Time and Day: 0800 Friday
The Snapshot: Lots-o-rain and wind today, AKA The Atmospheric River. Rain is expected to change to snow early Sunday
morning and then taper off.
The good news, surfs
up.
The Science: Almost an inch of rain has fallen since midnight
last night with an additional 2-3” likely through early Sunday morning. A weak cold front will move through early
tomorrow morning briefly dropping freezing levels +-4500’. A surface low traking along the Oregon/Washington
border will bump the temperatures back up tomorrow as it pulls warm in from the
south. Therefore, expect a few hours of mixed snow changing back to rain
tomorrow. A colder and dryer air mass arrives on Sunday leaving a few inches of
snow on the ground before it ends.
Sunday night will be mostly dry with a chance of a few light snow
showers.
Long
Range: Hit repeats
on Monday afternoon - a few inches of snow Monday night changing to rain on
Tuesday. Models are trending with higher freezing
levels (+6000’) for Monday night and Tuesday – bummer. Another update will be posted this afternoon.
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Precipitation
ending at 4am:
Today’s
24hr Water = 2.5 Snow = 1-3
Tomorrow’s 24hr Water = .75-1
Snow = 1-3
Trend and Timing:
Heavy rain today, mixed snow and rain tomorrow
morning with mostly rain during the day tomorrow. Rain turns to snow after 4 am Sunday
morning and then tapers off through the day.
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24hr temperature ending at 4 am tomorrow:
Low: 30 High:
42
Freezing level: 7000’ 4500.'
Trends and Timing:
Mild temperatures today and tomorrow. A brief drop in freezing levels occurs between
2 am and 10 am tomorrow. Surface
temperatures bump back up to near 400f tomorrow afternoon.
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24hr Winds (mph) ending at 4 am tomorrow:
Base: 5-15 WSW
Ridge Top: 10-20 WSW
Trend and Timing:
The winds will be strong today with ridge top gust
+40mph. Winds diminish tonight and
shift easterly tomorrow.
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JM
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