Time and Day: 0700
Monday
The Snapshot: Mixed rain and snow this morning with a short
dry period tonight. Heavy snow changing
to rain tomorrow.
The Science
Current Observations: 1.36” of water that equated to around 5” of snow, fell overnight, the temperature is 32f,
the barometer is 1001mb and falling, ridge top winds are 5-10mph out of the
WSW. Radar shows the back edge of this
system just entering the Olympic Range with mixed rain and snow falling at the
Passes.
A cold front will swing through today which will keep the moisture
falling and usher in some cooler air. Westerly flow will fill in behind the
front which could enhance snowfall for a
few hours this afternoon. Tonight will
be cool and dry with some partial clearing under a weak high pressure ridge.
The Thanksgiving
Storm: As advertised, a strong, warm SW
fetch of moisture enters the region tomorrow for a Pineapple Express event. ** East flow development could (or not) allow the start of this storm to be heavy snow with possibly
some significant accumulation. The warm air streaming up from the south will eventually take over with freezing
levels soaring to 8000’ tonight. Freezing levels will remain well above 5000’
through Thanksgiving day.
Storm totals could exceed
4” of water from Tuesday 4 am through Thursday 4 pm.
The Long Range: Cooler NW flow saves the day on Friday with
freezing levels dropping back down to Pass level and snow likely for the
weekend.
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24hr Precipitation ending at 4am:
Today 24hr water: .75 snow: 4-8
Tomorrow’s 24hr water: 1-1.5 snow: 6-10
Trend and Timing:
Totals could increase due to a
possible Puget Sound Convergence zone development later today. The precipitation will begin to taper off
after 4 pm with tonight being mostly
dry. Heavy snow will slowly change to
rain through the day tomorrow.
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24hr temperature
ending at 4 am:
Low: 26 High: 32
Freezing level: 4500’ – 3500’
Trend and Timing:
Freezing levels will drop to 4000’
today. East flow will hold
temperature near freezing through noon or so tomorrow.
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24hr Winds (mph) ending at 4 am:
Base: 0-5 W
Ridge Top: 5-10 W
Trend and Timing:
Light to moderate westerly winds will
be consistent today. Winds shift
easterly overnight.
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jM
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