367
FXUS66 KPQR 291114
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
315 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...Today 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...Increasing northwest flow aloft today with mid to high
level clouds streaming across the area. Predominately VFR
conditions are expected through at least 00z Sunday. As of 09z
Saturday, satellite imagery does show a small area of low clouds
just east of KEUG along the I-5 corridor. There is a small (10%)
chance these clouds impact KEUG or KSLE early this morning as
breaks remain in the high clouds over the southern Willamette
Valley.

Offshore flow in the lower levels this morning will maintain dry
conditions with strongest east winds near the Columbia Gorge with
gusts up to 25-30 kt near KTTD. East winds will also impact KPDX
and KHIO, albeit weaker with gusts up to 15-20 kt. Expect winds to
gradually decrease through this afternoon.

A weak front then drops south across the area this evening,
bringing light rain or sprinkles, and increasing chances for MVFR
CIGs. Chances for MVFR increase at KAST after 00z Sunday to
around 30-50%, and after 03z Sunday at most inland terminals.

KPDX AND APPROACHES...VFR expected through at least 00-03z Sunday
with increasing mid to high level clouds today. Chances for MVFR
CIGs below 3000 ft increase to around 30-40% after 03z Sunday.
There is also a 20% chance for light rain between 00-06z Sunday.
East winds around 8 to 12 kt with gusts up to 15-20 kt continue
through this morning, weakening by this afternoon. /DH

&&

.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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