103
FXUS66 KPQR 070453
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
953 PM PDT FRI JUN 6 2025
UPDATED AVIATION DISCUSSION
SYNOPSIS
RIDGING WILL GRADUALLY SHIFT EASTWARD INTO EARLY
NEXT WEEK, SUPPORTING HOT AND DRY CONDITIONS. THE HOTTEST DAYS
OF THE YEAR SO FAR ARE EXPECTED AS INLAND VALLEY AREAS ARE
LIKELY TO SURPASS 90 DEGREES BOTH SUNDAY AND MONDAY, WHILE THE
COAST STAYS COOLER. PROLONGED EXPOSURE TO THE HOT TEMPS COULD
RESULT IN HEAT RELATED ILLNESSES. A BREAKDOWN OF THE RIDGE AND
MAY SEE A RETURN TO MORE SEASONABLE TEMPERATURES LATER NEXT
WEEK.
SHORT TERM...NOW THROUGH MONDAY NIGHT
A RIDGE OF HIGH
PRESSURE OVER THE NORTHEAST PACIFIC WILL GRADUALLY SHIFT
EASTWARD THIS WEEKEND AND INTO EARLY NEXT WEEK. LOW TO MID 80S
ARE EXPECTED THIS AFTERNOON THROUGHOUT THE WILLAMETTE VALLEY AND
COLUMBIA RIVER GORGE. TEMPS WILL CONTINUE TO RISE SATURDAY AND
SUNDAY, WITH THE WARMEST TEMPS OF THE YEAR SO FAR EXPECTED
ACROSS SOUTHWEST WA AND NORTHWEST WA. THE CENTER OF THE RIDGE
WILL CONTINUE EASTWARD WITH THE CENTER ALMOST DIRECTLY OVERHEAD
ON SUNDAY. THERMAL LOW PRESSURE IS EXPECTED TO DEVELOP WEST OF
THE CASCADES BOTH DAYS AS WELL, HELPING SUPPORT AT MINIMUM, WEAK
EASTERLY DOWNSLOPE FLOW. SATURDAY HIGHS ARE EXPECTED TO REACH
INTO THE UPPER 80S, POSSIBLY LOW 90S WHILE THE COAST REMAINS IN
THE UPPER 60S TO LOW 70S. SUNDAY WILL BE EVEN WARMER WITH INLAND
TEMPS LIKELY SURPASSING 90, POSSIBLY 95 DEGREES. PROBS TO REACH
90 DEGREES ARE 80 TO NEARLY 100% AND 40- 70% TO REACH 95 AROUND
THE METRO, SLIGHTLY LOWER AROUND 20% FOR THE REST OF THE
WILLAMETTE VALLEY.
THIS WARM-UP WILL SUPPORT A MODERATE HEATRISK ACROSS MORE
DENSELY POPULATED AREAS THROUGHOUT THE INLAND VALLEYS ON
SATURDAY, NAMELY ALONG THE WILLAMETTE AND LOWER COLUMBIA VALLEYS
FROM SALEM NORTH THROUGH KELSO/LONGVIEW INCLUDING PORTLAND AS
WELL AS THE LOWER HOOD RIVER VALLEY. MODERATE HEATRISK EXPANDS
ON SUNDAY TO MUCH OF THE CASCADE FOOTHILLS AND PORTIONS OF THE
COAST RANGE WHILE PORTIONS OF THE WESTERN COLUMBIA RIVER GORGE
AND EASTERN METRO COULD BUMP UP TO MAJOR HEATRISK. THE MODERATE
HEATRISK PULLS BACK A BIT ON MONDAY BUT HOT TEMPS, SIMILAR TO
SUNDAY, ARE EXPECTED FOR MUCH OF THE WILLAMETTE VALLEY AND
COLUMBIA RIVER GORGE. THE HOTTER THAN AVERAGE TEMPERATURES
THROUGHOUT THE WILLAMETTE VALLEY AND COLUMBIA RIVER GORGE HAVE
PROMPTED THE ISSUANCE OF A HEAT ADVISORY THAT WILL BE IN AFFECT
FROM 10 AM SUNDAY THROUGH 10 PM MONDAY. TIPS ON HOW TO REMAIN
SAFE DURING THIS WARM-UP CAN BE FOUND IN OUR HEAT ADVISORY
PRODUCT.
OVERNIGHT LOWS WILL STAY IN THE 50S FOR MOST LOCATIONS, BUT
SATURDAY AND SUNDAY NIGHTS COULD REMAIN IN THE LOW 60S,
PARTICULARLY IN URBAN AREAS. THIS WILL HELP GIVE SOME REPRIEVE
FROM THE HOT CONDITIONS DURING THE DAY. WHILE NOT EXTREME, THE
PROLONGED HEAT MAY STILL POSE HEALTH RISKS TO SENSITIVE
POPULATIONS. COASTAL AREAS WILL REMAIN COOLER WITH HIGHS MOSTLY
IN THE LOW TO MID 70S, THOUGH SOME LOCATIONS COULD BRIEFLY REACH
THE UPPER 70S DEPENDING ON WIND DIRECTION. BREEZY AFTERNOON
WINDS ARE EXPECTED DAILY, OCCASIONALLY GUSTING TO 15-20 MPH IN
THE VALLEYS. THESE WINDS COULD PROVIDE MODEST, LOCALIZED RELIEF
FROM THE HEAT BUT WILL NOT SIGNIFICANTLY AFFECT OVERALL WARMING.
