498
FXUS66 KPQR 140439 AAA
AFDPQR
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PORTLAND OR
938 PM PDT SUN JUL 13 2025
..UPDATED AVIATION DISCUSSION AND WWA SECTION
SYNOPSIS
A HEAT ADVISORY REMAINS IN PLACE THROUGH TONIGHT
FOR MOST INTERIOR VALLEYS. EXPECT SUNNY SKIES ACROSS THE AREA
WITH MORNING MARINE STRATUS/FOG ALONG THE COAST. TEMPERATURES
COOL SLIGHTLY ON MONDAY, BUT STILL REMAIN WARM AND DRY. AN
EXTREME HEAT WATCH CONTINUES FOR SOME INTERIOR VALLEY LOCATIONS
FROM TUESDAY TO WEDNESDAY, AS AFTERNOON TEMPERATURES BETWEEN 90
TO 100 DEGREES AND LOW TEMPERATURES BETWEEN 65 AND 70 DEGREES
ARE POSSIBLE. EXTREME HEAT COULD ALSO EXTEND THROUGH THURSDAY.
SHORT TERM...TONIGHT THROUGH WEDNESDAY NIGHT
ELEVATED DAYTIME
HIGHS WILL RESULT IN WARM OVERNIGHT TEMPERATURES. SO, WILL
MAINTAIN THE HEAT ADVISORY THROUGH AT LEAST 10 PM TONIGHT.
RELATIVELY COOLER, ONSHORE FLOW IS EXPECTED AS A BROAD, UPPER
LEVEL TROUGH FROM WESTERN CANADA STARTS TO SLIDE SOUTH/SOUTHEASTWARD
INTO FAR EASTERN WASHINGTON/EASTERN OREGON. WHILE THIS WON'T
BRING ANY SIGNIFICANT WEATHER TO OUR CWA. IT WILL BRING SOME
COOLER 850 MB TEMPERATURES AROUND 14C TO 16C DEGREES. THIS
WILL RESULT IN DAYTIME HIGHS ON MONDAY INTO THE LOW TO UPPER
80S. NORTH/NORTHWEST WINDS WILL AGAIN INCREASE DURING THE
AFTERNOON AS SURFACE HIGH PRESSURE OFFSHORE AND LOW PRESSURE
EAST OF THE CASCADES INCREASES THE PRESSURE GRADIENT. EXPECT
WIND GUSTS UP TO 20-25 MPH INLAND, WHILE GUSTS UP TO 30 MPH WILL
BE POSSIBLE ALONG THE CENTRAL OREGON COAST.
AS WE MOVE INTO TUESDAY AND WEDNESDAY, HOT AND DRY DAYS ARE
BACK ON THE MENU. THE PRIMARY SYNOPTIC FEATURES WILL BE A VERY
BROAD UPPER LEVEL HIGH AND A SURFACE LOW WITHIN THE GREAT BASIN.
THE UPPER LEVEL HIGH WILL EXPAND ACROSS THE PAC NW AND EASTWARD
TOWARDS THE ROCKIES. AS THIS UPPER LEVEL HIGH STRENGTHENS IT
WILL AMPLIFY A SURFACE LOW WITHIN THE GREAT BASIN. THE LOW
WITHIN THE GREAT BASIN WILL SPREAD NORTHWARD AS WELL AS
EXPAND EAST AND WEST. THIS WILL RESULT IN VERY WARM 850 MB
TEMPERATURES AROUND 19C TO 22C TO MIX DOWN TO THE SURFACE.
