Stevens Pass
Mountain Weather Forecast
Day and Time: Sunday 0800
The Snapshot: Dry today with increasing clouds. The rain vs snow game begins early tomorrow
morning. Light rain on Tuesday with
colder temperatures and snow showers expected for the rest of the week.
Current Observations:
Precipitation:
0
Pass
temperature: 26
Pass
level winds: 5-10 E
Barometer:
Holding at 1019mbs
Sky:
Clear
Radar:
Rain along the coast with high clouds moving inland.
The Forecast: Mixed rain and snow below 5000’ begins after
midnight tonight. The precipitation will
intensify through the day. The
precipitation (likely rain) shifts to light showers on Tuesday.
Long
Range: Colder temperatures and
intermittent snow showers will persist Wednesday through Friday. With some luck
we could pick up an additional 4-6” of snow leading into the weeekend.
The Science:
The large low pressure system stirring in the Gulf of Alaska will slowly drift
east over the next 12-14hrs. A triple
point frontal system is leading the charge.
The leading warm front is timing out to pass over the Cascade crest
sometime after midnight tonight. How the
strong SW flow mixes with the cool east flow will determine whether the
precipitation is white or clear.
Models have the east flow
being overtaken on Tuesday with some upper level ridging breaking up the
moisture stream. The trailing cold front
moves through late Tuesday with unstable cooler air filling in.
Values from 4am today through
4am tomorrow.
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Precipitation:
Today 24hr
water: 1 snow: 2-4
Tomorrow’s 24hr
water:.25-.5 snow: 0
Trend and Timing:
Mixed rain and snow arrives after midnight
tonight and intensifies through the day.
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Temperature:
Low: 30 High: 36
Freezing level: 3000’ – 4500’.
Trend and Timing:
Freezing levels will rise to 4000’
today and then to 4500’ or even 5k tomorrow.
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Winds
Base: 0-10 E
Ridge Top: 5-10 ESE
Trend and Timing:
East flow at the surface with SSE flow
aloft will be the wind pattern through early Tuesday morning.
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