219
FXUS66 KPQR 071110 AAA
AFDPQR
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PORTLAND OR
410 AM PDT TUE JUL 7 2026
UPDATED AVIATION DISCUSSION
SYNOPSIS
FAIRLY SEASONABLE EARLY JULY CONDITIONS CONTINUE
THE REST OF THE WEEK INTO THE WEEKEND. EXPECT A GRADUAL COOLING
TREND THROUGH WEDNESDAY AS AN UPPER-LEVEL TROUGH PASSES NORTH OF
THE REGION AND INCREASES ONSHORE FLOW LOCALLY WHILE ALLOWING
FOR MORE PROLIFIC MORNING LOW CLOUDS, ESPECIALLY WEDNESDAY
MORNING. TEMPERATURES REMAIN FAIRLY CLOSE TO NORMAL INTO THE
FIRST HALF OF THE WEEKEND BEFORE A RIDGE OF HIGH PRESSURE
AMPLIFYING TO OUR EAST ALLOWS TEMPERATURES TO TREND WARMER INTO
EARLY NEXT WEEK.
SHORT TERM...TODAY THROUGH THURSDAY
TODAY AND TOMORROW,
BOTH DETERMINISTIC AND ENSEMBLE GUIDANCE REMAIN IN EXCELLENT
AGREEMENT DEPICTING AN UPPER-LEVEL TROUGH FROM THE GULF OF
ALASKA MOVING EAST/SOUTHEAST INTO BRITISH COLUMBIA HELPING TO
DE-AMPLIFY THE HIGH PRESSURE ANCHORED OVER THE GREAT BASIN. THE
BULK OF THE TROUGH IS EXPECTED TO STAY WELL NORTH OF OUR CWA
KEEPING THE REGION PREDOMINATELY DRY. HOWEVER, COULD SEE A
CHANCE FOR SOME LIGHT DRIZZLE/VERY LIGHT RAIN ALONG THE FAR
NORTHERN OREGON AND THE SOUTHERN WASHINGTON COAST, MAINLY ON
WEDNESDAY MORNING. DESPITE THE GENERAL LACK OF PRECIPITATION,
THIS SYSTEM WILL INCREASE ONSHORE FLOW KEEPING DAYTIME HIGHS
NEAR SEASONAL NORMALS THROUGH THE MID-WEEK. WEST-NORTHWESTERLY
WINDS ARE GENERALLY EXPECTED TO BE LIGHT FOR MOST AREAS DURING
THROUGH WEDNESDAY. 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 THROUGH WEDNESDAY. AS THURSDAY
APPROACHES THE GULF OF ALASKA TROUGH MENTIONED ABOVE WILL BE
WELL INLAND AND INTO THE ALBERTA PROVINCE OF CANADA. AS THIS LOW
CONTINUES TO LOOSE SYNOPTIC INFLUENCE OVER THE PAC NW, THE
GREAT BASIN HIGH WILL START TO RE-AMPLIFY INTO THE REGION
BRINGING ABOUT A WARMING TREND FOR THE LATTER PART OF THE WEEK
AND INTO THE WEEKEND, BUT MORE ON THAT IN THE LONG TERM
DISCUSSION BELOW. /42-99
LONG TERM...FRIDAY THROUGH MONDAY
AS MENTIONED ABOVE, THE
GREAT BASIN HIGH IS EXPECTED TO STRENGTHEN WHILE AN ADDITIONAL
TROUGH SLOWLY DROPS INTO THE NORTHEASTERN PACIFIC FROM THE THE
GULF OF ALASKA. THIS SYSTEM LOOKS TO MITIGATE THE GREAT BASIN
HIGH, THUS KEEPING A MORE ZONAL FLOW PATTERN IN THE FORECAST
THROUGH THE WEEKEND. HOWEVER, THE EXACT STRENGTH AND TRACK OF
THIS LOW IS RESULTING IN A FAIR AMOUNT OF UNCERTAINTY. STILL,
ENSEMBLE MODELS ARE AT LEAST MAINTAINING NORTH/NORTHWEST FLOW AT
THE SURFACE. HOWEVER, GUIDANCE IS SHOWING SOUTHWESTERLY FLOW
ALOFT WHICH IS CAUSING THE WARMING TREND SEEN WITHIN VARIOUS
MODELS AND THEIR FAMILIES. STILL, OVERALL DAYTIME HIGHS ARE
LOOKING TO REMAIN NEAR NORMAL OR SLIGHTLY WARMER THAN NORMAL
FOR THE LATTER PART OF THIS WEEK AND THROUGH THE START OF NEXT
WEEK. /42
AVIATION
ONSHORE FLOW WILL MAINTAIN A TYPICAL SUMMERTIME
PATTERN ACROSS THE REGION. MVFR TO IFR MARINE STRATUS CONTINUES
TO PERSIST ALONG THE COAST WHICH IS IMPACTING ALL COASTAL SITES.
