376
FXUS66 KPQR 281710 AAA
AFDPQR

Area Forecast Discussion...UPDATED
National Weather Service Portland OR
1009 AM PDT Sat Jun 28 2025

...Updated aviation discussion...

.SYNOPSIS...
A warm and dry weekend is taking shape, with temperatures
climbing steadily into early next week. The hottest day is
expected to be Monday, when many spots across the interior
valley could reach the low 90s. After that, temperatures cool a
bit but remain on the warmer side. We are also watching for a
slight chance of thunderstorms over the Oregon Cascades Monday
and Tuesday.

&&

.DISCUSSION...Now through Friday...Temperatures start to climb
today as high pressure strengthens overhead. Skies will clear up
more compared to recent days, especially in the afternoon,
allowing for warmer air to build in. Inland can expect highs in
the upper 70s to low 80s today, with Sunday running much warmer.
By Sunday afternoon, there is a 30-50% chance that the interior
valleys will reach 90 degrees. Cooler air near the surface and
a bit of onshore breeze might keep some spots slightly cooler,
particularly along the coast or in more elevated terrain. The
warming trend continues into Sunday night as offshore flow
strengthens, setting the stage for Mondays heat.

Monday looks to be the peak of the heat, with widespread highs
in the low 90s expected across the inland valleys. Even coastal
area will feel warmer than normal, though still mild compared to
inland spots. This heat may be uncomfortable to some, especially
for those without access to cooling. There is also a 15-30%
chance of isolated thunderstorms over the Oregon Cascades Monday
afternoon and evening, especially from Lane County southward. A
weak system off the California coast is helping to draw
moisture into the mid-levels, which could support storm
development in terrain-favored areas. Ensemble guidance supports
modest instability, particularly in the central Oregon Cascades.
If that moisture tracks farther north, there could be some
activity closer to Mount Hood, but confidence is lower for that
scenario. By Tuesday, thunderstorms chances remain, but activity
looks less widespread and less organized.

After Monday, temperatures dip slightly but stay above average.
Highs for the middle of next week will likely hover in the low
to mid 80s for much of the Willamette Valley, while overnight
lows will stay mild, mainly in the 50s. Ensemble clusters
generally agree on maintaining a warmer-than-normal pattern into
late week, though any significant cooling appears unlikely
through at least Friday.     ~Hall

&&

.AVIATION...Satellite imagery as of mid-morning Saturday shows
lingering stratus along the north Oregon coast and parts of the
eastern Portland Metro Area. As daytime heating progresses, expect
these low clouds to scatter out with conditions improving to VFR by
19-20z Sat. High pressure will maintain predominately VFR conditions
with mostly clear skies through the TAF period. A 15-30% chance of
IFR/MVFR stratus returns tonight, mainly after 06-08z Sun along the
coast and between 12-16z Sun across the Willamette Valley (highest
chances in the eastern Portland Metro).
Northerly to northwesterly winds generally 5-10 kt today with gusts
up to 20 kt inland and up to 25 kt along the coast.

PDX AND APPROACHES...VFR through the TAF period with mostly clear
skies. Northwesterly winds 5-10 kt with gusts up to 20 kt this
afternoon/evening.       -Alviz

&&

.MARINE...Onshore flow persists with little change in the
forecast. Today, conditions will begin to shift as a ridge of
high pressure slowly builds over the Pacific and a low over the
Great Basin shifts north and east. The combination of these two
features will result in robust northerly winds across all waters.
This typical summertime pattern will bring winds to 15-20 kt with
gusts up to 25 kt through all of the waters spreading from south
to north. Northerly winds expected to increase for zones PZZ273,
PZZ2513, PZZ272 and PZZ252 on Sunday with gusts up to 30 kt.
As a result have maintained the current suite of Small Craft
Advisories as well as extended the duration.

On Sunday through Tuesday temperatures will rise considerably and
a thermal trough forms which will maintain northerly winds across
all waters. This will likely result in Small Craft Conditions
persisting through the start of the upcoming week.

Seas will be predominately west-northwest with a northerly wind
waves. At this time, the wind wave will be the dominate feature.
However, conditions will see little change as overall they will
not rise considerably. Looking at seas of 5-6 ft at 9 seconds
today building to 7-9 ft at 9 seconds Sunday and Monday. Seas and
winds are expected to slowly subside by midweek as the ridge
decays.    /42

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...None.
WA...None.
PZ...Small Craft Advisory from 8 AM Sunday to 5 AM PDT Monday for
     PZZ251-271.

     Small Craft Advisory from 8 PM this evening to 5 AM PDT Monday
     for PZZ252-272.

     Small Craft Advisory from 2 PM this afternoon to 5 AM PDT Monday
     for PZZ253-273.
&&

$$

www.weather.gov/portland

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