124
FXUS66 KPQR 141054
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
354 AM PDT Tue Oct 14 2025

.SYNOPSIS...
A low pressure system continues to move south of the Pacific
Northwest into northern California, allowing skies to stay clear
and offshore flow to increase this afternoon. A broad upper-
level ridge will gradually move overhead today through the end
of the week, supporting dry weather and near- normal
temperatures through Saturday. A weak front may brush the area
late Thursday into Friday with a few light showers. By the
weekend, another Pacific front looks increasingly likely to move
inland, bringing a more notable chance of measurable rainfall.

&&

.DISCUSSION...Now through Sunday...
Clearing skies and light winds overnight led to strong
radiational cooling across many interior valleys early this
morning. As a result, temperatures continue to drop towards
the low to mid 30s in wind-sheltered areas, which would produce
areas of frost. The Freeze Warning for the Upper Hood River
Valley remains in effect through 9 AM this morning, where lows
this morning are expected to fall into the upper 20s to near
freezing.

Dry weather continues through the remainder of today under
mostly sunny skies, though east winds will persist, particularly
through the Columbia River Gorge where gusts up to 25 to 30 mph
remain possible. These winds are maintaining slightly milder
temperatures in exposed areas, but elsewhere, the clear and dry
conditions will support another cold night ahead.

Overnight into early Wednesday morning, similar conditions are
expected with calm winds and clear skies for most of the area,
allowing for another round of frost. Frost Advisories have been
issued from midnight through 9 AM Wednesday for the Lane County
Cascade Foothills, Lane County Lowlands, Linn County Lowlands,
North Oregon Coast Range Lowlands, South Washington Cascade
Foothills, and Cowlitz County Lowlands. Temperatures are
expected to fall into the low to mid 30s in these zones, with
subfreezing temperatures again possible in the Upper Hood River
Valley, where a Freeze Watch remains in effect.

By Wednesday afternoon, the upper low over California will shift
eastward into the Great Basin, allowing weak ridging to build
overhead. This will bring lighter winds and continued dry, mild
fall weather through the end of the week. The ridge will
gradually flatten toward Friday as a weak front approaches from
the northwest. Only spotty light rain is expected with this
system - mainly along the coast and higher terrain, while most
interior valleys may remain dry.

Temperatures will hold near seasonal averages through Saturday,
with highs ranging from the upper 50s to mid 60s each afternoon.
Looking ahead, confidence remains fairly high that a more
organized Pacific front will move inland later Saturday or
Sunday. This system should bring the next round of measurable
rainfall. Currently probabilities favor around a 50-70% chance
for at least one inch of rain along the coast, and a 20-40%
chance inland through Sunday night.
~12

&&

.AVIATION...Expect continues VFR conditions throughout the
airspace through the TAF period. East to northeast winds around 5
to 10 kt overnight, then increasing to 10-15 kt with wind gusts
up to 20 kt possible for a few TAF sites between 17Z Tuesday and
03Z Wednesday.

KPDX AND APPROACHES...VFR conditions expected through the TAF
period. East to northwest winds 5-8 kt overnight, then 8-10 kt
between 18Z Tuesday and 03Z Wednesday. Gusts up to 18-20 kt
possible.
~12

&&

.MARINE...Low pressure continues to drop southward, currently
located over the coast of Northern California, supporting
northeast flow through today. Winds 15-20 kt with gusts to 25 kt
over the central and southern outer coastal waters will slowly
weaken through today as the pressure gradient over the region
decreases. Northeasterly winds this morning will slowly shift to
northerly by the evening, then northwesterly by Wednesday. Seas
6-8 feet at 9 seconds will subside to 4-6 feet by Wednesday and
persist around these heights until late Friday.

While the weather pattern remains a bit uncertain for this
upcoming weekend, model guidance for wave heights has come into
slightly better agreement. On Saturday, there is moderate to high
confidence for seas around 7 to 8 ft. Sunday shows a large range
for potential wave heights. Given the spread in models, there is
moderate to high confidence that significant wave heights can be
anywhere from 9 to 18 feet. Low to moderate confidence that the
most significant wave heights will occur late Sunday.
~12

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...Frost Advisory until 9 AM PDT this morning for ORZ104-108-109-
     116>118-124-125.

     Freeze Warning until 9 AM PDT this morning for ORZ121.

     Freeze Watch from late tonight through Wednesday morning for
     ORZ121.

WA...Frost Advisory until 9 AM PDT this morning for WAZ204>206-208.

PZ...Small Craft Advisory until 11 PM PDT this evening for PZZ272-273.
&&

$$

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