209
FXUS66 KPQR 091056 AAA
AFDPQR
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PORTLAND OR
356 AM PDT THU JUL 9 2026
SYNOPSIS
PERSISTENT ONSHORE FLOW WILL CONTINUE TO YIELD DRY
AND SEASONABLE WEATHER THROUGH THIS WEEKEND. DAYTIME HIGHS TREND
WARMER EARLY NEXT WEEK AS HIGH PRESSURE BUILDS OVER THE GREAT
BASIN. AFTER THE MIDDLE OF NEXT WEEK, UNCERTAINTY INCREASES IN
THE EXACT FORECAST, BUT A WARMING AND DRYING TREND IS EXPECTED.
DISCUSSION...TODAY THROUGH WEDNESDAY
MINIMAL CHANGES IN THE
OVERALL SYNOPTIC PATTERN THROUGH THE REMAINDER OF THE WEEK. A
BROAD, UPPER LEVEL TROUGH WILL CONTINUE TO PUSH SOUTH AND EAST
THROUGH BRITISH COLUMBIA, WHILE A BROAD AREA OF HIGH PRESSURE
REMAINS ANCHORED OVER THE GREAT BASIN. THIS SYNOPTIC SET-UP IS
RESULTING IN ZONAL FLOW ALOFT AND ONSHORE FLOW AT THE SURFACE.
THIS PATTERN WILL HELP TO MAINTAIN NEAR NORMAL DAYTIME HIGHS
ACROSS THE FORECAST AREA AS WELL AS SLIGHTLY COOLER THAN NORMAL,
OVERNIGHT LOWS.
AS THE START OF NEXT WEEK APPROACHES, ANOTHER UPPER LEVEL
TROUGH OR CLOSED LOW, LOOKS TO DIVE SOUTHWARD OUT OF THE GULF OF
ALASKA AND MOVE INTO BRITISH COLUMBIA. WHICH WILL RESULT IN THE
UPPER LEVEL FLOW PATTERN BECOMING SOUTHWESTERLY. IN ADDITION TO
THE ALASKAN SYSTEM, THE GREAT BASIN HIGH WILL ALSO RE-BUILD.
THIS GENERAL PATTERN CHANGE WILL RESULT IN A SLIGHT WARMING
TREND STARTING SUNDAY AND CONTINUING THROUGH THE MIDDLE OF THE
WEEK. EXPECT HIGH TEMPERATURES THROUGH THE FIRST HALF OF NEXT
WEEK TO REACH THE MID TO UPPER 80S INLAND AND MID 60S TO NEAR 70
DEGREES ALONG THE COAST, WHILE OVERNIGHT LOWS SIMILARLY PUSH A
FEW DEGREES WARMER INTO THE MID 50S ACROSS THE REGION. THIS
COMBINATION OF TEMPERATURES CONTINUES TO SUPPORT WIDESPREAD
MINOR HEATRISK ACROSS THE MAJORITY OF THE REGION WITH ISOLATED
AREAS OF MODERATE HEATRISK IN THE PORTLAND/VANCOUVER METRO AND
THROUGH THE COLUMBIA GORGE, ESPECIALLY ON TUESDAY.
THERE REMAINS A BROAD REGION FROM SALEM NORTH THROUGH THE LOWER
COWLITZ VALLEY AND EAST ALONG THE I-84 CORRIDOR THROUGH THE
GORGE WHERE THERE IS A 20-50% CHANCE OF MODERATE HEATRISK ON
BOTH MONDAY AND TUESDAY IF FORECAST TEMPERATURES TREND WARMER,
WITH THE HIGHEST LIKELIHOOD IN THE LOWER TUALATIN VALLEY (BEAVERTON,
TIGARD, TUALATIN) AND NEIGHBORING PORTIONS OF MULTNOMAH AND
CLACKAMAS COUNTIES (PORTLAND, WILSONVILLE). CHANCES FOR MAJOR
HEATRISK ARE 10% OR LESS ACROSS THE REGION. UNCERTAINTY IN THE
TEMPERATURE FORECAST INCREASES BEYOND WEDNESDAY AS CONSENSUS IS
RELATIVELY LOW IN THE LONG-TERM EVOLUTION OF THE STRONG UPPER
RIDGE. NONETHELESS, CHANCES FOR RAIN REMAIN MINIMAL THROUGH THE
PERIOD. /42-36
AVIATION
GENERALLY VFR THROUGH THE ENTIRE TAF PERIOD FOR INLAND
LOCATIONS. COASTAL TERMINALS WILL LIKELY EXPERIENCE INTERMITTENT
MVFR/IFR CONDITIONS THROUGH 18Z THURSDAY MARINE STRATUS SLOWLY
DEVELOPS ALONG THE COAST. ALONG THE COAST THERE IS A 20-30%
CHANCE FOR MVFR CONDITIONS TO DEVELOP ALONG WITH A 10-20%
CHANCE OF IFR CONDITIONS DEVELOPING, HIGHER NEAR KAST. IF
LOWERED FLIGHT CONDITIONS DEVELOP, EXPECT IMPROVEMENT TOWARDS
VFR AFTER 18Z THURSDAY. HOWEVER,GUIDANCE SUGGESTS THE POTENTIAL
OF MVFR/IFR CONDITIONS TO RETURN TO THE COAST AROUND 03Z-05Z
FRIDAY. NORTH TO NORTHWEST WINDS THROUGH THE TAF PERIOD, 5-10 KT
WITH AFTERNOON GUSTS UP TO 20 KT POSSIBLE AT INLAND TERMINALS
FROM 00Z-06Z FRIDAY AND 7-15 KT WITH AFTERNOON GUSTS UP TO 25 KT
POSSIBLE AT COASTAL TERMINALS FROM 18Z THURSDAY THROUGH 04Z
FRIDAY.
KPDX AND APPROACHES...VFR THROUGH THE TAF PERIOD. NORTHWEST WINDS
AROUND 5-10 KT WITH GUSTS UP TO 20 KT FROM 00Z-06Z FRIDAY. /42
MARINE
NORTH TO NORTHWEST WINDS ACROSS ALL WATERS THROUGH
THE WEEKEND. WINDS GENERALLY REMAIN AROUND 15 KT OR LESS, THOUGH
PRESSURE GRADIENTS ARE EXPECTED TO TIGHTEN THIS AFTERNOON AND
EVENING WHICH WILL RESULT IN A 10-20% CHANCE OF GUSTS UP TO 25
KT FOR LOCATIONS SOUTH OF CAPE FOULWEATHER. THERE IS ALSO A
5-15% CHANCE FOR GUSTS UP TO 22 KT FOR LOCATIONS SOUTH OF CAPE
FALCON FOR THE SAME TIME PERIOD. 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. /42
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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