Time and Day: 0630 Thursday
The Snapshot:
Rain switched to snow around midnight last night, giving Stevens Pass 3" by 4am. Light snow showers today with moderate snow tonight.
The Science:
A low pressure trough is currently moving ashore north of the OR/WA border. As it moves NE, strengthening westerly winds behind it will bring orographic snow showers tonight through Friday morning. The next, negatively tilted, upper level trough will bring a strong cold front across our forecast area Friday night.
The Long Range:
After Friday night's frontal passage, snow showers will end mid-day Saturday with cool temperatures. A break from the active weather will be seen Saturday afternoon through Sunday morning before another front arrives Sunday afternoon. Drier weather developing starting Monday.
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Precipitation Ending at
4am:
Today 24hr water = .75 Snow = 6-8
Tomorrow’s 24hr water = .75
snow = 6-8
Trend and
Timing:
Light snow showers today turning to moderate snow this afternoon and overnight. Precipitation should be heaviest between 10pm and 2am Friday.
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24hr temperature ending at 4
am tomorrow:
Low: 28 High:
33
Freezing level: 4000’ -
3500’
Trend and Timing:
Freezing level will be at or below pass level all day, with a brief bump in temperatures this afternoon as a pocket of warm air moves across the forecast area. Temperatures cooling by Friday morning.
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24hr Winds (mph) ending at 4
am tomorrow:
Base: 5-10 E shifting
W
Ridge Top: 5-10 WSW shifting West 10-20
Trend and
Timing:
Variable winds today, shifting West this afternoon and overnight.
253 Dan |
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