Canby, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

301
FXUS66 KPQR 011217
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
417 AM PDT Sun Nov 1 2026

.SYNOPSIS...Mostly clear skies and calm winds may bring frost
and/or fog development across much of NW OR and SW WA in the
mornings through Monday. Mostly dry conditions through Tuesday.
Precipitation chances increase  Wednesday through late next week
with limited weather impacts expected.

&&

.DISCUSSION...Through Saturday...Surface observations and satellite
imagery early Sunday morning reveal widespread low stratus and fog
developing throughout the lowland valleys of SW Washington and NW
Oregon. A Dense Fog Advisory is in effect through 10 AM Sunday
across the area. Fog/low stratus should dissipate by midday with
sunny skies and high temperatures in the 50s. Dry conditions are
expected today into Monday as an upper level ridge of high pressure
builds over the PacNW. Similar conditions are likely Monday morning
as radiational cooling under clear skies and calm winds allows
minimum temperatures outside of urban areas to cool into the 30s.

Latest model ensemble guidance is in good agreement that a low
pressure system develops off the northern California coast late
Monday into Tuesday and moves east, remaining south of the forecast
area. In turn, precipitation chances have decreased to around 10% or
less, while afternoon high temperatures are likely to warm into the
upper 50s to lower 60s. High pressure returns late Tuesday into
Wednesday as a shortwave upper level ridge moves over the region.

Behind this, a shortwave trough quickly pushes a frontal system
toward the coast later Wednesday, increasing precipitation chances
across the area through Wed night. Most ensembles indicate this
system will be weakening with just light amounts of rainfall most
likely. Cluster analysis of 500 mb heights is in relatively good
agreement heading into the latter part of the week with zonal to
southwest flow aloft allowing for a somewhat active pattern over the
NE Pacific to approach the coast. There is still quite a bit of
uncertainty in regards to rainfall coverage and amounts, but there
is potential for multiple rounds of systems moving across the area
into next weekend. At this point, no significant precipitation
impacts are expected with any of these weather systems. /DH

&&

.AVIATION...Through 12Z Monday...Northwest winds aloft as an upper
ridge of high pressure builds over the region today. Satellite
imagery and surface observations show widespread low stratus and
fog developing along the lower Columbia River and through the
Willamette Valley. As of 12z, predominately LIFR conditions are
present, with the exception of KTTD at the moment. But clouds and
fog continue to fill in and are expected to persist through at
least 18-20z Sunday as a subsidence inversion strengthens this
morning. Most terminals should see improvement back to VFR by
19-21z this afternoon, likely persisting longest within the
southern and central Willamette Valley, including KSLE and KEUG.
There is relatively high confidence (40-50% chance) for similar
IFR to LIFR conditions to redevelop later tonight after 06z
Monday. Winds generally remain light and variable through the TAF
period.

KPDX AND APPROACHES...Conditions have deteriorated to LIFR as
stratus and fog continue to spread across the area. Guidance
suggests conditions gradually improve between 18-20z with VFR
likely after 20z this afternoon. There is around a 30-40% chance
that IFR conditions redevelop by 12z Monday. Light northwest winds
become more variable today. /DH

&&

.MARINE...Fairly benign conditions are expected across the coastal
waters today as high pressure returns. Winds remain light below 10
kt through this evening. Offshore winds develop late tonight and
persist into early next week. Seas have fallen to around 3 to 4
ft this morning, but an incoming long period west-northwest swell
is expected to build seas, beginning later this afternoon, to
around 8 to 10 ft at 15-18 seconds Monday morning. Have issued a
Small Craft Advisory for the outer coastal waters for wave heights
peaking at around 10 ft through Tuesday morning. This long period
swell will result in a moderate threat for sneaker waves at the
coast Sunday evening through Tuesday. Caution should be used at
beaches when in or near the water.

A weak frontal system approaches the waters on Wednesday,
returning increasing southerly winds. By the end of the week,
model guidance hints at a stronger system entering the waters,
resulting in a 60-80% chance for maximum wind gusts exceeding 21
kt on Friday with a 30-50% chance for seas exceeding 15 ft. /DH

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...Dense Fog Advisory until 10 AM PDT this morning for ORZ108-109-
     111-112-114>118.

WA...Dense Fog Advisory until 10 AM PDT this morning for WAZ204>207.

PZ...Small Craft Advisory from 7 AM Monday to 7 AM PDT Tuesday for
     PZZ271>273.
&&

$$

www.weather.gov/portland

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