A front that passed through the area last night lingers over northern Oregon, bringing decreasing light snowfall along with moderate ridgeline winds to the Mt Hood area. Post-frontal light W flow keeps mostly cloudy over the west slopes of the Cascades. A disorganized band of convergence snowfall may persist over the Mountain Loop area through approximately mid-day. Further east, expect a pleasant day with partly cloudy skies. Temperatures should be near or slightly below seasonal norms.
A weak system approaching from the NW increases the chances for light snowfall overnight. A digging trough offshore on Tuesday will increase cloud cover, spreading light snowfall into areas near and west of the Cascade Crest during the afternoon.
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 to mostly cloudy with a slight chance of rain or snow showers early.
Monday
Night
Mostly cloudy.
Monday
Mostly cloudy with a slight chance of snow showers early.
Monday
Night
Mostly cloudy with a slight chance of light snow, mainly after midnight.
Monday
Mostly cloudy with weak convergences in the mountain loop tapering off around noon.
Monday
Night
Mostly cloudy with a slight chance of light snow, mainly after midnight.
Monday
Mostly cloudy.
Monday
Night
Mostly cloudy.
Monday
Mostly cloudy. Light ridgeline and W wind at the Pass.
Monday
Night
Mostly cloudy with periods of very light snow overnight. Light ridgeline and W wind at the Pass.
Monday
Mostly cloudy. Light ridgeline and W wind at the Pass.
Monday
Night
Mostly cloudy with periods of very light snow overnight. Light ridgeline and W wind at the Pass.
Monday
Partly cloudy.
Monday
Night
Partly cloudy.
Monday
Partly cloudy.
Monday
Night
Partly cloudy.
Monday
Partly cloudy.
Monday
Night
Partly cloudy.
Monday
Cloudy with light snow tapering throughout the day. 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).