125
FXUS66 KPQR 262044
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
144 PM PDT WED AUG 26 2026
SYNOPSIS
A COOL AND INCREASINGLY UNSETTLED PATTERN WILL
CONTINUE THROUGH THE END OF THE WEEK AS UPPER-LEVEL TROUGHING
SETTLES OVER THE PACIFIC NORTHWEST. PERIODIC MARINE PUSHES AND
WEAK FRONTAL PASSAGES WILL BRING INCREASING CLOUD COVER AND LOW
CHANCES FOR PRECIPITATION, WITH THE BEST OPPORTUNITIES ALONG THE
COAST AND HIGHER TERRAIN. TEMPERATURES MAY BRIEFLY REBOUND
SUNDAY, ALTHOUGH UNCERTAINTY INCREASES INTO EARLY NEXT WEEK.
DISCUSSION...NOW THROUGH TUESDAY
UPPER-LEVEL TROUGHING OVER THE
NORTHEAST PACIFIC CONTINUES TO SHIFT NORTHEASTWARD TOWARDS
BRITISH COLUMBIA, WITH COOLER AIR GRADUALLY SPREADING INTO THE
PACIFIC NORTHWEST. THIS ONSHORE WIND PATTERN RESULTED IN MARINE
STRATUS FUNNELING INTO THE INTERIOR LOWLANDS EARLY THIS MORNING,
BUT HAS ALREADY BURNED OFF INLAND AS OF NOON, LEAVING JUST
BROKEN STRATUS ALONG THE COAST. TEMPERATURES WILL REMAIN NEAR
SEASONAL NORMS TODAY, WITH HIGHS IN THE LOW 80S INLAND AND 60S
ALONG THE COAST.
ANOTHER SURGE OF MARINE STRATUS IS EXPECTED TONIGHT INTO
THURSDAY MORNING AS ONSHORE FLOW STRENGTHENS. A SHORTWAVE
EMBEDDED WITHIN THE BROADER TROUGH WILL MOVE ACROSS THE REGION
THURSDAY MORNING, ACCOMPANIED BY A WEAK FRONTAL BOUNDARY.
PRECIPITATION CHANCES REMAIN HIGHEST ALONG THE COAST AND COAST
RANGE, GENERALLY 10 TO 30 PERCENT, WITH LOCALLY HIGHER CHANCES
OF 30 TO 40 PERCENT ACROSS PACIFIC COUNTY. ELSEWHERE, MEASURABLE
PRECIPITATION CHANCES REMAIN 5 PERCENT OR LESS. COOLER AIR
ACCOMPANYING THE DISTURBANCE WILL LOWER INTERIOR HIGHS INTO THE
MID TO UPPER 70S THURSDAY, WHILE COASTAL LOCATIONS REMAIN IN THE
60S. LITTLE CHANGE IS EXPECTED FRIDAY AS THE UPPER TROUGH
REMAINS IN PLACE. CONTINUED ONSHORE FLOW WILL FAVOR ANOTHER
ROUND OF MORNING MARINE STRATUS, WITH AFTERNOON TEMPERATURES
REMAINING IN THE MID TO UPPER 70S ACROSS THE INTERIOR.
A REINFORCING DISTURBANCE MAY BRING A BETTER OPPORTUNITY FOR
PRECIPITATION SATURDAY, PARTICULARLY ACROSS AREAS NORTH OF
SALEM. CURRENT ENSEMBLE PROBABILITIES FOR MEASURABLE RAINFALL
ARE AROUND 15 TO 30 PERCENT, ALTHOUGH CONSIDERABLE UNCERTAINTY
REMAINS REGARDING THE STRENGTH AND TRACK OF THIS FEATURE.
TEMPERATURES SHOULD REMAIN ON THE COOL SIDE, WITH HIGHS
GENERALLY IN THE MID 70S.
