983
FXUS66 KPQR 301108
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
307 AM PST Sun Nov 30 2025

.SYNOPSIS...High pressure continues over the region today with
mostly dry conditions expected through Monday. Chilly temperatures
expected Monday morning. A weak front will bring chances for light
rain Monday night into Tuesday. Dry again on Wednesday. Active
weather returns as a series of frontal systems bring increasing
chances for rain later Thursday into Saturday. Seasonable
temperatures continue through the week.

&&

.SHORT TERM...Today through Tuesday night...Dry weather expected
this Sunday as high pressure builds over the region. Cloudy skies
this morning expected to clear from north to south this afternoon,
becoming mostly sunny with seasonably cool temperatures. Mostly
clear skies tonight into early Monday, along with light winds, will
allow for radiational cooling overnight. Expect a chilly Monday
morning with low temperatures falling into the upper 20s to lower
30s through much of the inland valleys, while the outer rural areas
have the higher probabilities of below freezing temperatures. Light
offshore flow in the Portland Metro and along the coast will likely
maintain slightly warmer temperatures, with lows in the mid to upper
30s. Dry conditions continue Monday, though as the upper ridge
shifts east, clouds fill in Monday afternoon as a shortwave trough
approaches the region. A weak frontal system moves over the area
Monday night into Tuesday bringing another round of light
precipitation. But, rainfall amounts again have been trending lower
with a few hundredths of an inch, up to a tenth of an inch, likely.
Highest accumulations expected along the northern coast and higher
terrain. No impactful weather expected. /DH

.LONG TERM...Wednesday through Saturday...Models and their ensembles
remain in good agreement that an upper level ridge rebuilds over the
eastern Pacific on Wednesday. This will maintain dry conditions
through at least Wednesday night. Then, precipitation chances
increase late Thursday through Saturday as ensemble clusters are
indicating high chances of the ridge flattening out, allowing for
northerly weather systems to push into the Pacific NW. While this
pattern change to more wet weather appears likely, there is fairly
high confidence that rainfall amounts are not expected to be too
impactful. Snow levels are also expected to start out relatively
high around 6,000-7,000 ft before gradually falling to around 5000
ft later Saturday. Concerns for snow at pass levels remains low. /DH

&&

.AVIATION...Northerly flow aloft as an upper level ridge of high
pressure gradually builds over the region today. As of 09z Sunday,
satellite and surface observations depict overcast skies across NW
Oregon and much of SW Washington. The layer of stratus currently
reporting CIGs of around 2500-3500 ft with a mix of MVFR and low
end VFR conditions expected to continue through 17-19z this
morning. CIGs then lift with clearing skies from north to south
this afternoon, resulting in predominately VFR conditions. Expect
these conditions to persist through at least 06z Monday. Winds
remain relatively light, except at KTTD where easterly winds will
continue around 10-13 kt and at KPDX where east to east-southeast
winds around 5-7 kt continue.

KPDX AND APPROACHES...Predominately VFR conditions expected
through the period. Although, there remains a 20-30% chance for
MVFR CIGs around FL025 through 16z Sunday. Mainly scattered high
clouds expected by this afternoon. East to southeast winds around
5-7 kt expected. /02

&&

.MARINE...Benign weather continues across the coastal waters as
weak low pressure dissipates near the coast today. Light offshore
flow turns northerly as high pressure builds offshore later today
through Monday. Winds remain 15 kt or less while seas hold fairly
steady around 4 to 8 ft. A weak front will push across the waters
late Monday night into Tuesday bringing northwest winds of around
15-20 kt, while a long period westerly swell will build seas
toward 10 ft on Tuesday. Winds and seas then ease midweek with
another weather system potentially arriving late in the week.

&&

.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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