026
FXUS66 KPQR 061109
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
409 AM PDT THU AUG 6 2026
SYNOPSIS
THE REGION REMAINS UNDERNEATH A PATTERN FAVORING
HOT AND DRY CONDITIONS BUT IMPROVEMENT IS ALREADY SLOWLY
UNDERWAY IN REGARDS TO LINGERING SMOKE/HAZE ACROSS THE REGION -
A TREND WHICH ACCELERATES LATER TODAY INTO TONIGHT. HIGH
TEMPERATURES FOR MOST INLAND VALLEY LOCATIONS PEAK IN THE UPPER
80S TO MID-90S THROUGH FRIDAY LEADING TO MODERATE HEATRISK
IMPACTS. TEMPERATURES MODERATE OVER THE WEEKEND WITH RENEWED
ONSHORE FLOW KEEPING SMOKE PINNED EAST OF THE CASCADE CRESTS.
NEAR NORMAL SUMMERTIME WEATHER CONDITIONS ARE ANTICIPATED MONDAY
THROUGH THE MIDDLE NEXT WEEK.
DISCUSSION...TONIGHT THROUGH WEDNESDAY
WEAK ONSHORE FLOW HAS
BEGUN TO TAKE HOLD EARLY THIS MORNING AS THE RIDGE OF HIGH
PRESSURE, WHICH UP UNTIL LATE YESTERDAY(WED) HAD SUPPORTED
EASTERLY FLOW NEAR THE SURFACE, IS FINALLY BEGINNING TO
PROGRESS. WE'VE ALREADY SEEN SMOKE/HAZE IMPROVEMENT ALONG THE
COAST, THROUGH THE COASTAL GAPS, AND ALONG THE WESTERN COLUMBIA
RIVER INTO THE NORTHERN PORTLAND/VANCOUVER METRO. STILL, AS WE
GO THROUGH TODAY IT'LL TAKE SOME TIME TO COMPLETELY FLUSH THE
WILDFIRE SMOKE FROM THE REGION WITH A MORE NOTICEABLE
IMPROVEMENT FOR MANY OF THE INLAND VALLEYS ARRIVING THIS
EVENING. WHILE THE THICK SMOKE AND HAZE TEMPERED HIGH
TEMPERATURES FROM TRULY REALIZING THEIR POTENTIAL YESTERDAY,
ENSEMBLE 850 MB TEMPS OF AROUND 20-22C ARE EXPECTED TO PRESENT
AGAIN TODAY, AND WITH THE SMOKE GRADUALLY DISPERSING, MORE
SUNSHINE COULD LEAD TO SLIGHTLY WARMER TEMPERATURES INLAND WITH
HIGHS IN THE LOW TO MID 90S.
GIVEN THE EXPECTED TEMPERATURES THIS AFTERNOON, A HEAT ADVISORY
REMAINS IN EFFECT ACROSS THE INLAND VALLEYS THROUGH THIS
EVENING HIGHLIGHTING THE INCREASED RISK OF HEAT-RELATED
ILLNESSES. IN AREAS WITH AIR QUALITY ADVISORIES IN EFFECT, IT IS
RECOMMENDED TO KEEP WINDOWS AND DOOR SHUT TO PREVENT SMOKE FROM
GOING INDOORS. SOMETHING AS SIMPLE AS A LARGE BOX FAN WITH A
DAMP TOWEL DRAPED OVER THE FRONT OF IT CAN PROVIDE EFFECTIVE
COOLING GIVEN THE DRY AIRMASS IN PLACE TODAY IF YOU'RE SEEKING
SOME ALTERNATIVE MEANS OF RELIEF.
FRIDAY AND INTO THE WEEKEND, THE AXIS OF THE BROAD UPPER-LEVEL RIDGE
FEATURE PROGRESSES FURTHER EAST OF OR/WA, WHILE MORE ZONAL FLOW
DEVELOPS OVER WESTERN OREGON AND SOUTHWESTERN WASHINGTON.
