Time and Day: 0700
Thursday
The Snapshot:
Temperatures will increase today with light
mixed rain and snow showers expected tonight and tomorrow. A short dose of good snow is shaping up for
early Saturday morning. The rest of the
weekend will be dry with some potential sunshine.
There may be a freezing rain (ice) component tonight –
so be careful out there.
Weather lesson for the
day: Freezing rain is not rain that
freezes as it falls, but rain that lands
on very cold surfaces and freezes to form ice on that surface. J
The Science
Current Observations: Clouds are starting to roll in with temperatures in
the 20’s. The barometer is currently sitting
at 1017mb as slowly descending. The
winds are easterly 5-10mph. Satellite
images have most of the incoming activity currently to the south of Stevens
Pass.
The Forecast: A low-pressure
trough approaching the west coast will push out this stagnate air mass today. This will open the door for warm moist
southerly flow to enter the region. The
big question is how the warm air aloft mixes with the leftover cold air and how the precipitation plays into that. There is not a huge amount of moisture with
the first push so expect just light mixed snow/rain with a potential of
freezing rain through tomorrow.
Cold front
swings in early Saturday morning with a
short, intense shot of snow possible. The
timing for this is currently between midnight Friday and 10 am Saturday.
That timing will be fined tuned later today or tomorrow.
The Long Range: The snow ends mid-morning
on Saturday with the weekend trending dry and clear. Another system lifts up from the south on
Monday.
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24hr Precipitation ending at 4 a.m:
Today 24hr water: .25 snow: 1-2”
Tomorrow’s 24hr water:.75+ snow: 6-8”
Trend and Timing:
Light mixed rain and snow start this afternoon with intermittent
showers through the day tomorrow.
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24hr temperature
ending at 4 a.m:
Low: 22 High: 28
Freezing level: 5000’
Trend and Timing:
Freezing levels will rise to 5000’
tonight and hover around that elevation into the early morning hours of
Saturday. East flow will help hold surface
temperature near freezing through that period as well.
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24hr Winds (mph) ending at 4 a.m:
Base: 0-5 E
Ridge Top: 5-10 E
Trend and Timing:
East flow will continue through
tomorrow.
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jM
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