Time and Day: 0700 Friday
The Snapshot: Cooling today, moderate rain
changing to snow tonight, moderate snow Saturday changing back to rain by
Sunday and Monday.
The Science: The edge of the cold front is
just offshore this morning. Temperatures will cool when it crosses east of the
mountains later today. A low-pressure trough will move in from behind the front with strengthening westerly flow; this will bring lower temperature and snow
for Saturday.
After the trough crosses
Washington tomorrow, the upper-level flow
will become SW oriented, bringing rising freezing levels and heavy
precipitation (rain) Saturday night and Sunday.
The Long Range: SW flow with heavy
rain will continue Sunday and Monday, with a drying trend Tuesday.
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Precipitation
Ending at 4am:
Today
24hr water = .5-.75 Snow = 2-4
Tomorrow’s
24hr water = 1-1.5 snow = 8-10
Trend
and Timing:
Rain
changing to snow overnight, moderate snow Saturday, heaviest in the
afternoon/evening, changing back to rain after midnight.
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24hr
temperature ending at 4 am tomorrow:
Low:
30 High: 35
Freezing
level: 6,000’- 3,000.'
Trend
and Timing:
Freezing
levels will fall below pass level by this
afternoon, and further by Saturday morning.
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24hr
Winds (mph) ending at 4 am tomorrow:
Base:
0- 5 E, shifting 5-15 W
Ridge
Top: 10-20 WSW
Trend
and Timing:
Light
winds today, increasing after the frontal passage midday today.
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DV
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