Time and Day: 0630 Monday
The Snapshot: A return to active weather
starts today. Snow vs. rain will be the game for the first
half of the week.
The Science: A change in the weather pattern will begin
today as several storm systems begin to make their way towards the PNW. Light precipitation
will spread inland today with the first band of moisture reaching Stevens Pass
in a few hours. Freezing levels will
rise to near 4000’ with this passing of the fronts, so periods of wet snow with
mixed rain will be possible. A stronger
front arrives tomorrow with moderate to heavy precipitation. Temperatures will
be on the cusp of freezing with east flow
influence through Wednesday.
Long
Range: The week will end dry with
clearing as a weak high pressure ridge passes between storms. Another system is expected on Saturday
packing more snow.
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Precipitation
ending at 4 am:
Today’s
24hr Water = < .5 Snow = 2-4
Tomorrow’s 24hr Water = .75-1 Snow =
5- 8+
Trend and Timing:
Snow with periods of mixed rain begins today and intensifies
tomorrow. Snow accumulation amounts
will be dependent on whether or not the freezing levels stay low enough.
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24hr temperature ending at 4 am tomorrow:
Low: 18 High: 32
Freezing level: 2500’- 4500.'
Trends and Timing:
Anticipate freezing levels reach +-4000’ by late this
afternoon. Freezing levels will
remain near 4000’ but with east flow
influence through Wednesday.
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24hr Winds (mph) ending at 4 am tomorrow:
Base: 0-5 E
Ridge Top: 0-10 E shifting SW
Trend and Timing:
East flow will remain at the surface while ridge
top winds above 5000’ shift southwesterly tonight. Winds aloft shift back to easterly or
southeasterly tomorrow.
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jM
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