592
FXUS66 KPQR 291735
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
935 AM PST Sat Nov 29 2025

.SYNOPSIS...Seasonable temperatures with mostly dry conditions
through the weekend and into next week, although periods of
light showers will be possible this evening and again Monday
night into Tuesday. Breezy east winds this morning decrease by
this afternoon. Near to below freezing temperatures likely early
Monday with lows ranging from the upper 20s to mid 30s.
Increasing chances for rain late next week.

&&

.SHORT TERM...Now through Monday Night...Not much change to the
forecast as models remain in good agreement with the overall
pattern. A weak shortwave trough will drop south out of British
Columbia into Washington later this afternoon while a very weak
area of surface low pressure moves toward the northern Oregon
coast this evening. This weak disturbance will bring increasing
mid to high level clouds today, along with 20-40% chances for
some very light rain showers or sprinkles this evening. Best
chances are for the coast and Cascades. Light snow will be
possible for elevations above 3000 ft in the south Washington
Cascades and to around 3500-4500 ft in the north Oregon
Cascades. Otherwise, expect mostly dry conditions during the day
time hours Saturday. Breezy east winds this morning expected to
decrease by this afternoon. Strongest winds expected near the
Columbia River Gorge with gusts up to 35 mph.

A ridge of high pressure builds over the region on Sunday, with
lighter offshore flow redeveloping. Dry conditions again expected.
Clearing skies Sunday night will likely bring cooler temperatures
for early Monday. Low temperatures are likely to fall into the upper
20s to lower 30s, with the coldest temps within the typical rural
valleys. Afternoon temps return to seasonal normals. Upper level
ridging shifts eastward as another shortwave trough digs toward the
Pacific NW later Monday. This will bring another round of light
precipitation Monday night into Tuesday.  /DH

.LONG TERM...Tuesday through Friday...Light showers linger into
Tuesday afternoon as the upper trough digs farther south into the
Great Basin. Then, dry conditions expected on Wednesday as high
pressure nudges back over the region. 500 mb cluster analysis shows
fairly good agreement with this pattern. Later next week, models and
their ensembles show the a flatter ridge, which would allow for
systems to the north to push some precipitation down into NW Oregon
later Thursday through Friday. Snow levels are expected to remain
elevated. Low chances for any impactful weather through the next
week.  /DH

&&

.AVIATION...VFR conditions expected through at least 00z Sun as
dry conditions continue. A weak front dropping across the region
will bring enhanced cloud cover and increasing chances for rain
showers and lowered cigs after 00z Sat. Portland-area terminals
will be the most likely to see persistent VFR conditions, however
there are 30-50% chances of MVFR cigs and less than a 10% chance
of IFR cigs. South along the Willamette Valley as well as along
the coast, MVFR cigs will be favored (60-80% chance of cigs below
3 kft) but there are significant chances (30-50%) for IFR cigs
during the frontal passage. Any rain showers associated with the
front are expected to remain light and may only briefly restrict
vis at area terminals.

Winds look to remain light and variable today at sites across the
region, aside from increased easterly flow to the west of terrain
gaps. KTTD will continue to see gusty east winds through the
Columbia Gorge, while other Portland-area terminals see lighter
east winds. Renewed offshore flow turning northerly in the
Willamette Valley is expected by 09-12z Sun.

KPDX AND APPROACHES...VFR conditions favored to prevail through
the period, however chances for MVFR cigs increase from 00-09z Sat
as a weak front drops across the region. While cigs will most
likely remain near 4 kft, there are 20-40% chances for MVFR cigs
instead during much of the overnight period. Any rain showers
should remain light, with brief vis restrictions possible but
prolonged impacts unlikely. East flow at less than 10 kt will
continue through the period at KPDX, with stronger flow at 15 kt
gusting to 25 kt to the east near KTTD. -36

&&

.MARINE...Fairly benign weather across the coastal waters as
light offshore flow this morning turns back onshore later today.
Winds generally remain 10 kt or less, although areas
immediately downwind of gaps in the coastal terrain may see
locally strong wind gusts up to 20 kt this morning. A very weak
low drops south over the waters tonight, followed by high
pressure building offshore through Sunday. Expect northerly flow
late Sunday into early next week. Another weak front moves
across the waters early Tuesday. Seas around 4 to 7 ft continue
through the weekend. A long period westerly swell arrives late
Monday into Tuesday, pushing seas toward 10 ft. Seas expected to
subside again by Wednesday. /DH

&&

.BEACH HAZARDS...A long-period westerly swell is expected along
the northwestern Oregon and southwestern Washington coasts from
late Monday through Wednesday next week. Wave heights
increasing to 8 to 10 ft on Tuesday may not appear to present a
safety risk to those on area beaches, but these energetic waves
will present a moderate to high risk for sneaker waves, waves
which can run significantly farther up a beach than normal,
including over rocks and jetties. In addition, a period of
perigean spring or "king" tides means these waves will have an
even easier time reaching high up onto beaches, limiting the
areas which may be safe from wave action.

A Beach Hazards Statement has therefore been issued from 7 AM
Tuesday to 10 PM Wednesday. Sneaker waves can create potentially
life-threatening conditions in the surf zone when beachgoers can
be unexpectedly knocked off their feet and pulled out into cold
ocean waters. Caution should be used when in or near the water,
and those with children should be especially watchful. Never turn
your back on the ocean, and be sure to keep an eye on the waves.
Those participating in razor clam digs should additionally
exercise caution. -36

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...None.
WA...None.
PZ...None.

&&

$$

www.weather.gov/portland

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