499
FXUS66 KPQR 022152
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
251 PM PDT WED JUL 2 2025
SYNOPSIS
ONSHORE FLOW RETURNS TODAY WHICH WILL BRING IN
COOLER AND MORE MOIST AIR. STRONGER WESTERLY FLOW WILL CAUSE
WINDS TO INCREASE IN THE COLUMBIA RIVER GORGE AND UPPER HOOD RIVER
VALLEY THROUGH TODAY. NEAR-SEASONAL TEMPERATURES CONTINUE THROUGH
THE WEEKEND WITH WARMER CONDITIONS POSSIBLE NEXT WEEK.
DISCUSSION...WEDNESDAY AFTERNOON THROUGH TUESDAY
A WEAK
UPPER TROUGH AND ASSOCIATED SURFACE COLD FRONT ARE APPROACHING NW
OREGON AND SW WASHINGTON TUESDAY AFTERNOON. THIS HAS PUSHED HIGH
PRESSURE TO THE EAST, ALLOWING TEMPERATURES TO FALL MUCH LOWER THAN
PREVIOUS DAYS. TEMPERATURE OBSERVATIONS AT 2 PM PDT RANGE FROM 5 TO
15 DEGREES COOLER THAN 24 HOURS AGO, AND HIGH TEMPERATURES ARE
FORECAST TO PEAK IN THE UPPER 70S TO LOW 80S ACROSS THE WILLAMETTE
VALLEY. GUIDANCE SHOWS THIS UPPER TROUGH AXIS WILL REMAIN SITUATED
JUST OFFSHORE OF THE WEST COAST THROUGH TOMORROW, THOUGH THE COLD
FRONT WILL MOVE INLAND TONIGHT, BREAKING UP AS IT MOVES THROUGH THE
REGION. NO IMPACTS ARE EXPECTED WITH THIS FRONT EXCEPT FOR
TEMPERATURES COOLING ANOTHER FEW DEGREES TOMORROW, BACK TO SEASONAL
NORMAL FOR EARLY JULY OF UPPER 70S TO 80 DEGREES ACROSS THE
WILLAMETTE VALLEY. ENSEMBLES ARE IN GOOD AGREEMENT THAT THE UPPER
TROUGH WILL MOVE INLAND TOMORROW NIGHT INTO FRIDAY MORNING. THIS
COULD PRODUCE A FEW LIGHT SHOWERS OVER THE LANE COUNTY CASCADES
DURING THIS TIME PERIOD. AT THIS POINT, UNCERTAINTY IS TOO LOW TO
DETERMINE IF THERE'S ENOUGH INSTABILITY FOR THUNDERSTORM FORMATION
WITH THESE SHOWERS, BUT WILL BE MONITORING THE FORECAST FOR THIS
POSSIBILITY. TEMPERATURES FRIDAY WILL BE ANOTHER FEW DEGREES COOLER,
TOPPING OUT IN THE MID TO UPPER 70S INLAND.
ENSEMBLE GUIDANCE INDICATES EITHER MORE ZONAL FLOW OR VERY WEAK
TROUGHING OVER THE PACNW SATURDAY INTO MONDAY, WHICH WILL ALLOW FOR
INLAND TEMPERATURES TO INCREASE A FEW DEGREES EACH DAY BACK INTO THE
MID TO UPPER 80S BY MONDAY. BY TUESDAY, 90% OF GFS, EURO, AND
CANADIAN ENSEMBLE MEMBERS INDICATE HIGH PRESSURE OVER THE DESERT
SOUTHWEST WILL AGAIN PUSH NORTH INTO THE PACNW. THIS WOULD PUSH
DAYTIME TEMPERATURES BACK INTO THE 90S INLAND ON TUESDAY, POSSIBLY
CONTINUING LATER IN THE WEEK. THERE'S SOME UNCERTAINTY IN EXACT
NUMBERS, BUT THE SPREAD BETWEEN NBM 25TH PERCENTILE AND 75TH
PERCENTILE VALUES KEEPS TEMPERATURES SOMEWHERE IN THE 90S.
ADDITIONALLY, NBM INDICATES A 30-60% CHANCE OF TEMPERATURES REACHING
OR EXCEEDING 95 DEGREES ON TUESDAY. -HEC
AVIATION
MORNING MARINE STRATUS HAS ALREADY BURNED OFF, WITH A
FEW SCATTERED CLOUDS AROUND 4000 FT AGL. THE NORTHERN
OREGON/SOUTHERN WASHINGTON COAST IS STILL SEEING PERSISTENT STRATUS
CLOUDS THAT LIKELY CAUSE MVFR CONDITIONS TO PERSIST THROUGHOUT THE
PERIOD. WINDS CURRENTLY NORTHWESTERLY AND GUSTING TO 15-18 KTS FOR
ALL TERMINALS. THESE WILL DROP BELOW 10 KT BY 4Z THU OR SO.
PDX AND APPROACHES...VFR THROUGHOUT THE PERIOD. GUSTS OF UP TO 18-20
KTS ARE POSSIBLE WEDNESDAY AFTERNOON UNTIL AROUND 5Z THU. WINDS
BELOW 8 KTS AFTERWARDS. /JLIU
MARINE
PERSISTENT SURFACE HIGH PRESSURE OFFSHORE WILL RESULT IN
CONTINUED NORTH TO NORTHWESTERLY WINDS ACROSS THE WATERS. DIURNAL
GUSTS WILL REACH 10-15 KT NORTH OF CAPE FALCON AND 15-20 KT FROM
CAPE FALCON TO FLORENCE EACH AFTERNOON, EASING TO AROUND 10 KT
OVERNIGHT. SEAS WILL CONTINUE AT 3-6 FT THROUGH THE WEEKEND.
STRENGTHENING SURFACE HIGH PRESSURE WILL THEN SEE WINDS AND SEAS
BUILD SUNDAY INTO NEXT WEEK. -PICARD
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...NONE.
WWW.WEATHER.GOV/PORTLAND
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSPORTLAND
X.COM/NWSPORTLAND
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