700
FXUS66 KPQR 072211
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
311 PM PDT Sat Jun 7 2025


.SYNOPSIS...High pressure over the region will lead to hot
temperatures for inland areas while the coast remains cool through
Monday before increasing onshore flow brings a gradual return
to more average temperatures for inland locations next week.


&&


.SHORT TERM...Now through Monday Night...Water vapor satellite
imagery this afternoon reveals high pressure centered over the
eastern Pacific off the northern California and Oregon coast.
Ensemble guidance is in good agreement it will shift over the
Pacific Northwest over the next 12-36 hours before sliding over
the Rockies early next week. This will lead to a dramatic
warmup with temperatures rising well into the 90s for most
locations in the Willamette Valley, Cascade Foothill valleys and
the Columbia River Gorge for Sunday and Monday.

Ensemble guidance is in relatively good agreement on
temperatures. For example, the NBM suggests there is an 80%
chance that temperatures end up between 93-99F at KPDX on Sunday
and 90-94F for KEUG for Monday with only a slight deviation
from those numbers on the opposite days at both sites. Daily
record high temperatures are in jeopardy at a few sites as a
result. Low temperatures will generally fall into the upper 50s
to low 60s at most locations, which will help to keep impacts
more limited. However, the Portland/Vancouver metro and those
living on some of the higher hills of the region will be more
susceptible to low temperatures dipping only into the mid 60s,
and thus result in these locations falling into the major heat
risk category with heat impacts likely greater for those without
access to air conditioning.


.LONG TERM...Tuesday through Saturday...The global ensembles are
in good agreement that large scale ridging will give way to a
low amplitude large scale shortwave trough moving over the
Pacific Northwest. This will lead to increasing onshore flow
Tuesday through the end of the week and result in temperatures
cooling back down to near average for early-mid June levels.


&&


.AVIATION...Visible satellite shows clear skies across NW OR and
SW WA as of 21z Sat. A narrowing band of marine stratus hugging
the coastline is producing intermittent LIFR conditions at KONP
as the low stratus deck moves in and out of the terminal.
Otherwise, VFR conditions prevail as high pressure continues to
build over the region. Stratus will become more firmly re-
established at the coastal terminals along with IFR/LIFR cigs by
02-05z Sun, persisting through around 18z Sun. Do not anticipate
much of an inland stratus push tonight as light offshore flow
develops in the mid levels and increasing subsidence limits the
depth of the marine layer. Expect VFR conditions through the
period for the inland terminals, with winds generally remaining
under 8 kts.

PDX AND APPROACHES...VFR under clear skies through the period. WNW
winds around 5 kt. /CB


&&


.MARINE...Surface high pressure centered well offshore maintains
light to moderate northerly breezes of 10-15 kt across the coastal
waters this afternoon, with buoys reporting seas of 5-7 ft driven
primarily by a mid period northwest swell. Expect these conditions
to persist over the waters through Sunday. Northerlies begin to
strengthen a bit by Monday as the pressure gradient tightens early
next week, but the position of the surface low will generally
keep the core of strongest winds farther offshore and to the north
towards Vancouver Island. Still, guidance suggests at least the
outer zones will likely see some 20-25 kt wind gusts by Monday.
Seas will will also begin to trend upward early in the coming week
as the northwest swell builds to 8 to 10 ft, likely necessitating
the next round of small craft headlines at least for the outer
zones if not for the nearshore waters by late Sunday into Monday.
/CB


&&


.CLIMATE...
Daily record high temperatures:

Sunday, June 8

Portland94 (1955)
Salem98 (1955)
Eugene93 (2015)
Astoria97 (1903)

Monday, June 9

Portland95 (1955)
Salem96 (1955)
Eugene91 (2015)
Astoria87 (1924)


.PQR WATCHES/WARNINGS/ADVISORIES...

OR...Heat Advisory from 10 AM Sunday to 10 PM PDT Monday for
     ORZ108>123.

WA...Heat Advisory from 10 AM Sunday to 10 PM PDT Monday for
     WAZ204>207-209-210.

PZ...None.


&&


$$

www.weather.gov/portland

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