MOUNTAIN WEATHER FORECAST

Stevens Pass Mountain Weather Forecast

Day and Time: Friday 0630

Current Observations:

24hr Precipitation: SWE = 1.75” with 0” of snow in the base are and +3” on the upper mountain.

Temperature profile: 33base, 30ridge

Pass level winds: 5-10 W

Barometer: holding low at 1006mb’s

Sky: OC

Radar: abundant scattered showers west of the crest with light snow falling in the mountains.

The Forecast:  Intermittent snow showers are expected to continue through the weekend.  With some luck, we could have +6” of new snow on the ground by the end of the day on Sunday.

Long Range: The southern storm track will remain active through next week with several pulses of moisture spinning up though the region.  The freezing levels could revisit the +5000’ mark on Tuesday/Wednesday with a possibility of more rain.   

  

The Science:  A cold front passed east of the Cascade Crest about an hour ago. The associated low pressure system will head NE into southern Canada leaving the atmosphere unstable over the PNW.  The warm southerly flow aloft is still influencing surface temperatures with freezing levels around 4200’.  Cooler air will eventually filter as east flow develops overnight. 

A more organized system spins up from the south early Sunday morning with some potential measureable snow.  

Values from 4am today through

 4am tomorrow.

Precipitation: Today 24hr water: .25  snow:1-3 Tomorrow’s 24hr water: .25-.5  snow: 2-4 Trend and Timing: Light snow showers are expected through early Sunday morning.

Temperature: Low: 30    High: 32 Freezing level: +-4000’ Trend and Timing:    Freezing levels will hold steady through tomorrow.

Winds Base: 0-5 W shifting E Ridge Top: 5-15 WSW Trend and Timing: South westerly  flow aloft will slowly shift easterly over the next 24hrs.

Glossary Terms: 

Storm Water Equivalent (SWE) = how much water is in the snow or rain.

Triple Point: A frontal system that has a warm front, a cold front and an occluded front that all circulate around a common point