Gresham, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

468
FXUS66 KPQR 260502
AFDPQR

Area Forecast Discussion...UPDATED
National Weather Service Portland OR
1000 PM PDT Sat Jul 25 2026

...Updated aviation discussion...

.SYNOPSIS...Onshore flow will bring near average temperatures
with varying degrees of morning clouds and afternoon sunshine
for much of the next week. A series of weak fronts will bring
notable chances for light rain and drizzle to portions of the
north coast this afternoon and evening, Sunday and then again on
Tuesday.

&&

.DISCUSSION...Now through Saturday...Visible satellite imagery
reveals a small low pressure moving north-northeastward
off the Washington coast. Marine clouds have pushed across much
of the region except across the Cascades south of Mt Hood.
Doppler radar indicates light returns (rain) spreading onto the
north coast this afternoon. While rain reaching the ground has
been limited so far, we are expecting at least a few locations,
particularly across the higher terrain of Tillamook northward to
Pacific Counties to wring out a couple hundredths of an inch of
rain by later tonight. While not terribly impactful, south to
southwesterly winds will be the most unusual aspect of this
storm system with winds currently gusting near 30-35 mph along
portions of the coast and between 15-30 mph in the Willamette
Valley. Winds should subside this evening as the lower
atmosphere stabilizes and the wind field aloft weakens.

A secondary stronger front is currently out near 130W off the
Pacific Northwest coast. Models are in good agreement it will
shift towards the region, but there remains quite a bit of
uncertainty in how much it will hold together as it moves
towards the region, and more importantly, whether or not it
will push into our northwestern zones or stall offshore. At this
point, there is a sharp gradient in rain chances between even
northern Pacific County and southern Clatsop County on Sunday.

Height fields build a touch going into Monday, which will reduce
rain chances and allow for high temperatures to climb more
solidly into the 80s for inland valleys. Another weak front is
slated to clip the Pacific Northwest Tuesday as a shortwave
trough lifts northeastward into British Columbia. Rain chances
will once again most likely be limited to the far north Oregon
and Washington coast, but there is a 30% chance at least some
light rain reaches the Kelso/Longview area. There is a just a
10% chance that rain reaches the Portland/Vancouver area on
Tuesday with rain probabilities decreasing even more towards
Salem and Eugene. Regardless, this passing storm system will
reinforce marine clouds and cooler temperatures with high
temperatures likely falling several degrees on Tuesday relative
to Monday.

In general, ensembles are in general agreement that our 500 mb
height field will increase midweek with the end result being a
warming trend late in the work week. Around 30-40% of the
global ensemble guidance suggests a shortwave trough will dampen
the weak ridging in place late in the week and allow another
weak front to graze our northwestern coastal zones around next
Saturday.      /Neuman

&&

.AVIATION...Through 06z Monday...Satellite imagery and terminal
observations as of late Saturday evening depicts increasing stratus
across northwest Oregon following a frontal passage earlier this
evening. Willamette Valley terminals currently remain VFR while
CIGs remain lower along the coast with MVFR CIGs at KAST and LIFR
CIGs at KAST. High confidence for these trends continuing along
the coast through Sunday as onshore flow persists. For inland
terminals, stratus will gradually blanket the Valley overnight as
the low level atmosphere moistens. Generally expecting low-end
VFR CIGs (<5 kft) across the Valley with a 20-40% chance for MVFR
CIGs at any given hour between 10-17z Sun. After 17-18z Sun,
increased mixing from daytime heating will help scatter out
stratus and return VFR conditions across the Valley. Light and
variable winds tonight <5 kt becoming more west-southwesterly and
increasing to 5-10 kt Sunday afternoon.

KPDX AND APPROACHES...Predominately VFR conditions with CIGs
around 5 kft or less tonight. 20-30% chance for MVFR CIGs at any
given hour between 10-17z Sun. Increased cloud breaks after 18z
Sun. Variable winds under 5 kt tonight becoming westerly 5-8 kt
Sunday afternoon.       -10

&&

.MARINE...A weak low pressure is lifting north-northeastward
off the Washington coast this afternoon. This storm system has
resulted in Small Craft Advisory level wind gusts of 25 kt and
steep seas across portions of the water so far today. There
remains about a 10% chance of wind gusts rising briefly into the
30-35 kt range within 20 NM of the coast, but this appears less
and less likely based on the latest observations and trends.
Expect winds to drop below advisory level thresholds upon
frontal passage. This appears most likely to occur between 4-8pm
Saturday. Seas will take several hours thereafter to subside,
though.

Another weak front will approach the waters late Sunday into
early Monday with just a 30-40% chance that the far outer
waters beyond 40 NM north of Cape Falcon will see southerly wind
gusts at least briefly rise into the 22-25 kt range. Another
front will push towards the waters late Monday into Tuesday.
While this front stands a better chance (~50-60%) of bringing
southerly 22-25 kt wind gusts to all of the waters north of Cape
Falcon, the probability those winds extend as far south as Cape
Foulweather is just 10-20%.

Winds appear likely to return to a more typical Summertime
northerly wind pattern during the latter half of next week.
There is a 30-40% chance another weak front moves towards the
Pacific Northwest and turns winds southerly next Saturday-ish.
Once we get past the steep seas of today, seas will generally be
in the 3-5 ft range for much of the next week unless some of
the stronger wind scenarios mentioned above come to fruition.
/Neuman

&&


.PQR WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
PZ...Small Craft Advisory until 8 PM PDT this evening for PZZ210-
     251>253-271>273.

&&


$$

www.weather.gov/portland

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