-BATZ
LONG TERM...TUESDAY THROUGH FRIDAY
BY TUESDAY INTO THE
MIDDLE OF NEXT WEEK, THE RIDGE WILL BREAK DOWN AS LARGE-SCALE
TROUGHING BECOMES FAVORED OVER THE WEST COAST. WHILE THE DETAILS
REMAIN LOW-CONFIDENCE, A RETURN TO MORE SEASONABLE TEMPERATURES
IN THE 60S AND 70S IS FAVORED BY THE LATTER HALF OF THE WEEK.
EMBEDDED SHORTWAVES PASSING OVER THE PACIFIC NORTHWEST MAY BRING
SOME LOW CHANCES FOR PRECIPITATION, BUT AT THIS LEAD TIME, ONLY
A FEW GLOBAL ENSEMBLE MEMBERS ARE SUGGESTING ANY ACCUMULATING
RAINFALL. -PICARD
AVIATION
YET ANOTHER EVENING WITH MARINE STRATUS IN PLACE ALONG
THE COAST AND A MIX OF IFR TO LIFR CONDITIONS AT KAST AND KONP.
LITTLE CHANGE IS EXPECTED AT THESE SITES THROUGH THE REST OF THE
OVERNIGHT HOURS INTO SATURDAY MORNING. OTHERWISE, LITTLE TO
IMPACTS ARE ANTICIPATED ACROSS INLAND SITES WITH PREVAILING VFR
CONDITIONS. WILL ONCE AGAIN NEED TO WATCH FOR PATCHY LOW CLOUD
COVER DEVELOPMENT AROUND SUNRISE ALONG THE WEST SLOPES OF THE
CASCADES BUT MODEL GUIDANCE INDICATES ONLY A 20-35% CHANCE FOR
CIGS AT KTTD TO DROP TO MVFR AROUND 12-15Z. WINDS GENERALLY REMAIN
BELOW 10-15 KNOTS INLAND WITH GUSTS UP TO 20 KNOTS POSSIBLE ALONG
THE COAST SATURDAY AFTERNOON.
PDX AND APPROACHES...VFR WITH NO CONCERNS THROUGH THE FORECAST
PERIOD. NW WINDS GENERALLY REMAIN BELOW 10 KNOTS THROUGH THE
FORECAST PERIOD. -SCHULDT
MARINE
HIGH PRESSURE WITH A THERMAL THROUGH SETTING UP ALONG
THE COAST. NORTHERLY WINDS INTENSIFY, ESPECIALLY ALONG THE
INNER COASTAL WATERS WITH GUSTS EXCEEDING 25 KT. WILL SEE THESE
CONDITIONS PERSIST A BIT LONGER THAN PREVIOUSLY FORECAST SO HAVE
EXTENDED THE SMALL CRAFT ADVISORY UNTIL EARLY SATURDAY MORNING.
A COMBINATION OF WINDS AND SEAS ARE SPARKING THAT ADVISORY AS
SEAS ARE AROUND 6-8 FT AT 10 SECONDS. THROUGH THE WEEKEND, THE
THERMAL TROUGH WILL INTENSIFY, BUT THE PRESSURE COMPONENT WILL
NOT NECESSARILY BE THERE. WITH THE INCOMING BUILDING OF THE
RIDGE, EXPECT TYPICAL SUMMER TIME NORTHERLY WINDS. COULD SEE
SOME BREEZIER WINDS THROUGH THE BAYS AND SOME EXPOSED MOORAGES,
BUT OVERALL, GUSTS SHOULD REMAIN BELOW 20 KT.
ONSHORE FLOW RETURNS TUESDAY INTO WEDNESDAY AS THE RIDGE BREAKS
DOWN. WINDS WILL BECOME GUSTY ONCE AGAIN, BUT NOT EXPECTING WINDS
ABOVE SMALL CRAFT ADVISORY CRITERIA. -MUESSLE
CLIMATE
DAILY RECORD HIGH TEMPERATURES (FOR REFERENCE):
SUNDAY, JUNE 8
PORTLAND94 (1955)
SALEM98 (1955)
EUGENE93 (2015)
ASTORIA97 (1903)
MONDAY, JUNE 9
PORTLAND95 (1955)
SALEM96 (1955)
EUGENE91 (2015)
ASTORIA87 (1924)
PQR WATCHES/WARNINGS/ADVISORIES
OR...HEAT ADVISORY FROM 10 AM SUNDAY TO 10 PM PDT MONDAY FOR
ORZ108>123.
WA...HEAT ADVISORY FROM 10 AM SUNDAY TO 10 PM PDT MONDAY FOR
WAZ204>207-209-210.
PZ...SMALL CRAFT ADVISORY UNTIL 5 AM PDT SATURDAY FOR PZZ252-253-
271>273.
WWW.WEATHER.GOV/PORTLAND
INTERACT WITH US VIA SOCIAL MEDIA:
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X.COM/NWSPORTLAND
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