A weakening front continues to fall apart as it passes over the mountains this morning bringing a few scattered showers and a dusting of snow to some trailhead locations. You could encounter a few short-lived rounds of precipitation before things begin to dry out during the day. As drier air seeps into the region, look for any remaining showers to end from south to north. Locations closer to the Canadian border should continue to experience scattered showers throughout the day and overnight. From Hwy 2 south, you may see the sun later in the day as the region catches a break before more active weather for the first part of the week.
On Monday the jet stream drifts south from Canada and focuses its firehose on the Pacific Northwest bringing more widespread rain and snow to the mountains. The heaviest precipitation appears to stay in the northern half of the forecast region. However, despite this event only being 24hr away, weather models continue to show a large spread in total precipitation during the day. Subtle shifts in the jet north or south could make a big difference in how wet you get Monday. Snow levels remain mild and hang around 3500-4500' before climbing Monday night. Warm and wet weather should continue for the first part of the week as an atmospheric river places the region in its sights.
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
Cloudy with isolated showers. Moderate SW winds.
Sunday
Night
Cloudy with scattered showers. Strong SW winds increasing overnight.
Sunday
Cloudy with scattered showers. Moderate SSW winds.
Sunday
Night
Cloudy with rain and snow. Strong S winds increasing overnight.
Sunday
Cloudy with scattered showers. Moderate SW winds.
Sunday
Night
Cloudy with isolated showers. Strong S winds increasing overnight.
Sunday
Cloudy with isolated showers in the morning. Sun breaks possible. Moderate SW winds.
Sunday
Night
Partly cloudy becoming cloudy. Strong SW winds.
Sunday
Cloudy with isolated showers this morning. Sun break possible. Light E flow at Pass level.
Sunday
Night
Becoming cloudy. Light east flow at Pass level. Moderate SW ridgetop winds.
Sunday
Cloudy with isolated showers in the morning. Sun breaks possible. Light E flow at Pass level. Moderate SW ridgetop winds.
Sunday
Night
Becoming cloudy. Light E flow at Pass level. Strong SW ridgetop winds.
Sunday
Mostly cloudy with isolated showers. Moderate SW winds.
Sunday
Night
Cloudy with isolated showers. Moderate SW winds.
Sunday
Cloudy with very isolated showers in the morning. Partly cloudy to mostly sunny in the afternoon. Moderate to strong SW 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).