West Linn, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

656
FXUS66 KPQR 242205 AAA
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
304 PM PDT Tue Jun 24 2025

.SYNOPSIS...Continued onshore flow and broad upper level troughing
will bring cooler and cloudier conditions Wednesday through Friday,
with chances for light rain along the coast and north of Salem
Wednesday into Thursday. Warm and dry weather is anticipated this
upcoming weekend into early next week with high temperatures well
into the 80s by Sunday for inland locations and lower 70s at the
coast.

&&

.DISCUSSION...Little change in the pattern today as broad
onshore flow in the wake of a passing shortwave trough maintains
benign weather conditions across the Pacific Northwest. Satellite
imagery from early Tuesday morning continued to show low marine
stratus clouds along the coast with mostly clear skies inland aside
from a few passing high clouds.

Expect cloudier skies and milder temperatures Wednesday through
Friday as the region begins to feel the influence of large
scale troughing spanning from the Gulf of Alaska into western
Canada. This will result in inland highs closer to the low to mid 70s
each day through the end of the work week. Meanwhile, a series
of weak fronts will bring chances for light rain to the area
Wednesday and Thursday. The first of these fronts will approach
the coast late Tuesday night into Wednesday. Expect inland locations
to remain dry through Wednesday as any rain associated with this
feature remains confined to the coast. Model QPF amounts remain
minimal, with most coastal locations expected to pick up no more
than a few hundredths of an inch at best. The second weak front
will cross the area Wednesday night into Thursday, bringing a
better chance for light rain to southwest Washington and at
least northern parts of the Willamette Valley. That said, still
only expect a trace to a few hundredths in these locations as
models keep the chance to receive a tenth of an inch below 10%
inland and only around 10-15% along the coast through Thursday
evening. Areas from Salem south look more likely than not to
remain completely dry through Thursday. Then expect dry
conditions area wide on Friday in the wake of the second front.
Onshore flow will maintain breezy conditions through the
Columbia River Gorge through the period, with west winds
gusting as high as 25-30 mph in the central Gorge each
afternoon.

Medium range models and their ensembles continue to depict a
warming trend this weekend into early next week as upper level
ridging develops over the western CONUS. Forecast highs jump
back up into the mid to upper 80s in the inland valleys by
Sunday, with the NBM showing a 10-30% chance to reach 90 degrees
in the Willamette Valley and Portland/Vancouver metro on Sunday,
except a 30-50% chance in the central Willamette Valley.
Probabilities for highs of 90 degrees of warmer peak on Monday at
45-75% across the Willamette Valley and Portland/Vancouver metro.
While it will be trending hotter, extreme heat with highs in the
upper 90s or low 100s is very unlikely to occur at this time (1-10%
chance in the Willamette Valley). -TK/CB

&&

.AVIATION...Currently as of 2 PM, VFR conditions inland and
persistent IFR stratus along the coast. Expect these deteriorated
conditions to continue through the TAF period, potentially
lowering to LIFR overnight, mostly for KONP. Specifically, KONP
has a 20-30% chance of LIFR between 03-15Z Wednesday, while KAST
only has a 10% chance between 03-10Z Wednesday. Inland could see
some MVFR stratus overnight as onshore flow continues. Around
10-12Z Wednesday, chances for MVFR CIGs increase to 20-30% for
most inland terminals. There is low to moderate confidence that
stratus will push up the Columbia River to KPDX and through the
coastal gaps into KEUG, then gradually try to fill in the
Willamette Valley. If stratus does fill in, expect it to scatter
out by 18-20Z Wednesday. Otherwise, expect westerly to
northwesterly winds less than 10 kt through the TAF period.

PDX AND APPROACHES...VFR with high clouds and northwesterly winds
around 5-7 kt. There is a 10-30% chance of MVFR conditions after
10Z Wednesday as onshore flow pushes stratus inland.
~Hall

&&

.MARINE...High pressure will maintain northerly to northwesterly
winds across the waters today. Wednesday to Friday, a few weak
fronts will move through and turn winds more westerly to
southwesterly. Minimal impacts are expected as sustained winds are
forecast between 5-15 kt through the rest of the week. Expect
wave heights of 4-5 ft around 9-11 seconds through the end of the
week with a westerly swell. High pressure strengthens late this
weekend, returning breezy northerly winds. Guidance suggests a
60-80% chance of northerly wind gusts reaching Small Craft
Advisory levels (>21 kt) on Sunday.

A Small Craft Advisory has been issued to go in effect from 0200
to 0800 Wednesday for the Columbia River Bar due to a very strong
ebb current bringing seas up to 7 ft.
~Hall/Alviz

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...None.
WA...None.
PZ...Small Craft Advisory from 2 AM to 8 AM PDT Wednesday for PZZ210.

&&

$$

www.weather.gov/portland

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