293
FXUS66 KPQR 251735 AAA
AFDPQR
AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PORTLAND OR
1035 AM PDT TUE AUG 25 2026
UPDATED AVIATION DISCUSSION
SYNOPSIS
A WEAK UPPER LEVEL DISTURBANCE WILL BRING SLIGHTLY
COOLER HIGH TEMPERATURES IN THE MID TO UPPER 80S ACROSS THE
INTERIOR LOWLANDS. SOUTHERLY WINDS ARE EXPECTED AS TROUGHING
SETS UP OVER THE NORTHEAST PACIFIC. TEMPERATURES CONTINUE TO
TREND COOLER INTO THE WEEKEND WITH MID TO UPPER 70S POSSIBLE
SATURDAY.
SHORT TERM...NOW THROUGH WEDNESDAY NIGHT
TROUGHING OVER THE
GULF OF ALASKA IS EXPECTED TO SLOWLY DRIFT SOUTHEAST WHILE A
SHORTWAVE OVER THE NORTHEAST PACIFIC GETS SWUNG TOWARD THE PACNW
TODAY. THIS WILL LOWER HEIGHTS ALOFT AND IN TURN, DECREASE 850
MB TEMPERATURES TO AROUND 16-18 C BUT WILL STILL SUPPORT HIGH
TEMPERATURES IN THE MID TO UPPER 80S ACROSS THE INTERIOR
LOWLANDS AND 60S ALONG THE COAST. WINDS WILL ALSO SHIFT ONSHORE
ACROSS THE ENTIRE AREA. WINDS SHIFT TO THE WEST BY THE EVENING,
BRINGING A STRONG MARINE PUSH TO THE COAST AND EVENTUALLY THE
INTERIOR VALLEYS LATER TONIGHT. ANY LINGERING WILDFIRE SMOKE
SHOULD SHIFT BACK EAST OF THE CASCADES BY WEDNESDAY.
THE UPPER LEVEL TROUGH OVER THE NORTHEAST PACIFIC WILL SLOWLY
SHIFT EASTWARD TOWARD THE PACNW HEADING INTO WEDNESDAY. UPPER
LEVEL HEIGHTS WILL CONTINUE TO DROP AS THE CENTER OF THE TROUGH
MOVES TOWARD VANCOUVER ISLAND. WEDNESDAY LIKELY STARTS OUT WITH
MARINE STRATUS COVERING THE INTERIOR LOWLANDS WHICH WILL ALSO
IMPACT AFTERNOON HIGHS WHICH ARE EXPECTED TO TOP OUT IN THE LOW
80S ACROSS THE INTERIOR. -19
LONG TERM...WEDNESDAY THROUGH SUNDAY
CONFIDENCE REMAINS HIGH
HEADING INTO THE LATTER HALF OF THE WEEK AND INTO THE WEEKEND.
CLUSTER ANALYSIS IS HEAVILY FAVORING TROUGHING OVER THE PACNW
AND WESTERN CANADA WITH SEVERAL EMBEDDED IMPULSES REINFORCING
THIS PATTERN FOR SEVERAL DAYS. TEMPERATURES CONTINUE TO TREND
DOWNWARD INTO THE WEEKEND. MODELS CONTINUE TO SHOW ONLY WEAK
SIGNALS FOR PRECIPITATION WITH A CHANCE COMING ON THURSDAY AS A
FRONT MOVES THROUGH THE AREA AND A BETTER SHOT ON SATURDAY AS A
SLIGHTLY STRONGER FRONT IS EXPECTED. BEYOND SATURDAY, THE UPPER
LEVEL PATTERN BEGINS TO FLATTEN OUT AND TEMPERATURES WARM BACK
INTO THE 80S. -19
AVIATION...THROUGH 18Z WEDNESDAY
DRY, SOUTHWEST FLOW ALOFT
TODAY AS UPPER LEVEL RIDGE OF HIGH PRESSURE SHIFTS EAST. SATELLITE
IMAGERY THIS MORNING SHOWS MARINE STRATUS ENTRENCHED ALONG THE
COAST, SLOWLY RETREATING FROM THE COAST RANGE VALLEYS. WILDFIRE
SMOKE FROM THE AUSTIN FIRE HAS BEEN STREAMING ALOFT OVER PDX, BUT
IS EXPECTED TO SHIFT FARTHER EAST LATER THIS AFTERNOON AS A STRONG
MARINE PUSH OF WESTERLY WINDS ARRIVES. EXPECT A MIX OF MVFR TO IFR
CIGS TO PERSIST ALONG THE COAST MUCH OF THE DAY. THERE IS AROUND A
60% CHANCE OF CONDITIONS IMPROVING TO VFR AT KAST BRIEFLY THIS
AFTERNOON BETWEEN 21-00Z. VFR EXPECTED ACROSS INLAND TERMINALS
THROUGH AT LEAST 10Z WEDNESDAY. THERE IS AROUND A 30-50% CHANCE
THAT MARINE STRATUS WITH MVFR CIGS PUSHES INLAND AFTER 12-14Z WED
MORNING. EXPECT SOUTHWEST WINDS TO BECOME SLIGHTLY MORE WESTERLY
THIS AFTERNOON BEFORE EASING LATER THIS EVENING.
KPDX AND APPROACHES...VFR CONDITIONS EXPECTED WITH SMOKE ALOFT
GRADUALLY DRIFTING EASTWARD THIS AFTERNOON. WITH A STRONGER
MARINE PUSH TONIGHT, MARINE STRATUS COULD PUSH INLAND WITH AROUND
A 30-50% CHANCE OF MVFR CIGS AFTER 14Z WEDNESDAY. SSW WINDS AROUND
4-7 KT EXPECTED TO BECOME WESTERLY AFTER 22Z. /DH
MARINE
WINDS SHIFT TO THE SOUTH AS A WEAK DISTURBANCE PASSES
OVER THE REGION. WINDS ACROSS MUCH OF THE WATERS EXPECTED TO BE
5-15 KT WITH GUSTS UP TO 20 KT WITHIN 20 NM OF THE COAST. THE
NOTABLE EXCEPTION WILL BE THE INNER WATERS NORTH OF CAPE
FALCON NORTH TO CAPE SHOALWATER WHERE WINDS ARE EXPECTED TO BE
15-20 KT WITH GUSTS TO 25 KT LATE THIS MORNING THROUGH THE
EVENING. A SMALL CRAFT ADVISORY HAS BEEN ISSUED FOR ZONE PZZ251
AND THE COLUMBIA RIVER BAR FROM 10 AM TO 7 PM TODAY. ISOLATED
SCA CRITERIA GUSTS ARE POSSIBLE OUTSIDE THE ADVISORY.
THE NEXT PATTERN SHIFT LOOKS TO OCCUR THURSDAY NIGHT INTO FRIDAY,
WHEN TROUGHING MOVES INTO THE PACIFIC NORTHWEST. THIS WILL BRING A
RETURN TO NORTHWESTERLY FLOW WITH LOW TO MODERATE CHANCES FOR
LIGHT RAIN SHOWERS. SEAS OTHERWISE CONTINUE AT 3-6 FT THROUGH THIS
WEEKEND. -19/36
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...SMALL CRAFT ADVISORY UNTIL 7 PM PDT THIS EVENING FOR PZZ210-251.
WWW.WEATHER.GOV/PORTLAND
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSPORTLAND
X.COM/NWSPORTLAND
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