MOUNTAIN WEATHER FORECAST

Stevens Pass Mountain Weather Forecast

Day and Time:  Thursday 0800

Current Observations:

24hr Precipitation:        .18swe, 0 snow

Temperature profile:     37 base – 40 ridges

Pass level winds:            light, SW

Barometer:                    1022mb’s and falling

Sky:                               OC

Radar:  light rain falling at Stevens with a fairly large swath of moisture hitting the western slopes.

The Forecast:  Rain today with daytime temperatures reaching +-50^0f . Rain persist through tomorrow with freezing levels remaining at or above 5000’.

Long Range: The final weekend of the season will likely be dry and sunny.

  

The Science:  The leading warm front of an approaching triple point system will bring warm WSW flow into the region today.  The warm air advection is underway with the associated moisture just now entering the mountains.   Freezing levels will peak near 7500’.   The following cold front will swing through late tonight or early tomorrow morning.  Temperatures will fall in the wake of the cold front but not enough to produce snow below 5000’.

A high pressure ridge begins to build late Friday with clearing and cool northerly flow developing for the weekend. 

Forecast confidence:  Models are in agreement for the next 36-48hrs, so confidence is good.

Values from 4am today through

 4am tomorrow.

Precipitation: Today 24hr water: .5-.75  snow: 0 Tomorrow’s 24hr water: .25-.5   snow: 0 Trend and Timing: Rain today and tomorrow.

Temperature: Low: 34  High: 50 Freezing level:  7500’ – 5500’ Trend and Timing:    Freezing levels peak > 7000’ this afternoon and then fall to +-5500’ after midnight.

Winds Base:  0-10 WSW Ridge Top: 5-15 SSW Trend and Timing: Southerly flow will shift westerly through the day.  Some periods of gusty ridge top winds can be expected.