MOUNTAIN WEATHER FORECAST

Stevens Pass Mountain Weather Forecast

Day and Time: Wednesday 0700

Current Observations:

24hr Precipitation:  Lightly snowing.

Temperature profile: 23b, 18r

Pass level winds: 0-10 E

Barometer: 1014mbs and falling

Sky: OC

Radar: Wide spread moisture is entering the western portion of the state with snow falling at a 1000’ and higher.  

The Forecast: Snow today with temperatures in the mid 20’s.  Dry tomorrow with another storm poised to enter the PNW on Friday.

Long Range:  Moderate to heavy precipitation with rising levels are expected to begin Friday afternoon. We can expect snow changing to mixed rain early Saturday morning with the moisture switching back to snow on Sunday.

  

The Science:  A cold front with cool NW flow in tow will swing through the regions today.  There is a warm, moist airmass out ahead of the front which is today’s source of the snow and slightly warmer temperatures.   Once the front passes later today, temperatures will fall, the flow turns WNW.  Hopefully we will get some nice orographic snowfall before it quickly ends early tomorrow morning.

A weak high pressure ridge moves through tomorrow with a strong warm front preparing to impact the PNW on Friday/Saturday.  Currently, models have freezing levels peaking above 5000’ on Saturday with moderate to heavy rain possible.  

Values from 4am today through

 4am tomorrow.

Precipitation: Today 24hr water: .75  snow: 6-8 Tomorrow’s 24hr water: .10   snow: trace Trend and Timing: Snow intensifies today and then tapers off early tomorrow morning.

Temperature: Low: 20    High: 26 Freezing level: 1000’-3500’ Trend and Timing:    Freezing levels spike near 3500' today and then fall back to +-2000' tonight.

Winds Base: 0-5 E shifting W Ridge Top: 5-10 ESE shifting W Trend and Timing: Weak east flow will shift westerly today with the passing of the front.