Time and Day: 0800 Sunday
The Snapshot:
Clear and cold today, moderate snow beginning Monday afternoon turning
heavy by Tuesday morning with a warming trend.
The Science:
Clear and cold over Washington this morning with temperatures at Stevens
Pass in the mid-teens. Surface high pressure and dry northerly flow aloft will
maintain sunny and cold conditions in the Cascades today. Things will begin to
get interesting again Monday afternoon. A strong westerly jet stream will
become centered over Washington State and carry an embedded trough across the
forecast area Monday night and Tuesday morning. There will be a brief warming
trend with freezing levels rising to 3000-3500 feet early Tuesday morning. East
flow may help keep local freezing levels at Stevens Pass a bit lower.
Orographic snow showers will continue in strong zonal
flow Tuesday and Wednesday morning. Brief high pressure will move across the
area Wednesday afternoon providing a short break.
The Long Range: Behind Wednesday’s short-lived high
pressure ridge, continued westerly flow and a low pressure trough will swing
through Washington on Thursday/Friday for another snow event.
Precipitation Ending at 4am:
Today 24hr water = 0 Snow = 0
Tomorrow’s 24hr water = 1.0 Snow
= 10-12
Trend and Timing:
Snow will begin Monday afternoon and
quickly become heavy overnight, continuing Tuesday.
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24hr temperature
ending at 4 am tomorrow:
Low: 15 High:
22
Freezing level: 500’
Trend and Timing:
Temperatures will remain cool with low
freezing levels through 4am Monday morning, then begin to rise.
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24hr Winds (mph) ending at 4 am tomorrow:
Base: 0-5 Variable
Ridge Top: 5-10 SSW
Trend and Timing:
Light east winds at Pass level through
Monday morning, ridgetop winds shifting from northerly to SSW overnight.
DV |
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