Oregon City, Oregon 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

946
FXUS66 KPQR 172158
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
258 PM PDT Thu Apr 17 2025

.SYNOPSIS...High pressure will allow dry conditions and above
normal temperatures to persist through the end of the work week
as our stretch of pleasant weather continues. A series of
disturbances will bring closer to average temperatures for the
weekend and into early next week along with a chance for light
showers.

&&

.DISCUSSION...Now through Wednesday...Benign conditions
continue across the region as an upper level short wave ridge
moves into the PacNW. Temps currently in the mid to upper 60s
inland will peak in the upper 60s to low 70s inland with mid 60s
expected along the coast. Friday will be even warmer inland
with temps in the mid to upper 70s with temps similar to
Thursday along the coast. Probabilities for reaching 70 inland
are greater than 70% and range from 20-40% in the Willamette
Valley except around the Portland metro with probs much higher
with a 50-80% chance. Temps on Friday should be around 5 degrees
above average along the coast and around 10-15 degrees above
average inland. Min RH values during the day Friday will drop
into the 20-30% range (40-50% along the coast) as the dry
airmass remains in place and temps rise well above normal. Not
expecting any fire weather concerns at this time as winds remain
below 10 kt and gusts up 15 kt.

Expect northerly to northeasterly offshore winds in the
lowlands and easterly downslope winds on the west side of the
Cascades and Coast Range as a thermal low remains in place at
the surface through Friday. Winds shift back to onshore flow as
a weak disturbance approaches the area Friday night.

The pattern shifts as we move into the weekend. A series of
short wave disturbances are expected to move across the region
shifting the short wave ridge east of the Cascades. Significant
precipitation is not expected through the weekend but light
showers are possible, mainly along the north OR/south WA coasts
and north of the Portland metro. The first disturbance is
expected to cross the area late Friday night into Saturday but
given the dry airmass currently in place, it is unlikely to
bring significant rain. The second disturbance enters the region
on Sunday and may have a better chance at producing a
accumulations of a few hundredths. Temperatures drop close to
normal, possible a degree or two below normal for the weekend
and into early next week. -Batz

&&

.AVIATION...High pressure over the region will maintain VFR
conditions under clear skies through the TAF period. Expect
northwesterly winds around 8-12 kt with gusts to 20-25 kt along
the coast and Willamette Valley through 02-03z Fri. Winds
gradually weaken tonight as pressure gradients ease.

PDX AND APPROACHES...VFR through the TAF period. Northwest winds
5-10 kt through this evening, becoming light and variable
overnight.     -Alviz

&&

.MARINE...Benign marine conditions through Friday as high pressure
maintains northerly winds around 10-15 kt. Tonight into early
Friday morning, pressure gradients in the southern waters may be
tight enough to lead to breezy northerly winds with gusts up to 25
kt (40-60% probability). Though very marginal, a Small Craft
Advisory is in effect from 5 PM Thursday to 5 AM Friday for the
waters south of Cape Foulweather. Expect seas around 5-7 ft at 13
seconds through Friday evening.

Saturday, a weak frontal system moving down the British Columbia
coast into Washington will strengthen northwesterly winds across
the waters with gusts to 25-30 kt and seas building to 7-9 ft at
12 seconds.      -Alviz

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...None.
WA...None.
PZ...Small Craft Advisory until 5 AM PDT Friday for PZZ253-273.
&&

$$

www.weather.gov/portland

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