Time and Day: 1030 Sunday
The Snapshot: Moderate convergence snow showers today
and tonight, ending Monday morning. Colder and dry Monday.
The Science: 28”
of snow in the past 2 ½ days, and it keeps coming. After a trough passed
Saturday night, westerly flow has maintained light snow showers this morning.
Another short wave trough will move through Western Washington during the day
today, and continued upper level westerly flow will provide good orographic
uplift for moderate snow during the day. A convergence zone currently looks to
set up to the north of Stevens Pass this afternoon, and to the south (centered
over Snoqualmie Pass) Monday morning. A slight shift in either of those events
could lead to more precipitation by Monday morning.
The Long Range: An offshore upper low, and surface
high pressure building from Southern BC, will support cold and dry air moving
into the forecast area beginning Monday afternoon and likely lasting through
the middle of the week.
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Precipitation Ending at 4am:
Today 24hr water =.5-.75 Snow = 6-8”
Tomorrow’s 24hr water =.25 Snow = 2-4”
Trend and Timing:
Snow showers should be light to
moderate through Monday morning, possibly heavier in convergence. Day 2
precip amounts will most likely be during the day Monday.
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24hr temperature
ending at 4 am tomorrow:
Low: 18 High:
28
Freezing level: 1500’
Trend and Timing:
Temperatures should peak Sunday
afternoon, cooling consistently through Monday morning.
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24hr Winds (mph) ending at 4 am tomorrow:
Base: W 5-10
Ridge Top: W 5-15
Trend and Timing:
Winds should shift from SW to W during the
day Sunday, and remain westerly through Monday morning.
DV
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