224
FXUS66 KPQR 010447 AAA
AFDPQR

Area Forecast Discussion...UPDATED
National Weather Service Portland OR
945 PM PDT Mon Jun 30 2025

Updated short term discussion, aviation discussion, and PQR
WATCHES/WARNINGS/ADVISORIES.

.SYNOPSIS...Hot weather continues today and Tuesday, with today
shaping up to be the hottest day of the week. Expect widespread
highs in the low to mid 90s across the interior valleys. A few
isolated thunderstorms are possible over the Lane County
Cascades Tuesday afternoon. Conditions cool to near to slightly
above normal for early July for midweek into the weekend.

&&

.UPDATE...Monday evening...Radar, satellite and lightning
observations from 9-9:45 PM Monday depicted a cluster of
thunderstorms moving northwestward near Willamette Pass. While these
storms are generally decaying as they approach the Cascade crest, a
few lightning strikes have been observed west of the Cascade crest
around 10-15 miles southeast and east of Oakridge. Expect weak
thunderstorms/convective debris in this area through 11pm-midnight
with minimal storm movement. Until then, ensured the forecast
mentions a chance of thunderstorms in the Lane County Cascades for
Oakridge and points southeast/east. -TK

&&

.DISCUSSION...Monday afternoon through Sunday...Observed
temperatures at 3pm Monday are in the low 90s for locations east
of the Coast Range, though marine stratus lingering right along
the coast is keeping coastal temperatures in the upper 50s to
low 60s. Inland temperatures are on track to peak in the mid-90s
late this afternoon as high pressure over the Desert Southwest
builds northwest into Oregon and Washington. Temperatures on
Tuesday are expected to be around 5 degrees lower than today,
peaking in the upper 80s to around 90 degrees. Thunderstorm
chances for the Lane County Cascades have diminished for tonight
as latest guidance keeps the main forcing and moisture south of
the county, though a few showers could still form between 5 PM
tonight through 5 AM Tuesday. Latest guidance indicates a
shortwave along the cutoff low pressure system over California
will move just north enough tomorrow afternoon to bring enough
monsoonal moisture north into central Oregon as well as
providing enough lift for a 15-25% chance of thunderstorms over
the Lane and Linn County Cascades tomorrow afternoon.

Weak troughing moving into the PacNW Tuesday night into
Wednesday pushes the high pressure back to the east, allowing
daytime temperatures to fall into the low 80s. Ensemble guidance
is in good agreement that weak longwave troughing will linger
over the region through the end of the week and into the holiday
weekend, bringing the return of onshore flow and near-seasonal
temperatures for early July. Daily normal high temperatures are
around 78-81 degrees across the Willamette Valley from July 1-6.
High temperatures are forecast around 79-82 degrees across the
Willamette Valley Wednesday through Sunday with little spread in
the ensemble data. With the return of onshore flow, could also
see the return of more widespread morning stratus across inland
areas, as well. -HEC

&&

.AVIATION...Satellite imagery shows a narrow strip of marine
stratus south of KTMK as of 05z Tue, bringing persistent IFR/LIFR
conditions to coastal terminals including KONP. VFR prevails
elsewhere as scattered high clouds spread over the region from the
south in the form of convective debris associated with a
dissipating area of thunderstorms over SW OR. Expect marine layer
cloudiness to spread back into northern coastal terminals through
09z, bringing IFR cigs back to KAST overnight. VFR will remain in
place through the period at the inland terminals, with NW winds
easing below 8 kt by 07-08z. Winds will increase again to 10-15 kt
with gusts to 20-25 kt 18-21z Tue.

PDX AND APPROACHES...VFR through the period with scattered high
clouds overnight. WNW around 10 kt will ease below 8 kt 07-08z,
then increase again to around 10 kt with gusts to 20 kt 18-21z
Tue. /CB

&&

.MARINE...High pressure will maintain northerly winds across the
waters through the week, breeziest today and Tuesday. Small Craft
Advisories remain in effect across all marine zones through 1700
Tuesday, with northerly winds forecast to gust up to 30 kt. An
exception is the Columbia River Bar, where the Small Craft
Advisory ends 2300 Monday due to winds easing below 20 kt. The
strongest winds over the waters are forecast south of Cape Falcon,
where pressure gradients are tightest. Expect steep and choppy seas
8 to 10 ft at 7-8 seconds through Tuesday. Seas subside to around
4-6 ft mid-week onward as winds weaken. -Alviz

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...None.
WA...None.
PZ...Small Craft Advisory until 5 PM PDT Tuesday for PZZ251>253-
     271>273.
&&

$$

www.weather.gov/portland

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