Time and Day: 0630 Thursday
The Snapshot:
Snow begins today and continues through early Sunday morning. A prolonged dry
period begins on Sunday and will likely last through most of the first week of December.
The Science
Current Observations:
The temperature is 290f , the RH is 92%, the barometer has fallen
to 1018mb and the winds are +-5mph and out of the east. The sky is mostly clear with high clouds
beginning to move in.
The Forecast:
A cold front, currently
just off the coastal waters, is pushing the next batch of moisture into the
region. Radar has light snow starting to
fall along the western slopes and is expected move east and intensifies through
the day.
The cold front is timing
out to reach the Cascade Crest sometime late this afternoon or early evening. As with typical cold frontal passages, the precipitation
will shift to light showers and the
freezing levels will drop. Therefore, expect
the snow to diminish overnight with a brief dry period starting out the day tomorrow.
A low-pressure trough, powered by cool NW flow, will swing in
tomorrow afternoon bringing with it a steady stream of moisture. Fairly steady snowfall
is expected to continue into early Sunday
morning.
The Long Range:
Sunday marks the start of a prolonged
dry period with a strong blocking ridge of high pressure developing over the
PNW.
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24hr Precipitation ending at 4am:
Today 24hr water: .5” snow: 3-5”
Tomorrow’s 24hr water: .75+ snow: 6-8”
Trend and Timing:
Snow today tapering off tonight. Snow returns tomorrow afternoon.
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24hr temperature
ending at 4 am:
Low: 26 High: 32
Freezing level: +- 3500’-3000’
Trend and Timing:
With the aid of east flow, the freezing
levels should hold at or just above 3500’ today. Cooler air begins to arrive early tomorrow
morning.
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24hr Winds (mph) ending at 4 am:
Base: 0-5 E shifting W
Ridge Top: 0-10 SSW
Trend and Timing:
East flow at the surface with
southerly flow aloft will be the general
wind pattern today. Once the front
passes east of the crest, the winds will shift westerly and strengthen a bit.
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jM
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