0830 Thursday:
The Snapshot: Sunny and warm today; snow wind and rain begins tomorrow night and lasts
through the first half of next week.
The Science: A strong frontal system will bring heavy snow
to the Cascade Mountains starting tomorrow night. The air mass will be warm with the arrival of
this front so rain can be expected to start, but it will quickly turn to snow
once the front moves through. Strong, cool, unstable westerly flow (convergence and high winds) will develop on Saturday with moderate to heavy snow through the day. As of now current storm totals are:
Snow: 4-6” by 4am Saturday
4-6 by 4pm
Saturday
4-6 by 4am
Sunday morning for a total of 12-18”.
There will be a lull in the
action Sunday night with more snow (additional +-4”) on Monday/Tuesday. Warm advection is associated with this system
so a mixture of rain will also be part of the package.
Long Range: High-pressure
building off the PNW coast will bring and end to the precipitation on
Wednesday.
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Precipitation ending at 4am:
Today’s 24hr Water = 0 Snow =
Tomorrow’s 24hr Water = +- .5 Snow = 4-6
Trend and Timing:
Today and
most of tomorrow will be dry. Rain
turning to snow arrives tomorrow night.
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24hr temperature ending at 4am
tomorrow:
Low: 38 High: 50+
Freezing level:
8000.'
Trends
and Timing:
Freezing
levels will remain high through late tomorrow night and then fall to 2000’
early Saturday morning.
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24hr Winds (mph) ending at 4am
tomorrow:
Base: 0-5 E
Ridge Top: 0-10 ESE
Trend
and Timing:
Light east
flow has developed in response to the approaching system. Winds will shift SW then West
tomorrow. Strong winds can be
anticipated on Saturday.
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JM
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