0630 Friday:
The Snapshot: Mostly
dry with sun breaks today. Winter storm
advisory tomorrow, the year ends cold and dry.
The Science: The anticipated winter storm rolling south along the
BC coast is still on track to bring snow the Cascades starting early tomorrow
morning. If the western edge of this
system pulls enough moisture off of the coastal waters, a good foot or more of
snow will fall in the Cascade Mountains tomorrow. A weak Puget Sound Convergence Zone will also
play a part in providing some additional orographics. It all comes to an end on early Sunday morning
as cold, stable air flows in from the north. Powder Day.
4-7day
Long Range: Remnant snow showers linger into Monday as
high-pressure strengthens. Temperatures
may fall into the single digits Monday night/early Tuesday morning. The final week of the year will be sunny, cool
and dry.
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Precipitation ending at 4am:
Today’s 24hr Water
= <.25 Snow = 0-2
Tomorrow’s 24hr Water =1+ Snow = 10-15
Trend and Timing:
Snow begins to fall early tomorrow morning and
will continue just past midnight. Snow
begins to diminish on Sunday.
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24hr temperature ending at 4am tomorrow:
Low: 22 High: 28
Freezing level: 2500’ 3500’
Trends and Timing:
Freezing levels will inch up to near 3500’ by
tomorrow afternoon. Temperatures will
then fall back down on Sunday.
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24hr Winds (mph) ending at 4am tomorrow:
Base: 0-5 WNW
Ridge Top: 0-10 WNW
Trend and Timing:
The winds don’t appear to be significant at this
time, but expect some pre and post frontal windy periods.
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JM
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