ridgeline winds.
Sunday
Night
Mostly cloudy with high clouds. Low valley clouds and fog.
Sunday
Partly to mostly sunny with periods of high clouds, cloudier near and north of Hwy 2. Low valley clouds and fog. Strong ridgeline winds.
Sunday
Night
Mostly cloudy with high clouds. Low valley clouds and fog. Strong ridgeline winds.
Sunday
Mostly sunny with periods of high clouds. Low valley clouds and fog.
Sunday
Night
Mostly cloudy with high clouds. Low valley clouds and fog. Strong ridgeline winds.
Sunday
Mostly sunny with a few high clouds.
Sunday
Night
Mostly cloudy with high clouds. Strong 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).