Temperatures are chilly but still several degrees warmer than yesterday this morning under mostly clear skies. The Pacific Northwest sits on the backside of an elongated E-W upper trough across the central part of the continent. An upper low will stretch this feature out as it slides into Oregon tonight. This will cause a bit of an unusual wind event for April; strong E-NE winds will develop for most areas late this afternoon through a good chunk of Tuesday. The strongest winds will impact the Mt Hood area, the east slopes of the Cascades near and south of Hwy 2, and the major Cascade Passes and the West South. These easterly offshore winds will be with the same areas on and off for much of the week.
This wind event will be under mostly clear skies although an upper shortwave will stir up some afternoon clouds over the north Cascades and even a slight chance of a shower over the East North and Washington Pass area this afternoon. A slow but steady warming trend will start today and continue through tomorrow.
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
Mostly sunny. A few clouds in the afternoon.
Monday
Night
Mostly clear.
Monday
Mostly sunny in the morning. Partly to mostly sunny in the afternoon.
Monday
Night
Mostly clear.
Monday
Mostly sunny in the morning. Partly to mostly sunny in the afternoon.
Monday
Night
Mostly clear.
Monday
Mostly sunny in the morning. Partly to mostly sunny in the afternoon.
Monday
Night
Mostly clear. Strong ridgeline winds.
Monday
Mostly sunny in the morning becoming partly to mostly cloudy in the afternoon.
Monday
Night
Partly cloudy in the evening then mostly clear. Moderate to strong ridgeline winds.
Monday
Mostly sunny in the morning. Partly to mostly sunny in the afternoon.
Monday
Night
Mostly clear. Strong ridgeline winds.
Monday
Mostly sunny in the morning becoming partly to mostly cloudy in the afternoon. Chance of light showers in the afternoon.
Monday
Night
Partly cloudy in the evening then mostly clear. Moderate ridgeline winds.
Monday
Mostly sunny in the morning. Partly to mostly sunny in the afternoon.
Monday
Night
Mostly clear. Strong ridgeline winds.
Monday
Mostly sunny in the morning. Partly to mostly sunny in the afternoon.
Monday
Night
Mostly clear. Strong ridgeline winds.
Monday
Mostly sunny in the morning. Partly to mostly sunny in the afternoon. Strong ridgeline 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).