Time and Day: 0700
Thursday
The Snapshot: Mild temperatures with light snow today, moderate
snow tonight, dry tomorrow, more snow on Saturday. Cold and clear weather will bring in the new year.
The Science: Stevens Pass received 2” of new snow
overnight. A triple point frontal system
with a southwest fetch of moisture will push another round of snow into the
Cascade Mountains later today. Temperatures are expected to spike near 320
in response to the warm air behind this morning’s
warm front. A good dose of moisture is
expected on the backside of the warm front this afternoon/evening.
As with most
triple point systems, a cold front will follow late tonight, dropping temperatures
and switching the snow to showers and, eventually bringing the precipitation to and end sometime early
tomorrow morning.
The Long Range: A low-pressure system slides down the BC coastal mountain
range with more snow in tow; this should
reach Stevens Saturday/Saturday night. A cold, dry air mass settles in over the PNW early next week. Temperatures could dip into the single digits
on Tuesday or Wednesday. No significant
snow is expected for most of next week.
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Precipitation
Ending at 4am:
Today 24hr water = .75+
Snow = 6-10
Tomorrow’s 24hr water
= .25 snow = 1-3
Trend and Timing:
Light snow this
morning with snow ramping up after 12 pm
today. Moderate to heavy snow showers ends after 7 am
tomorrow morning.
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24hr temperature ending at 4 am tomorrow:
Low: 22 High:
32
Freezing level: 4000’ –
2500’
Trend and Timing:
Freezing levels will
have a midday peak around 4000’ and then begin to fall in the wake of the
cold front early this evening.
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24hr Winds (mph) ending at 4 am tomorrow:
Base: 0-5 E
Ridge Top: 0-10
ESE
Trend and Timing:
Winds will shift from
east to west with the passing of the cold front tonight. Gusty frontal winds
should be expected.
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jM
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