Stevens Pass Mountain Weather
Forecast
Date: Sunday, February 1, 2020
Current
Observations:
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24hr Precipitation: 3.02” rain / 0” snow
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Temperature profile: 38 degrees base / 36
degrees mid mtn
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Pass level winds: 10-20 mph gusts from the west
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Barometer: 1010 and falling
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Sky: Obscured
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Radar: Widespread heavy rain
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The Forecast: Blustery with rain
changing to snow this morning, moderate snow continuing with dramatic cooling
during the day, further cooling and snow ending Saturday night.
The Science: A vigorous cold front will
sweep thru Washington in the next few hours, lowering freezing levels and
switching upper level flow westerly. Precip type will rapidly switch to snow,
with convergence showers continuing during the day. Winds have the potential to
be sporty with the frontal passage, but time will tell if we get sheltered by
surrounding terrain. Cold airmass advection will lower freezing levels to near sea
level by Saturday night, with moist onshore flow Sunday. A lowland snow event
is possible on Sunday.
Long Range: Light
snow showers on Sunday at continued cool temperatures will be followed by brief
ridging and a mostly dry day Monday. Active weather is in store for the middle
of the week with snow likely, details to come in the next few days.
Confidence: Poor for exact snow amounts today given timing of switchover
to snow and exact location of convergence zones.
Values from
4am today through 4am tomorrow.
Precipitation:
Today
24hr
water: 1" snow: 6-10”
Tomorrow’s
24hr
water: .25
snow: 2-4”
Trend and
Timing:
Precip type should shift to snow mid-morning (7-10am) with moderate to
heavy snow in convergence showers midday, snow tapering off Saturday afternoon
and ending overnight.
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Temperature:
Low: 20 High: 38
Freezing
level: 6000’ – 1000’
Trend and
Timing:
Rapid and dramatic cooling during the day and overnight Saturday.
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Winds
Base: W
10-20
Ridge
Top: WSW 30-40 with gusts
Trend and
Timing:
Winds should peak mid-morning, becoming gusty for a few hours. They
will ease throughout the day becoming light by Saturday night.
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