MOUNTAIN WEATHER FORECAST

Stevens Pass Mountain Weather Forecast

Day and Time:  0700 Friday

Current Observations:

24hr Precipitation:        .38swe, 2” of snow 

Temperature profile:     33 base, 30 ridge

Pass level winds:            light, westerly

Barometer:                    1012mb’s holding

Sky:                               OC

Radar: lights snow falling at Stevens with convergence zone activity over the I-90 corridor.

The Forecast: Light snow today with possible sun breaks this afternoon.  Temperatures will try and hit 40 this afternoon.  Another foot of snow by Sunday morning?

Long Range:  Snow showers linger into Monday with a drying, clearing and warming trend beginning on Tuesday.

  

The Science:  Tomorrow: Another late winter storm is preparing to enter the regions with a foot of snow possible by Sunday noon or so.  The leading edge of the frontal wave is expected arrive mid-morning. The trailing cold front will swing through during the afternoon with falling temperatures and westerly flow filling in.  Freezing levels will start out 4500-5000’ and then fall below 4000’ through the day.   Convergence orographics with gusty westerly winds will be likely.

Long range. A weak low pressure cell will keep showers and cloudy conditions in the discussion through Monday.  A high pressure ridge begins to build on Tuesday for a good dose of sunny spring weather for the remainder of the week.  

Forecast confidence:  Good.  There are always questions with convergence conditions but things are shaping up nicely for good snow event.

Values from 4am today through

 4am tomorrow.

Precipitation: Today 24hr water: .25  snow: trace Tomorrow’s 24hr water: .75-1  snow: 8-12 Trend and Timing: Light passing mixed rain and snow showers today.  The main push of moisture arrives after 7am tomorrow morning with mixed rain and snow shifting to snow.

Temperature: Low: 30  High: 40 Freezing level: 5500’ – 4000’ Trend and Timing:    Freezing levels will peak above 5k this afternoon and then begin to fall early tomorrow morning.

Winds Base: 0-5 E shifting W Ridge Top: 0-10 NE shifting E Trend and Timing: Weak east flow at the surface today.  Gusty westerly winds can be expected with tomorrow’s storm.