Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 090459
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
859 PM PST Sun Dec 8 2019

.SYNOPSIS...Western Washington will remain dry into Tuesday as an
upper level ridge builds across the Pacific Northwest. The next
system will move through on Tuesday afternoon and evening, with
an wet and unsettled pattern expected for the second half of the
week.

&&

.SHORT TERM /TONIGHT THROUGH WEDNESDAY/...Scattered light showers
that bubbled up from about Seattle south earlier today have faded
on radar in the last hour or two. Expect dry weather for the rest
of tonight into the first part of Tuesday as an upper ridge
builds in from the west. Low clouds tonight and Monday morning
should scatter later Monday.

A front will move into the area on Tuesday. It`s looking pretty
weak but should be enough to bring a few hours of light rain to
most areas - starting in the morning at the coast and then
afternoon for the interior.

There should be another dry period behind the front later Tuesday
night and Wednesday as a short wave upper ridge crosses the area.
Temperatures will continue to run slightly above normal through
the period.

.LONG TERM /THURSDAY THROUGH SUNDAY/...Previous discussion...A
period of wet and unsettled weather is in store for the second
half of the week as a series of systems moves inland across the
region. However, deterministic models and ensembles do hint at a
few breaks in the precipitation in the long term, most noticeably
on Saturday as a weak upper level ridge temporarily builds back
into the area. Temperatures in the extended timeframe will mostly
be in the mid 40s to low 50s, with overnight lows in the upper 30s
to lower 40s. 14

&&

.AVIATION...An upper ridge will move over the area tonight and
Monday with northerly flow aloft. At the surface, weak high
pressure will move over the area with light offshore flow. The air
mass is stable with low level moisture.

Low clouds will continue tonight. Locations that saw clouds lift
earlier today should see ceilings lower again tonight. There will
also be areas of reduced visibilities in fog tonight. The low
levels will dry out on Monday with clouds scattering for most
areas in the afternoon.

KSEA...Ceilings lifted to 5000-6000 feet earlier today but lower
clouds are expected to reform after midnight tonight. Clouds
should scatter entirely by early Monday afternoon. Light northerly
wind.

&&

.MARINE...Weak weak high pressure will build over the area
on Monday. A weakening front will reach area Tuesday. A stronger
frontal system will affect the area Wednesday and Thursday.

&&

.HYDROLOGY...River flooding is unlikely for the next 7 days.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...None.

&&

$$

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