730
FXUS66 KPQR 250457 AAB
AFDPQR
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PORTLAND OR
957 PM PDT MON AUG 24 2026
UPDATED AVIATION DISCUSSION
SYNOPSIS
HIGH PRESSURE ALOFT REMAINS DOMINANT TODAY WITH
PRONOUNCED OFFSHORE FLOW ESTABLISHED ACROSS THE REGION. THIS
SETUP WILL SUSTAIN WARMTH INTO THIS EVENING, WITH HIGHS IN THE
LOW 90S ACROSS THE INTERIOR LOWLANDS AND NEAR 95 DEGREES IN THE
PORTLAND/VANCOUVER METRO. SMOKE FROM WILDFIRES MAY REACH THE
SURFACE AT TIMES ACROSS CLACKAMAS, MARION, AND MULTNOMAH
COUNTIES, AS WELL AS THE COLUMBIA GORGE AND UPPER HOOD RIVER
VALLEY. BY LATE TUESDAY, A SHORTWAVE TROUGH APPROACHES FROM THE
NORTHEAST PACIFIC, GRADUALLY WEAKENING THE OFFSHORE REGIME AND
INTRODUCING ONSHORE FLOW. THIS TRANSITION USHERS IN NOTABLY
COOLER CONDITIONS BY MIDWEEK AND INTO THE WEEKEND.
SHORT TERM...NOW THROUGH TUESDAY NIGHT
OFFSHORE FLOW PERSISTS
ON THE WESTERN CASCADES AND COAST RANGE SLOPES, REINFORCING
TEMPERATURES IN THE LOW TO MID 90S FOR INTERIOR LOWLANDS WHILE
COASTAL AREAS REMAIN THE THE UPPER 60S TO NEAR 70 DEGREES. GUSTY
OFFSHORE WINDS CONTINUE IN THE WESTERN GORGE THIS AFTERNOON
WITH GUSTS 25 TO 35 MPH, CREATING HAZARDOUS TRAVEL CONDITIONS;
THESE SHOULD DIMINISH AFTER SUNSET AS THE WEAK SURFACE BOUNDARY
MOVES THROUGH THE REGION AND OFFSHORE FLOW RETURNS.
SMOKE PLUMES FROM REGIONAL FIRES ARE NOW PRESENT ACROSS PORTIONS
OF THE CENTRAL AND NORTHERN WILLAMETTE VALLEY, THE PORTLAND
METRO AREA, AND STRETCHING INTO THE WESTERN GORGE. ANY THICK
SMOKE MAY SUPPRESS TEMPERATURE A DEGREE OR TWO IN AREAS WITH
SMOKE ALOFT, MAINLY NORTH OF SALEM. COASTAL REGIONS WILL SEE A
RETURN OF A LIGHT SEA BREEZE THIS AFTERNOON, MODERATING WINDS
THERE. OVERNIGHT, OFFSHORE FLOW RETURNS INLAND, WITH
TEMPERATURES DROPPING TO THE LOW TO MID 60S IN THE PORTLAND
METRO AND VALLEY/FOOTHILL CORRIDORS, AND TO THE MID-50S
ELSEWHERE.
TUESDAY BRINGS SLIGHTLY LOWER HEIGHTS ALOFT AS A SHORTWAVE
TROUGH NEARS THE REGION. THIS WILL NUDGE AFTERNOON HIGH
TEMPERATURES TO THE MID TO UPPER 80S ACROSS INTERIOR LOWLANDS
AND NEAR 60 DEGREES ON THE COAST. THE OFFSHORE WIND REGIME
WEAKENS AS ONSHORE BEGINS PREVAILING ACROSS ALL AREAS. BY
TUESDAY EVENING, HIGH PRESSURE OVER THE WATERS WILL DRIVE A
PRONOUNCED WESTERLY PUSH, CLEARING ANY REMAINING SMOKE EAST OF
THE CASCADES BY WEDNESDAY MORNING.
LONG TERM...WEDNESDAY THROUGH SUNDAY
MODEL GUIDANCE REMAINS
HIGHLY CONSISTENT REGARDING THE PATTERN EVOLUTION THROUGH THE
WEEKEND. MULTIPLE ENSEMBLE MEMBERS SUPPORT AN ACTIVE TROUGH
SETTLING INTO THE PACIFIC NORTHWEST, WITH SUCCESSIVE IMPULSES
REINFORCING TROUGHING THROUGH SATURDAY. THIS WILL DRIVE A SHARP
AND SUSTAINED TEMPERATURE DROP BEGINNING WEDNESDAY, WITH HIGHS
QUICKLY SLIDING FROM NEAR- AVERAGE VALUES TO THE UPPER 70S
THURSDAY AND FRIDAY, POTENTIALLY DROPPING TO THE MID 70S BY
SATURDAY.
