Stevens Pass
Mountain Weather Forecast
Date and Time: 1/2/2019 - 0630
Current Observations:
24hr Precipitation: 0
Temperature profile: 29base, 34 ridge
Pass level winds: 5-10 W
Barometer: 1017mb’s and steadily dropping
Sky: OC
Radar: Satellite images show the main cloud deck moving into Western
Washington with the incoming precipitation just offshore.
The Forecast: Rain arrives after 4pm today with a little
mixed snow at the start. Tomorrow will
just be wet with temperatures peaking in the low 40’s (40 c for you Canadians). The rain shifts to snow tomorrow night with
snow showers expected on Friday.
Long
Range: Intermittent showers are expected on Friday with a
drying trend for the weekend.
Storm water equivalent (swe) totals by 4am Saturday = 2-3”,
4-8” of snow.
The Science:
The current temperature inversion and the dropping barometer are early
indicators of the approaching frontal system.
This is another strong triple point storm. So, the leading warm front
will swing through this afternoon with warm temperatures and rain. Freezing
levels are expected to peak near 6000’ (1800m) by tomorrow morning.
The following cold front
will push in tomorrow afternoon lowering freezing levels and shifting the rain
back to snow. With some luck we will
have 6-10” of new snow to play with on Friday.
**Confidence in this event
is good.
Values from 4am today through
4am tomorrow.
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Precipitation:
Today 24hr
water: .25-.5 (1.25cm)
snow: 0
Tomorrow’s 24hr
water: 1-1.5” (3.8cm)
snow: 4-8, (+-15cm)
Trend and Timing:
The precipitating begins after 4pm
today and switches to snow after 4pm tomorrow.
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Temperature:
Low: 30f/-1c High:
38f/ 3.3c
Freezing level: 4000’- 6000’.
Trend and Timing:
Freezing levels will lift above 5000’
after 10pm tonight and remain around 6000’ through the day tomorrow.
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Winds
Base: 5-10 WSW
Ridge Top: 10-20 SW
Trend and Timing:
SW flow will strengthen tonight with
gusty ridge top winds expected tomorrow morning.
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