330
FXUS66 KPQR 032125 AAA
AFDPQR

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

.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...Northwest flow aloft persists through tomorrow night.
Broken marine stratus over the coastal waters will resolidify
this evening, bringing a return to MVFR cigs at the coast around
00-03z Wed. The marine layer will then deepen tonight, promoting
patchy light drizzle along the north coast by 09-10z Wed. This is
also when MVFR cigs should lower to IFR at the coast, and when
MVFR cigs should develop over all inland terminals. Low clouds
will then remain in place through 20z Wed before scattering out
and lifting thereafter.

PDX AND APPROACHES...Clear skies will give way to low clouds with
MVFR cigs by 10z Wed. Northwest winds around 10-13 kt with gusts
up to 18 kt will continue through approximately 03-05z Wed before
weakening thereafter. -TK

&&

.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 8 PM PDT this evening for PZZ251>253-
     271.

     Small Craft Advisory until midnight PDT tonight for PZZ272-273.
&&

$$

www.weather.gov/portland

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