Renton, Virginia 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

612
FXUS66 KSEW 112315
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
315 PM PST Tue Feb 11 2025

.SYNOPSIS...Dry and cold conditions will continue through early
Thursday. A weather system passing to the south Thursday into Friday
will bring precipitation as far north as Puget Sound - with cold
temperatures in place - this may fall as a rain/snow mix during the
afternoon then snow overnight. A Pacific frontal system over the
weekend will bringing a more typical pattern of warmer and wetter
weather to the region by Sunday.

&&

.SHORT TERM /TONIGHT THROUGH FRIDAY/...Sunny, clear skies today
with highs in the 30s. Clear skies and very cold temperatures are on
track tonight into Wednesday morning and again Wednesday night into
Thursday morning.  Northeasterly winds in Western Whatcom County
have already eased, with more easterly gradients developing - and
easterly winds particularly in the Cascade gaps Wednesday night
into early Thursday morning. This will help apparent temperatures
those areas - along the I-90 corridor and Enumclaw feel especially
cold. In addition, very cold temperatures and the breezy winds at
Stevens, Snoqualmie and White Passes as well as Paradise in Mt
Rainier National Park - will support apparent temperatures as low
as minus 15 Thursday morning. As such the Cold Weather Advisory
was extended for the lowlands through Thursday and expanded to
include the Cascades of Snohomish, King, Pierce and Lewis
Counties. Make sure to bundle up if you`re heading outdoors the
next few mornings.

The next frontal system will begin to move onshore along the Oregon
coast Thursday morning, spreading precipitation northwards into
southern Washington Thursday afternoon into Thursday night. With the
persistent cold air mass already in place any precipitation even at
low levels Thursday afternoon would fall as rain/snow mix
transitioning to snow during the evening hours. Ensembles
continue to highlight a 20-30% chance of less than an inch of snow
from Everett southward, and 15-20% chance of an inch or more
south of Olympia along the I-5 corridor through early Friday
morning. The Cascades of Pierce and Lewis Counties will likely
pick up 2-3 inches of snow through this period. Temperatures are
expected to moderate somewhat Thursday evening, but will remain
below normal with low temperatures Friday morning in the upper 20s
to low 30s. Lingering precipitation Friday afternoon -mainly over
the Southern Washington Cascades will diminish Friday night as
the storm system slides south and east out of the area.

.LONG TERM /SATURDAY THROUGH TUESDAY/...The next weather system
looks to arrive on Saturday, setting the stage for shift to a more
typical pattern for the region, including a return of onshore flow,
more moderate temperatures and more widespread lowland rain and
mountain snow for the region. A wintry mix at some interior
locations remains possible Saturday morning - particularly mainly
western Whatcom County and the Cascade Valleys. By Sunday morning
expect more typical low temperatures in the mid to upper 30s and
highs well into the 40s, even near 50. Despite the trend toward
moderate temperatures at the low elevations, snow levels look to
remain at or near the pass level into early next week - keeping
wintery conditions in play there.

&&

.AVIATION...Dry northerly flow aloft will continue through the TAF
period. VFR with clear skies expected areawide today, with little to
no patchy freezing fog expected to develop tonight into Wednesday
morning as dew points look to remain quite low across the region.
Surface winds generally N to NE 5 to 12 kt this afternoon
weakening overnight and becoming more easterly on Wednesday.

KSEA...VFR with clear skies persisting through the period. Surface
winds generally N/NE 8 to 12 kt this afternoon will lessen
overnight and shift more easterly on Wednesday.

&&

.MARINE...Fraser River outflow will subside today as a surface
ridge over the interior of British Columbia weakens. A broad surface
low approaching the offshore waters Wednesday night into Thursday
will enhance offshore flow with Small Craft Advisory easterly
winds expected in the west entrance to the strait and portions of
the coastal waters adjacent to gaps in terrain. The low will
weaken as it moves into the Oregon coastal waters late in week. A
more organized frontal system will reach the area over the weekend
with headlines for both wind and seas expected.

15

&&

.HYDROLOGY...No river flooding expected over the next 7 days.


&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Cold Weather Advisory until 4 PM PST Thursday for Admiralty
     Inlet Area-Bellevue and Vicinity-Bremerton and Vicinity-
     Central Coast-East Puget Sound Lowlands-Eastern Strait of
     Juan de Fuca-Everett and Vicinity-Hood Canal Area-Lower
     Chehalis Valley Area-North Coast-San Juan County-Seattle
     and Vicinity-Southwest Interior-Tacoma Area-Western Skagit
     County-Western Strait of Juan De Fuca-Western Whatcom
     County.

     Cold Weather Advisory from 4 PM Wednesday to 4 PM PST Thursday
     for West Slopes North Central Cascades and Passes-West
     Slopes South Central Cascades and Passes.

PZ...Small Craft Advisory from 7 PM Wednesday to 4 PM PST Thursday
     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-West Entrance U.S. Waters Strait Of Juan De
     Fuca.

     Small Craft Advisory from 4 PM Wednesday to 4 PM PST Thursday
     for Coastal Waters From Point Grenville To Cape Shoalwater
     10 To 60 Nm-Coastal Waters From Point Grenville To Cape
     Shoalwater Out 10 Nm.

&&

$$