MOUNTAIN WEATHER FORECAST

Stevens Pass Mountain Weather Forecast

Date: Sunday, December 15, 2019

Current Observations:

24hr Precipitation:     .26 / 3”

Temperature profile:  27 base / 23 mid mtn

Pass level winds:   West, light

Barometer:    1013 rising

Sky:     Obscured, snowing lightly

Radar:  Light, spotty precipitation across the PNW

The Forecast: Cool with light snow ending Sunday afternoon, dry with slightly warming temps and partly cloudy skies Monday.

Long Range: Monday and Tuesday will be benign as high pressure sits over the PNW, but active weather returns on Wednesday. Too early for details but freezing levels hovering around Pass level (hopefully with a little east flow) and moderate to heavy precipitation look likely Thursday-Saturday.  

  

The Science: NW flow aloft continues today as the trough deepens across the center of the US and the high pressure ridge that has formed offshore moves east. Moist air in the lowest levels of the atmosphere has been responsible for the orographic light snow accumulations the past few days, but that dries up this afternoon bringing an end to snow showers. A weak warm front passing to our north on Monday will bring partly cloudy skies.

Confidence: Good for day 1-3, poor for freezing levels late in the week.

Values from 4am today through 4am tomorrow.

Precipitation: Today 24hr water: LT .10 snow: Trace Tomorrow’s 24hr water: 0  snow: 0 Trend and Timing: Very light snow flurries ending Sunday afternoon.

Temperature: Low: 20   High: 28 Freezing level: 1500’ Trend and Timing:    Cooling trend Sunday night into Monday morning.

Winds Base: W 0-5 Ridge Top: W 5-15 Trend and Timing: Consistent light westerly winds today and Monday, east winds through the Pass developing Monday. -Dan