Time and Day: 1030
Thursday update:
No changes in this mornings
forecast. We will have to endure some
light rain tonight and tomorrow before it changes to snow early Saturday
morning. There are signs of Saturday's snow being downgraded.
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
24 hr water:.5-.75 snow: 4-6”
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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