123
FXUS66 KPQR 101120
AFDPQR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
420 AM PDT FRI JUL 10 2026
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 THURSDAY
SEASONABLE CONDITIONS ARE
EXPECTED ACROSS THE REGION THROUGH THE WEEKEND. AN UPPER LEVEL
TROUGH OVER NORTHERN BRITISH COLUMBIA WILL SLIP FARTHER SOUTH
TODAY, SUPPORTING AVERAGE TEMPERATURES IN THE UPPERS 70S TO LOW
80S ACROSS THE INLAND VALLEYS AND IN THE LOW TO MID 60S ALONG
THE COAST EACH AFTERNOON. MARINE STRATUS EXPECTED TO REMAIN
CONFINED TO THE COAST, COAST RANGE VALLEYS, AND ALONG THE LOWER
COLUMBIA RIVER FRIDAY. COASTAL LOCATIONS MAY SEE A SHORT PERIOD
OF BROKEN OR SCATTERED CLOUDS THIS AFTERNOON BEFORE STRATUS
REBUILDS EASTWARD. STRATUS IS EXPECTED TO BE MORE WIDESPREAD
TONIGHT INTO SATURDAY MORNING AS THE TROUGH SHIFTS MORE
OVERHEAD. SATURDAY MORNING IS EXPECTED TO START OUT CLOUDY,
EVENTUALLY DISSIPATING BY THE AFTERNOON BUT OVERALL KEEPING THE
TEMPERATURES COOLER.
EXPECT A SHIFT TOWARD WARMER TEMPERATURES TO START NEXT WEEK AS
AN UPPER LEVEL RIDGE AMPLIFIES OVER THE CENTRAL PLAINS.
TEMPERATURES EXPECTED TO JUMP INTO THE MID 80S TO AROUND 90
DEGREES ON MONDAY AND TUESDAY FOR INLAND VALLEYS AND MID 60S TO
AROUND 70 DEGREES ALONG THE COAST. TUESDAY LOOKS LIKE THE
WARMEST DAY NEXT WEEK AND HAS THE HIGHEST AND MOST WIDESPREAD
PROBABILITIES FOR 90 DEGREES. CHANCES ARE 30-40% ALONG THE I-5
CORRIDOR AND AROUND THE PORTLAND METRO WITH LOWER CHANCES OF
15-30% WITHIN THE CASCADE AND COAST RANGE FOOTHILLS. THERE IS
ALSO A LOW (5-15%) CHANCE FOR SOME LOCATIONS AROUND THE CENTRAL
WILLAMETTE VALLEY TO REACH 95 OR GREATER. THE CHANCES FOR MODERATE
HEATRISK REACH 25-50%, 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%.
CONFIDENCE BEGINS TO DROP OFF BY THE MIDDLE OF NEXT WEEK WITH
500 MB CLUSTERS DIVIDED ON WHETHER THE RIDGE REMAINS THE
DOMINANT FEATURE OR IF A TROUGH IS ABLE TO MOVE INTO THE REGION.
THERE IS A 15-20 DEGREE SPREAD IN THE 10TH-90TH PERCENTILE HIGH
TEMPERATURES FOR WEDNESDAY, RANGING FROM THE MID 70S TO MID
90S. AT THIS LEAD TIME AND GIVEN THE UNCERTAINTY, 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 WEDNESDAY THROUGH FRIDAY. -19/36
AVIATION
A TROUGH CONTINUES TO DIG SOUTHWARD TOWARD THE
REGION, SUPPORTING ONSHORE FLOW AND MARINE STRATUS ALONG THE
COAST. MVFR/IFR CIGS ARE EXPECTED TO PERSIST ALONG THE COAST
INTO THE AFTERNOON WITH A CHANCE FOR CLOUD COVER TO BREAK UP OR
CLEAR OUT LATE THIS AFTERNOON. HIGHER CHANCES FOR VFR CONDITIONS
AROUND KONP AT 70-80% AFTER 20Z AND LOWER CHANCES AROUND KAST
AT 40-50%. THERE IS ALSO A 40-50% CHANCE FOR MVFR CIGS IN THE
EASTERN PORTLAND METRO BETWEEN 12-18Z. STRATUS QUICKLY REBUILDS
ALONG THE COAST THIS EVENING ALONG WITH BACKBUILDING TOWARD THE
LOWLANDS OFF THE CASCADE FOOTHILLS AFTER 06-09Z SATURDAY.
EXPECT MVFR OR LOWER CIGS FOR ALL TERMINALS FOR A PERIOD
SATURDAY MORNING.
LIGHT WEST TO NORTHWEST WINDS LESS THAN 5 KT THROUGH 18Z, THEN
INCREASING TO 6-10 KT FOR ALL TERMINALS. COULD SEE A FEW GUSTS
TO AROUND 15-18 KT AROUND THE PORTLAND METRO AFTER 00Z.
KPDX AND APPROACHES...VFR CONDITIONS WITH A 30-50% CHANCE OF
MVFR CIGS BETWEEN 12-18Z. NORTHWESTERLY WINDS AROUND 5 KT,
INCREASING TO 7-9 KT AFTER 18Z AND POSSIBLE GUSTS 15-18 KT AFTER
00Z SATURDAY. -19
MARINE
A WEAK COLD FRONT WILL MOVE ACROSS THE WATERS ON
TODAY, ULTIMATELY DISRUPTING THE HIGH PRESSURE AND DECREASING
WINDS ACROSS THE WATERS. HIGH PRESSURE REBUILDS OVER THE
COASTAL WATERS THROUGH THE WEEKEND, RETURNING NORTHERLY WINDS
LATER SATURDAY AND INCREASING PRESSURE GRADIENTS ON SUNDAY.
CHANCES FOR GUSTS UP TO 25 KT RETURN SUNDAY AFTERNOON, MAINLY
ACROSS THE CENTRAL AND SOUTHERN WATERS OUT TO 30-40 NM. 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. -19/DH
PQR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
PZ...NONE.
WWW.WEATHER.GOV/PORTLAND
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSPORTLAND
X.COM/NWSPORTLAND
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