446
FXUS66 KPQR 231052
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
352 AM PDT SUN AUG 23 2026
SYNOPSIS
LOW PRESSURE MOVING OVER THE AREA WILL SEND A WEAK
COLD FRONT THROUGH THE AREA TONIGHT. EXPECT NEAR AVERAGE DAYTIME
HIGHS THROUGH THE WEEK. RIDGING BUILDS BACK INTO THE AREA EARLY
NEXT WEEK, INCREASING TEMPERATURES BACK INTO THE MID TO UPPER
80S ACROSS THE INTERIOR LOWLANDS.
DISCUSSION...TODAY THROUGH SATURDAY
UPPER LEVEL TROUGHING
CONTINUES TO MOVE NORTHEAST TOWARD SOUTHWESTERN CANADA. THIS IS
SUPPORTING LIGHT, SCATTERED SHOWERS OVER SOUTHWESTERN WASHINGTON
AND THE COAST RANGE EARLY THIS MORNING. RADAR INDICATES SHALLOW
RETURNS OVER THE AREA AND SURFACE OBSERVATIONS REPORT RAINFALL
TOTALS OF A FEW HUNDREDTHS. SHOWERS ARE EXPECTED TO DISSIPATE BY
LATE THIS MORNING AS ZONAL FLOW DEVELOPS IN THE WAKE OF THE
UPPER LEVEL TROUGH. HIGHS WILL AGAIN BE AROUND TO A FEW DEGREES
BELOW AVERAGE IN THE UPPER 70S TO LOW 80S FOR INTERIOR LOWLANDS.
WINDS SHIFT FROM SOUTHERLY TO NORTHERLY AS SURFACE HIGH
PRESSURE BUILDS INTO THE AREA.
HEADING INTO THE WORK WEEK, ENSEMBLE CLUSTERS FAVOR RIDGING OVER THE
CENTRAL CONUS AND THE PACNW. WARMER TEMPERATURE ARE EXPECTED TO
RETURN FOR MONDAY AND TUESDAY. MODEL SPREAD HAS DECREASED FOR HIGH
TEMPERATURES BETWEEN THE 10TH-90TH PERCENTILES NOW RANGING FROM THE
UPPER 80S TO LOW 90S ON MONDAY AND MID 80S TO LOW 90S FOR TUESDAY
FOR THE INTERIOR LOWLANDS. CLUSTERS THEN FAVOR ANOTHER TROUGH
INFLUENCING THE REGION BY THE MIDDLE OF THE WEEK BUT EXACT TIMING
AND PLACEMENT ARE UNCERTAIN BUT ONSHORE FLOW AND SEASONABLE OR BELOW
AVERAGE TEMPERATURES WOULD BE FAVORED. CURRENTLY, THE 10TH-90TH
PERCENTILES RANGE FROM THE MID 70S TO LOW 80S. AN INCREASING NUMBER
OF ENSEMBLE MEMBERS INDICATE THAT LIGHT PRECIPITATION IS POSSIBLE
DURING THE THURSDAY-FRIDAY TIMEFRAME BUT NOTHING SIGNIFICANT AT THIS
TIME. -19
AVIATION...12Z TAFS
AN UPPER-LEVEL LOW CONTINUES TO SLOWLY
MOVE NORTHEAST, SUPPORTING LOW AND MID-LEVEL CLOUDS OVER THE
REGION. CURRENT OBSERVATIONS HAVE VFR CONDITIONS INLAND WITH CIGS
GENERALLY BETWEEN 4000-5000 FT AND A MIX OF SUB-VFR CONDITIONS
ALONG THE COAST. GUIDANCE CONTINUES TO SHOW LOWERING CIGS INLAND
AFTER 14-16Z WITH MVFR CLOUD COVER AROUND 2000-3000 FEET EXPECTED.
FLIGHT CONDITIONS EXPECTED TO IMPROVE STARTING AROUND 18Z-20Z FOR
ALL TERMINALS, WITH VFR CONDITIONS RETURNING BY THE AFTERNOON.
SOUTH/SOUTHWEST WINDS WILL CONTINUE THROUGH AT LEAST 17Z-19Z,
SHIFTING TO THE NORTHWEST THEREAFTER. NORTHERLY GUSTS APPROACHING
25 KT EXPECTED ALONG THE COAST STARTING AROUND 18Z AND WILL
PERSIST THROUGH THE REMAINDER OF THE TAF PERIOD.
KPDX AND APPROACHES...VFR CONDITIONS WILL LOWER TOWARDS MVFR
AROUND 15-16Z. SOUTHERLY WINDS EXPECTED TO PERSIST THROUGH AROUND
18Z-20Z WITH NORTHERLY WINDS THEREAFTER. VFR CONDITIONS ARE ALSO
EXPECTED TO RETURN AROUND THE SAME TIME PERIOD. -19/42
MARINE
NORTHERLY WINDS INCREASE AS HIGH PRESSURE STRENGTHENS
OVER THE NORTHEAST PACIFIC. GUSTY WINDS WILL DEVELOP OVER THE
WATERS, INCREASING FROM SOUTH TO NORTH FROM FLORENCE TO CAPE
SHOALWATER. WIND GUSTS UP TO 25 KT ARE EXPECTED TO DEVELOP DURING
THE EVENING, PERSISTING THROUGH MONDAY AFTERNOON. SMALL CRAFT
ADVISORIES HAVE BEEN ISSUED STARTING AT 5 PM FOR WATERS FROM
FLORENCE NORTH TO CAPE FALCON AND STARTING AT 11 PM FOR WATERS
NORTH OF CAPE FALCON TO CAPE SHOALWATER. GUSTY WINDS ARE ALSO
EXPECTED FOR THE COLUMBIA RIVER BAR STARTING AT 8 AM MONDAY. SEAS
WILL BE CHOPPY DURING THIS TIME AT 3-6 FEET AT 7-9 SECONDS. -19
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...SMALL CRAFT ADVISORY FROM 8 AM TO 8 PM PDT MONDAY FOR PZZ210.
SMALL CRAFT ADVISORY FROM 11 PM THIS EVENING TO 8 PM PDT MONDAY
FOR PZZ251-271.
SMALL CRAFT ADVISORY FROM 5 PM THIS AFTERNOON TO 5 PM PDT MONDAY
FOR PZZ252-253-272-273.
WWW.WEATHER.GOV/PORTLAND
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSPORTLAND
X.COM/NWSPORTLAND
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