We're in for a quiet start to the week weather-wise. The upper low that brought a few inches of snow on Sunday to the Washington Cascades will slide toward the intermountain West this afternoon as weak upper level ridging builds over the PNW. There are a few clouds in the 4000-7000' range but otherwise mostly sunny skies are expected today. After a cold start to the morning with mountain temperatures in the mid teens to 20s, temperatures and freezing levels will rebound nicely into the 5500-6500' range across the region this afternoon. A stiff N-NW breeze can be found at ridgeline level along the Cascade crest and down to Mt Hood this morning as well.
The weak upper-level ridge will slowly shift into eastern WA/OR tonight and tomorrow. This will keep dry conditions in place over the short term. A frontal system upstream along the central B.C. coast will spread a few high clouds into the area during the day 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 low clouds in the morning.
Monday
Night
Mostly clear.
Monday
Mostly sunny. A few low clouds in the morning.
Monday
Night
Mostly clear.
Monday
Mostly sunny. A few low clouds in the morning.
Monday
Night
Mostly clear.
Monday
Mostly sunny. A few low clouds in the morning.
Monday
Night
Mostly clear.
Monday
Mostly sunny. A few low clouds in the morning.
Monday
Night
Mostly clear.
Monday
Mostly sunny. A few low clouds in the morning.
Monday
Night
Mostly clear.
Monday
Mostly sunny. A few low clouds in the morning.
Monday
Night
Mostly clear.
Monday
Mostly sunny. A few low clouds in the morning.
Monday
Night
Mostly clear.
Monday
Mostly sunny. A few low clouds in the morning.
Monday
Night
Mostly clear.
Monday
Mostly sunny. A few low clouds in the morning. Moderate to strong winds in the morning decreasing in the afternoon.
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).