MOUNTAIN WEATHER FORECAST

Stevens Pass Mountain Weather Forecast

Date: Saturday, February 29, 2020

Current Observations:

24hr Precipitation:  .57” SWE / 8” snow

Temperature profile: 30 base / 26 mid mtn

Pass level winds: Light westerly

Barometer: 1012 rising slowly

Sky:  Overcast, snowing lightly

Radar: Spotty convergence showers throughout the crest.

The Forecast: Diminishing showers and cool this afternoon. Partly sunny and dry tomorrow with daytime warming.  

The Science: A low pressure trough deepens and sags southeast today, turning upper level flow northerly. NW post-frontal winds should diminish today, with cooler and drier air advection this afternoon and tomorrow. We’ll see if an afternoon convergence zone keeps the snow showers going. Either way the day should finish with clearing skies and tomorrow should start out dry and partly sunny.

Long Range: The next system rides over a flat high pressure ridge Sunday night/Monday. Snow is likely Monday, although amounts aren’t particularly impressive. Active weather continues throughout the week with a wetter system arriving Wednesday.

Confidence: Fair for today’s afternoon convergence activity.

Values from 4am today through 4am tomorrow.

Precipitation: Today 24hr water: .25-.5 (.25 already received) snow: 4-6” (4” already received) Tomorrow’s 24hr water: .10-.25   snow: 1-3” Trend and Timing: Snow showers ending this afternoon, mostly dry tomorrow, light snow possible after midnight Sunday.

Temperature: Low: 22   High: 28 Freezing level: 2000-1000’ Trend and Timing:    Freezing levels dropping tonight, remaining cool tomorrow with some daytime warming.

Winds Base: W 5-15 Ridge Top: WNW 20-30 with gusts, then W 10-15 Trend and Timing: Post-frontal winds should rapidly diminish Saturday afternoon and become light Saturday night and Sunday.