THE UPPER-LEVEL PATTERN BEGINS TO FLATTEN DURING SUNDAY, WHICH
SHOULD ALLOW TEMPERATURES TO GRADUALLY RECOVER TOWARD THE UPPER
70S TO MAYBE 80. HOWEVER, ENSEMBLE GUIDANCE CONTINUES TO SHOW
CONSIDERABLE SPREAD HEADING INTO EARLY NEXT WEEK, WITH SOME
SOLUTIONS FAVORING RENEWED TROUGHING AND PRECIPITATION WHILE
OTHERS MAINTAIN A MORE PROGRESSIVE AND DRIER PATTERN. CONFIDENCE
THEREFORE REMAINS RELATIVELY LOW BEYOND THE WEEKEND, WHERE HIGH
TEMPERATURES COULD REACH ANYWHERE BETWEEN 70 AND 80 DEGREES.
~12
AVIATION...THROUGH 21Z THURSDAY
SOUTHWEST FLOW ALOFT CONTINUES
TODAY AS AN UPPER LEVEL TROUGH PERSISTS OFFSHORE. SKIES HAVE
CLEARED ACROSS INLAND LOCATIONS WITH VFR PERSISTING THROUGH THIS
EVENING. THERE IS A 70-80% CHANCE OF STRATUS RETREATING OFF THE
COAST WITH VFR CONDITIONS POSSIBLE THROUGH 00-03Z THU. MARINE
STRATUS IS EXPECTED TO PUSH BACK ONSHORE THIS EVENING, WITH MVFR
CIGS MOST LIKELY. THERE IS HIGH CONFIDENCE THAT STRATUS WILL BACK
BUILD OFF THE CASCADES LATER TONIGHT WITH CHANCES FOR MVFR CIGS
REACHING TERMINALS INCREASING AFTER 09Z THU TO AROUND 30-60%,
HIGHEST NEAR KEUG AND KTTD. SOUTHWEST WINDS AROUND 5-10 KT VEER
MORE WESTERLY THIS EVENING, BEFORE EASING OVERNIGHT.
KPDX AND APPROACHES...VFR CONDITIONS EXPECTED THROUGH AT LEAST
10Z THU. STRATUS LIKELY RETURNS EARLY THURSDAY MORNING WITH AROUND
A 30-50% CHANCE FOR MVFR CIGS AFTER 11Z THU. LIGHT WINDS ARE
EXPECTED TO BECOME WESTERLY AROUND 5-7 KT THIS AFTERNOON. /DH
MARINE
LOW PRESSURE CENTERED 300 MILES WEST OF THE WASHINGTON
COAST WILL CONTINUE TO TRACK TOWARD VANCOUVER ISLAND THROUGH
THURSDAY. SOUTHERLY WINDS WILL CONTINUE ACROSS THE COASTAL WATERS,
GENERALLY AROUND 10-15 KT. A WEAK FRONT WILL MOVE ACROSS THE
WATERS THURSDAY MORNING BRIEFLY INCREASING SOUTHERLIES UP TO 20
KT. COULD SEE A BRIEF PERIOD OF ISOLATED GUSTS UP TO 25 KT ACROSS
THE INNER WATERS NORTH OF CAPE FALCON AND AROUND THE COLUMBIA
RIVER BAR BETWEEN 8 AM AND 2 PM.
HIGH PRESSURE BEGINS TO REBUILD OVER THE WATERS LATER THURSDAY
INTO FRIDAY RETURNING NORTH TO NORTHWEST WINDS ACROSS THE COASTAL
WATERS INTO THE WEEKEND. PREDOMINATELY WIND DRIVEN SEAS ARE
EXPECTED TO REMAIN AROUND 3 TO 6 FT THROUGH THE WEEKEND. SOMEWHAT
MORE ACTIVE PATTERN MAY RETURN EARLY NEXT WEEK. /DH
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...NONE.
WWW.WEATHER.GOV/PORTLAND
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