A cold front with heavy precipitation and strong winds will sweep through the Cascades late morning for the Washinton Cascades and closer to noon for the Mt Hood region. Freezing rain should continue for Stevens, Snoqualmie and areas east of Hwy 2 until after the cold front passage. In these areas, a brief period of westerlies and onshore gradients will help mix in some relatively milder air at Pass level Monday afternoon and bring a pause to freezing rain. Precipitation should become much lighter and more showery Monday afternoon.
In our rapid fire storm pattern, yet another low pressure system will affect the area tonight and tomorrow. A warm front will lift north tonight, affecting the Mt Hood area first and the southern Washington Cascades overnight. An occluded front will pass inland Tuesday afternoon. Once again, there's a chance for freezing rain at Snoqualmie beginning this evening through Tuesday early afternoon, but Stevens *should* remain colder this time around. There will be a mix of snow levels elsewhere, generally cooler to the north and milder to the south. South of the upper low and behind tomorrow's front, there looks to be an extreme burst of westerly winds from about Snoqualmie Pass southward. The track of the low will determine who sees the strongest winds.
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
Stormy with moderate to heavy rain and snow through mid-morning, then mostly cloudy with light scattered rain and snow showers.
Monday
Night
Light showers becoming light to moderate rain and snow after midnight.
Monday
Stormy with moderate to heavy rain and snow through mid-morning, then mostly cloudy with light scattered rain and snow showers.
Monday
Night
Light showers becoming light to moderate rain and snow after midnight.
Monday
Stormy with moderate to heavy rain and snow through mid-morning, then mostly cloudy with light scattered rain and snow showers.
Monday
Night
Light showers becoming light to moderate rain and snow after midnight.
Monday
Stormy with moderate to heavy rain and snow through late morning, then mostly cloudy with light scattered rain and snow showers.
Monday
Night
Light showers becoming moderate rain and snow after midnight.
Monday
Light to moderate freezing rain increasing late morning, then becoming light scattered rain and snow showers in the afternoon. Light to moderate east winds at Pass level becoming west in the afternoon.
Monday
Night
Light showers becoming light to moderate rain and snow after midnight.
Monday
Moderate freezing rain increasing late morning, then becoming light scattered rain and snow showers in the afternoon. Light to moderate east winds at Pass level becoming west in the afternoon.
Monday
Night
Light showers becoming light to moderate rain and snow or freezing rain after midnight.
Monday
Light to moderate rain and snow, with areas of freezing rain then scattered rain and snow showers in the afternoon.
Monday
Night
Light showers becoming light to moderate rain and snow after midnight.
Monday
Light to moderate freezing rain increasing late morning, then becoming light scattered rain and snow showers in the afternoon.
Monday
Night
Light showers becoming light to moderate rain and snow after midnight.
Monday
Light to moderate freezing rain increasing late morning, then becoming light scattered rain and snow showers in the afternoon.
Monday
Night
Light showers becoming light to moderate rain and snow after midnight.
Monday
Light rain and snow becoming moderate to strong mid-day, then light showers late. Strong winds.
Monday
Night
Becoming stormy overnight with rain, snow and winds increasing.
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).