547
FXUS66 KPQR 151805 AAA
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
1103 AM PDT MON JUN 15 2026
UPDATED AVIATION DISCUSSION
SYNOPSIS
HOT TEMPERATURES REMAIN THE MAIN STORY TODAY WITH
EXTREME HEAT WARNINGS AND HEAT ADVISORIES IN EFFECT. CONDITIONS EASE
SOMEWHAT TUESDAY AS ONSHORE FLOW RETURNS, THOUGH INLAND AREAS WILL
REMAIN WARMER THAN NORMAL THROUGH THE UPCOMING WEEK.
DISCUSSION...MONDAY THROUGH SUNDAY
AS EXPECTED, SUNDAY WAS A
HOT DAY ACROSS NW OR AND SW WA WITH MANY HIGH TEMPERATURE
RECORDS BROKEN OR TIED. TEMPERATURES PEAKED IN THE MID TO UPPER
90S FOR THE INTERIOR LOWLANDS, LOW TO MID 90S ALONG THE COAST
RANGE, AND UPPER 80S TO LOW 90S ALONG THE COAST. THE HOT AIRMASS
REMAINS IN PLACE AS UPPER LEVEL HIGH PRESSURE PERSISTS OVER THE
REGION, BRINGING ANOTHER DAY OF WELL ABOVE NORMAL TEMPERATURES
TODAY. TEMPERATURE OBSERVATIONS AT 1 AM PDT SHOW MILD
TEMPERATURES. MANY LOCATIONS, SUCH AS THE PORTLAND METRO, THE
WESTERN SIDE OF THE WILLAMETTE VALLEY, THE COAST RANGE, AND THE
CASCADE FOOTHILLS REMAIN IN THE 70S. LOCATIONS OUTSIDE OF URBAN
HEAT ISLANDS, ELEVATED NORTH WINDS, OR SUBSIDENCE INVERSIONS
HAVE FALLEN INTO THE 60S AND EVEN 50S, MAINLY ALONG THE COAST
AND HIGH CASCADES. THERE ARE STILL A FEW MORE HOURS OF COOLING
TO BE HAD THIS MORNING, BUT TEMPERATURES IN THESE AREAS WILL
STILL REMAIN FAIRLY OPPRESSIVE HEADING INTO ANOTHER VERY HOT
DAY. WITH LOW TEMPERATURES WARMER THAN YESTERDAY, THIS COULD
ALLOW FOR DAYTIME TEMPERATURES TO RISE EVEN HIGHER THAN
YESTERDAY FOR LOCATIONS EAST OF THE COAST. INTERIOR LOWLANDS ARE
EXPECTED TO RISE INTO THE UPPER 90S WITH A 40-70% CHANCE OF
TEMPERATURES REACHING OR EXCEEDING 100 DEGREES FOR THE WESTERN
PORTLAND METRO AND NORTHERN WILLAMETTE VALLEY FROM HILLSBORO TO
SALEM. THE COAST IS EXPECTED TO BE COOLER THAN YESTERDAY,
PEAKING IN THE 70S TO LOW 80S. THIS IS BECAUSE THE SURFACE
THERMAL TROUGH THAT CAUSED THE BREEZY OFFSHORE/DOWNSLOPING WINDS
THAT ENHANCED TEMPERATURES ALONG THE COAST IS BEGINNING TO
DIMINISH, CONTINUING THROUGH THE DAY. THIS WILL CAUSE WINDS
INLAND AND ALONG THE COAST TO TURN FROM EAST/NORTHEAST TO
NORTHWEST, ALLOWING FOR COOLER MARINE AIR TO IMPACT THE COAST.
ONE THING TO NOTE THAT COULD POTENTIALLY IMPACT INLAND
TEMPERATURES IS HIGH CLOUDS INITIATED BY A SHORTWAVE MOVING
THROUGH BRITISH COLUMBIA WILL STREAM OVER THE AREA TODAY.