THIS MARINE STRATUS IS EXPECTED TO INFILTRATE ALONG THE COLUMBIA
RIVER AS WELL AS THROUGH THE GAPS AND FLOWS OF THE COAST RANGE,
THUS BRINGING MVFR CONDITIONS TO KEUG AROUND 12Z-14Z TUESDAY AND
A 15-30% CHANCE FOR LOW-END VFR/ HIGH-END MVFR CONDITIONS AT ALL
OTHER INLAND TAF SITES. ANY LOWERED FLIGHT CONDITIONS FOR INLAND
LOCATIONS SHOULD IMPROVE TO VFR AROUND 17Z-20Z TUESDAY WITH
COASTAL LOCATIONS LIKELY IMPROVING TOWARDS LOW-END VFR/ HIGH-END
MVFR AROUND 20Z-23Z TUESDAY. NORTH/NORTHWEST WINDS 10-15 KT OR
LESS EXPECTED THROUGHOUT THE MAJORITY OF THE TAF PERIOD, ACROSS
THE AIRSPACE. HOWEVER, COULD SEE GUSTS UP TO 25 KT ALONG THE COAST
FROM 18Z TUESDAY THROUGH 03Z WEDNESDAY AS WELL AS GUSTS UP TO 20
KT FOR INLAND LOCATIONS THROUGH THE SAME TIME PERIOD.
KPDX AND APPROACHES...PREDOMINATELY VFR CONDITIONS EXPECTED
THROUGH THE TAF PERIOD. 15-20% CHANCE OF LOW-END VFR/ HIGH-END
MVFR CONDITIONS DEVELOPING FROM 12Z-16Z TUESDAY AS MARINE STRATUS
MEANDERS DOWN THE COLUMBIA RIVER. ANY LOWERED FLIGHT CONDITIONS
SHOULD IMPROVE TO VFR STARTING AROUND 16Z TUESDAY. NORTH/NORTHWEST
WINDS 10-15 KT OR LESS EXPECTED THROUGHOUT THE MAJORITY TAF
PERIOD. HOWEVER, COULD SEE GUSTS UP TO 20 KT FROM 20Z TUESDAY
THROUGH 05Z WEDNESDAY. /42
MARINE
A BROAD, UPPER LEVEL TROUGH WILL SLOWLY DROP OUT OF THE
GULF OF ALASKA THROUGH WEDNESDAY. THIS WILL MAINTAIN NORTHERLY
WINDS GENERALLY 15 KT OR LESS ACROSS ALL WATERS WITH SEAS OF 5 TO
7 FT. WINDS BRIEFLY INCREASE WEDNESDAY AND THURSDAY EVENINGS, WITH
GUSTS UP TO 20 KT, STRONGEST ACROSS THE COASTAL WATERS SOUTH OF
CAPE FOULWEATHER. OVERALL, RELATIVELY BENIGN CONDITIONS EXPECTED
TO CONTINUE THROUGH THE WEEK AND INTO THE WEEKEND. /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
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page