581
FXUS66 KPQR 120359 AAA
AFDPQR

Area Forecast Discussion...UPDATED
National Weather Service Portland OR
859 PM PDT Wed Jun 11 2025

...Updated aviation discussion...

.SYNOPSIS...Onshore flow and dry/mostly dry conditions continue
through the weekend as temperatures return to seasonable norms.
Our next chance (20-45%) for widespread light rain arrives early
next week although amounts appear fairly light, generally less
than 0.10-0.25".

&&

.SHORT TERM...Now through Friday Night...Broad onshore flow
continues today with weak upper-level troughing slated to
develop late in the week. This will continue our gradual cooling
trend the rest of the workweek with high temperatures finally
bottoming out on Friday in the low 70s across the interior
valleys. It`s worth highlighting Thursday and Friday will
finally bring us back down to "normal" June temperatures, highs have
been running on average almost 10 degrees above normal so far
this month, values much more akin to July.

Meanwhile at the coast, persistent marine influence will see
fairly steady highs in the upper 50s and low 60s. Across the
region, overnight lows in the 40s to low 50s will also trend
downward slightly. We`ll have to keep an eye on weak upper-level
shortwave arriving from the west, most notably Thursday night
into Friday morning, bringing low chances (5-15%) of light rain
at the coast (generally less than 5% inland). Otherwise, dry
conditions are favored with enhanced cloud cover as the only
indicator of these weak shortwaves moving inland. -Schuldt

&&

.LONG TERM...Saturday through Tuesday...Long-range ensemble
guidance continues to show a fairly persistent closed upper low
near the Haida Gwaii through much of the period. As the low
weakens over the Father`s Day weekend, briefly resurgent
shortwave ridging will favor a warm-up, with temperatures in
the mid 70s to near 80 degrees across the Willamette Valley and
low to mid 60s along the coast into the beginning of next week.
A resurgent upper low could bring reinvigorated troughing into
the region Monday and Tuesday, yielding the best chances for
rainfall in some two weeks for many. Wetter solutions are
still dominated by European ensemble members, while both the
American and Canadian suites favor a drier solution, yielding
just 25-50% chances in at least 0.01" of rain across the region
Monday and Tuesday. Chances for a more beneficial wetting rain
of at least 0.10" inches are 20-40% along the coast and in the
Cascades, and only 10-25% along the Willamette Valley. -Picard

&&

.AVIATION...High pressure will maintain VFR conditions with high
clouds over Willamette Valley terminals through the TAF period. High
confidence for MVFR stratus along the coast through Thursday
morning. Marine stratus should break out by around 18-21z Thu,
improving conditions to VFR for coastal terminals. Expect west-
northwesterly winds under 10 kt across the region tonight. Northwest
winds strengthen tomorrow afternoon as pressure gradients tighten,
with gusts to 20-25 kt after 19-21z Thu along the coast and after
00z Fri across the Willamette Valley.

*Note that KTTD ASOS is currently out of commission except for
altimeter, and KVUO is only accessible by dial in.

PDX AND APPROACHES...VFR through the TAF period with high clouds.
Northwesterly winds under 10 kt through most of the TAF period,
increasing to 10-15 kt with gusts up to 25 kt after 00z Fri.
                                                  -Alviz

&&

.MARINE...Northwesterly onshore flow will continue as surface
high pressure remains centered over the northeast Pacific. Winds
generally 10-15 kt with gusts to 20 kt through Thursday. Seas are
expected to remain steep at 7 to 9 feet at 8 to 10 seconds through
Thursday morning. The Small Craft Advisory has been extended through
late Thursday morning as the steep seas persist.
Will note that they are marginal so there will be periods of time
between 2200 tonight and 1100 Thursday where those conditions are
not occurring.  A weak disturbance may also support low end Small
Craft wind gusts late Thursday evening with probs 20-50%, highest
for the southern outer waters. -Muessle/Batz

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...None.
WA...None.
PZ...Small Craft Advisory until 11 AM PDT Thursday for PZZ271>273.

&&

$$

www.weather.gov/portland

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