Time and Day: 0630 Tuesday
The Snapshot: Snow changing to rain today, intermittent showers overnight, heavy rain on
Thursday, snow on Friday.
The Science: This
morning’s radar has the leading edge of the approaching warm front just
entering the west slopes of the mountains; snow changing to rain can be
expected to begin near daybreak. The precipitation
will turn to intermittent light showers overnight with the next stronger front hitting
Stevens Pass tomorrow afternoon. Heavy
rain can be expected tomorrow night
through most of Thursday with freezing levels topping out around 6500’.
The Long Range: A cold front following the rain
event Thursday afternoon/evening will likely
change the rain back to snow before it comes to
an end. There is potential for snow
on Friday with the weekend trending dry at the moment.
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Precipitation Ending at 4am:
Today 24hr water = .5 Snow = 0-2
Tomorrow’s 24hr water = .5 snow = 0
Trend and Timing:
Today’s precipitation could start out
as snow but will switch to rain by noon or so. Rain changes to showers late this afternoon
with light showers through the night and most of tomorrow.
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24hr temperature
ending at 4 am tomorrow:
Low: 28 High:
38
Freezing level: 4000’ - +5500’
Trend and Timing:
Freezing levels should rise above the
upper ridge by noon or so today.
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24hr Winds (mph) ending at 4 am tomorrow:
Base: 0-5 E
Ridge Top: 5-10 SSW
Trend and Timing:
Weak east flow at the surface with
southerly flow aloft will continue. A
short period of gusty winds could accompany the passing of the front this
afternoon.
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jM
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