A weak front passed through this morning producing a few inches of snow above 4000' along the west slopes of the Cascades with lesser amounts elsewhere. Scattered showers this morning will peter out by mid-day but moderate to strong WNW ridgeline winds can be expected in most zones through the afternoon. More sunshine should break out for the south Washington Cascades, Mt Hood, and east slopes of the Cascades especially further from away the Cascade crest while cloudier conditions will be found from about Snoqualmie Pass and northward.
Strong upper-level ridging will build offshore tonight and tomorrow leaving us with dry conditions. Low clouds trapped along the west slopes of the Cascades from I-90 and north will clear out on Monday with a sunny and pleasant day expected througout the region. Northerly winds in the alpine will kick up during the day tomorrow, mainly impacting higher terrain east of the Cascade crest and Mt. Hood.
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 cloudy with isolated light rain and snow showers this morning then mostly sunny.
Sunday
Night
Partly to mostly clear.
Sunday
Cloudy with scattered light rain and snow showers this morning then mostly cloudy with sunbreaks in the afternoon.
Sunday
Night
Mostly cloudy.
Sunday
Cloudy with scattered light rain and snow showers this morning then mostly cloudy with sunbreaks in the afternoon.
Sunday
Night
Mostly cloudy.
Sunday
Mostly cloudy with scattered light rain and snow showers this morning then partly to mostly sunny in the afternoon. Strong ridgeline winds.
Sunday
Night
Partly to mostly clear.
Sunday
Cloudy with scattered light rain and snow showers this morning then mostly cloudy with sunbreaks in the afternoon. Moderate west winds.
Sunday
Night
Partly to mostly cloudy. Light west winds at Pass level.
Sunday
Cloudy with scattered light rain and snow showers this morning then mostly cloudy with sunbreaks in the afternoon. Strong ridgeline winds. Moderate west winds at Pass level.
Sunday
Night
Partly to mostly cloudy. Light west winds at Pass level.
Sunday
Mostly cloudy with scattered light rain and snow showers this morning then partly to mostly sunny in the afternoon. Strong ridgeline winds.
Sunday
Night
Partly to mostly clear.
Sunday
Mostly cloudy with isolated light rain and snow showers this morning then mostly sunny in the afternoon. Strong ridgeline winds.
Sunday
Night
Mostly clear.
Sunday
Mostly cloudy with isolated light rain and snow showers this morning then mostly sunny in the afternoon. Strong ridgeline winds.
Sunday
Night
Mostly clear.
Sunday
Mostly cloudy with scattered light rain and snow showers this morning then partly to mostly sunny in the afternoon with periods of high clouds. Strong 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).