708
FXUS66 KPQR 050456
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
956 PM PDT Wed Jun 4 2025

.UPDATED AVIATION DISCUSSION...

&&

SYNOPSIS...A stretch of warm, dry weather will continue across the
Pacific Northwest through early next week as high pressure remains
the dominant feature. Inland temperatures will steadily rise,
climbing into the 80s by Friday and potentially reaching the mid to
upper 90s by Sunday. Both Saturday and Sunday have a moderate Heat
Risk for interior valleys. Coastal areas will stay cooler, but may
still warm slightly over the weekend depending on wind direction.
Breezy afternoon winds each day may offer modest, localized relief
from the heat. Monday will likely stay hot as well, though forecast
confidence decreases slightly.

&&

.DISCUSSION...Now through Tuesday night...Morning inland rainfall
overperformed model output, with up to a quarter of an inch of rain
accumulation in some spots. As of 1:30pm Wed, rainfall has all but
ended, though some low marine stratus clouds remain in the area.
These continue to clear over the rest of the afternoon, with
afternoon highs Wednesday peaking around the upper 60s in the
Willamette Valley (around 60 at the coast).

Strong ridging continues through the next few days, allowing for
increasingly warm temperatures that peak on Sunday. Thursday sees
inland highs in the low 80s, increasing to mid 80s on Saturday and
upper 80s on Saturday. Sunday`s high sees a 50-80% chance of
exceeding 90 degrees, particularly in the Willamette Valley, where
urban heat island effect allows for temperatures a few degrees
warmer. That said, the chance of inland temperatures over 100 degrees
is under 5%. Overnight lows during this period will remain in the
50s, with the exception of Saturday night and Sunday night possibly
approaching 60 degrees inland. NWS HeatRisk currently showing
moderate risk throughout Saturday, Sunday, and Monday for most inland
areas. Less concern for coastal areas, where high temperatures likely
peak in the low to mid 70s.

Moving into next week, cluster guidance shows strong agreement (80%+)
agreement in ridging remaining through Tuesday night. That said,
temperatures will be coming down slightly from the peak on Sunday,
with Monday and Tuesday`s afternoon highs inland being around the
upper 80s and low 80s, respectively. On Tuesday night, early cluster
guidance shows a trend towards more zonal flow at the moment.  /JLiu


&&

.AVIATION...Late this evening satellite imagery and surface
observations depict widespread stratus and MVFR to IFR CIGs
across the coastal areas, likely (70-90%) persisting for most of
the TAF period. With the increase in low level moisture and
northwesterly flow near the surface, guidance also shows a high
degree of confidence in the return of MVFR CIGs to the Willamette
Valley and Portland/Vancouver Metro late tonight and Thursday
morning too; highest chance for MVFR CIGs between 12-18z. At least
there seems to be decent agreement at inland terminals that this
low cloud layer breaks up and dissipates around 18-21z with
prevailing VFR conditions afterward. Winds ease overnight but
increase again out of the N-NW Thursday afternoon with gusts
around 20 knots possible along the coast and in the southern
Willamette Valley.

PDX AND APPROACHES...Expect low-end VFR CIGs (4-6 kft) to persist
through the rest of the evening into the overnight hours. However
early Thursday morning more low level moisture will lead to a
75-90% chance for MVFR CIGs to return between 12-18z Thu. Any low
stratus that develops should improve back to VFR after 18-19z
Thu. -Schuldt

&&

.MARINE...Minimal changes to the forecast. Summer time pattern
has settled in with high pressure persisting offshore through
the week. This will maintain breezy northerly winds across the
waters, strongest in the afternoon and evening hours. Tonight,
the central and southern outer waters (mainly 30-60 NM out)
could see occasional northerly wind gusts up to 25 kt. However,
a Small Craft Advisory was not issued for these zones tonight
into Thursday morning as these gusts are not widespread.
Northerly wind gusts up to 25 kt do become more widespread
Thursday afternoon as pressure gradients tighten, so a Small
Craft Advisory has been issued for the central and southern
outer waters from 2 PM Thursday to 5 AM Friday.

The general sea state will continued to be dominated by northerly
wind waves and a west-northwesterly swell through Sunday with
significant wave heights around 5 to 8 ft and a dominant wave period
around 9-11 seconds. Seas will the steepest and choppiest during the
afternoon and evening hours when winds are strongest.      -Alviz/DH

&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
PZ...Small Craft Advisory until 5 AM PDT Friday for PZZ272-273.
&&

$$

www.weather.gov/portland

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