Stevens Pass Mountain Weather
Forecast
Friday, March 13, 2020, 0900
Current Observations:
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24hr Precipitation: .01 swe,
1” of snow
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Temperature profile: 26 base,
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Pass level winds:
light to moderate easterly
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Barometer: 1009mb’s and falling
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Sky: obscure and snowing
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Radar: widespread moisture over
western Washington tracking SSE.
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The Forecast: Snow today with
falling temperatures and gusty winds, snow tapers off early tomorrow morning
with clear and sunny condition expected by Sunday.
The Science: The anticipated low pressure system is making
its move this morning spreading precipitation into the region. This storm has a few components that may
prevent Stevens Pass from getting significant snow. First, it is tracking north to south along
the coast, so the direct impact will be to the southern and eastern Cascades. Second, it is moving fast, and thus the
period of precipitation will be fairly short lived. Third, a cold, dry air mass is driving in
from the NE – this will aid in drying the upper atmosphere thus, the moisture
content is fairly low. Once the storm
exits the region tomorrow, the cold dry air will settle in with clear skies and
low temperatures for the remainder of the weekend.
Long Range. Next week will mostly dry with
warmer air returning. There are no
significant moisture events in the long range outlooks.
Confidence: Moderate to the questionable storm track.
Values from 4am today through 4am tomorrow.
Precipitation:
Today
24hr
water: .25
-.5 snow: 3-5
Tomorrow’s
24hr
water: .10
snow: trace
Trend and
Timing:
Light snow through the day with the moisture tapering off after 4am
tomorrow.
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Temperature:
Low: 14 High: 24
Freezing
level:3000’ – 0 (sea-level)
Trend and
Timing:
Freezing levels will fall to sea- level over the next 24hrs. Low temperatures at the Pass will be in the
low teens or even briefly touch single digits.
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Winds
Base: 5-15 E
gusty
Ridge
Top: 10-25 east with gust 40+ possible
Trend and
Timing:
East winds will strengthen this afternoon with gusty ridgetop winds
likely.
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