DEPENDING ON HOW THICK THESE CLOUDS ARE, IT COULD PREVENT
TEMPERATURES FROM RISING QUITE AS HOT AS EXPECTED, THOUGH STILL
EXPECT TEMPERATURES TO BE AT LEAST AS HOT AS YESTERDAY. HOWEVER,
THE CLOUDS COULD ALSO KEEP TEMPERATURES EARLY THIS MORNING ON
THE WARMER SIDE AS THE CLOUDS COULD ACT AS AN INSULATOR.
EITHER WAY, THE HEAT WILL REMAIN OPPRESSIVE, ESPECIALLY IN
LOCATIONS THAT DO NOT COOL BELOW 65-70 DEGREES THIS MORNING.
MODERATE TO MAJOR HEATRISK REMAINS OVER THE REGION WEST OF THE
CASCADES, MEANING HEAT-RELATED ILLNESS BECOMES MORE LIKELY,
PARTICULARLY FOR THOSE WITHOUT EFFECTIVE COOLING, SENSITIVE
GROUPS, AND ANYONE SPENDING PROLONGED TIME OUTDOORS. CONTINUE TO
PRIORITIZE HEAT SAFETY: STAY HYDRATED, LIMIT STRENUOUS
AFTERNOON ACTIVITY, USE AIR- CONDITIONED SPACES WHEN POSSIBLE,
AND CHECK ON VULNERABLE NEIGHBORS, FAMILY, AND PETS. ALSO
REMEMBER RIVERS AND LAKES REMAIN COLD DESPITE THE HOT WEATHER,
INCREASING THE RISK OF COLD-WATER SHOCK FOR ANYONE SEEKING
RELIEF NEAR THE WATER.
ANOTHER SHORTWAVE MOVING THROUGH BRITISH COLUMBIA LATE TONIGHT
INTO TUESDAY WILL WEAKEN THE HIGH PRESSURE OVER THE PACNW
(THOUGH THE AXIS REMAINS OVER THE E PACIFIC) AND BREAK DOWN THE
SURFACE THERMAL TROUGH. THIS WILL ALLOW FOR THE RETURN OF
ONSHORE FLOW AND LOWER TEMPERATURES TUESDAY INTO WEDNESDAY, A
BRIEF RESPITE FROM THE EXTREME HEAT. HOWEVER, TEMPERATURES FOR
THE INTERIOR LOWLANDS WILL STILL REMAIN ABOVE NORMAL (WHICH IS
AROUND 73-75 DEGREES) IN THE 80S. PROBABILITIES FOR TEMPERATURES
REACHING 90 DEGREES TUESDAY ARE NOW LESS THAN 10-20% AND NEARLY
ZERO FOR WEDNESDAY.
ENSEMBLE GUIDANCE IS NOW IN VERY GOOD AGREEMENT THAT TRANSIENT
HIGH PRESSURE BUILDS BACK OVER THE PACNW THURSDAY AS WEAK
TROUGHING DEVELOPS OVER THE PACIFIC. THIS HIGH PRESSURE IS
EXPECTED TO WARM TEMPERATURES TO AROUND 90 DEGREES ON THURSDAY
WITH A 40-65% CHANCE BETWEEN SALEM AND PORTLAND. THE TROUGH
WILL MOVE INLAND SOMETIME FRIDAY INTO SATURDAY, AND WILL HAVE
LITTLE IMPACT EXCEPT FOR LOWERING TEMPERATURES BACK INTO THE
LOW TO MID 80S FOR THE WEEKEND. FRIDAY IS A LITTLE MORE
UNCERTAIN AND COULD REMAIN ON THE WARMER SIDE WITH SIMILAR
PROBABILITIES OF REACHING 90 DEGREES AS THURSDAY. NO SIGNIFICANT
COOL DOWN OR PRECIPITATION SIGNAL IS EVIDENT IN THE EXTENDED
FORECAST AT THIS TIME. -03
AVIATION
HIGH PRESSURE WILL MAINTAIN PREDOMINATELY VFR
CONDITIONS THROUGH THE TAF PERIOD WITH SCATTERED HIGH CLOUDS
ACROSS THE AREA. NORTHWEST WINDS ARE EXPECTED TO INCREASE TO 8-14
KTS WITH GUSTS UP TO 20-25 KTS ALONG THE COAST THIS AFTERNOON.
