782
FXUS66 KPQR 100558 AAA
AFDPQR
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PORTLAND OR
1058 PM PDT THU JUL 9 2026
UPDATED AVIATION DISCUSSION...
SYNOPSIS
PERSISTENT ONSHORE FLOW WILL CONTINUE TO YIELD DRY
AND SEASONABLE WEATHER THROUGH THIS WEEKEND. TEMPERATURES TREND
WARMER EARLY NEXT WEEK AS HIGH PRESSURE BUILDS OVER THE PLAINS.
BEYOND MIDWEEK, FORECAST UNCERTAINTY INCREASES BUT DRY AND
HOTTER WEATHER IS FAVORED.
DISCUSSION...NOW THROUGH WEDNESDAY
PLEASANT, SEASONABLE, AND
BENIGN WEATHER IS EXPECTED TO CONTINUE THROUGH THIS WEEKEND AS
ZONAL FLOW ALOFT TURNS SOUTHWESTERLY AHEAD OF AN UPPER-LEVEL
TROUGH MOVING ONSHORE INTO BRITISH COLUMBIA ON SATURDAY.
TEMPERATURES WILL REMAIN NEAR SEASONAL NORMS, REACHING AFTERNOON
HIGHS IN THE UPPER 70S TO LOW 80S IN INTERIOR VALLEYS AND LOW TO
MID 60S ALONG THE COAST EACH AFTERNOON. INLAND INTRUSIONS OF LOW
MARINE STRATUS CLOUDS OVERNIGHT WILL LARGELY CLEAR TO SUNNY
SKIES EACH DAY, ASIDE FROM MORE PERSISTENT COASTAL CLOUDS
FRIDAY AND A DEEPER INLAND INTRUSION SATURDAY MORNING AS THE
TROUGH MAKES ITS CLOSEST APPROACH. THESE CLOUDS WILL HELP KEEP
FRIDAY AND SATURDAY A FEW DEGREES COOLER.
BY THE BEGINNING OF NEXT WEEK, A BROAD UPPER-LEVEL RIDGE OVER
THE CENTRAL PLAINS WILL AMPLIFY, PUSHING HEIGHTS ALOFT UPWARD
LOCALLY. THIS WILL RESULT IN WARMER TEMPERATURES MONDAY AND
TUESDAY, WITH AFTERNOON HIGHS MOST LIKELY IN THE MID 80S TO
AROUND 90 DEGREES WITHIN INLAND VALLEYS AND MID 60S TO NEAR 70
DEGREES ON THE COAST. TEMPERATURES LOOK TO PEAK ON TUESDAY, WITH
THE CHANCES TO EXCEED 90 DEGREES REACHING 25-40% ALONG THE I-5
CORRIDOR FROM PORTLAND SOUTHWARD. THE CHANCES FOR MODERATE
HEATRISK REACH 25-45%, HIGHEST IN THE LOWER TUALATIN VALLEY
(BEAVERTON, TIGARD, TUALATIN) AND ADJACENT PORTIONS OF MULTNOMAH
AND CLACKAMAS COUNTIES (PORTLAND, WILSONVILLE, CANBY), WHILE THE
CHANCES OF MAJOR HEATRISK REMAIN LESS THAN 5%. WHILE FORECAST
UNCERTAINTY INCREASES, THE ENSEMBLE CONSENSUS IS THAT ANOTHER
TROUGH WILL MOVE INTO WESTERN CANADA MIDWEEK, PUSHING
TEMPERATURES BACK DOWN A FEW DEGREES ON WEDNESDAY, RESULTING IN
WIDESPREAD MINOR HEATRISK.
LOOKING SLIGHTLY BEYOND THE 7-DAY FORECAST PERIOD, THE ENSEMBLE
CONSENSUS SUGGESTS THE ROBUST INLAND RIDGE MAY RETROGRADE TO
THE WEST, RESULTING IN INCREASED CHANCES FOR MORE HAZARDOUS
HEAT TOWARD THE END OF NEXT WEEK. AT THIS LEAD TIME, THE CHANCES
FOR MAJOR HEATRISK REACH 10-25% FROM SALEM NORTH TO THE LOWER
COWLITZ VALLEY AND PORTLAND EAST THROUGH THE COLUMBIA GORGE FROM
NEXT THURSDAY INTO THE FOLLOWING WEEKEND. -36
AVIATION
A WEAK UPPER LEVEL TROUGH DIGS SOUTH TOWARDS AIRSPACE,
TURNING THE FLOW ALOFT MORE SOUTHWESTERLY. EXPECT VFR CONDITIONS
TO CONTINUE THROUGH THE TAF PERIOD FOR INLAND TERMINALS, WITH ONLY
A 10-20% CHANCE FOR MVFR CIGS BETWEEN 12-17Z FRI. FOR COASTAL
TERMINALS, EXPECT DETERIORATED CONDITIONS TO BEGIN AROUND 07-09Z
FRI AND CONTINUE THROUGH THE REST OF THE TAF PERIOD. SPECIFICALLY,
BETWEEN 07-17Z FRI, EXPECT A MIX OF LIFR/IFR CONDITIONS (20-40%
CHANCE OF LIFR, 30-50% CHANCE OF IFR), THEN GRADUAL IMPROVING MVFR
CONDITIONS THEREAFTER (CHANCES OF MVFR DECREASING FROM 70% TO
30%). OTHERWISE, EXPECT WEST TO NORTHWESTERLY WINDS 5-10 KT AT ALL
TERMINALS, HIGHEST DURING THE AFTERNOON. POSSIBLE GUSTS UP TO 20
KT AT A FEW INLAND TERMINALS.
KPDX AND APPROACHES...VFR CONDITIONS WITH A 10-20% CHANCE OF MVFR
CIGS BETWEEN 12-17Z FRI. NORTHWESTERLY WINDS AROUND 5-10 KT, WITH
GUSTS UP TO 20 KT POSSIBLE DURING THE AFTERNOON.
~12
MARINE
HIGH PRESSURE OVER THE WATERS TODAY WILL MAINTAIN
BREEZY NORTH TO NORTHWEST WINDS THROUGH THIS EVENING. GUSTS UP
TO 20 KT WILL BE POSSIBLE SOUTH OF CAPE FOULWEATHER. A WEAK
COLD FRONT WILL MOVE ACROSS THE WATERS ON FRIDAY, ULTIMATELY
DISRUPTING THE HIGH PRESSURE AND DECREASING WINDS ACROSS THE
WATERS. HIGH PRESSURE EFFETELY REBUILDS OVER THE COASTAL WATERS
THROUGH THE WEEKEND, RETURNING NORTHERLY WINDS LATER SATURDAY
AND INCREASING PRESSURE GRADIENTS ON SUNDAY, RETURNING CHANCES
FOR GUSTS UP TO 25 KT. SEAS ARE EXPECTED TO REMAIN AROUND 4 TO 6
FT AS RELATIVELY BENIGN CONDITIONS PERSIST THROUGH THE WEEKEND
AND INTO THE START OF NEXT WEEK. /DH
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...NONE.
WWW.WEATHER.GOV/PORTLAND
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