067
FXUS66 KPQR 061807 AAC
AFDPQR
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PORTLAND OR
1107 AM PDT MON JUL 6 2026
UPDATED AVIATION AND MARINE DISCUSSIONS
SYNOPSIS
WARM AND SUNNY CONDITIONS CONTINUE THROUGH THE
REMAINDER OF THE WEEK. HIGH PRESSURE TODAY WILL RESULT IN THE
WARMEST TEMPERATURES THIS WEEK. THIS WILL RESULT IN LOCALIZED
MODERATE HEATRISK ACROSS THE INNER PORTLAND METRO, COLUMBIA
RIVER GORGE, AND UPPER HOOD RIVER VALLEY. AN UPPER-LEVEL TROUGH
MOVING INTO BRITISH COLUMBIA TOMORROW WILL COOL TEMPERATURES A
FEW DEGREES AND ALSO BRING A 15-20% CHANCE FOR LIGHT RAIN ALONG
THE SOUTH WASHINGTON AND NORTH OREGON COAST ON WEDNESDAY. BROAD
TROUGHING WILL CONTINUE THROUGH THE WEEK AND BRING PERSISTENT
ONSHORE FLOW, WHICH WILL MAINTAIN SEASONABLE TEMPERATURES.
SHORT TERM...TODAY THROUGH WEDNESDAY
THE WARMEST DAY OF THE
WEEK IS EXPECTED TODAY WITH HIGH TEMPERATURES PEAKING IN THE
UPPER 80S TO LOW 90S ACROSS INTERIOR VALLEYS WHILE THE COAST
REMAINS IN THE LOW 60S TO LOW 70S. CHANCES FOR EXCEEDING 90
DEGREES REMAIN AROUND 10-35% CHANCE ACROSS THE WILLAMETTE
VALLEY, 50-75% CHANCE ALONG THE CENTRAL COLUMBIA RIVER GORGE THE
UPPER HOOD RIVER VALLEY, AND LESS THAN 10% FOR THE REST OF THE
INTERIOR VALLEYS. FOR THE WILLAMETTE VALLEY, THE CENTRAL
COLUMBIA RIVER GORGE AND THE UPPER HOOD RIVER VALLEY, THERE WILL
BE SOME LOCALIZED MODERATE HEATRISK, MEANING THIS LEVEL OF HEAT
WILL AFFECT THOSE SENSITIVE TO HEAT, ESPECIALLY THOSE WITHOUT
ADEQUATE COOLING OR HYDRATION. LOW TEMPERATURES TONIGHT AND INTO
TUESDAY MORNING ARE EXPECTED TO BE IN THE UPPER 40S TO MID 50S
ACROSS THE ENTIRE AREA SHOULD PROVIDE DECENT OVERNIGHT RELIEF
FROM THE HEAT.
TUESDAY TO WEDNESDAY, ENSEMBLE GUIDANCE REMAINS IN VERY GOOD TO
EXCELLENT AGREEMENT THAT AN UPPER-LEVEL TROUGH FROM THE GULF OF
ALASKA MOVING EAST/SOUTHEASTWARD INTO BRITISH COLUMBIA WILL HELP
TO DE-AMPLIFY THE HIGH PRESSURE ANCHORED OVER THE GREAT BASIN.
THIS SYSTEM IS EXPECTED TO STAY NORTHWARD OF OUR CWA, KEEPING
NORTHWEST OREGON AND SOUTHWEST WASHINGTON PREDOMINATELY DRY.
HOWEVER, COULD SEE A 15-20% CHANCE FOR VERY LIGHT PRECIPITATION
ALONG THE NORTH OREGON AND SOUTH WASHINGTON COAST. DESPITE THE
LACK OF PRECIPITATION, THIS SYSTEM WILL STILL MAINTAIN
RELATIVELY COOL, ONSHORE FLOW AND KEEP HELP TO KEEP TEMPERATURES
NEAR SEASONAL NORMALS. WEST- NORTHWESTERLY WINDS ARE GENERALLY
EXPECTED TO BE LIGHT FOR MOST AREAS DURING THIS TIME. HOWEVER,
WILL SEE LOCALLY BREEZIER WINDS ALONG THE CENTRAL COLUMBIA RIVER
GORGE AND UPPER HOOD RIVER VALLEY, WHERE THERE IS A 30-45%
CHANCE FOR AT LEAST ISOLATED WIND GUSTS EXCEEDING 40 MPH TUESDAY
AND WEDNESDAY.