MARINE STRATUS WILL LIKELY PUSH ONSHORE NEAR KAST LATER IN THE
PERIOD AS CHANCES FOR MVFR CIGS INCREASE AFTER 12Z TUE.
IN ADDITION, TEMPERATURES BETWEEN 90 TO 100 DEGREES F ARE FORECAST
ACROSS THE WILLAMETTE VALLEY TODAY. BE AWARE OF HIGH DENSITY
ALTITUDE WHICH MAY REDUCE AIRCRAFT PERFORMANCE.
KPDX AND APPROACHES...VFR WITH SCATTERED HIGH CLOUDS THROUGH THE
TAF PERIOD. NORTHWEST WINDS ARE EXPECTED TO INCREASE TO AROUND
8-10 KT THIS AFTERNOON. /DH
MARINE
HIGH PRESSURE OFFSHORE WILL MAINTAIN THE SUMMERTIME
PATTERN THIS WEEKEND AND THROUGH MUCH OF NEXT WEEK. DIURNALLY
DRIVEN NORTHERLIES ARE EXPECTED TO PEAK EACH AFTERNOON AND
EVENING THROUGH NEXT WEEK. LIGHTER NORTH WINDS THIS MORNING WILL
INCREASE TO GUSTS UP TO 25 KTS SOUTH OF CAPE FALCON, THEN EASING
OVERNIGHT INTO TUESDAY MORNING. WINDS THEN INCREASE ACROSS ALL OF
THE WATERS TUESDAY AFTERNOON AND EVENING, WITH THIS PATTERN
CONTINUING INTO LATE WEEK. SEAS AROUND 4 TO 7 FT AT 7-10 SECONDS
ARE EXPECTED TO PERSIST THROUGH TUESDAY, DRIVEN PRIMARILY BY THE
NORTHERLY WIND CHOP. SEAS ARE EXPECTED TO BUILD TO AROUND 8 TO 10
FT WEDNESDAY INTO LATER IN THE WEEK AS A FRESH NORTHWESTERLY
SWELL BUILDS ACROSS THE WATERS. /DH/03
CLIMATE...
RECORD HIGH TEMPERATURES AND WARM LOW TEMPERATURES FOR MONDAY,
JUNE 15
HIGH TEMPERATURES: WARM LOW TEMPERATURES:
PORTLAND INT'L 95F (1966) 60F (1969)
VANCOUVER, WA 95F (1930, 1966) 62F (1961)
HILLSBORO 99F (1961) 60F (1963)
MCMINNVILLE 96F (1961) 59F (1936)
SALEM100F (1966) 59F (1931)
EUGENE 96F (1966) 60F (1961)
ASTORIA 91F (1966) 58F (1997)
PQR WATCHES/WARNINGS/ADVISORIES
OR...HEAT ADVISORY UNTIL MIDNIGHT PDT TONIGHT FOR ORZ104>108-113>119-
121>125.
EXTREME HEAT WARNING UNTIL MIDNIGHT PDT TONIGHT FOR ORZ109>112-
120.
WA...HEAT ADVISORY UNTIL MIDNIGHT PDT TONIGHT FOR WAZ202>205-208-210.
EXTREME HEAT WARNING UNTIL MIDNIGHT PDT TONIGHT FOR WAZ206-207-
209.
PZ...SMALL CRAFT ADVISORY UNTIL 5 AM PDT TUESDAY 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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