749
FXUS66 KPQR 152028
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
128 PM PDT MON JUN 15 2026
SYNOPSIS
HOT TEMPERATURES REMAIN THE MAIN STORY TODAY WITH
EXTREME HEAT WARNINGS AND HEAT ADVISORIES IN EFFECT THROUGH VERY
LATE TONIGHT. CONDITIONS COOL TOMORROW AS ONSHORE FLOW RETURNS,
THOUGH INLAND AREAS WILL REMAIN WARMER THAN NORMAL THROUGH THE
UPCOMING WEEK.
DISCUSSION...TONIGHT THROUGH SUNDAY
TEMPERATURES WILL REMAIN
ELEVATED THROUGH THE EVENING HOURS, WITH A GRADUAL COOL DOWN
EXPECTED TONIGHT. SO, WHILE WE ARE ON THE BACKSIDE OF THIS HEAT
WAVE, REMEMBER TO 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.
AS TONIGHT/TUESDAY MORNING APPROACHES, A SIGNIFICANT PATTERN
CHANGE IS EXPECTED AS A SHORTWAVE TROUGH SLIDING SOUTHWARD FROM
WESTERN CANADA, THIS WILL HELP TO USHER THE UPPER LEVEL HIGH
PRESSURE AND ASSOCIATED THERMALLY INDUCED SURFACE TROUGH FURTHER
EASTWARD OVER THE CASCADES AND INTO CENTRAL OR AND WA. THIS
PATTERN CHANGE WILL BRING A RETURN OF ONSHORE FLOW TO THE REGION
AND PROVIDE A BRIEF RESPITE FROM THE EXTREME HEAT. HOWEVER,
DAYTIME HIGHS WILL STILL REMAIN ABOVE NORMAL (LOW 60S TO MID
70S) FOR THIS TIME OF YEAR. EXPECT DAYTIME HIGHS ALONG THE COAST
IN THE MID TO UPPER 60S, LOW TO UPPER 80S INLAND AND LOW 70S TO
LOW 80S FOR THE CASCADES ON TUESDAY AND WEDNESDAY. PROBABILITIES
FOR TEMPERATURES REACHING 90 DEGREES TUESDAY ARE NOW LESS THAN
15% AND NEARLY ZERO FOR WEDNESDAY.
LOOKING TOWARDS THE LATTER PART OF THE WEEK, ENSEMBLE GUIDANCE
REMAINS IN VERY GOOD AGREEMENT THAT A WEAK, UPPER LEVEL TRANSIENT
HIGH PRESSURE SYSTEM BUILDS ALONG THE CENTRAL COAST OF WESTERN
CONUS. AT THE SAME TIME, VERY BROAD UPPER LEVEL TROUGHING
DEVELOPS ACROSS WESTERN AND CENTRAL CANADA. THIS SYNOPTIC
FORMATION LOOKS TO BRING SLIGHTLY WARMER TEMPERATURES BACK INTO
THE FORECAST FOR THE PACNW. DAYTIME HIGHS ON THURSDAY AND FRIDAY
LOOK TO BE IN THE MID 80S TO LOW 90S FOR INLAND LOCATIONS ON
THURSDAY AND FRIDAY. THIS WHILE SYSTEM LOOKS TO MOVE EASTWARD
FRIDAY INTO SATURDAY, WITH THE CANADIAN TROUGH DEVELOPING A
CUT- OFF LOW THAT WILL OVERTAKE THE EASTERN PACIFIC HIGH,
RESULTING IN COOLER TEMPERATURES FOR THE WEEKEND. OVERALL, THERE
ARE NO SIGNIFICANT COOL DOWN OR PRECIPITATION SIGNALS IN THE
EXTENDED FORECAST AT THIS TIME. /42-03
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 THROUGH THIS WEEK. DIURNALLY DRIVEN NORTHERLIES ARE
EXPECTED TO PEAK EACH AFTERNOON AND EVENING THROUGH NEXT WEEK.
NORTH WINDS WILL CONTINUE TO INCREASE THIS AFTERNOON WITH GUSTS
UP TO 25 KTS SOUTH OF CAPE FALCON, THEN EASE OVERNIGHT INTO
TUESDAY MORNING. WINDS THEN INCREASE ACROSS ALL OF THE COASTAL
WATERS LATER TUESDAY AFTERNOON AND EVENING, WITH THIS PATTERN
PERSISTING THROUGH LATE IN THE 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 FRIDAY AS A FRESH
NORTHWESTERLY SWELL BUILDS ACROSS THE WATERS. /DH
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 FROM 4 AM TO 8 AM PDT TUESDAY FOR PZZ210.
SMALL CRAFT ADVISORY FROM 5 PM TUESDAY TO 5 AM PDT WEDNESDAY FOR
PZZ251-252-271-272.
SMALL CRAFT ADVISORY UNTIL 4 AM PDT TUESDAY FOR PZZ252-272.
SMALL CRAFT ADVISORY UNTIL 5 AM PDT WEDNESDAY FOR PZZ253-273.
WWW.WEATHER.GOV/PORTLAND
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSPORTLAND
X.COM/NWSPORTLAND
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