Time and Day: 0600
Wednesday
The Snapshot: A winter storm warning is in effect for the
Cascades Mountains with heavy snow tonight changing to rain tomorrow and back
to snow on Friday.
The Science: The leading edge of the approaching storm is
just south of Olympia as of 5 am this morning,
and is expected to reach Stevens Pass in a few hours or so. This storm has impressive water content values
with storm totals exceeding 3” or even 4”.
Heavy snow will begin
the show with a foot or more likely through the night, snow changes to heavy
rain as freezing levels rise to +5000’ tomorrow. A cold front enters the scene late tomorrow
night which should produce some nice snow on Friday.
Yes, there is a
chance that the east flow will hold out and minimize the rain potential. However, when water contents are this high,
the atmosphere is pretty warm (8000’ freezing levels over Seattle) so it will
be a tough fight for our east flow friend.
The Long Range: Snow showers will persist into Saturday with
strong high pressure moving into place on Sunday. A dry, clear and warm airmass settles in
early next week.
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Precipitation
Ending at 4am:
Today 24hr water = 1-2
Snow = 10-14
Tomorrow’s 24hr water
= 1 snow = 2-6
Trend and Timing:
Heavy snow falling through
the night with snow changing to rain after 4am
tomorrow morning.
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24hr temperature ending at 4 am tomorrow:
Low: 18 High:
34
Freezing level: 1500’-
4500’
Trend and Timing:
Surface temperatures
will hold below freezing until early tomorrow morning. Temperatures expected to peak near 360
f around noon tomorrow.
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24hr Winds (mph) ending at 4 am tomorrow:
Base: 5-10 E
Ridge Top: 5-10 E shifting SW and strengthening.
Trend and Timing:
Easterly winds hold
steady through the night. Southerly
flow aloft takes over early tomorrow morning with strong SW winds likely.
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jM
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