HERE IS A TABLE FOR SOME LOCATIONS ACROSS OUR FORECAST AREA. IT
WILL HAVE FORECASTED HIGHS AS WELL AS RECORD HIGHS FOR TUESDAY
AND WEDNESDAY, IF THEY ARE AVAILABLE:
TUES (RECORD/YR) WEDS (RECORD/YR)
PORTLAND 92 (103/1941) 98 (104/1979)
VANCOUVER 92 (103/1941) 98 (101/1941)
SALEM 93 (108/1941) 99 (103/1979)
EUGENE 92 (102/1941) 97 (102/1979)
KELSO/LONGVIEW 90 95
BATTLE GROUND 91 96
ASTORIA 74 (86/1979) 74 (87/1979)
NEWPORT 70 72
THE CURRENT FORECAST DOES NOT HAVE RECORD BREAKING HEAT FOR OUR
AREA. HOWEVER, SOME AREAS DO HAVE A SMALL PROBABILITY OF SEEING
TRIPLE DIGIT HEAT ON TUESDAY AND WEDNESDAY. FOR TUESDAY, THE
WILLAMETTE VALLEY HAS A 5%-25% PROBABILITY OF REACHING DAYTIME
HIGHS OF 100 DEGREES FAHRENHEIT, WITH LOCATIONS IN THE CENTRAL
AND SOUTHERN WILLAMETTE VALLEY HAVING THE HIGHER PROBABILITIES.
FOR WEDNESDAY, THE WILLAMETTE VALLEY HAS A 50%-70% PROBABILITY
OF REACHING DAYTIME HIGHS OF 100 DEGREES FAHRENHEIT, WITH
LOCATIONS IN THE CENTRAL AND SOUTHERN WILLAMETTE VALLEY HAVING
THE HIGHER PROBABILITIES. OVERALL, WHILE MONDAY WILL BE
RELATIVELY COOL FOR THE FORECAST AREA, TUESDAY AND WEDNESDAY
WILL BE HOT AND DRY. WEDNESDAY IS ON TRACK TO BE THE HOTTEST DAY
THIS WEEK, WITH MOST INLAND AREAS HAVING THE POTENTIAL TO SEE
DAYTIME HIGHS IN THE TRIPLE DIGITS.
GIVEN THE HOT DAYS TO COME, HEATRISK REMAINS MODERATE, WITH
SOME LOCATIONS FALLING INTO THE MAJOR HEATRISK CATEGORY. TAKE
THE NECESSARY HEAT PRECAUTIONS AS HOT TEMPERATURES MAY LEAD TO
HEAT ILLNESSES. /42
LONG TERM...THURSDAY THROUGH SATURDAY
AS WE MOVE INTO THE
LATTER PART OF THIS WEEK AND INTO THE WEEKEND, MODELS ARE
SHOWING A SLIGHT COOLING TREND FOR THE REGION. WHILE THURSDAY
DAYTIME HIGHS ARE EXPECTED TO BE IN THE LOW 90S FOR THE
WILLAMETTE VALLEY (THIS COULD RESULT IN AN EXTENSION OF THE
TUESDAY AND WEDNESDAY HEAT HEADLINES), THERE IS SOME COOLER
WEATHER ON THE HORIZON. THE BROAD, UPPER LEVEL HIGH LOOKS TO
BREAK DOWN THANKS IN PART TO A SERIES OF UPPER LEVEL LOWS
SWINGING DOWN OUT FAR WESTERN CANADA. WPC 500 MB CLUSTERS ARE AT
LEAST LEANING TOWARDS A SERIES OF WEAK LOWS FOR THE LATTER PART
OF THE WEEK. WILL CONTINUE TO MONITOR, BUT THE OVERALL TREND
FOR THE LONG TERM FORECAST DOES MAINTAIN DRY CONDITIONS, BUT
DAYTIME HIGHS LOOKS TO COOL TOWARDS THE MID TO UPPER 80S FOR THE
WILLAMETTE VALLEY, UPPER 70S TO MID 80S FOR THE CASCADES AND
LOW TO UPPER 60S ALONG THE COAST. /42
AVIATION
TONIGHT, HIGH PRESSURE WILL MAINTAIN VFR CONDITIONS
WITH CLEAR SKIES INLAND AND LIFR/IFR MARINE STRATUS ALONG THE COAST.
BETWEEN 14-17Z MON, GUIDANCE SUGGESTS A 15-30% CHANCE FOR MVFR
STRATUS DEVELOPING AROUND THE PORTLAND/VANCOUVER METRO AREA. ANY
MORNING STRATUS INLAND SHOULD SCATTER OUT BY 17-19Z MON AS DAYTIME
HEATING PROGRESSES. VFR CONDITIONS WITH MOSTLY SUNNY SKIES PREVAIL
INLAND THROUGH THE REST OF THE TAF PERIOD.
