Eugene, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

089
FXUS66 KPQR 040452
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
952 PM PDT Tue Jun 3 2025

.UPDATED AVIATION DISCUSSION...

&&

.SYNOPSIS...This week, the Pacific Northwest (PacNW) will be
under a northwest flow pattern, caught between a ridge of high
pressure over the northeast Pacific and a trough over the Great
Basin. Expect mostly dry weather and slightly above normal
temperatures. As we head toward the weekend, temperatures will
climb, with Sunday likely bringing the warmest conditions of the
year so far.

&&

.DISCUSSION...Now through Sunday...High pressure continues throughout
the next few days, allowing for increasingly warm temperatures from
Thursday onwards. Before then, cooler air being brought in from the
northwest allows temperatures to stay relatively seasonable,
bottoming out on Wednesday. On Wednesday afternoon, high temperatures
will be right around 70 in the Willamette Valley and closer to the
low 60s at the coast. On Thursday, ridging begins to fully start
building in, and inland temperatures show a 60-80% chance of
exceeding 80 degrees.

From Thursday onwards, each afternoon climbs in temperature as upper
air temps increase. Current models have temperatures peaking on
Sunday afternoon, whenthere is a 50-80% chance of temperatures in
the Willamette Valley exceeding 90 degrees. Temperatures in the
Portland metro area will be a few degrees warmer than the rest of the
Willamette Valley due to urban heat island effect. That said, there
remains some degree of uncertainty regarding Sunday`s temperatures.
A cooler scenario (NBM 10th percentile) shows inland temps in the mid
to upper 80s, in the case that winds remain northwesterly during that
time. In a warmer scenario (NBM 90th percentile), where winds shift
northeasterly, bringing in inland warm air, temperatures push up to
100 degrees in the Willamette Valley, closer to 75-80 at the coast.
In any case, there continues to be potential for a significant heat
event with Major Heat Risk over this coming weekend. Throughout this
period, winds peak in the afternoon with gusts up to 15-20 mph at
times. /JLiu


&&

.AVIATION...Broken marine stratus over the coastal waters has
quickly evolved into a solid low overcast deck this evening
bringing a mix of MVFR to IFR CIGs to coastal terminals. This
marine layer will then deepen the rest of tonight, promoting
patchy light drizzle along the north coast by 08-10z Wed. This is
also when MVFR cigs should lower to mainly IFR at the coast, and
roughly when MVFR cigs should develop over all inland terminals.
Given a very weak weather disturbance moving overhead can`t rule
out occasional drizzle/mist at Portland/Vancouver area terminals
Wednesday morning as well - lower chances central and southern
Willamette Valley. Low clouds will then remain in place through
20-23z Wed before scattering out and lifting thereafter, although
confidence in the exact timing of the MVFR to VFR switch is low
at this time as some guidance pushes this transition later into
the afternoon (after 00z Thur).

PDX AND APPROACHES...Clear skies will give way to low clouds with
MVFR cigs by 08-09z Wed after which point expect occasional
mist/drizzle through the morning hours. This cloud deck should
gradually clear in the afternoon hours with higher confidence in
VFR CIGs/VIS after 23z Wed-02z Thur. Winds generally stay less
than 5-10 knots. -Schuldt

&&

.MARINE...Not much change as a summer time pattern has settled
in with high pressure persisting offshore through the week,
resulting in persistent northerly winds. Northerly winds will be
strongest during the afternoon and evening hours each day this
week, especially over the central and southern waters where
small craft advisory level wind gusts up to 25 kt are likely to
occur each day from Tuesday through Sunday.

The general sea state will continued to be dominated by northerly
wind waves and a fresh northwesterly swell through Sunday with
significant wave heights around 6 to 8 ft and a dominant wave
period around 8 to 9 seconds. Expect seas to remain steep and
choppy during the afternoon and evening hours when winds are
strongest. -TK

&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
PZ...Small Craft Advisory until midnight PDT tonight for PZZ272-273.
&&

$$

www.weather.gov/portland

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