WHILE PRECIPITATION REMAINS MODEST THIS WEEK, SATURDAY PRESENTS
THE MOST ROBUST SIGNAL FOR LIGHT RAIN AS A STRONGER IMPULSE
PASSES. WEAKEN DRIZZLE IS POSSIBLE THURSDAY MORNING WITH AN
INITIAL FRONTAL PASSAGE, BUT ORGANIZATION AND AREAL COVERAGE OF
ANY SHOWER ACTIVITY REMAIN UNCERTAIN GIVEN SIGNIFICANT MODEL
SPREAD AT THIS EXTENDED TIMEFRAME.
~12
AVIATION...THROUGH 06Z WEDNESDAY
WIDESPREAD VFR CONDITIONS
CONTINUE FOR INLAND LOCATIONS AND NORTHERLY WINDS ACROSS THE
AIRSPACE. OBSERVATIONS SHOW IFR/LIFR CONDITIONS SLOWLY MOVING
NORTHWARD ALONG THE COAST. THESE CONDITIONS ARE ALREADY IMPACTING
KONP AND ARE EXPECTED TO IMPACT KAST AROUND 10Z-12Z TUESDAY. A
SOUTHERLY WIND REVERSAL IS ALSO EXPECTED WITH SOUTHERLY WINDS
ALREADY BEING OBSERVED ALONG THE COAST. THESE SOUTHERLY WINDS
WILL ALSO ENABLE MARINE STRATUS TO INFILTRATE INTO THE SOUTHERN
WILLAMETTE VALLEY RESULTING IN MVFR CONDITIONS AT KEUG STARTING
AROUND 12Z-14Z TUESDAY. EXPECT THESE LOWERED FLIGHT LEVELS TO
PERSIST ALONG THE COAST THROUGH AT LEAST THE REMAINDER OF THE
TAF PERIOD, WITH KEUG IMPROVING BACK TOWARDS VFR AROUND 18Z
TUESDAY.
OTHERWISE, VFR CONDITIONS ARE EXPECTED TO PERSIST THROUGH THE
TAF PERIOD FOR ALL OTHER LOCATIONS. AS FOR INLAND WINDS, EXPECT
LIGHT, NORTHERLY WINDS, WITH SOUTHERLY WINDS OF 5-10 KT
DEVELOPING FOR INLAND TERMINALS FROM 12Z-20Z TUESDAY. ALSO,
COULD SEE SOME GUSTY SOUTHERLY WINDS STARTING ALONG THE COAST
AROUND 16Z-20Z TUESDAY WITH GUSTS APPROACHING 25 KT. THESE GUSTS
ARE EXPECTED TO PERSIST THROUGH AT LEAST THE REMAINDER OF THE
TAF PERIOD.
KPDX AND APPROACHES...VFR UNDER MOSTLY CLEAR SKIES THROUGH THE
TAF PERIOD. LIGHT NORTHERLY WINDS CONTINUE THROUGH THE OVERNIGHT
HOURS, BEFORE BECOMING SOUTHERLY AROUND 16Z TUESDAY. /42
MARINE
HIGH PRESSURE OFFSHORE MAINTAINS NORTHERLY WINDS ACROSS
THE WATERS. WINDS AND GUSTS WILL EASE THIS EVENING AS HIGH
PRESSURE BEGINS TO WEAKEN, WITH WINDS TURNING SOUTH-SOUTHWESTERLY
BY MIDDAY TUESDAY. LARGELY WIND-DRIVEN SEAS CONTINUE AT 2-6 FT
THROUGH TUESDAY.
SOUTHERLY FLOW AT 5-15 KT WILL THEN PERSIST ACROSS THE WATERS
THROUGH MUCH OF THE WORKWEEK. PERIODS OF WINDS TO 20 KT ALONG THE
SOUTHERN WASHINGTON AND FAR NORTHERN OREGON COASTS INCLUDING THE
MOUTH OF THE COLUMBIA ARE POSSIBLE TUESDAY AFTERNOON, HOWEVER THE
CONFIDENCE IN THE PERSISTENCE OF THESE WINDS LONG ENOUGH TO WARRANT
ANOTHER SMALL CRAFT ADVISORY IN WITHIN 10 NM FROM CAPE SHOALWATER
TO CAPE FALCON AND ACROSS THE COLUMBIA RIVER BAR ARE TOO LOW AT
THIS POINT. INTERMITTENT GUSTS TO 25 KT ARE MOST LIKELY BETWEEN 11
AM AND 8 PM PDT TUESDAY.
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. -36
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...NONE.
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