A SHORTWAVE TROUGH WILL ALSO MOVE OVER THE REGION MONDAY MORNING,
ALLOWING MARINE STRATUS ALONG THE COAST TO LIFT TO MORE IFR/MVFR
THRESHOLDS BY 18-21Z MON. NO PRECIPITATION IS EXPECTED WITH THIS
SHORTWAVE. EXPECT BREEZY NORTHERLY TO NORTHWESTERLY WINDS ACROSS THE
AREA WITH GUSTS UP TO 25-30 KT ALONG THE COAST AND 20-25 KT INLAND,
STRONGEST IN THE AFTERNOON.
PDX AND APPROACHES...PREDOMINATELY VFR THROUGH THE TAF PERIOD WITH
MOSTLY CLEAR SKIES. GUIDANCE SUGGESTS A 15-30% CHANCE FOR MVFR CIGS
BETWEEN 14-17Z MON. STRATUS WILL BE DIFFICULT TO FORM GIVEN THE
OVERALL DRIER AIR MASS, SO IF IT DOES FORM IT WOULD BE SHORT-LIVED.
LIGHT NORTHWESTERLY WINDS OVERNIGHT UNDER 10 KT, STRENGTHENING
MONDAY AFTERNOON WITH GUSTS UP TO 20 KT. -ALVIZ
MARINE
BROAD AREA OF HIGH PRESSURE OVER THE PACIFIC WILL KEEP
CONDITIONS FAIRLY PERSISTENT OVER THE NEXT FEW DAYS. UPWELLING ALONG
THE COASTLINE IS PRODUCING LOW CLOUD COVER AND FOG IN THE INNER
WATERS AND THE COLUMBIA RIVER BAR. GIVEN THE TREND OVER THE LAST FEW
DAYS, HAVE ISSUED A DENSE FOG ADVISORY THROUGH MONDAY MORNING.
ON MONDAY, A WEAK DISTURBANCE WILL MOVE OVER THE REGION. WILL SEE
COOLER TEMPERATURES, NORTHWESTERLY FLOW, AND BUILDING SEAS. WINDS
REMAIN ELEVATED THROUGH EARLY MONDAY MORNING BEFORE EASING, AND A
FRESH SWELL MOVES IN. THE SMALL CRAFT ADVISORY CURRENTLY ISSUED FOR
WINDS WILL LIKELY TRANSITION TO A WAVE BASED ADVISORY LATE MONDAY.
HOWEVER, CONDITIONS ARE BORDERLINE SO IF THERE IS ANY LIMITATION OF
THE WIND WAVES, OVERALL SIGNIFICANT WAVE HEIGHTS WILL BE LESS.
HIGH PRESSURE REBUILDS THROUGH THE WEEK WITH A TYPICAL SUMMER
PATTERN OF NORTHERLY WINDS AS A THERMAL TROUGH FORMS ALONG THE
COAST.-MUESSLE
PQR WATCHES/WARNINGS/ADVISORIES
OR...HEAT ADVISORY UNTIL 10 PM PDT THIS EVENING FOR ORZ108-109-111-
112-114>118-120>122.
HEAT ADVISORY FROM NOON TUESDAY TO 10 PM PDT WEDNESDAY FOR
ORZ108>122.
WA...HEAT ADVISORY UNTIL 10 PM PDT THIS EVENING FOR WAZ204>207-209-
210.
HEAT ADVISORY FROM NOON TUESDAY TO 10 PM PDT WEDNESDAY FOR
WAZ204>207-209-210.
PZ...DENSE FOG ADVISORY UNTIL 2 PM PDT MONDAY FOR PZZ210-251>253.
SMALL CRAFT ADVISORY UNTIL 11 PM PDT MONDAY FOR PZZ251>253-
271>273.
WWW.WEATHER.GOV/PORTLAND
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X.COM/NWSPORTLAND
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