641
FXUS66 KPQR 230530 AAB
AFDPQR

Area Forecast Discussion...UPDATED
National Weather Service Portland OR
1029 PM PDT Wed Jul 22 2026

Updated short term, marine, and aviation discussions. Updated
synopsis.

.SYNOPSIS...Scattered thunderstorms continue tonight over the central
and northern Willamette Valley and Portland/Vancouver metro area. The
main hazard with thunderstorms tonight will be frequent lightning.
Showers and thunderstorms dissipate on Thursday with relatively
cooler and drier weather. Remaining dry on Friday with temperatures
trending slightly warmer, then becoming cooler again over the weekend
with chances for light rain showers at the coast.

&&

.SHORT TERM...Now through Thursday...Scattered thunderstorms continue
tonight over the central and northern Willamette Valley and
Portland/Vancouver metro as an upper level low spins offshore over
the far northwest Pacific, bringing moist and unstable southerly flow
aloft to northwest OR and southwest WA. The main hazard with
tonight`s thunderstorms will be frequent lightning. Fortunately,
these showers and storms have brought an end to our heat spell, and
there are no longer any heat headlines in effect.

Conditions trend cooler and less active on Thursday as onshore flow
increases and lingering morning thunderstorms dissipate. However,
temperatures will still be toasty for inland areas on Thursday with
highs in the mid to upper 80s expected across the interior lowlands
and 60s along the coast. -23

.LONG TERM...Thursday Night through Wednesday...Temperatures on
Friday are expected to be similar to Thursday as the upper
level pattern remains largely unchanged. Heading into the
weekend, a pattern change is expected with a trough dropping
south from the Gulf of Alaska on Saturday. This will allow
onshore flow to re- establish itself and bring a more noticeable
cooling trend late this week, along with a return to more
marine influence and night/morning cloud cover. This will also
support a trend toward more normal temperatures in the upper 70s
to low 80s inland along with overnight lows in the 50s. There
is no notable precipitation signal outside of low potential for
light showers along the coast on Saturday. -19

&&

.AVIATION...Through 06Z Friday...Radar and satellite observations
from 05Z Thursday showed scattered thunderstorms continuing over
the central and northern Willamette Valley and Portland metro. The
main hazards with these thunderstorms are frequent lightning and
brief heavy rain. Ceilings with these thunderstorms have remained
VFR given the elevated nature of the storms. Outflow winds have
been weak with most of these storms, with gusts generally staying
below 20 kt.

Thunderstorms are expected to become more isolated in coverage
after 06Z Thursday. However, there is a 30% chance for
thunderstorms between 06-10Z Thursday at KUAO, KPDX, KTTD, and
KHIO and between 06-08Z Thursday at KSLE. Although conditions will
likely remain VFR even with thunderstorms, frequent lightning will
remain a hazard. Thunderstorms have ended at the coast, however a
stray shower or storm cannot be completely ruled out from KONP to
KAST (15% chance). After 12-14Z Thursday, the thunderstorm threat
shifts into southwest WA and diminishes by 18Z Thursday.

In addition to the thunderstorms, MVFR ceilings are expected to
develop at all inland terminals by approximately 10-12Z Thursday
before scattering out and lifting to VFR after 18-19Z Thursday.
Meanwhile, LIFR to IFR ceilings are expected at the coast through
Thursday morning before lifting to VFR sometime in the afternoon.

KPDX AND APPROACHES...There is a 30% chance of thunderstorms
between 06-10Z Thursday, decreasing to a 15-20% chance between
10-14Z Thursday and below 10% after 14Z. The main hazard with any
thunderstorm that does develop will be frequent lightning. VFR
ceilings are expected to persist through approximately 10-12Z
Thursday before lowering to MVFR. MVFR ceilings should scatter out
and lift to VFR after 18-19Z Thursday. Northwest winds develop
towards 01-02Z Friday with an incoming sea breeze, sustained
between 7-10 kt. -23

&&

.MARINE...Buoy observations from late Wednesday evening showed
southerly winds occurring over the coastal waters around 10-15 kt.
Gusts up to around 20 kt were occurring at buoy 029. Seas were
around 6 ft at 8 to 10 seconds. Expect south winds to continue
through Thursday, albeit weakening significantly in the afternoon
and evening to below 5-10 kt. Meanwhile, seas are expected to hold
steady with minimal change.

Seas decrease to 4 to 5 ft on Friday with light southwest winds in
place, resulting in benign conditions. Seas then increase to 6 to
7 ft on Saturday as southerly winds ramp up with the passage of a
cold front. This front will bring wind gusts upwards of 20-25 kt
and chances for rain showers. Given the increase in winds and
seas, conditions are expected to become hazardous to small craft.
Winds and seas then decrease on Sunday in the wake of the cold
front. -23

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...None.
WA...None.
PZ...None.

&&

$$

www.weather.gov/portland

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