The weather varies greatly this morning from north to south and east to west across our forecast region. Some locations are downright stormy, while others are very pleasant.
Bands of precipitation continue to target areas near and south of I-90 with the stormiest weather on Mt Rainier, Mt Saint Helens, and Mt Hood. This pattern should continue throughout the day. In these locations expect periods of moderate snow and stronger winds. Snoqualmie Pass will sit right on the northern edge of the main focus of precipitation making it less clear just how stormy it will be. Look for all the passes to slowly warm this morning as easterly flow quickly weakens and turns west. While Stevens and White Passes should stay all snow, Snoqualmie should switch to rain mid-morning. Elsewhere in the region, cloudy skies, occasional showers, and generally light winds will be the norm.
Showers taper off this evening as a transient high pressure ridge starts to approach the coast. Precipitation will hold on the longest in the southern forecast zones and on Mt Hood, but overall the trend will be for drying. Low level moisture should maintain cloudy skies unless you make it higher on one of the volcanoes.
The ridge approaches and passes overhead on Tuesday. With lingering moisture trapped at lower elevations, it could be a bit drippy in the morning, but there shouldn't be much in the way of real showers. By the afternoon we'll start a short 12-hour dry spell ahead of our next storm system.
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
Cloudy with a few isolated showers, mainly in the southern and western Olympics.
Monday
Night
Cloudy with a few isolated showers.
Monday
Cloudy with a few isolated showers. Minor sun breaks possible.
Monday
Night
Cloudy with a few very isolated showers.
Monday
Cloudy with isolated showers, heaviest south of Hwy 2.
Monday
Night
Cloudy with a few isolated showers.
Monday
Cloudy with light to moderate showers. Heaviest on the volcanoes.
Monday
Night
Cloudy with showers tapering in the evening. Light to moderate W winds.
Monday
Cloudy with isolated showers. E flow turning W in the early morning and warming.
Monday
Night
Cloudy with a few sprinkles. Westerly flow in the pass.
Monday
Cloudy with light to moderate showers. Snow changing to rain at Pass level mid-morning. Light east flow turning west in the early morning
Monday
Night
Cloudy with showers tapering overnight. Light to moderate W winds.
Monday
Cloudy with a few sun breaks possible. Isolated light showers.
Monday
Night
Cloudy with a few very isolated sprinkles. Light to moderate W winds decreasing.
Monday
Cloudy with a few isolated showers mainly near the crest. Light to moderate W winds.
Monday
Night
Cloudy with a few sprinkles near the crest. Moderate WNW winds decreasing slightly.
Monday
Cloudy with isolated showers. Light to moderate W winds.
Monday
Night
Cloudy with a few sprinkles. Moderate WNW winds decreasing slightly.
Monday
Stormy with periods of moderate rain/snow. Strong and gusty winds decreasing slightly.
Monday
Night
Cloudy with showers decreasing overnight. Moderate to strong and gusty W winds decreasing slightly.
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).