Time and Day: 1100 Monday
The Snapshot: 39 degrees with clear skies as of 11 am this morning. Clouds increase tonight with
wind and rain beginning tomorrow morning. Some snow will be added to the mix
tomorrow afternoon, but no significant accumulation is expected below 5000’.
The Long Range: Moderate
to heavy rain continues into the weekend with things beginning to dry out early
next week.
The Science: The skies are currently clear over Stevens Pass with the
barometer at 1021mb and the RH at 50%. A
cold front, associated with a strong low-pressure
system in the Gulf of Alaska, will slide down the Canadian coast over the next
24hrs. The main action begins tomorrow
morning with strong zonal westerly flow entering the mountains. High winds and heavy precipitation can be
expected tomorrow with a lull in the action tomorrow night. A pocket of cooler air will briefly fill in
behind the cold front for a period of mixed snow between 4000’ and 5000’.
The jet stream will begin
to sag south on Wednesday pulling in warmer air and a long fetch of moisture.
Heavy rain with freezing levels peaking around 8000’ can be expected Wednesday
night into Thursday.
Storm totals for the week
= +-5” of rain with little to no snow accumulation below 4500’.
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24hr Precipitation ending at 4am:
Today 24hr water: .10 snow: 0
Tomorrow’s 24hr water: 1+ snow: 0-2
Trend and Timing:
Light rain begins after
4 am tomorrow and increases through the
day. Mixed snow can be expected
tomorrow afternoon with a brief dry period tomorrow night.
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24hr temperature
ending at 4 am:
Low: 30 High: 45
Freezing level: 7000’ – 4500’
Trend and Timing:
Freezing levels will drop to 4500’
tomorrow afternoon and then trend back up to 7000’ plus on Wednesday.
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24hr Winds (mph) ending at 4 am:
Base: 5-10 W
increasing tomorrow
Ridge Top: 5-15 W
Trend and Timing:
Winds will begin to strengthen early
tomorrow morning with strong post-frontal
winds likely tomorrow afternoon.
40+mph gust will be possible along the ridgetops. The wind
quickly diminishes and shift SW on Wednesday.
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jM
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