687
FXUS66 KPQR 240455
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
955 PM PDT Mon Jun 23 2025

Updated aviation discussion.

&&

.SYNOPSIS...Warm and dry conditions will continue through
Tuesday. Cooler Wednesday through Friday as a broad upper level
trough settles over the area. This trough will also bring a
chance of light rain on Wednesday and Thursday, mainly to the
north of Salem. Dry next weekend with warming temperatures.

&&

.DISCUSSION...Now through Sunday night...There are no signs of any
high impact weather on the way through the upcoming weekend. Instead,
the forecast is fairly seasonable this week with persistent onshore
flow in place. Will note skies are currently hazy across the area due
to wildfire smoke in upper levels of the atmosphere, coming mainly
from wildfires burning in British Columbia. Fortunately, air quality
remains good over the region as this smoke is not mixing down to the
surface. In addition, upper level flow will transition from northerly
to westerly tomorrow, which will help push any lingering haze east of
the Cascade crest. Aside from that, expect fairly typical weather for
late June through Tuesday with high temperatures in the upper 70s to
lower 80s over the lowlands, except 60s at the coast.

Conditions become cooler and cloudier Wednesday through Friday as a
broad upper level trough settles over the area and low-level onshore
flow continues. This trough will also bring two chances for light
rain showers across southwest WA, the Oregon coast/coastal mountains,
northern Willamette Valley, Portland/Vancouver metro and Columbia
River Gorge. The central and southern Willamette Valley will most
likely stay dry, as well as the Lane and Linn County Cascades. The
first chance of rain arrives Tuesday night/Wednesday morning, while
the second chance arrives Wednesday night/Thursday morning. Locations
that do observe rain should expect anywhere from a trace to 0.05
inches of rain from each round. The wettest model guidance suggests
around 0.10-0.15 inches of rain, however the probability for rain
amounts this high to occur is at 5-10% or less. Either way, this is
nowhere near the amount of rain that was observed across all of
northwest OR and southwest WA on June 20-21.

Conditions are trending dry on Friday and slightly warmer, but only
by a few degrees. Widespread highs in the 70s are expected, except
60s at the coast. Overall, Friday looks to be an ideal day for
outdoor activities. If you prefer outdoor activities in hotter
temperatures, hold off until next weekend. Models and their ensembles
are in better agreement now for widespread high temps in the low 80s
on Saturday and in the mid to upper 80s on Sunday. The NBM 1D Viewer
for high temperatures shows minimal model spread, suggesting
confidence is high for warmer weather next weekend. If you decide to
cool off in rivers or lakes, please keep in mind water temperatures
are still very cold. Note the coast will remain much cooler compared
to inland areas with highs in the 60s to around 70 degrees. -TK

&&

.AVIATION...VFR areawide but expecting marine stratus to return
to the coast tonight around 08-10Z Tuesday, bringing mostly
MVFR/IFR conditions (50-80% chance of IFR). The coast could see
LIFR conditions tonight, with probabilistic guidance suggesting
a 10-20% chance at KAST and a 30-50% chance at KONP. Stratus is
expected to scatter out for a brief period along the coast
around 19-22Z but may only last a few hours before stratus
reforms. Inland should remain VFR through the TAF period, but
there is a 10-20% chance of MVFR conditions forming between
11-16Z Tuesday. Light winds areawide overnight then
northwesterly along the coast tomorrow.

PDX AND APPROACHES...VFR with high clouds and light winds less
than 5 kt through the period. There is a 10-20% chance for MVFR
stratus between 11-16Z Tuesday. -Batz/Hall

&&

.MARINE...High pressure will maintain benign marine weather
conditions and northerly winds through the week. One exception
will be Wednesday through Thursday, when a weak surface front
shifts winds southwesterly. Minimal impacts expected, as
sustained winds throughout the entire week are forecast between
5-15 kt. Through the week, expect seas around 4-5 ft and
westerly swells around 9-11 seconds. ~Hall/Alviz

&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
PZ...Small Craft Advisory from 1 AM to 7 AM PDT Tuesday for PZZ210.
&&

$$

www.weather.gov/portland

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