110
FXUS66 KPQR 290504 AAA
AFDPQR
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PORTLAND OR
1004 PM PDT SUN JUN 28 2026
UPDATED AVIATION DISCUSSION
SYNOPSIS
A COOL MARINE PATTERN REMAINS IN PLACE THROUGH MUCH
OF THE UPCOMING WEEK, KEEPING DAYTIME TEMPERATURES BELOW NORMAL
AND SKIES GENERALLY CLOUDIER THAN WHAT IS TYPICAL FOR LATE
JUNE. A FEW LIGHT SHOWERS WILL LINGER INTO THIS EVENING, MAINLY
OVER THE CASCADES AND NEARBY FOOTHILLS, WHILE MOST LOWLAND
LOCATIONS TREND DRIER. SHOWER CHANCES STAY LIMITED MONDAY
THROUGH WEDNESDAY, THEN INCREASE A BIT ON THURSDAY BEFORE A
GRADUAL WARMING TREND DEVELOPS HEADING INTO FRIDAY AND NEXT
WEEKEND.
DISCUSSION...NOW THROUGH SATURDAY NIGHT
THE OVERALL FORECAST
REMAINS ON TRACK THIS LATE AFTERNOON, WITH ONSHORE FLOW STILL
FIRMLY ESTABLISHED ACROSS NORTHWEST OREGON AND SOUTHWEST
WASHINGTON. NORTHWEST FLOW ALOFT AND A COOL MARINE AIR MASS
CONTINUE TO FAVOR BELOW AVERAGE TEMPERATURES ACROSS THE AREA,
AND THAT GENERAL SETUP IS NOT EXPECTED TO CHANGE MUCH THROUGH
FRIDAY. FOR MOST OF THE COMING WEEK, HIGHS SHOULD TOP OUT IN THE
MID 60S TO LOW OR MID 70S (COOLEST AT THE COAST AND MILDEST
ACROSS THE WILLAMETTE VALLEY AND PORTLAND METRO).
CLOUD COVER HAS BEHAVED MUCH AS EXPECTED TODAY, WITH EXTENSIVE
LOW CLOUDS DURING THE MORNING GRADUALLY GIVING WAY TO AT LEAST
PARTIAL AFTERNOON CLEARING IN SOME SPOTS. THIS PATTERN OF
MOSTLY CLOUDY NIGHTS AND MORNINGS FOLLOWED BY OCCASIONAL
AFTERNOON BREAKS SHOULD CONTINUE THROUGH MUCH OF THE WORK WEEK.
AS FOR PRECIPITATION, SHOWER COVERAGE HAS DIMINISHED COMPARED
TO SATURDAY, AND MUCH OF THE LOWLANDS WILL REMAIN DRY FOR TODAY.
THE MAIN EXCEPTION CONTINUES TO BE THE CASCADES AND CASCADE
FOOTHILLS, WHERE MOIST UPSLOPE FLOW IS HELPING MAINTAIN THE
BEST CHANCE FOR OCCASIONAL LIGHT SHOWERS INTO THIS EVENING.
AMOUNTS REMAIN LIGHT, AND NO MEANINGFUL RAINFALL IMPACTS ARE
EXPECTED.
LOOKING AHEAD TO MONDAY THROUGH WEDNESDAY, THE FORECAST
CONTINUES TO FAVOR MAINLY DRY CONDITIONS FOR THE INTERIOR
LOWLANDS, WITH ONLY SPOTTY LIGHT SHOWERS AT TIMES OVER THE
CASCADES. THURSDAY BRINGS A SLIGHT UPTICK IN SHOWER CHANCES, NOW
ONLY FOCUSED AROUND THE NORTH OREGON AND SOUTH WASHINGTON COAST
AND COAST RANGE, WHICH IS NOT SURPRISING AS THE WEAK SIGNAL FOR
MEASURABLE RAINFALL MEANS FORECASTED AMOUNTS AND LOCATION OF
RAINFALL CAN CHANGE QUICKLY. CURRENT GUIDANCE STILL SUPPORTS
ONLY LOW-END PROBABILITIES FOR PRECIPITATION. EVEN AT THESE
LOCATIONS, EXPECTED RAINFALL AMOUNTS APPEAR LIGHT.
BY FRIDAY INTO THE HOLIDAY WEEKEND, TEMPERATURES SHOULD BEGIN
TO RECOVER AS THE BROADER TROUGHING INFLUENCE WEAKENS.
