Mountain Weather Forecast

Stevens Pass Mountain Weather Forecast

Day and Time: Sunday 0715

Current Observations:

24hr Precipitation:   .25” SWE / 4” snow (6% density)

Pass temperature:  19 degrees

Pass level winds:  Light, easterly

Barometer:  Falling slowly, 1010 mbs

Sky: OVC

Radar: Light to moderate showers across the state.

The Forecast: Partly cloudy with diminishing snow showers today, temperatures remaining cool. Partly cloudy with a light snow flurry or two on Monday, at continuing low freezing levels.

  

The Science: A low pressure trough extending from interior Canada is directing cold air across the PNW. The upper level flow is moving across the Pacific and picking up some moisture, but most of that moisture is riding the strongest flow into Northern Oregon. Washington is picking up light showers from bands of moisture rotating through the trough. The east side of the Cascades should see some moderate accumulations due to the upslope orographic effect as an embedded low pressure feature moves through the trough.

Long Range:  A high pressure ridge sitting out in the Pacific leans inward a bit on Monday and Tuesday, pushing the trough a little further east and diminishing the potential for moisture. Temperatures remain cool all week, with a few inches possible during the second half.

Values from 4am today through

 4am tomorrow.

Precipitation: Today 24hr water: .10  snow: trace-2” Tomorrow’s 24hr water: <.10  snow: trace Trend and Timing: Light snow ending Sunday afternoon, mostly dry Monday.

Temperature: Low: 14    High: 25 Freezing level: 500’ Trend and Timing:    Steady cool temperatures.

Winds Base: E 10-15 Ridge Top: E 10-25 Trend and Timing: East winds becoming gusty Sunday afternoon/Monday morning.