HOWEVER, AT LEAST ON FRIDAY AND SATURDAY CONFIDENCE IS HIGH
THERE'LL BE ENOUGH INFLUENCE FROM THE HIGH PRESSURE RIDGE ALOFT
AND A SLIGHT INCREASE IN UPPER-LEVEL HEIGHTS TO KEEP HIGH
TEMPERATURES IN THE UPPER 80S TO LOW 90S - WARMEST THE FORMER
DAY. FORTUNATELY, ANY LINGERING WILDFIRE SMOKE SHOULD BE
COMPLETELY FLUSHED FROM WEST OF THE CASCADE CRESTS ASSUMING NO
ADDITIONAL NEW STARTS LOCALLY. ONSHORE NORTHWESTERLY FLOW IS
EXPECTED TO STRENGTHEN FURTHER THE SECOND HALF OF THE WEEKEND
INTO EARLY NEXT WEEK HELPING TEMPERATURES MODERATE BACK CLOSE TO
NORMAL WITH HIGH CONFIDENCE IN MAXIMUM TEMPERATURES RETURNING
TO THE LOW TO MID 80S RANGE SUNDAY/MONDAY THROUGH THE MIDDLE OF
THE WEEK. AREAS WITH GOOD COASTAL MARINE INFLUENCE CAN EXPECT
A DAILY DANCE BETWEEN MORNING LOW CLOUDS AND AFTERNOON
SUNSHINE. IF YOU'RE SEARCHING FOR ANY RAINFALL CHANCES HEADED
THROUGH THE MIDDLE TO END OF NEXT WEEK YOU'RE LIKELY OUT OF LUCK
AS THERE ARE NO SIGNS OF ANY APPRECIABLE PRECIPITATION FOR
WESTERN OREGON AND SOUTHWESTERN WASHINGTON HEADED INTO THE
MIDDLE OF AUGUST. -99/DH
AVIATION...THROUGH 12Z FRI
CURRENT SATELLITE IMAGERY AND
SURFACE OBSERVATIONS DEPICT AREAS OF LOW STRATUS AND IFR/LIFR
CONDITIONS ALONG THE COAST, WITH A MIX OF MVFR TO VFR VIS
INLAND DUE TO LINGERING SMOKE/HAZE. FOR INLAND TERMINALS,
INCREASING NW FLOW AS THE DAY PROGRESSES WILL KEEP WORKING TO
SLOWLY FLUSH SMOKE OUT THE REGION LEADING TO THE RETURN OF
PREVAILING VFR CONDITIONS, ALTHOUGH FOR TRULY SIGNIFICANT
IMPROVEMENT IT'LL LIKELY TAKE UNTIL THE 00-06Z FRIDAY. UNTIL
THIS POINT MOST SITES MAINTAIN A 30-40% CHANCE FOR MVFR VIS.
ALONG THE COAST, LIFR/IFR STRATUS IS EXPECTED TO PERSIST UNTIL
17-20Z BEFORE A WINDOW OF POTENTIAL IMPROVEMENT TO MVFR/VFR
DURING THE AFTERNOON HOURS, MOST LIKELY NEAR KAST, BEFORE
STRATUS REBUILDS 02-05Z FOR THE EVENING. WINDS STAY FAIRLY
LIGHT, ONLY GUSTING UP TO 5-12 KNOTS THIS AFTERNOON BEFORE
DECREASING OVERNIGHT.
KPDX AND APPROACHES...VIS CONTINUES TO FLUCTUATE BETWEEN 5-6SM
EARLY THIS MORNING WITH ONLY LIMITED IMPROVEMENT UNTIL 00Z,
AFTER WHICH POINT VFR CONDITIONS WILL BE HEAVILY FAVORED. UP
UNTIL THEN, EXPECT OCCASIONAL MVFR CONDITIONS. EXPECT
NORTHWESTERLY WINDS AROUND 3-10 KT, STRONGEST IN THE AFTERNOON.
-99/10
MARINE
HIGH PRESSURE AT THE SURFACE OVER THE EASTERN PACIFIC
KEEPS NORTHERLY WINDS IN PLACE THE REMAINDER OF THE WEEK THROUGH
THE WEEKEND AND INTO NEXT WEEK AS WELL. CONFIDENCE IS MODERATE TO
HIGH BOTH SEAS AND WINDS REMAIN BELOW SMALL CRAFT CRITERIA
THROUGH TODAY AND FRIDAY. HOWEVER, WINDS INCREASE LATER ON
SATURDAY WITH THE NBM PROJECTING A 40-70% CHANCE FOR GUSTS ABOVE
21 KNOTS INTO THE EVENING HOURS. SIMILAR PROBABILITIES ARE PRESENT
DURING THE AFTERNOON/EVENING HOURS INTO EARLY NEXT WEEK SO SMALL
CRAFT ADVISORIES MAY BE NEEDED YET AGAIN, MAINLY ACROSS THE OUTER
WATERS. SEAS HOLD AROUND 4-7 FEET AT 7-8 SECONDS OVER THE NEXT 5-7
DAYS. -99
PQR WATCHES/WARNINGS/ADVISORIES
OR...HEAT ADVISORY UNTIL 11 PM PDT THIS EVENING FOR ORZ108>118.
WA...HEAT ADVISORY UNTIL 11 PM PDT THIS EVENING FOR WAZ204>208.
PZ...NONE.
WWW.WEATHER.GOV/PORTLAND
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSPORTLAND
X.COM/NWSPORTLAND
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