Time and Day: 0630
Monday
The Snapshot: A winter storm watch begins today with heavy snow and wind expected in the mountains this
evening and tomorrow. Snow is likely to
continue into Wednesday morning with another system coming into play for the
end of the week.
The Science: The leading edge of the approaching frontal
system is currently just making landfall along the Olympic Peninsula. Snow should begin to fall at Stevens this
afternoon and intensify through the night.
A warm airmass ahead of the front will temporarily bump freezing levels
up to +-3500’ late tonight. Strong cool
westerly flow with PS convergence zone effects will greet the day tomorrow with
heavy orographic snow likely for most of the day.
The Long Range: More snow arrives on Thursday and then a weaker
system again on Saturday. Long term
models indicate cold and dry heading into the New Year.
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Precipitation
Ending at 4am:
Today
24hr water = .75-1 Snow = 8-12
Tomorrow’s
24hr water = 1 snow = 8-14
Trend and Timing:
Snow
begins after 2 pm today and ramps up
through the night. Convergence showers
persist through most of tomorrow.
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24hr temperature ending at 4 am tomorrow:
Low:
22 High: 26
Freezing
level: 3500’ – 2500’
Trend and Timing:
Temperatures
will peak (+-260 ) around
midnight tonight. Freezing levels will
then fall to around 2500’ tomorrow.
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24hr Winds (mph) ending at 4 am tomorrow:
Base:
5-10 W
Ridge
Top: 10-2- W
Trend and Timing:
A
short period of easterly flow will occur today. Winds shift westerly tonight and strengthen
through the early morning hours.
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jM
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