275
FXUS66 KPQR 081042
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
342 AM PDT WED JUL 8 2026
SYNOPSIS
PERSISTENT ONSHORE FLOW AND VARYING DEGREES OF MORNING
CLOUD COVER WILL BRING SEASONABLE TEMPERATURES JULY 8-11 ALONG
WITH CONTINUED DRY WEATHER. TEMPERATURES TREND WARMER JULY 12-14
AS UPPER LEVEL FLOW BECOMES SOUTHWESTERLY UPSTREAM OF AN AMPLIFYING
UPPER LEVEL RIDGE OVER THE CENTRAL U.S.
DISCUSSION...TODAY THROUGH TUESDAY
THE FORECAST IS
HIGHLIGHTED BY PERSISTENT ONSHORE FLOW, SEASONABLE TEMPERATURES,
AND CONTINUED DRY WEATHER ACROSS THE CWA. MODEL ENSEMBLE
GUIDANCE IS IN GOOD AGREEMENT FOR AN EXTENDED PERIOD OF NEAR
ZONAL FLOW ALOFT FROM TUESDAY NIGHT THROUGH AT LEAST THURSDAY
NIGHT. UPPER LEVEL FLOW BECOMES MORE SOUTHWESTERLY LATE FRIDAY
INTO THE WEEKEND. AT THE SURFACE, ONSHORE FLOW IS EXPECTED TO
PERSIST. THIS TYPICAL SUMMER-TIME WEATHER PATTERN WILL BRING
TEMPERATURES THAT ARE AROUND NORMAL FOR THIS TIME OF YEAR.
ONSHORE FLOW AT THE SURFACE WILL ALSO RESULT IN VARYING DEGREES
OF MORNING CLOUD COVER AND PLENTY OF AFTERNOON SUN. EXPECT
DAYTIME HIGHS IN THE UPPER 70S TO LOW 80S FOR INLAND VALLEYS
WITH HIGHS IN THE LOW 60S TO LOW 70S ALONG THE COAST AND HIGH
CASCADES THROUGH SATURDAY. AS THE WEEKEND APPROACHES, MODEL
SPREAD FOR TEMPERATURES BEGINS TO INCREASE SLIGHTLY OVER THE
WEEKEND FOR INLAND VALLEYS, WITH HIGHS RANGING ANYWHERE FROM THE
UPPER 70S TO UPPER 80S, WITH THE COAST AND CASCADES WARMING IN
A SIMILAR PATTERN, THUS HAVING DAYTIME HIGHS IN THE UPPER 60S TO
UPPER 70S. THE DAYTIME HIGH WILL BE HIGHLY DEPENDENT ON HOW
WIDESPREAD MORNING CLOUD COVER IS AND HOW EARLY IN THE DAY CLOUD
COVER IS ABLE TO SCATTER OUT. THE CURRENT FORECAST FAVORS MORE
WIDESPREAD AND PERSISTENT CLOUD COVER ON SATURDAY WHEN COMPARED
TO SUNDAY.
BEYOND THE WEEKEND, CONFIDENCE IS HIGH TEMPERATURES WILL BEGIN TO
WARM EARLY NEXT WEEK WITH LESS CLOUD COVER. THIS WARMING TREND IS IN
RESPONSE TO INCREASING 500 MB HEIGHTS AND 850 MB TEMPERATURES
UPSTREAM OF AN AMPLIFYING UPPER LEVEL RIDGE OVER THE CENTRAL UNITED
STATES. SINCE THE RIDGE AXIS WILL BE LOCATED EAST OF THE ROCKY
MOUNTAINS AND FAR REMOVED FROM THE PACIFIC NORTHWEST, EXTREME HEAT IS
NOT EXPECTED WITH THIS SYNOPTIC PATTERN. INSTEAD, A MORE MODEST
WARM-UP IS LIKELY WITH HIGH TEMPERATURES MOST LIKELY PEAKING IN
THE MID TO UPPER 80S FOR INLAND VALLEYS. MEANWHILE, THE COAST
WILL REMAIN COOLER WITH HIGHS STAYING IN THE LOW 60S TO LOW 70S.
IT SHOULD BE NOTED THAT THERE IS A 15-35% CHANCE FOR HIGHS OF
90 DEGREES OR WARMER ACROSS THE WILLAMETTE VALLEY, PORTLAND/VANCOUVER
METRO, COLUMBIA RIVER GORGE, AND UPPER HOOD RIVER VALLEY ON
MONDAY AND A 20-50% CHANCE FOR HIGHS OF 90 DEGREES OR WARMER ON
TUESDAY. CHANCES FOR HIGHS ABOVE 95 DEGREES ON MONDAY AND TUESDAY
ARE AROUND 10-20%, WITH THE HIGHEST PROBABILITY ON TUESDAY.
