South Hill, Virginia 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

068
FXUS66 KSEW 170534
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
934 PM PST Tue Dec 16 2025

.SYNOPSIS...
A period of very active weather will dominate the week
ahead as a series of frontal systems produce cascading impacts
across Western Washington. In addition to ongoing river flood
concerns, another period of windy conditions is expected
tonight into early Wednesday. Snow levels will tumble to the
passes by early Wednesday with blizzard conditions expected in
the mountains. Cool, unsettled conditions will remain in place
through the remainder of the week with substantial additional
snowfall in the mountains.

&&

.SHORT TERM /TONIGHT THROUGH THURSDAY NIGHT/...
A stronger system will continue to move across the area through
tonight into Wednesday, bringing mountain snow, lowland rain,
and breezy conditions through much of the area. Active weather
looks to continue throughout the short term, with the hazards
listed down below.

The following key messages with this secondary system and week
ahead are outlined below.


* RAIN: With this secondary system, we will see rain amounts
  generally in the mountains around 1 to 3 inches, with an inch
  or less in the lowlands through Wednesday evening. Initially
  this evening, the snow levels will remain high, generally
  around 8000 to 9000 feet, which will keep the landslide risk
  elevated. There is also a very slight chance of an isolated
  thunderstorm or two developing Wednesday morning, but the
  likelihood of any thunderstorm remains low. For more
  information regarding hydrology and river flooding, please
  refer to the .HYDROLOGY section down below.

* SNOW: This secondary system moving later this evening will
  have snow levels initially start at 8000 to 9000 feet, slowly
  lowering them, especially after midnight, down to 2000 to 2500
  feet. Ample moisture from this system will result in
  significant mountain snowfall for the Cascades and Olympics.
  Snow will be heavy at times along with breezy winds up to 45
  mph, therefore, a Blizzard Warning has been issued for late
  tonight into Wednesday afternoon. We could see totals around
  10 to 15 inches at Snoqualmie Pass, with 15 to 20 inches at
  Stevens, and upwards to 2 to 3 feet at Mount Baker and Mount
  Rainier. A convergence zone will set up over the Cascades
  which could locally drive amounts up further. With upslope
  flow and additional systems, snow will continue at the
  mountains through Thursday, with additional winter headlines
  likely needed for the Cascades.

* WINDS: Winds will continue to increase this afternoon and evening,
  with widespread gusts up to 50-55 mph along the coast and up to 40-
  45 mph across the interior. Southwesterly winds this afternoon
  will shift west to northwesterly later this evening, with the
  highest gusts later tonight through the Strait of Juan de Fuca and
  inland into western Snohomish County. The breezy winds, combined
  with deeply saturated soils, raises the risk of downed trees and
  localized power outages.

* COASTAL HAZARDS: Minor coastal flooding remains possible along
  the San Juan County island coastlines during Wednesday`s high
  astronomical tide. The threat of minor coastal flooding shifts
  to along the Pacific Coast on Thursday and Friday. Seas will
  also build along the Pacific Coast Wednesday morning,
  generating large breaking waves that may pose a danger to
  beachgoers and cause localized coastal erosion.

&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...
Active weather looks to continue throughout the long term, with
a series of systems arriving throughout the weekend and into the
first half of next week. Lowland rain and mountain snow will
continue as snow levels remain near or just below pass levels.
Cool and unsettled conditions will remain.

Mazurkiewicz

&&

.AVIATION...
A strong frontal system will trek across the
region early this TAF period, bringing gusty west winds, rain,
and IFR to MVFR flight conditions. Gusts of 30 to 45 kts are
expected with the main push of the front and will likely occur
for only an hour or two. The strongest gusts will be at the
coastal terminals. As the front moves through there remains a
non-zero chance of an isolated, low topped thunderstorm. Gusty
25 to 30 kt winds are forecast behind the front with 60-80%
confidence in VFR flight conditions. A lull in rain is expected
by mid to late morning on Wednesday with only isolated rain
chances and reduced flight conditions. This potential is
reflected by either a PROB30 group or TEMPO group at the most
likely effected terminals. Otherwise, VFR flight conditions with
elevated winds through Wednesday afternoon. Rain chances and
MVFR flight conditions return after 00Z Thursday.

LLWS is expected with and behind the front at KPAE as strong, west
to northwest winds aloft funnel through the nearby Strait of Juan de
Fuca. Additionally, a zone of weak winds will develop Wednesday
morning somewhere near the interior terminals. The most likely
terminal to see this weak zone, and associated light winds, is KPAE.
However, if this zone shifts, either KBFI or KSEA could see the
lighter winds.

KSEA...As the front approaches the terminal early this TAF period,
expect gusty winds of 30 to 35kts, periods of light to moderate
rain, reduced visibilities and ceilings. An isolated gust near 40kts
cannot be ruled out as the front rolls through. There is high
confidence (around 80%) that behind the front, VFR flight conditions
will persist much of Wednesday with isolated light rain chances and
gusty 20 to 25kt winds. A weaker system approaches the terminal
after 00Z Thursday, brining a return of MVFR flight conditions and
rain.

