Area Forecast Discussion
Issued by NWS Portland, OR

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FXUS66 KPQR 270350

Area Forecast Discussion
National Weather Service Portland OR
845 PM PDT Mon Jun 26 2017

.SYNOPSIS...Dry northwesterly flow will bring near average
temperatures and a pattern of morning clouds and afternoon sunshine.
Temperatures may warm a bit toward the end of the week and early next


.SHORT TERM...Tonight through Thursday...Visible satellite imagery
reveals marine clouds are fully entrenched along the coast and are
slowly pushing inland. These clouds should fill in across most of the
CWA below 4-5kft overnight. Models indicate clouds should clear
suprisingly fast on Tuesday. Suspect this is a bit overdone though
given the depth of the marine layer so it may hold off until mid-late
afternoon. Expect deja vu on Wednesday...although morning clouds
may not be quite as extensive across the central and southern
Willamette Valley and adjacent Cascades. Shortwave ridging will build
over the Pacific Northwest Wednesday night and Thursday, which
should lead to fewer morning clouds and Willamette Valley high
temperatures warming into the low 80s. /Neuman

.LONG TERM...Thursday night through Monday...No Changes...Previous
Discussion From Monday Afternoon Follows...Flat upper level ridging
is modeled to reside over the Pac NW Fri and Sat. The low level flow
remains weakly onshore, which should keep cool and partly to mostly
cloudy conditions in place at the coast. However, do not think there
will be enough onshore to bring a whole lot of clouds into the
interior on Fri or Sat mornings. With the increased sunshine and
slightly warmer air mass, expect highs for the lowlands to remain in
the low to mid 80s for the interior. An upper level shortwave is
modeled to drop into the region Sun into Mon. This should again
increase the onshore flow and strength of the marine
pushes, limiting temps back in the 70s. Pyle


.AVIATION...Onshore low level flow will continue through tonight
and Tuesday. Expect MVFR cigs to return inland later tonight and
continue through the morning before lifting to VFR again Tuesday
afternoon. The coast will continue to be MVFR this evening,
dropping to IFR overnight then returning to MVFR Tuesday.

KPDX AND APPROACHES...MVFR cigs likely to return starting between
12Z and 15Z Tuesday, lifting to VFR during the afternoon on
Tuesday. Bowen


.MARINE...Very weak lower pres over the waters will give way to
building high pres, remaining along the coast through most of
the week. This building higher pressure will shift all winds to
more northwesterly and northerly this evening and continue
through the week. The winds may come close to Small Craft
Advisory thresholds during the afternoon and evening on Tuesday
and Wednesday mainly in the far outer waters, but it looks very

Seas to continue well below 10 ft for the next several days.
Currently seas are around 5 to 6 ft with a 7 to 9 second
dominant period. Seas will be somewhat choppy but does not look
like it will exceed advisory criteria. Periods will lengthen a
bit later in the week. Bowen/pt





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This discussion is for Northwest Oregon and Southwest Washington
from the Cascade crest to 60 nautical miles offshore. This area is
commonly referred to as the forecast area. is the U.S. government's official web portal to all federal, state and local government web resources and services.