Time and Day: 1030
Wednesday
The Snapshot: Rain today, switching to moderate snow overnight and
Thursday. Snow ending Thursday afternoon and high pressure building for Friday.
The Science: Snow overnight transitioned
to rain this morning by the end of control work. As the warm front approaches
Wednesday, east flow will give out and freezing levels will rise midday. A warm
mass of upper level air will move over Washington bringing continuing rain
during the day. The trailing cold front should cross the Cascades around the
end of daylight hours Wednesday. Precipitation will transition back to snow
overnight, with some periods of moderate snow through Thursday midday. Snow will
taper and end Thursday afternoon.
The Long Range: Building high pressure
Thursday night will move over the West Coast Friday bringing a sunny and warm
day. Another trough affects the region Saturday and Sunday with the rain/snow
game continuing.
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Precipitation
Ending at 4am:
Today 24hr
water = .75-1.0 Snow = 3-5”
Tomorrow’s
24hr water = .25-.5 Snow = 2-4”
Trend and
Timing:
Rain should
occur during the rest of the daylight hours on Wednesday with a switch back
to snow just after dark. Light to moderate snow thru Thursday afternoon then
tapering off and ending by Thursday night.
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24hr temperature
ending at 4 am tomorrow:
Low: 28
High: 35
Freezing
level: 6000-3000’
Trend and
Timing:
Snow level
should raise to 6k Wednesday afternoon, then fall overnight back below Pass
level.
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24hr Winds (mph)
ending at 4 am tomorrow:
Base: E 0-5,
then W 5-10
Ridge Top: E
5-10 then WSW 10-20
Trend and
Timing:
East winds
should switch to WSW midday Wednesday and strengthen a bit as the cold front
approaches.
DV
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