IT IS IMPORTANT TO REMEMBER THAT WHILE TEMPERATURES WILL BE
WARM, MANY LOCAL LAKES AND RIVERS REMAIN VERY COLD AND CAN CAUSE
COLD WATER SHOCK. ALSO, RIVERS MAY STILL HAVE SWIFT CURRENTS IN
SOME AREAS, WHICH CAN QUICKLY SWEEP YOU AWAY. PLEASE PRACTICE
WATER SAFETY BY WEARING PERSONAL FLOATATION DEVICES, VISITING
WITH A BUDDY, AND ALWAYS BEING AWARE OF YOUR SURROUNDINGS.
/42-10
LONG TERM...THURSDAY THROUGH SUNDAY
THURSDAY, MOST ENSEMBLE
MEMBERS SHOW THE AFOREMENTIONED TROUGH WEAKENING AS IT CONTINUES
TO MOVE EASTWARD THROUGH BRITISH COLUMBIA AND INTO ALBERTA. AS
THE TROUGH LOOSES SYNOPTIC INFLUENCE OVER THE PAC NW, THE GREAT
BASIN HIGH IS EXPECTED TO BRIEFLY STRENGTHEN THUS RETURNING
DRY, ZONAL FLOW OVER THE REGION. HOWEVER, THE ZONAL FLOW LOOKS
TO BE RATHER SHORT LIVED AS BY THE LATTER PART OF THE WEEK,
ENSEMBLE MEMBERS ARE SHOWING ADDITIONAL TROUGHING MOVING DOWN
FROM THE GULF OF ALASKA INTO THE NORTHEAST PACIFIC/BRITISH
COLUMBIA REGION. THERE STILL REMAINS A FAIR AMOUNT OF UNCERTAINTY
IN THE FORECAST FOR THE LATTER PART OF THIS WEEK AND INTO THE
WEEKEND AS TO THE EXACT PLACEMENT AND MAGNITUDE OF THIS EASTERN
PACIFIC TROUGH, BUT ENSEMBLES ARE KEEPING THIS SYSTEM WELL TO
OUR NORTH TO KEEP US DRY, WITH NEAR TO SLIGHTLY COOLER THAN
NORMAL TEMPERATURES. /42
AVIATION
SOUTHWEST FLOW ALOFT AS THE REGION REMAINS UNDER WEAK
UPPER LEVEL TROUGHING. ONSHORE FLOW WILL RETURN IN THE LOWER
LEVELS TODAY WITH MARINE STRATUS PERSISTING NEAR THE CENTRAL
OREGON COAST WITH IFR CIGS LIKELY TO CONTINUE AT KONP. VFR
CONDITIONS EXPECTED FOR INLAND TERMINALS THROUGH AT LEAST 12Z
TUESDAY WITH SCATTERED HIGH LEVEL CLOUDS. EXPECT IFR TO LIFR
MARINE STRATUS TO PUSH ONSHORE AGAIN THIS EVENING ALONG THE COAST,
WITH CHANCES FOR LOW-END MVFR TO IFR CONDITIONS INCREASING TO OVER
60% AFTER 02-04Z TUE. THERE IS AROUND A 10-20% CHANCE FOR STRATUS
WITH MVFR CIGS TO REACH INLAND TERMINALS AFTER 12Z TUE. NORTHWEST
WINDS INCREASE THIS AFTERNOON WITH GUSTS UP TO 20 KT, STRONGEST
AT THE COAST.
KPDX AND APPROACHES...PREDOMINATELY VFR CONDITIONS EXPECTED
THROUGH AT LEAST 12Z TUESDAY. THERE ARE LOW CHANCES (10-20%) OF
MVFR STRATUS DEVELOPING AFTER 12Z TUE. NORTHWEST WINDS EXPECTED TO
INCREASE THIS AFTERNOON TO AROUND 6-8 KT. /DH
MARINE
HIGH PRESSURE IS RESULTING IN BREEZY NORTHERLY WINDS
ACROSS THE WATERS WITH GUSTS UP TO 20 KT AND CHOPPY SEAS OF 6 TO
8 FT THIS MORNING. HOWEVER, A PATTERN CHANGE IS EXPECTED TO OCCUR
TODAY AS A BROAD, UPPER LEVEL ALASKAN TROUGH MOVES SOUTHEAST INTO
WESTERN CANADA. THIS WILL RESULT IN DECREASING WINDS AND SEAS.
EXPECT NORTHERLY WINDS TO PERSIST, WITH GUSTS BELOW 15 KT AND
SEAS OF 5 TO 7 FT THROUGH THE REMAINDER OF THE WEEK. 42/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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