FXUS66 KPQR 090553 AAA
AFDPQR

Area Forecast Discussion...UPDATED
National Weather Service Portland OR
1053 PM PDT Wed Jul 8 2026

Updated Aviation Discussion...

.SYNOPSIS...Persistent onshore flow will continue to yield dry
and seasonable weather through this weekend. Temperatures trend
warmer early next week as high pressure builds over the Plains.

&&

.DISCUSSION...Now through Tuesday...Largely zonal flow aloft
beneath the base of an upper-level trough moving inland through
British Columbia has supported more widespread low cloud cover 
this morning. Satellite trends depict rapid clearing and mostly 
sunny skies are expected today across the region, save perhaps 
the far-northern Oregon and south Washington coasts. Another 
upper trough or closed low moving into British Columbia this 
weekend will see flow aloft turn southwesterly, resulting in 
only minor changes to the sensible weather locally, namely a 
farther inland penetration and delayed clearing of overnight and
morning cloud cover. As such, seasonable weather will continue 
with afternoon high temperatures within a few degrees of 80F 
inland and in the low to mid 60s along the coast, overnight lows
in the upper 40s to low 50s, and largely dry conditions. The 
only exception may be areas of mist or drizzle along the coast 
and Coast Range during the early morning hours when marine 
stratus cover is at its thickest.

Early next week, there is high confidence that broad upper 
ridging will develop over the Central Plains, pushing heights
aloft higher and favoring a warming trend locally. Most-likely
high temperatures through the first half of next week look to
reach the mid to upper 80s inland and mid 60s to near 70 degrees
along the coast, while overnight lows similarly push a few
degrees warmer into the 50s across the region. This combination
of temperatures continues to support Minor HeatRisk across the
majority of the region with isolated areas of Moderate HeatRisk
in the Portland/Vancouver metro and through the Columbia Gorge.
There remains a broad region from Salem north through the Lower
Cowlitz Valley and east along the I-84 corridor through the
Gorge where there is a 20-50% chance of Moderate HeatRisk on 
both Monday and Tuesday if forecast temperatures trend warmer, 
with the highest likelihood in the Lower Tualatin Valley 
(Beaverton, Tigard, Tualatin) and neighboring portions of 
Multnomah and Clackamas Counties (Portland, Wilsonville). 
Chances for Major HeatRisk are 5% or less across the region. 
Uncertainty in the temperature forecast increases beyond midweek
as consensus is relatively low in the long-term evolution of 
the strong upper ridge. Nonetheless, chances for rain remain 
minimal through the period. -36

&&

.AVIATION...Light zonal flow aloft persists through the day, 
gradually shifting southwesterly near the end of the TAF period.
While inland terminals will stay VFR through the entire period,
coastal terminals will likely experience MVFR/IFR CIGs between
08-20Z Thu as marine stratus pushes into the coast (20-40% chance
of IFR CIGs, highest at KAST). While CIGs along the coast will 
likely improve back to VFR after 20Z Thu, probabilistic guidance 
suggests the potential of MVFR CIGs after 02-03Z Fri (20-40% 
chance of MVFR CIGs). Otherwise, expect mostly north to
northwesterly winds through the period, 5-10 kt with afternoon 
gusts up to 20 kt possible at inland terminals and 7-15 kt with 
afternoon gusts up to 25 kt possible at coastal terminals (highest
winds at KONP).

KPDX AND APPROACHES...VFR through the TAF period. Northwest winds
around 5-10 kt with gusts up to 20 kt possible between 00-06z 
Fri. 	~12

&&

.MARINE...High pressure will maintain north to northwesterly winds
across the coastal waters through the week. Winds generally remain
around 15 kt or less, though pressure gradients are expected to
tighten later this afternoon and evening producing gusts up to 25
kt near the central Oregon coast. Thus, have issued a Small Craft
Advisory for the coastal waters south of Cape Foulweather between
3 PM today and 2 AM tonight. Isolated gusts up to 20-22 kt will 
also be possible south of Cape Falcon. 

Conditions ease slightly on Thursday, and moreso on Friday, as a 
weak front approaches the waters. Seas are expected to remain
around 4 to 6 ft as relatively benign conditions persist through 
the remainder of the week and into the weekend. /DH

&&

.PQR WATCHES/WARNINGS/ADVISORIES...

OR...None.
WA...None.
PZ...Small Craft Advisory until 2 AM PDT Thursday for PZZ253-273.
&&

$$

www.weather.gov/portland

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