MOUNTAIN WEATHER FORECAST

Stevens Pass Mountain Weather Forecast

Day and Time: Monday 0700

Current Observations:

Precipitation: .16 SWE, 2” of snow since noon yesterday

Temperature profile: 28b/ 27r

Pass level winds: 0-5 W

Barometer: 1013mbs and holding

Sky: thin layer of mid level clouds

Radar: there are a few left over showers out along the coast with dry conditions inland.

The Forecast:  Today and tomorrow will be mostly dry with the Sun making an appearance.  A cooling trend will begin with temperatures dipping into the upper teens tonight.  There will be another dose of snow on Wednesday.

Long Range: A prolonged dry and clear period begins on Thursday as high pressure develops over the PNW.   The last weekend of 2018 will come to and end under dry and mostly clear weather.  

  

The Science:  A weak mid-level high pressure ridge will slowly drift into place today. A low pressure system driving through Oregon will promote cold air from the interior west to flow into eastern Washington.  Freezing levels will drop below 1000’ under this offshore/east flow influence.

The next frontal system of interest is currently developing west of the Aleutians Islands.   Models have this system arriving on Wednesday for another dose of snow for the Cascades.  High pressure rebounds and strengthens on Thursday.    

Values from 4am today through

 4am tomorrow.

Precipitation: Today 24hr water:  0 snow: 0 Tomorrow’s 24hr water: 0  snow:0 Trend and Timing: Dry through early Wednesday morning.

Temperature: Low: 18    High: 28 Freezing level: 3000’ – 1000’ Trend and Timing:    Freezing levels will fall below 1000’ today.  Low freezing levels will persist for the first half of the week.

Winds Base: 0-5 E Ridge Top: 5-10 E Trend and Timing: Westerly flow shifts easterly today.