Time and Day: 0655
Monday
The Snapshot:
Moderate snow today, turning heavy tonight and continuing Tuesday with warming
temperatures and gusty winds.
The Science
Current Observations:
2” of new overnight, with
temperatures remaining cool. It is currently 22 on the upper mountain and 27 in
the base area. Winds are moderate from the west. It is cloudy and snowing
lightly. The barometer edged up slightly overnight to 1016, and should begin
dropping any minute.
The Forecast:
Pre-frontal moisture delivered the
preliminary shot of lower density snow this morning. The main front is still
offshore but will continue its march eastward during the daylight hours.
Consistent precip rates (light-moderate) will continue during the day Monday,
with intensities ramping up after 8pm. Moderate snow continues Monday night
with gusty winds.
WNW upper flow will
continue to pump moisture into the region on Tuesday, with heavy snow likely
during the day Tuesday at warming temperatures. Snow level looks to remain
below our Pass level on Tuesday, but Snoqualmie might be sad. The high pressure
ridge in the eastern Pacific builds in amplitude Tuesday afternoon, cutting off
moisture and ending the snow event Tuesday evening.
The Long Range: Wednesday looks dry and mild, with partly cloudy skies. The ridge
retrogrades (flattens out) allowing NW flow to bring another system into
northern Washington on Thursday. Most of the moisture appears to favor the
northern half of the state, with light snow and clouds possible at Stevens
Pass. Active weather is possible for next weekend.
24hr values daily 4am to 4am.
Precipitation:
Monday’s 24hr
water: .75-1.0 Snow: 10-12”
Tuesday’s 24hr
water: .75-1.0 Snow: 8-10”
Trend and Timing:
Moderate
snow during the day Monday, 4-6” likely during operations. Heavier snow
Monday night and Tuesday morning, with heavy snow continuing during the day
Tuesday. Snow ends Tuesday afternoon.
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Temperature:
Low: 22 High: 33
Snow level: 3500’
Trend and Timing:
Temperatures
will creep up during the day and overnight lows will be higher than in recent
days.
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Winds
Base: W 10-15
Ridge Top: WSW 20-35
Trend and Timing:
Winds
will increase during the day Monday, remaining moderate-strong and gusty thru
Tuesday morning.
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