MOUNTAIN WEATHER FORECAST

Stevens Pass Mountain Weather Forecast

Day and Time:  Thursday 0700

Current Observations:

24hr Precipitation:  0

Temperature profile: 25base, 43ridge

Pass level winds: westerly and light

Barometer: 1011mb’s and falling

Sky: mostly clear with high clouds

Radar: Most of the state is dry with incoming moisture off the southern BC coast.  

The Forecast:  Light rain developing overnight with rain turning to snow tomorrow.

Long Range: Intermittent snow showers with much lower temperatures will develop through the weekend.  

  

The Science: The approaching triple point frontal system will begin to push the warm air mass east today.  The inverted temperatures will equalize with daytime temperatures peaking near 50 in the base area.

The approaching storm isn’t packing a ton of energy, and with the warm air in place, this will start out as light rain.  Cooler NW flow filters in tomorrow morning which will drop freezing levels to +-4000’.  With some luck, we will squeeze +-4” of snow out of it by Saturday morning.  

A cold arctic air mass is expected to drop in from the north on Sunday which will bring much cooler temperatures.  Bands of moisture spinning up from the south will mix with this cool air for some hopeful snow showers.    

Forecast confidence is good.   

Values from 4am today through

 4am tomorrow.

Precipitation: Today 24hr water: .10  snow: 0 Tomorrow’s 24hr water: .5  snow: 3-5 Trend and Timing: Light rain begins after 7pm with snow mixing in after 7am tomorrow.

Temperature: Low: 28  High: 50 Freezing level: 8000’ – 5000’– 4000’ Trend and Timing:    Cooling begins overnight with freezing levels falling to 4000’ by noon or so tomorrow.

Winds Base: 0-10 W Ridge Top: 5-10 W Trend and Timing: Winds will be light and westerly through tomorrow.