Time and Day: 0630 Tuesday
The Snapshot: Dry with sun breaks today, wind and snow tonight and
tomorrow, snow on Thursday changing to heavy rain on Friday/Saturday.
The Science: Clouds will thicken this afternoon as a cold
front approaches the region. Snow will
begin to fall on Stevens Pass after dark and intensify during the early morning
hours. The winds will also be strong
with the development of the Puget Sound Convergence Zone (PSCZ). The PSCZ may be aimed just south of Stevens
Pass with the winds coming from the WNW.
Models are beginning to downgrade snowfall amounts with this system
producing only 6-10” of snow. A weak high-pressure
ridge between systems will bring and end to the snow Wednesday night with light
snow showers lingering into Thursday. There is a chance to squeeze a few more inches
of snow on Thursday before it changes to rain.
Long
Range: Friday and Saturday will be very
wet with heavy rain and high freezing levels. Several inches (+5”) of rain will
be possible through the weekend.
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Precipitation
ending at 4am:
Today’s
24hr Water = .25 Snow = 2-4
Tomorrow’s 24hr Water = +-.5
Snow = 3-6
Trend and Timing:
Snow begins tonight and intensifies after midnight
tonight. Convergence conditions may
aid in snow amounts.
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24hr temperature ending at 4 am tomorrow:
Low: 28 High:
34
Freezing level: 4500’ 3500.'
Trends and Timing:
Freezing levels will fall below 4000’ with the
passing of the front tonight.
A warming trend begins Thursday.
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24hr Winds (mph) ending at 4 am tomorrow:
Base: 5-15 WNW
Ridge Top: 10-20
NWN
Trend and Timing:
Westerly winds will be consistent through tomorrow
morning.
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JM
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