CONFIDENCE REMAINS HIGHER IN A WARMING TREND THAN IN THE EXACT
MAGNITUDE OF THAT WARMING. AT THIS POINT, THE MOST LIKELY
SCENARIO IS FOR INLAND HIGHS TO CLIMB INTO THE MID TO UPPER 70S
FRIDAY AND THEN INTO THE LOWER 80S BY SATURDAY, JULY 4, WHILE
THE COAST LIKELY REMAINS IN THE 60S. DRY WEATHER IS FAVORED
DURING THAT PERIOD, BUT CONFIDENCE ON EXACT TEMPERATURES IS
STILL SOMEWHAT LIMITED GIVEN THE REMAINING MODEL SPREAD (72 TO
83 DEGREES ON FRIDAY, 75 TO 88 DEGREES ON SATURDAY). ~12
AVIATION
CURRENTLY VFR INLAND AND A MIXTURE OF MVFR/VFR ALONG
THE COAST. A WEAK UPPER LEVEL IMPULSE, AROUND 10Z-13Z MONDAY,
WILL BRING PREDOMINATELY MVFR CONDITIONS AS WELL AS A 15-20%
CHANCE OF IFR CONDITIONS ALONG THE COAST AND A 35-60% CHANCE FOR
MVFR CONDITIONS FOR INLAND LOCATIONS. AFTER 19Z-21Z MONDAY
CONDITIONS INLAND LOOK TO IMPROVE BACK TOWARDS VFR WITH CIGS
BETWEEN FL030-FL045, WITH MVFR CONDITIONS EXPECTED TO PERSIST
ALONG THE COAST WITH THESE CONDITIONS EXPECTED TO PERSIST THROUGH
THE REMAINDER OF THE TAF PERIOD. NORTH/NORTHWEST WINDS GENERALLY
5-10 KT, STRONGEST FROM 22Z MONDAY THROUGH 05Z TUESDAY. GUSTS UP
TO 20 KT POSSIBLE THROUGH THE SAME TIME PERIOD.
KPDX AND APPROACHES...VFR CONDITIONS EXPECTED THROUGH THE TAF
PERIOD. A WEAK FRONTAL PASSAGE AROUND 10Z-13Z MONDAY WILL BRING
A 35-60% CHANCE FOR MVFR CONDITIONS. AFTER 19Z-21Z MONDAY CONDITIONS
INLAND LOOK TO IMPROVE BACK TOWARDS VFR WITH CIGS BETWEEN FL030-FL045.
NORTH/NORTHWEST WINDS GENERALLY 5-10 KT WITH GUSTS UP TO 20 KT
POSSIBLE 22Z MONDAY THROUGH 05Z TUESDAY. /42
MARINE
NORTHWEST WINDS AROUND 10 TO 20 KT WITH STEEP SEAS
NEAR 7 TO 9 FT AT 9 SECONDS DRIVEN MAINLY BY A FRESH NORTHWEST
SWELL WILL CONTINUE THROUGH TONIGHT. WEAK HIGH PRESSURE BUILDS
OVER THE COASTAL WATERS ON MONDAY, HOWEVER NORTHWEST WINDS WILL
CONTINUE TO BUILD THE ONGOING NORTHWEST SWELL WITH SIGNIFICANT
WAVE HEIGHTS INCREASING TO 8 TO 12 FT. SEAS WILL BE HIGHEST
OVER THE OUTER WATERS. THERE IS A 30-50% CHANCE SIGNIFICANT
WAVE HEIGHTS WILL PEAK OVER 11 FT BEYOND 30 NM OFFSHORE ON
MONDAY, MAINLY TO THE NORTH OF CAPE FALCON. NORTHWEST WINDS AND
A FRESH NORTHWEST SWELL THEN CONTINUES TUESDAY THROUGH
WEDNESDAY, MAINTAINING STEEP SEAS AND HAZARDOUS CONDITIONS FOR
SMALL CRAFT. WINDS AND SEAS WILL EASE SIGNIFICANTLY WEDNESDAY.
GIVEN STEEP SEAS AND WIND GUSTS UPWARDS OF 20 KT, A SMALL CRAFT
ADVISORY IS IN EFFECT THROUGH TUESDAY EVENING, EXCEPT THROUGH
SUNDAY EVENING FOR THE CENTRAL AND SOUTHERN INNER WATERS WHERE
WINDS AND SEAS ARE RELATIVELY LOWER. ~12/23
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...SMALL CRAFT ADVISORY UNTIL 5 PM PDT TUESDAY FOR PZZ251-271>273.
WWW.WEATHER.GOV/PORTLAND
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