979  
FXUS66 KPQR 101036  
AFDPQR  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PORTLAND OR  
336 AM PDT THU JUL 10 2025  
   
SYNOPSIS  
DRY WITH SEASONABLE TEMPERATURES FOR INTERIOR  
VALLEYS THIS AFTERNOON. HIGH PRESSURE BUILDS FRIDAY INTO THE  
WEEKEND, LEADING TO MUCH WARMER TEMPERATURES. INCREASING  
POTENTIAL FOR TRIPLE DIGITS INLAND NEXT TUE/WED.  
 
 
   
SHORT TERM...NOW THROUGH FRIDAY NIGHT  
EXPECT ANOTHER DAY WITH  
NEAR NORMAL TEMPS AS WEAK TROUGHING REMAINS IN PLACE ACROSS THE  
PACNW. THE DAY WILL START OUT PARTY TO MOSTLY CLOUDY, CLEARING  
THROUGH THE DAY. HIGHS IN THE UPPER 70S TO LOW 80S EXPECTED  
INLAND WITH LOW TO MID 60S EXPECTED ALONG THE COAST. FRIDAY WILL  
SEE TEMPS JUMP 8-12 DEGREES FOR MOST INLAND LOCATIONS AS HIGH  
PRESSURE BUILDS ACROSS THE NORTHEAST PACIFIC ALONG WITH  
THERMALLY INDUCED LOW PRESSURE OVER THE WILLAMETTE VALLEY. HIGHS  
IN THE UPPER 80S TO AROUND 90 DEGREES EXPECTED INLAND WHILE THE  
COAST WARMS A FEW DEGREES INTO THE MID 60S TO LOW 70S. -BATZ  
 
   
LONG TERM...SATURDAY THROUGH TUESDAY  
FOR THE WEEKEND, THE HEAT IS ON.  
WPC 500 MB CLUSTER GUIDANCE CONTINUES TO SHOW VERY GOOD  
AGREEMENT AS A RIDGE OF HIGH PRESSURE BUILDING AND STRENGTHENING  
OVER THE EASTERN PACIFIC AND PAC NW THROUGH AT LEAST EARLY NEXT  
WEEK. THERE ARE SOME SLIGHT VARIATIONS IN EXACT STRENGTH AND  
PLACEMENT OF THE RIDGE OVER THE REGION, BUT A PROLONGED PERIOD  
OF UPPER 80S TO LOW 90S THROUGHOUT THE WILLAMETTE VALLEY LOOK  
GOOD. THERE IS ALSO A DECENT CHANCE (30-70%) FOR WIDESPREAD  
TRIPLE DIGITS THROUGHOUT THE WILLAMETTE VALLY AND INTERIOR  
LOWLANDS NEXT TUESDAY AND WEDNESDAY.  
 
PROBABILITIES FOR HIGHS TO REACH 95 OR GREATER FROM SALEM TO EUGENE  
ON SATURDAY ARE 30-50%, ON SUNDAY IT IS 70-90% AND ON MONDAY IT IS  
30-50%. PROBABILITIES AROUND THE PORTLAND/VANCOUVER METRO ON  
SATURDAY ARE 10%, ON SUNDAY 30-50% AND MONDAY TO 10-20%. AT THIS  
TIME, HEATRISK IS EXPECTED TO REMAIN MODERATE THROUGH MONDAY. THERE  
IS A SLIM CHANCE (AROUND 10%) FOR A FEW LOCATIONS IN THE CENTRAL AND  
SOUTHERN WILLAMETTE VALLEY TO REACH 100 SUNDAY AND MONDAY. CHANCES  
FOR TRIPLE DIGITS INCREASE DRAMATICALLY TUESDAY AND WEDNESDAY AS THE  
RIDGE STRENGTHENS. PROBABILITIES FOR HIGHS TO REACH 100 OR GREATER  
FOR VARIOUS LOCATIONS IN OUR FORECAST AREA ON TUESDAY AND WEDNESDAY  
(7/15/2025, 7/16/25):  
 
PORTLAND/VANCOUVER METRO: 30-60%, 50-80%  
SALEM: 60-70%, 50-70%  
EUGENE: 50-70%, ~50%  
BATTLE GROUND: 30-40%, 40-50%  
KELSO/LONGVIEW: 15-30%, 30-40%  
ASTORIA: LESS THAN 1% BOTH DAYS  
HOOD RIVER: 15-30% BOTH DAYS  
NEWPORT: LESS THAN 1% BOTH DAYS  
OAKRIDGE: 5-10% BOTH DAYS  
 
TEMPS HAVE TRENDED TOWARD THE UPPER 90S TO LOW 100S FOR TUESDAY AND  
WEDNESDAY, PUSHING HEATRISK VALUES TO MAJOR FOR PORTIONS OF THE  
WILLAMETTE VALLEY AND COLUMBIA RIVER GORGE.  
 