WHILE THIS PATTERN DOES NOT FAVOR EXTREME HEAT; PROBABILISTIC
HEATRISK GUIDANCE SUGGESTS THERE IS A 20-50% CHANCE FOR MODERATE
HEATRISK WITHIN THE WILLAMETTE VALLEY,PORTLAND/VANCOUVER METRO,
COLUMBIA RIVER GORGE, AND UPPER HOOD RIVER VALLEY MONDAY AND
TUESDAY, WITH HIGHER PROBABILITIES ON TUESDAY. /42-23
AVIATION
ONSHORE FLOW WILL CONTINUE THROUGH THE TAF PERIOD,
WHICH WILL SUPPORT MARINE STRATUS ALONG THE COAST. COASTAL SITES
ARE EXPECTED TO MAINTAIN A MIXTURE OF IFR TO LIFR CONDITIONS
THROUGH AT LEAST 16Z-19Z WEDNESDAY. CURRENT OBSERVATIONS ARE
SHOWING MARINE STRATUS PUSHING SOUTHWARD ALONG THE COLUMBIA RIVER
BRINGING MVFR CONDITIONS TO KPDX, KVUO AND KTTD. SAID STRATUS HAS
A 30-50% CHANCE OF ALSO SPREADING AND IMPACTING KUAO, KMMV AND
KHIO THROUGH 18Z-20Z WEDNESDAY. 20-30% CHANCE FOR MVFR STRATUS
IMPACTING KSLE AND KEUG THROUGH 20Z WEDNESDAY AS WELL. ANY
LOWERED FLIGHT CONDITIONS THAT DEVELOP WITHIN THE WILLAMETTE
VALLEY SHOULD IMPROVE TO VFR AROUND 19Z-22Z WEDNESDAY AND SHOULD
PERSIST THROUGH THE REMAINDER OF THE TAF PERIOD. AS FOR COASTAL
LOCATIONS, CONDITIONS SHOULD IMPROVE TOWARDS VFR/MVFR AROUND
19Z-21Z WEDNESDAY, BUT WILL RETURN TOWARDS IFR/LIFR AROUND
04Z-06Z THURSDAY.
NORTHERLY WINDS EXPECTED TO INCREASE AROUND 18Z-20Z WEDNESDAY TO
AROUND 10 KT. IN ADDITION, GUSTS ARE EXPECTED TO DEVELOP FOR
INLAND AND COASTAL LOCATIONS. FOR INLAND LOCATIONS, GUSTS UP TO 20
KT STARTING AROUND 19Z-21Z WEDNESDAY THROUGH 04Z-06Z THURSDAY.
FOR COASTAL LOCATIONS, GUSTS UP TO 25 KT POSSIBLE STARTING AROUND
18Z-20Z WEDNESDAY THROUGH 03Z-05Z THURSDAY. AFTERWARDS, NORTHERLY
WINDS WILL CONTINUE BUT LESS THAN 10 KT FOR THE REMAINDER OF THE
TAF PERIOD.
KPDX AND APPROACHES...CURRENT MVFR CONDITIONS WILL IMPROVE TOWARDS
VFR STARTING AROUND 17Z-19Z WEDNESDAY. NORTHERLY WINDS EXPECTED
TO INCREASE AROUND 18Z-20Z WEDNESDAY TO AROUND 10 KT WITH GUSTS UP
TO 20 KT STARTING AROUND 19Z WEDNESDAY THROUGH AROUND 04Z
THURSDAY. /42
MARINE
BROAD TROUGHING OVER THE EASTERN PACIFIC WILL HELP TO
MAINTAIN NORTH TO NORTHWEST WINDS, GENERALLY 15 KT OR LESS ACROSS
ALL WATERS. ISOLATED GUSTS UP TO 20 KT POSSIBLE THIS AFTERNOON
AND THURSDAY AFTERNOON FOR LOCATIONS SOUTH OF CAPE FOULWEATHER.
SEAS AROUND 4 TO 6 FT. LATEST GUIDANCE SUGGESTS SIMILAR CONDITIONS
CONTINUE INTO THURSDAY WITH WINDS EASING SLIGHTLY ON FRIDAY AS A
WEAK FRONT APPROACHES THE WATERS. OTHERWISE, RELATIVELY BENIGN
CONDITIONS EXPECTED TO PERSIST THROUGH THE WEEK AND INTO THE
WEEKEND. /42
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...NONE.
WWW.WEATHER.GOV/PORTLAND
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