869
FXUS66 KPQR 142105
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
205 PM PDT Mon Jul 14 2025

.SYNOPSIS...Hot, dry and clear skies are on deck over the next
48 hours. Morning marine stratus/fog along the coast that will
temper daytime highs. A Heat Advisory has been issued for some
interior valley locations starting late Tuesday morning through
at least Wednesday night. Daytime highs between 90 to 100
degrees and overnight low temperatures between 65 and 70
degrees for inland locations with cooler temperatures along the
coast. Slightly cooler conditions expected for the latter part
of the week and into the weekend.

&&

.SHORT TERM...Tonight through Thursday Night...Hot and dry
conditions return Tuesday and Wednesday. A broad area of high
pressure will start to build over the region. This will bring
very warm 850 mb temperatures increase on Tuesday to around
18-20 C and on Wednesday to 21-24 C. This will lead to temps in
the low to mid 90s inland on Tuesday and upper 90s with a few
triple digits possible on Wednesday. Temperatures along the
coast expected to top out in the mid 60s to mid 70s both days.

Probabilities for reaching 100 degrees F on Tuesday are minimal
for most of the forecast area. Locations with the highest
probability are within the north-central part of the Willamette
Valley (20-45% probability) with locations near Salem and Eugene
both having around a 10% probability. Probabilities for daytime
highs reaching 100 degrees F are much higher on Wednesday at
45-80%. Locations with the highest probability are in and around
Salem, OR and near McMinnville, OR. Areas around the
Portland/Vancouver Metro, Corvallis and Eugene have around a
50-70% probability. It cannot be ruled out that areas near Salem
could also see daytime highs nearing 105 degrees F with around
a 15% probability. Portland/Vancouver Metro area has around a 1%
probability with Eugene around a 3% probability of reaching 105
degrees F.

On top of the hot conditions during the day, overnight lows
Tuesday night into Wednesday morning are expected to remain mild
in the mid 60s to around 70, resulting in very little reprieve
from the heat. Given the minimal changes in the forecast over
the past few model runs, will maintain the current Heat
Advisory which has been issued for the Portland/Vancouver
Metro, Willamette Valley, Lower Columbia and Cowlitz Valleys,
and the Columbia River Gorge from noon Tuesday through 10 pm
Wednesday.


As we move beyond Wednesday and into Thursday, models have the
forecast area starting a cooling trend. The cause is a series of
weak upper level lows moving south our of western Canada. These
lows will bring 850 mb temperatures around 15-17 C which will
result in daytime highs on Thursday in the upper 80s to low 90s
for the Willamette Valley, upper 70s to upper 80s for the
Cascades and mid 60s to mid 70s along the coast. The cooling
trend is expected to continue through the weekend. More info on
that time frame will be found in the long term discussion.
/42-Batz


.LONG TERM...Friday through Sunday...Long-range ensemble guidance
depicts mean troughing developing over the Pacific Northwest Friday
and continuing through the weekend. Members show varied shortwave
troughs moving across the region, but the details of the timing and
amplitude of these waves remain low confidence at this lead time.
This large-scale pattern would favor continued onshore flow, with
coastal temperatures remaining steady while inland communities trend
cooler and toward seasonal norms. Chances for precipitation remain
minimal, with only a handful of ensemble members suggesting any
accumulating rainfall from the transient shortwaves. -Picard

&&

.AVIATION...High pressure throughout the area, with most areas
seeing clear sky VFR. Some persistent MVFR cigs remain at the
northern coast (KAST, KTMK), and these see a 50-70% chance of
remaining in place until 15z Tue. For the rest of the coast
(KONP), MVFR stratus is expected to redevelop around 6z Tue,
lasting through the rest of Monday night.

For inland terminals, between 9-16z Tue there is a 30-50% chance
of MVFR stratus redeveloping throughout most of the Willamette
Valley terminals, though this should only last for a few hours.
Northerly flow throughout the day, with gusts to 25 kts possible
at the coast this afternoon, and 15-20 kts inland.

PDX AND APPROACHES...Generally VFR throughout the period, though
there is a 30-50% chance of MVFR stratus developing between 9-16z
Tue as marine stratus redevelops. Winds north-northwesterly
throughout the day, with gusts to 18-20 kts possible during
afternoon hours on Monday afternoon. Winds decreasing heavily
after 5z Tuesday. /JLiu

&&

.MARINE...Morning fog has dissipated, and the cloud deck has
lifted somewhat to a low broken deck. A very weak trough passes
through the area this afternoon, bringing some slightly weaker
winds and increase in seas. The current Small Craft has been
extended through Tuesday morning owing to slightly elevated seas,
rising to 7-10 ft at 9-10 seconds by this evening. The
combination of northerly gusts to 25 kts and elevated seas will
lead to occasional Small Craft Conditions until the latter half of
the week.

A thermal trough rebuilds inland Tuesday into midweek, which
combined with the high pressure over the Pacific will bring the
return of increased north winds. Small Craft Advisory level winds
will be tied to the diurnal cycle, with northerly gusts up to
20-25 kts possible during daytime hours on Tuesday and Wednesday.
Calmer winds and seas expected in the latter half of the week.
/JLiu

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...Heat Advisory from noon Tuesday to 10 PM PDT Wednesday for
     ORZ108>122.

WA...Heat Advisory from noon Tuesday to 10 PM PDT Wednesday for
     WAZ204>207-209-210.

PZ...Small Craft Advisory until 11 PM PDT this evening for PZZ251>253.

     Small Craft Advisory until 11 AM PDT Tuesday for PZZ271>273.

&&

$$

www.weather.gov/portland

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