Aloha, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

907
FXUS66 KPQR 241238
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
438 AM PST Sat Jan 24 2026

.SYNOPSIS...Dry weather continues through the weekend as high
pressure remains over the region. Gusty winds persist through
the Columbia Gorge. Expect cold overnight lows in the low to
mid 20s through Saturday night/Sunday morning in the lowlands.
Clear skies and light winds away from the Columbia River Gorge
will result in frost formation for the interior lowland valleys
and coast range Valleys. Chances for precipitation return by the
middle of next week, but details on the exact timing and impacts
remain uncertain at this time.

&&

.SHORT TERM...Now through Sunday Night...Fairly benign weather
across the PacNW as high pressure continues to dominate the
Pacific NW and NE Pacific Ocean. Clear skies have allowed for
efficient cooling across the region, leading to cold overnight
conditions. Current temperatures are generally in the mid to
upper 20s west of the Cascades. Northerly winds around 5 to 10
mph are helping drop the apparent temperature (feels like) into
the upper teens to low 20s for many locations. A Cold Weather
Advisory remains in effect until noon today for areas west of
the Cascades, including the Coast and the Columbia River Gorge
and Upper Hood River. Conditions will also be cold in the
Cascades but Cold Weather Advisory criteria is colder than
lower elevations and is not expected to be met.

Cold overnight to morning temperatures will continue through
Monday morning, though the chances for meeting Cold Weather
Advisory criteria decreases each night. Tonight looks decent for
another night hitting advisory criteria but conditions won`t be
as widespread as the previous night. Probabilities for
temperatures to drop to or below 25 degrees are highest in the
southern Willamette Valley at 70-90% while the northern
Willamette Valley is only 40-50%. The Portland/Vancouver metro
is even lower at 20-30% except for the more rural locations that
range from 60-80%. Sunday night into Monday morning looks
unfavorable for advisory criteria cold as cloud cover increases
and winds decrease leading to only a 10-20% chance of reaching
25 degrees in the southern Willamette Valley, Clark county
lowlands, and the Coast Range valleys.

Transport winds have increased and as a result have helped to
mix the air trapped at or near the surface. Therefore, have
expired the Air Stagnation Advisory. However, transport winds do
decrease towards the latter part of this weekend and into the
start of next week. So, another Air Stagnation Advisory may be
warranted, mainly for the Willamette Valley depending on how
long conditions are expected to persist. -19

.LONG TERM...Monday through Friday...Models and their
associated ensembles are starting to show a pattern shift next
week as a trough digs across the Pacific. This may weaken the
anchored ridge enough to finally see a substantial change by the
middle/end of the upcoming week. Ensembles agree that a weak
short wave and associated cold front will pass through the
region during the Sunday night through Monday night timeframe.
However, precipitation is negligible (if any) for the area with
at most a few hundredths of an inch. Even if this system brings
little in the form of precipitation, it will still play an
important role in breaking the ridge down and setting the stage
for more beneficial precipitation toward the middle/end of next
week. Ensemble guidance remains in agreement that a moderate,
Pacific low will finally break down the strong ridging over the
region by midweek, though details are still unclear. At this
time, model ensemble guidance is pointing towards a moderate PoP
(35-60% chance) with relatively low/moderate QPF (0.10-0.50
inches total) event. At this point, there are no major impacts
expected with this weather system, and if precipitation does
occur, it would be more beneficial than impactful, especially
after the recent dry spell. /42/19

&&

.AVIATION...Clear skies continue across the region as high
pressure builds overhead. Temperatures are below freezing for
most of the area with frost formation possible on surfaces
where winds are light. Northerly winds 5-10 kts expected through
the Willamette Valley with offshore winds on the west side of
the Cascades and Coast Range 10-15 kt with gusts to around 20
kts in the morning. Gusty winds through the Gorge are expected
to impact KTTD during the morning with gusts around 25 kt.
Expecting the offshore pressure gradient to decrease through
the day which will ease the easterly winds. Expect another cold
night tonight with frost development.

KPDX AND APPROACHES...VFR conditions expected through the
period. Temperatures will drop near freezing with frost
possible in some shaded areas but in general winds will be
elevated enough to keep it at bay. Winds aloft below 5000 ft
will remain at 20-25 kt through 20Z Saturday. -19/27

&&

.MARINE...Expect fairly benign conditions, especially by
January standards, to continue across the coastal waters the
next several days. Easterly to northeasterly winds continue as
the thermal trough remains over the area. Winds slowly decrease
through the weekend followed by a switch to southerly winds on
Monday as a weak weather disturbance passes by primarily to our
north. Through early next week wave heights hold between 3-6ft.
Our next frontal system of note likely approaches the waters by
the middle of next week increasing chances for Small Craft
Advisory conditions, particularly on Wednesday. Given the
uncertainty in the track and strength of this disturbance,
confidence decreases in the wave height forecast mid-week onward
but the GEFS does indicate a 20-30% chance for wave heights to
exceed 15 ft as early as Wednesday evening. -99/19

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...Cold Weather Advisory until noon PST today for ORZ101>125.

WA...Cold Weather Advisory until noon PST today for WAZ201>210.

PZ...None.

&&

$$

www.weather.gov/portland

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