439
FXUS66 KPQR 091755 AAA
AFDPQR

Area Forecast Discussion...UPDATED
National Weather Service Portland OR
1055 AM PDT Sun Aug 9 2026

Updated Aviation Discussion...

.SYNOPSIS...Warm and dry conditions continue through the upcoming
week as temperatures gradually moderate towards August normals.
Renewed onshore flow will keep smoke east of the Cascades,
while precipitation chances remain very low through at least the
middle of next week. Temperatures may trend warmer later next week.

&&

.DISCUSSION...Today through Saturday...After 5 consecutive days of
90 degree weather, expect temperatures to cool about 4-7 degrees as
near average conditions are expected today with highs reaching into
the lower to mid-80s. The synoptic flow aloft becomes predominately
zonal over the region today into early next week. An embedded
shortwave trough will usher in another round of enhanced onshore
flow later this afternoon, with breezy northwest winds continuing
through this evening. Sunny skies expected inland while marine
stratus ebbs and flows near the coast. This pattern generally
remains in place through Tuesday.

By Wednesday, ensembles are showing a general trend toward upper
level troughing dropping out of British Columbia, though chances for
rain here remain very low (below 5%). This could bring in some
cooler temperatures by mid-week, as indicated by growing uncertainty
in the potential high temperatures into late next week. For example,
the spread between the 10th and 90th percentiles on Friday at PDX
range between 81 and 96 degrees. That is because ensembles are split
between upper level ridging possibly developing offshore, while
others show some sort of troughing persisting over the area. /DH

&&

.AVIATION...Through 18Z Mon...Westerly flow aloft continues today
with VFR conditions and mostly clear skies expected through the
period for inland terminals. The only exception is between 11-18Z
Mon for KPDX, KHIO, and KTTD, with guidance suggesting a 20-30%
chance of marine stratus pushing up the Columbia River and
bringing MVFR CIGs. Shallow marine stratus has mostly cleared
along the coast this morning, with just some lingering stratus
over the mouth of the Columbia River keeping KAST under MVFR CIGs.
While it looks like stratus will clear from KAST by 19Z Sun
according to satellite, there remains some uncertainty as
probabilistic guidance suggests only a 30-50% chance of VFR CIGs
this afternoon. Chances for marine stratus redeveloping at the
coast increase again by 03-06Z Mon, with chances around 70-90% for
MVFR, 30-50% for IFR, and 10-20% for LIFR between 06-18Z Mon.
Otherwise, north to northwest winds increase again this afternoon
with gusts up to 25 kt along the coast and up to 20 kt inland.

KPDX AND APPROACHES...VFR through the TAF period with clear
skies. There is a 20-30% chance for stratus to develop in the
Portland Metro between 11-18Z Mon. Northwest winds increase to
around 10-12 kt in the afternoon with gusts up to 20 kt.
~12

&&

.MARINE...High pressure offshore will maintain northerly winds
through much of next week. Surface pressure gradients tighten
this afternoon, bringing high chances for wind gusts up to 25 kt
south of Cape Foulweather today and into early next week. As a
result, a Small Craft Advisory has been issued for the inner and
outer waters south of Cape Foulweather from 12 PM Sunday to 2 AM
Monday. Similar small craft conditions may reoccur Monday for the
waters south of Cape Foulweather. Wind driven seas are expected to
remain around 4 to 6 ft through most of next week. /DH

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...None.
WA...None.
PZ...Small Craft Advisory until 2 AM PDT Monday for PZZ253-273.

&&

$$

www.weather.gov/portland

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