A convergence zone is still going this morning between Stevens and Snoqualmie Passes along with strong WNW ridgeline winds over the central and south Cascades. This local feature will taper off later this morning as winds start to slowly ease over the next few hours. With NW flow aloft and onshore flow at the surface, we can expect scattered snow showers to continue along the west slopes of the Cascades to Mt Hood. The strongest winds will linger longest over the Mt Hood area today. An upper level feature digging on the back-side of the upper trough will keep conditions cloud along the East North zone, but further south of Hwy 2 their should be more sunshine away from the Cascade crest. A few showers may linger into the evening before conditions dry out overnight.
Upper-level riding will build offshore tomorrow. We should see scattered clouds along the west slopes of the Cascades and sunnier conditions to the east. Freezing levels will start to moderate 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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Monday
Partly to mostly cloudy with a chance of snow showers in the morning, then partly sunny.
Monday
Night
Partly cloudy.
Monday
Mostly cloudy with a chance of snow showers.
Monday
Night
Partly to mostly cloudy.
Monday
Mostly cloudy with scattered light snow showers. Moderate to strong ridgeline winds.
Monday
Night
Partly to mostly cloudy. Chance of light snow showers in the evening.
Monday
Cloudy with light to occasionally moderate snow showers in the morning, then mostly cloudy with scattered light snow showers in the afternoon. Moderate to strong ridgeline winds.
Monday
Night
Partly to mostly cloudy. Chance of light snow showers in the evening.
Monday
Cloudy with light to occasionally moderate snow showers in the morning, then mostly cloudy with scattered light snow showers in the afternoon. Moderate to strong ridgeline and Pass level winds.
Monday
Night
Partly to mostly cloudy. Chance of light snow showers in the evening.
Monday
Cloudy with light to occasionally moderate snow showers in the morning, then mostly cloudy with scattered light snow showers in the afternoon. Moderate to strong ridgeline and Pass level winds.
Monday
Night
Partly to mostly cloudy. Chance of light snow showers in the evening.
Monday
Cloudy with light scattered light snow showers. Moderate to strong ridgeline winds decreasing in the afternoon.
Monday
Night
Partly to mostly clear.
Monday
Mostly cloudy with light to snow showers in the morning, occasionally moderate near the Cascade crest, then partly to mostly cloudy with isolated light snow showers in the afternoon. Strong ridgeline winds.
Monday
Night
Partly to mostly clear.
Monday
Mostly cloudy with light to snow showers in the morning, then partly cloudy with isolated light snow showers in the afternoon. Strong ridgeline winds.
Monday
Night
Partly to mostly clear.
Monday
Cloudy with light to moderate snow showers in the morning, then mostly cloudy with scattered light snow showers in the afternoon. More sunbreaks east-side of the mountain. Strong to extreme winds decreasing in the afternoon.
Monday
Night
Partly to mostly cloudy. Chance of light snow showers in the evening.
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).