Time and Day: 0715 Sunday
The Snapshot: Light to moderate snow today with a warming trend,
dry on Monday with partly cloudy skies.
Current Observations: 26
degrees on the upper mountain and 30 in the base area with light westerly
winds. Light snow has just begun to fall. RH is 94% and the barometer has
dropped a few ticks in the past 6 hours.
The Science: Things are playing out as
expected this morning with an elongated trough out in the Pacific digging
southward. This is driving southwesterly upper level flow and a warm front
towards Washington State. The weak high pressure ridge has flattened and is
moving east, pushing most of the associated moisture into the northern half of
Washington. An offshore pressure gradient is forecast to develop which would
drive easterly flow through the Cascade passes, even though winds are currently
from the west. Free air freezing levels should rise to around 5,500’ Sunday
night, but east flow should be in place for most of the time period that we
receive precip which would ideally fall as snow.
On Monday the trough
becomes a cut-off low dropping towards California with surface high pressure
developing over the PNW. Monday should be dry during the daylight hours with
another trough in westerly flow moving over the area Monday night and Tuesday
for another shot of light to moderate snow at lowering freezing levels.
The Long Range: The trickle in continues Wednesday with a few inches
of snow possible at 2,000-3,000 freezing levels. Thursday/Friday currently
looks promising with potential for a genuine snow event setting up.
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24hr Precipitation ending at 4am:
Today 24hr water: .5-.75” Snow:
6”
Tomorrow’s 24hr water: .25-.5 Snow:
2-4”
Trend and Timing:
Light to moderate snow during the day
Sunday with a warming trend overnight. Daylight hours Monday look dry, with
snow developing again overnight.
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24hr temperature
ending at 4am:
Low: 27 High: 34
Snow Level: 3,000-5,500’
Trend and Timing:
East winds may insulate Stevens Pass
throughout Sunday, with a warmup after 10pm possible.
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24hr Winds (mph) ending at 4am:
Base: E 0-5, then variable 0-5
Ridge Top: ESE 5-15, then SW 10-15
Trend and Timing:
East winds should develop Sunday
morning and be in place most of the day before switching to the WSW
overnight.
DV
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