South Hill, Virginia 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

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FXUS66 KSEW 131641
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
841 AM PST Tue Jan 13 2026

.SYNOPSIS...
An upper level ridge will lead to dry and mild conditions into
early next week along with varying amounts of night and morning
fog across the lowlands.

&&

.SHORT TERM /TODAY THROUGH THURSDAY/...
The air mass remains quite mild and high temperatures could
approach daily records in a few spots today. The ridge will
temporarily flatten on Wednesday as a weak system passes to our
north, but it will have little perceptible affect on our
weather. Surface gradients will remain relatively light through
much of the short term forecast period which will likely allow
low clouds and fog to become more widespread over the next few
nights and mornings across much of the lowlands.

A strong upper ridge axis will take up residence just offshore
on Thursday. Near the surface, high pressure will strengthen
over the interior of British Columbia while thermally induced
low pressure creeps northward along the Oregon coast. This will
lead to increasing northerly or offshore flow across Western
Washington Thursday afternoon and evening. This should help some
areas stand a better chance of some sunshine, but the low
clouds could stubbornly hang on most of Thursday for places like
the Southwest Interior and south Puget Sound. High temperature
forecasts for Thursday across the lowlands will be a little
tricky based on how much low cloud clearing does or doesn`t
occur.


&&

.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
The upper ridge axis remains firmly in place Friday into
Saturday with varying degrees of low level offshore flow. Day to
day fog coverage will be the primary forecast challenge, but
coastal and mountain areas will likely see wall to wall sunshine
and very mild daytime temperatures. Models shift the ridge axis
onshore and weaken it somewhat early next week. Dry conditions
will continue, but the return of weak surface gradients should
result in expanded night and morning fog coverage for the
lowlands areas.

27

&&

.AVIATION...
Westerly flow aloft continues through this afternoon as
an upper ridge builds into Western Washington. Widespread MVFR/IFR
cigs early this morning with abundant moisture at the lower levels.
MVFR to LIFR cigs will continue through this morning. Areas of
fog have also developed early this morning, mainly along the
Olympic Peninsula and in the vicinity of PWT/OLM/HQM. Some
improvements in cigs may occur by early this afternoon, mainly
from PAE southwards and towards the Cascade Foothills.
Otherwise, MVFR to IFR cigs will likely continue at times
through the afternoon elsewhere. LIFR/IFR cigs and vsbys will
become more widespread by late evening with light flow at the
surface and expected fog development. Dense fog will then be
likely tonight into Wednesday. Surface winds will be light and
variable through today.

KSEA...MVFR cigs at the terminal this morning. Some improvement
to VFR will be possible by late morning into the early afternoon
hours. However, widespread LIFR conditions are then anticipated
to return by tonight. There is high confidence in fog development
tonight into Wednesday morning, with LIFR conditions potentially
developing as early as 01-03z, with greater confidence after
05-06z. Light S/SE surface winds between 3-6 kt will become
light northerly this afternoon. JD/14

&&

.MARINE...
Surface high pressure will expand northward across
area waters today. A weak frontal boundary will dissipate well
offshore Wednesday afternoon followed by strong surface high
pressure over the offshore waters shifting into the interior of
British Columbia on Thursday and a period of offshore flow
toward the end of the week. Apart from easterlies near gaps in
coastal terrain, this should be a relatively quiet period in
terms of wind across area waters.

Coastal seas will remain near 10 feet this morning, subsiding
during the afternoon and evening. Another decaying swell train
continues to be forecast to push seas back above 10 feet
Wednesday before subsiding again Thursday into the weekend. 27

&&

.HYDROLOGY...
The Skokomish River continues to slowly recede early this
morning, but will remain in minor flood stage into Wednesday.
Rivers in Skagit and Whatcom counties are cresting in action
stage and are beginning to descend now. The Flood Watch for
Skagit and Whatcom counties will likely be dropped later this
morning with the threat rapidly decreasing. Drier weather is then
expected through next weekend, with no additional flooding
expected. JD/21

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Flood Watch until 10 AM PST this morning for Cascades of
     Whatcom and Skagit Counties-Foothills and Valleys of the
     North Cascades-Lowlands of Western Skagit and
     Northwestern Snohomish Counties-Lowlands of Western
     Whatcom County.

PZ...Small Craft Advisory until 10 AM PST this morning for Coastal
     Waters From Cape Flattery To James Island 10 To 60 Nm-
     Coastal Waters From Cape Flattery To James Island Out 10
     Nm-Coastal Waters From James Island To Point Grenville 10
     To 60 Nm-Coastal Waters From James Island To Point
     Grenville Out 10 Nm-Coastal Waters From Point Grenville
     To Cape Shoalwater 10 To 60 Nm-Coastal Waters From Point
     Grenville To Cape Shoalwater Out 10 Nm-Grays Harbor Bar.

&&

$$