&&

.MARINE...
A strong frontal system will continue to cross the Pacific Northwest
late tonight into early Wednesday, bringing elevated winds and seas
to the region. Gale force winds will cover all area waters by this
evening, with the strongest winds through the central and eastern
Strait of Juan de Fuca and into Admiralty Inlet by early
Wednesday morning reaching storm force. Winds will remain
elevated but will gradually ease into Wednesday afternoon with
SCA winds continuing over the coastal waters and through the
Strait of Juan de Fuca. A low pressure system will cross the
region on Thursday, keeping small craft advisory winds across
the coastal waters.

Seas around 11 to 14 feet will continue to build to 15 to 21 feet by
early Wednesday morning. Seas will gradually subside to 10 to 14
feet by Thursday, where they will remain through Friday. Seas will
subside to below 10 feet over the weekend.

15

&&

.HYDROLOGY...
Major flooding is possible on the Skagit river
beginning Wednesday morning in the upper reaches with the flood
crest reaching Mount Vernon Wednesday night. Several other
rivers are forecast to reach minor to moderate flood but there
is a fair amount of uncertainty with the crests, especially due
to how quickly and and how low the snow level gets.

A flood watch is in effect through Thursday afternoon across the
lowlands.

The landslide threat remains very elevated will continue to be high
through at least tomorrow.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Wind Advisory until 6 AM PST Wednesday for City of Seattle-
     Eastern Kitsap County-Eastside-Foothills and Valleys of
     Central King County-Foothills and Valleys of Pierce and
     Southern King Counties-Foothills and Valleys of Snohomish
     and Northern King Counties-Foothills and Valleys of
     Thurston and Lewis Counties-Foothills and Valleys of the
     North Cascades-Lowlands of Lewis and Southern Thurston
     Counties-Lowlands of Western Whatcom County-San Juan
     County-Shoreline / Lynnwood / South Everett Area-Willapa
     and Black Hills.

     Coastal Flood Advisory from 2 AM to 8 AM PST Wednesday for San
     Juan County.

     Flood Watch through Thursday afternoon for Cascades of Pierce
     and Lewis Counties-Cascades of Snohomish and Northern
     King Counties-Cascades of Southern King County-Cascades
     of Whatcom and Skagit Counties-City of Seattle-Downtown
     Everett / Marysville Area-Eastside-Foothills and Valleys
     of Central King County-Foothills and Valleys of Pierce
     and Southern King Counties-Foothills and Valleys of
     Snohomish and Northern King Counties-Foothills and
     Valleys of Thurston and Lewis Counties-Foothills and
     Valleys of the North Cascades-Foothills of the Western
     and Southern Olympic Peninsula-Grays Harbor County Coast-
     Lower Chehalis River Valley-Lowlands of Lewis and
     Southern Thurston Counties-Lowlands of Pierce and
     Southern King Counties-Lowlands of Western Skagit and
     Northwestern Snohomish Counties-Lowlands of Western
     Whatcom County-Middle Chehalis River Valley-Olympia and
     Southern Puget Sound-Olympics-Shoreline / Lynnwood /
     South Everett Area-Willapa and Black Hills.

     Blizzard Warning from 2 AM to noon PST Wednesday for Cascades
     of Pierce and Lewis Counties-Cascades of Snohomish and
     Northern King Counties-Cascades of Southern King County-
     Cascades of Whatcom and Skagit Counties-Olympics.

     High Wind Warning until 6 AM PST Wednesday for Downtown
     Everett / Marysville Area-Eastern Strait of Juan de Fuca-
     Foothills of the Western and Southern Olympic Peninsula-
     Grays Harbor County Coast-Island County-Lake Crescent
     Area Including US 101-Lower Chehalis River Valley-
     Lowlands of Pierce and Southern King Counties-Lowlands of
     Western Skagit and Northwestern Snohomish Counties-Middle
     Chehalis River Valley-Northern Hood Canal-Northern
     Washington Coast-Olympia and Southern Puget Sound-Port
     Townsend Area-Southern Hood Canal-Western Strait of Juan
     de Fuca.

     Coastal Flood Advisory from 1 AM to 7 AM PST Wednesday for
     Island County-Port Townsend Area.

     High Surf Advisory from 1 AM to 10 AM PST Wednesday for Grays
     Harbor County Coast-Northern Washington Coast.

PZ...Small Craft Advisory until 4 PM PST Wednesday for Grays Harbor
     Bar.

     Gale Warning until noon PST Wednesday 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-West Entrance U.S.
     Waters Strait Of Juan De Fuca.

     Gale Warning until 11 PM PST this evening for Admiralty Inlet-
     Central U.S. Waters Strait Of Juan De Fuca-East Entrance
     U.S. Waters Strait Of Juan De Fuca.

     Storm Warning until 6 AM PST Wednesday for Admiralty Inlet-
     Central U.S. Waters Strait Of Juan De Fuca-East Entrance
     U.S. Waters Strait Of Juan De Fuca.

     Gale Warning until 6 AM PST Wednesday for Northern Inland
     Waters Including The San Juan Islands-Puget Sound and
     Hood Canal.

&&

$$