Time and Day: 0700
Sunday
The Snapshot: Light precipitation today with moderate to
heavy snow, wind and cooler tonight, diminishing snow showers tomorrow with another
storm developing Tuesday night. The week ends dry with clearing.
The Science: A triple point (warm, cold, occluded) frontal
system approaching the PNW will bring a
nice dose of snow to Stevens Pass tonight. With some luck, Stevens could receive a foot
of snow with enhanced orographics and persistent snow showers tomorrow.
The main action
starts later today with the passing of the warm front. Freezing levels will remain around 4000’ and
even bump up a bit with the passing of the first front. There could be a short Puget Sound Convergence
period tonight, which could be the heaviest snow period. Snow totals will be
dependent on where and how long the convergence zone decides to live.
The cold front
quickly follows which will lower temperatures and turns the general flow to NW;
this will likely shift the convergence zone south of Stevens. The snow will slowly shift to showers tomorrow
with a high pressure ridge moving in on Tuesday.
The Long Range: Long range models are being very fickle, so confidence is low with the +- 7 day outlook.
As of this morning, Tuesday’s storm appears to be gaining some energy
and should produce some more snow. High
pressure will likely bring a few days of dry weather for end the week.
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Precipitation
Ending at 4am:
Today 24hr water = .75-1
Snow = 7-12
Tomorrow’s 24hr water
= .25-.5 snow = 3-5
Trend and Timing:
Light mixed rain and
snow showers today, main precipitation hits after 4pm, snow showers
persisting tomorrow.
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24hr temperature ending at 4 am tomorrow:
Low: 27 High:
34
Freezing level: 4000’ 3000’
Trend and Timing:
Freezing levels will
stick around 4000’ today and then fall in the wake of the cold front later
tonight.
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24hr Winds (mph) ending at 4 am tomorrow:
Base: 5-10 W
Ridge Top: 5-15 NW
Trend and Timing:
Winds will intensify
tonight with gusty NW flow for the next 24-48hrs.
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jM
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