IN ADDITION TO THE UPPER LEVEL HIGH PRESSURE, MODELS ARE ALSO  
SHOWING THE DEVELOPMENT OF A THERMALLY INDUCED TROUGH SLOWLY  
SPREADING NORTHWARD INTO THE WILLAMETTE VALLEY TOWARDS THE START OF  
NEXT WEEK. IF THIS SOLUTION WITHIN THE MODELS DOES MANIFEST, THEN  
WILL LIKELY RESULT IN OFFSHORE FLOW. LASTLY, EXPECT MOST OF THE AREA  
TO REMAIN DRY THROUGH THE END OF THE LONG TERM IE NO PRECIPITATION  
IN THE FORECAST AT THIS TIME. HOWEVER, MODELS ARE HINTING AT A  
POSSIBLE PATTERN CHANGE COME WEDNESDAY/THURSDAY AND THAT COULD BRING  
SOME VERY LIGHT PRECIPITATION INTO THE FORECAST, BUT MODEL  
PROBABILITIES ARE TOO LOW TO WARRANT INCLUSION OF ANY PRECIPITATION  
IN THE FORECAST FOR NOW, BUT WILL CONTINUE TO MONITOR AS MODELS  
START TO BETTER RESOLVE THIS FEATURE IN THE COMING DAYS.  
-BATZ/42  
 
 
   
AVIATION  
MARINE STRATUS DEVELOPING AT THE COAST AND OFF THE  
WESTERN SLOPES OF THE CASCADES, ALLOWING FOR LIFR CIGS AT THE  
COAST SOUTHWARDS FROM KTMK, AND MVFR STRATUS FOR THE EASTERN  
WILLAMETTE VALLEY. THESE CONDITIONS CONTINUE UNTIL AROUND 18-20Z  
THU, WITH SOME IMPROVEMENT TO IFR/MVFR AT THE COAST AND VFR  
INLAND. WINDS CURRENTLY FAIRLY WEAK, VARIABLE UNDER 5 KTS, BUT  
NORTHERLY WINDS PICK UP FROM 18Z THU ONWARDS. GUSTS UP TO 20 KTS  
POSSIBLE AT ALL TERMINALS.  
 
WESTERLY FLOW CONTINUES ACROSS NW OREGON AND SW  
WASHINGTON, BECOMING NORTHERLY AFTER 16Z THU. IFR/LIFR CONDITIONS  
EXPECTED ALONG THE COAST WITH CIGS AROUND FL003-FL009 AND VSBYS  
BOUNCING BETWEEN 1/4 SM AND 2 SM. CONDITIONS ARE EXPECTED TO  
IMPROVE TO MVFR/VFR NORTH OF KTMK BETWEEN 07-10Z THU AND SOUTH OF  
KTMK BETWEEN 10-14Z THU. FOR INLAND LOCATIONS, THE ONSHORE FLOW IS  
CAUSING STRATUS TO FORM ON THE WESTERN BANKS OF THE CASCADES AS  
OF 04Z THU. THIS STRATUS IS EXPECTED TO SLOWLY BACKFILL WEST INTO  
THE WILLAMETTE VALLEY, THOUGH GUIDANCE IS UNCERTAIN ON HOW FAR  
STRATUS COULD SPREAD. MOST TERMINALS COULD SEE A COUPLE OF HOURS  
OF MVFR CIGS AT SOME POINT, THOUGH TERMINALS IN THE CENTRAL  
WILLAMETTE VALLEY SUCH AS KUAO AND KSLE HAVE HIGHER PROBABILITIES  
(70-80%) OF MVFR CIGS. EXPECT INLAND LOCATIONS TO RECOVER TO VFR  
BY 16-19Z THU.  
 
PDX AND APPROACHES...VFR CONDITIONS THROUGH THE MAJORITY OF THE  
TAF PERIOD. THERE'S A 30-60% CHANCE OF MVFR CIGS BETWEEN 10-15Z  
THU. WINDS OUT OF THE NORTH/NORTHWEST AT LESS THAN 10 KT. -JLUI  
 
 
   
MARINE  
DUE TO UPWELLING, SIGNIFICANT MARINE FOG HAS DEVELOPED  
THROUGHOUT ALL WATERS. THIS WILL RESULT IN VISIBILITIES ACROSS  
ALL WATERS LIKELY FALLING BELOW 1 NM OR LESS TONIGHT THROUGH  
TOMORROW MORNING. DENSE FOG ADVISORY HAS BEEN ISSUED THROUGH 11AM  
THU.  
 
A WEAK FRONTAL PASSAGE LATE TONIGHT/EARLY THURSDAY WILL BRING  
ABOUT A BRIEF SOUTHERLY WIND SHIFT THE REST OF TONIGHT.  
NORTH/NORTHWEST WINDS WILL RETURN ACROSS ALL WATERS BY LATE  
THURSDAY MORNING AND PERSIST THROUGH THE WEEKEND AS A BROAD AREA  
OF HIGH PRESSURE AND A THERMALLY INDUCED TROUGH SPREADS NORTHWARD.  
AS THE HIGH PRESSURE AND ASSOCIATED THERMALLY INDUCED TROUGH  
MATURE, EXPECT GUSTY NORTHERLY WINDS AND CHOPPIER WIND DRIVEN  
SEAS, PARTICULARLY SOUTH OF CAPE FALCON. WINDS AND SEAS WILL BE  
STRONGEST OFF THE CENTRAL COAST OF OREGON AND WILL TYPICALLY PEAK  
IN THE AFTERNOON AND EVENING HOURS OVER THE INNER WATERS EACH DAY  
THROUGH THE WEEKEND. /42  
 
 
   
PQR WATCHES/WARNINGS/ADVISORIES  
 
OR...NONE.  
WA...NONE.  
PZ...DENSE FOG ADVISORY UNTIL 11 AM PDT THIS MORNING FOR PZZ210-  
251>253-271>273.  
 
 
 
 
WWW.WEATHER.GOV/PORTLAND  
 
INTERACT WITH US VIA SOCIAL MEDIA:  
WWW.FACEBOOK.COM/NWSPORTLAND  
X.COM/NWSPORTLAND  
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