799
FXUS66 KPQR 221711 AAA
AFDPQR
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PORTLAND OR
1011 AM PDT SAT AUG 22 2026
UPDATED AVIATION DISCUSSION
SYNOPSIS
LOW PRESSURE MOVING OVER THE AREA WILL SEND A WEAK
COLD FRONT THROUGH THE AREA TODAY. EXPECT NEAR AVERAGE
TEMPERATURES TODAY AND TOMORROW. CHANCE FOR LIGHT RAIN SHOWER
ALONG THE COAST, COAST RANGE AND NORTH OF THE WA/OR BORDER.
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 FRIDAY
AN UPPER LEVEL TROUGH WILL
CONTINUE TO PROGRESS NORTHEAST TODAY, SENDING A WEAK COLD FRONT
THROUGH THE AREA EARLY SATURDAY. THIS WILL SUPPORT TEMPERATURES
NEAR OR SLIGHTLY BELOW AVERAGE BOTH TODAY AND SUNDAY IN THE
UPPER 70S TO LOW 80S ACROSS THE INTERIOR LOWLANDS. SURFACE
PRESSURE GRADIENTS TIGHTEN AS THE COLD FRONT MOVES THROUGH,
SUPPORTING RELATIVELY GUSTY WINDS UP TO 20 MPH INLAND AND UP TO
25 MPH ALONG THE COAST. STRONGEST WINDS EXPECTED THROUGH THE
WESTERN COLUMBIA RIVER GORGE WHERE GUSTS AROUND 30 MPH ARE
EXPECTED WITH A 30-40% CHANCE FOR ISOLATED GUSTS AROUND 35 MPH
SATURDAY AFTERNOON. THERE IS ALSO A CHANCE FOR LIGHT SHOWERS
THIS EVENING AND OVERNIGHT AS THE TROUGH AXIS PASSES OVERHEAD.
BEST CHANCES FOR ANY PRECIPITATION WILL BE ALONG THE COAST AND
COAST RANGE AND ALONG AND NORTH OF THE WA/OR BORDER. MOST LIKELY
TIMING IS BETWEEN 5 PM SATURDAY THROUGH 5 AM SUNDAY.
ZONAL FLOW ALOFT DEVELOPS SUNDAY AS THE UPPER LEVEL TROUGH CONTINUES
TO TREK NORTHEAST AWAY FROM THE REGION. LOOKING AHEAD INTO EARLY
NEXT WEEK, ENSEMBLE CLUSTERS FAVOR RIDGING OVER THE CENTRAL CONUS
AND THE PACNW. WARMER TEMPERATURE ARE EXPECTED TO RETURN FOR MONDAY
AND TUESDAY. MODEL SPREAD FOR HIGH TEMPERATURES BETWEEN THE 10TH-
90TH PERCENTILES RANGE FROM THE LOW 80S TO LOW 90S FOR THE INTERIOR
LOWLANDS. CLUSTERS FAVOR ANOTHER TROUGH INFLUENCING THE REGION BY
THE MIDDLE OF THE WEEK BUT EXACT TIMING AND UPPER LEVEL PATTERN ARE
UNCERTAIN BUT ONSHORE FLOW AND SEASONABLE OR BELOW AVERAGE
TEMPERATURES WOULD BE FAVORED. CURRENTLY, THE 10TH-90TH PERCENTILES
RANGE FROM THE LOW 70S TO LOW 80S. THERE IS ALSO NO CLEAR SIGNAL FOR
ANY PRECIPITATION ASSOCIATED WITH THE MID WEEK TROUGH. APPROXIMATELY
20-30% OF MEMBERS SHOW VERY LIGHT RAIN POSSIBLE DURING THE THURSDAY-
FRIDAY TIMEFRAME BUT NOTHING SIGNIFICANT AT THIS TIME. -19
AVIATION...THROUGH 18Z SUNDAY
AN UPPER-LEVEL LOW CURRENTLY
OFFSHORE WILL CONTINUE MOVING NORTH/NORTHEAST THROUGH THE TAF
PERIOD. THIS LOW HAS RESULTED IN WIDESPREAD MVFR CONDITIONS AND
SOUTHERLY WINDS ACROSS THE AIRSPACE. WHILE THE SOUTHERLY WINDS ARE
EXPECTED TO PERSIST, THE MVFR MARINE STRATUS INLAND IS EXPECTED TO
BURN OFF OVER THE NEXT FEW HOURS AND BRING VFR CONDITIONS TO ALL
INLAND LOCATIONS THROUGH AT LEAST 04Z-06Z SUNDAY. AFTERWARDS,
MVFR CONDITIONS ARE EXPECTED TO RETURN ACROSS ALL INLAND
LOCATIONS.
COASTAL LOCATIONS WILL MAINTAIN WIDESPREAD IFR/LOW-END MVFR
CONDITIONS THROUGH THE TAF PERIOD. THERE IS A LOW PROBABILITY
(10-20%) THAT BRIEF PERIODS OF VFR CONDITIONS COULD OCCUR ALONG
THE COAST FROM AROUND 22Z SATURDAY THROUGH 00Z SUNDAY. GUSTS
APPROACHING 25 KT EXPECTED ALONG THE COAST FROM AROUND 20Z
SATURDAY THROUGH AROUND 06Z SUNDAY.
KPDX AND APPROACHES...MVFR CONDITIONS WILL IMPROVE TOWARDS VFR
THROUGH 20Z SATURDAY. SOUTHERLY WINDS EXPECTED TO PERSIST THROUGH
THE TAF PERIOD. AROUND 05Z-08Z MVFR CONDITIONS ARE EXPECTED TO
RETURN AND PERSIST THROUGH THE REMAINDER OF THE TAF PERIOD. /42
MARINE
SOUTH TO SOUTHWEST WINDS CONTINUE TODAY AS A LOW
PRESSURE SYSTEM MOVES OVER THE NORTHEAST PACIFIC. A COLD FRONT
MOVES THROUGH SATURDAY, BRINGING A 50-80% CHANCE FOR MAXIMUM WIND
GUSTS TO EXCEED 21 KT FOR THE INNER WATERS, INCLUDING THE
COLUMBIA RIVER BAR. AS A RESULT, A SMALL CRAFT ADVISORY HAS BEEN
ISSUED FOR THE INNER WATERS FROM 5 AM TO 5 PM SATURDAY AND FOR THE
COLUMBIA RIVER BAR FROM 11 AM TO 5 PM SATURDAY. FOR THE OUTER
WATERS, CHANCES ARE 20-50% WITH THE HIGHEST VALUES OF THAT RANGE
BETWEEN 10 AND 30 NM.
HIGH PRESSURE AND NORTHERLY WINDS RETURN BY SUNDAY, WITH A 40-70%
CHANCE FOR NORTHERLY WIND GUSTS TO EXCEED 21 KTS IN THE EVENING
AND CONTINUING INTO MONDAY. SEAS OF 4-6 FT PERSIST THROUGH THE
PERIOD.~12
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...SMALL CRAFT ADVISORY UNTIL 5 PM PDT THIS AFTERNOON FOR PZZ210.
SMALL CRAFT ADVISORY UNTIL 5 PM PDT THIS AFTERNOON FOR
PZZ251>253.
WWW.WEATHER.GOV/PORTLAND
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