Gresham, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

189
FXUS66 KPQR 251814
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
1114 AM PDT Fri Jul 25 2025

.UPDATED AVIATION DISCUSSION.


.SYNOPSIS...
More seasonal temps expected today through Sunday
as onshore flow is enhanced by increased upper level troughing.
Another warm up is expected early to mid next week, with
thunderstorms looking possible along the Cascades.

&&

.SHORT TERM...Now through Sunday Night...
Now through Sunday Night...Little change in
sensible weather across the area this morning as satellite
imagery once again shows marine stratus entrenched over coastal
areas and making progress into the Coast Range gaps and interior
valleys of southwest Washington as of 3 AM Friday. Observational
trends and latest hi-res guidance suggest cloud cover will fill
into the Willamette Valley and from both the north and south
around daybreak, yielding a cloudier start to the day today. In
the upper levels, large scale troughing over western Canada will
begin to sag southward into the region today, with gradual 500
mb height falls and decreasing 850 mb temps corresponding to
more seasonable highs in the upper 70s to low 80s in the
interior valleys this afternoon. Expect more of the same through
the weekend as upper level troughing and onshore flow maintain
temperatures near seasonal norms, with a deeper marine layer
contributing to nightly stratus intrusions into the interior
valleys. /CB

.LONG TERM...Monday through Thursday...Monday will kick off
another stretch of warmer weather as ensemble clusters show
good agreement on high pressure rebuilding over the western
CONUS. This will send inland high temperatures back towards 90
degrees during the first half of next week. Although hotter
temperatures are expected, the potential for more significant
heat related concerns remains relatively low at this time as the
probability to reach 95 degrees generally stays below 20% and
HeatRisk remains mainly in the minor category through the
period. The other concern for next week will be thunderstorm
potential as guidance continues to depict a deep upper level
trough setting up over the NE Pacific and establishing southerly
flow over the Pacific Northwest, helping to draw rich mid level
moisture into the region. NBM guidance has started to catch
onto this scenario, depicting chance to slight chance PoPs
along the Cascades from Tuesday into Thursday of next week.
Opted to introduce a chance of thunderstorms to match those PoPs
given the potentially favorable synoptic setup. Will continue
to closely monitor thunderstorm potential for next week in the
coming days. /CB

&&

.AVIATION...Late this morning satellite shows marine stratus
rapidly dissipating across the region with most sites now
experiencing VFR conditions. That said, it will take a bit longer
for KAST to clear out midday into the afternoon hours. Expect yet
another surge of marine stratus tonight knocking coast sites back
down to MVFR. We`ll have to watch low clouds around the Portland
Metro and KEUG in the 12-16z timeframe Saturday morning with the
highest confidence for a drop in categories at KTTD, much lower
confidence KPDX. Winds stay fairly light, generally less than 10
knots.

PDX AND APPROACHES...MVFR CIGs have cleared with VFR conditions
persisting the rest of the daytime and evening hours. Models
indicate around a 30-40% chance for the return of MVFR CIGs 12-16z
Saturday morning - a period we`ll have to watch closely. More than
likely the low clouds remain locked just to the north and east of
the terminal. -Schuldt

&&

.MARINE...Going through the end of the work week through the
weekend high pressure will maintain north to northwesterly winds
with gusts around 13-18 knots during the afternoon/evening
hours each day. Background swells don`t look particularly
noteworthy so seas likely remain around 3-6 ft each day into
next week. Small Craft advisory conditions are unlikely this
week. There will be some strong ebb currents through the
Columbia River bar this morning and Saturday morning, which may
lead to locally choppy seas. ~Hall/Schuldt

&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
PZ...None.
&&

$$

www.weather.gov/portland

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