Lebanon, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

884
FXUS66 KPQR 262057
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
157 PM PDT Sat Jul 26 2025

.SYNOPSIS...Benign onshore flow keeps temperatures near
seasonal norms through this weekend. Temperatures trend warmer
again during the first half of next week, with thunderstorms
looking increasingly possible along the Cascades each afternoon
and evening.

&&

.SHORT TERM...Now through Sunday Night...Upper level troughing
continues to progress eastward, coming more overhead across the
PacNW today. Guidance initially suggested clouds clearing by
this afternoon but low level clouds have stuck around longer
across the region. This will likely stunt peak afternoon
temperatures, toping out in the mid to upper 70s inland.
Coastal areas and the Cascades are expected to reach the low 60s
to low 70s. Conditions on Sunday will be similar, though model
guidance is suggesting lower probabilities for cloud cover
developing inland late tonight. Chances are 20-50% as of now but
seem to be less coherent/homogeneous at this time. OVerall,
Sunday is expected to be a few degrees warmer than today with
highs topping out in the low 80s inland and mid 60s to low 70s
along the coast and Cascades. -Batz


.LONG TERM...Monday through Friday...Guidance continues to
suggest temperatures rebound back into the upper 80s to low 90s
Monday through Wednesday as ridging builds across the Great
Basin and into the PacNW. Probabilities for inland valleys to
reach 90 degrees on Monday are modest at 10-40% but increase
significantly Tuesday and Wednesday to 50-80% for most
locations. Although hotter temperatures are expected, a more
significant heat event continues to look unlikely as the
forecast envelope remains rather tightly clustered in the low
90s while HeatRisk largely remains in the minor category with a
few patches of moderate in the interior valleys. This is
underscored by NBM probabilistic guidance which continues to
keep chances to reach 95 degrees near or under 20% for the most
part. Guidance then suggests temperatures will begin to moderate
back towards seasonal norms late in the week as the ridge axis
begins to shift further east.

A deepening upper level low is also likely to set up off the British
Columbia coast, though there is disagreement among the models where
exactly the center of the low sets up. Depending on where it
sets up, south to southeast flow could set up across the PacNW
or at least a portion of the area, bringing monsoonal moisture
and potential for thunderstorms. Persistent southerly flow will
help increase PWAT values to 1.0-1.2 inches east of the coast
range. These values are 120-160% of normal for this time of year
with the higher larger anomalies across the Cascades of Lane
and Linn county. Disturbances embedded within the upper level
flow will help support destabilization across central Oregon and
to a lesser extend over the Cascade crest. For now, have
introduced a 15-20% chance for the far eastern portions of Lane
and Linn counties Monday and Tuesday evenings. Agreement and
exact details become murkier into the middle of next week but
the threat for thunderstorms along the crest remains. A stronger
embedded shortwave is expected to move through the upper levels
across northern California and Oregon which would bring better
large-scale accent and possibly greater thunderstorm coverage
Wednesday and Thursday evenings. Models also show potentially
weak steering flow which could lead to slow storm motion and
localized heavy rains. -Batz


&&

.AVIATION...Onshore flow continues this afternoon with the marine
stratus deck lifting and breaking up across the northern
Willamette valley and north Oregon coast - conditions trending
back to VFR. Expect these VFR conditions to persist into the
evening before stratus redevelops along the coast 03-09z before
pushing inland 12-15z. Thus, expect degraded conditions Sunday
morning before VFR CIGs/VIS return Sunday afternoon. Expect fairly
light winds through the forecast period, with gusts generally
below 10-15 knots.

PDX AND APPROACHES...This afternoon CIGs have lifted back to VFR
with continued clearing skies into the evening hours. However,
we`ll likely see the return of MVFR stratus come early Sunday
morning before clearing occurs midday Sunday and VFR CIGs return -
low to moderate confidence regarding the timing of the clearing.
-Schuldt

&&

.MARINE...Surface high pressure continues to reside across the
coastal waters through the latter half of the weekend into next
week facilitating rather benign conditions going forward. Expect
winds to remain generally out of the north through at least the
middle of the coming week although there may be a bit of a
easterly component to the flow on Sunday. Tuesday onward these
northerly winds will be a little breezier compared to
Sunday/Monday with gusts in the 15-20 knot range during the
afternoon and evenings. Fortunately, background swells remain
unimpressive through the middle of next week as well, so given
the aforementioned winds the likelihood for Small Craft advisory
conditions are low. -Schuldt

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

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

&&

$$

www.weather.gov/portland

Interact with us via social media:
www.facebook.com/NWSPortland
x.com/NWSPortland