288  
FXUS66 KPQR 101700 AAA  
AFDPQR  
 
AREA FORECAST DISCUSSION...UPDATED  
NATIONAL WEATHER SERVICE PORTLAND OR  
1000 AM PDT THU JUL 10 2025  
 
UPDATED AVIATION AND MARINE DISCUSSIONS  
   
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 ACROSS THE AIR SPACE WILL SLOWLY SCOUR  
OUT RESULTING IN A MIXTURE OF VFR/MVFR CONDITIONS FOR INLAND  
LOCATIONS AND A MIXTURE OF ALL FLIGHT CONDITIONS ALONG THE COAST,  
WITH MOST LOCATIONS ALONG THE COAST BEING IN VFR OR MVFR  
CONDITIONS. CURRENTLY, WINDS VARIABLE UNDER 5 KTS, BUT NORTHERLY  
WINDS PICK UP AROUND 20Z THURSDAY AND CONTINUE THROUGH 02Z FRIDAY  
WITH GUSTS UP TO 20 KTS POSSIBLE AT ALL TERMINALS.  
 
WESTERLY FLOW CONTINUES ACROSS NW OREGON AND SW WASHINGTON THROUGH  
THE TAF PERIOD. AS A RESULT, EXPECT SIMILAR CONDITIONS AS TO WHAT  
HAS BEEN OBSERVED OVER THE PAST 24-48 HOURS. EXPECT COASTAL  
CONDITIONS TO DEVELOP IFR/LIFR CONDITIONS AROUND 00Z-03Z FRIDAY  
FOR INLAND LOCATIONS, WHILE ONSHORE FLOW WILL BE PRESENT, IT WILL  
BE NORTHERLY AND THIS PATTERN WILL MITIGATE ANY MARINE STRATUS  
INFILTRATING THROUGH THE GAPS AND FLOWS AS WELL AS THE COLUMBIA  
RIVER. HOWEVER, MODELS ARE SHOWING SOME BACKBUILDING CLOUDS OFF  
THE CASCADES AND THAT COULD BRING SOME MVFR FLIGHT CONDITIONS TO  
NORTHERLY (KPDX,KTTD,KVUO) AND SOUTH/CENTRAL (KSLE AND KEUG)  
TERMINALS. THESE CONDITIONS WILL LIKELY START AROUND 10Z-12Z  
FRIDAY. AFTEWARDS, ACROSS THE AIRSPACE EXPECT ANY LOWERED FLIGHT  
CONDITIONS THAT DEVELOPED TO SLOWLY IMPROVE STARTING AROUND  
12Z-15Z FRIDAY.  
 
PDX AND APPROACHES...PREDOMINATELY VFR CONDITIONS THROUGH THE  
MAJORITY OF THE TAF PERIOD. BACKBUILDING CLOUDS OFF THE CASCADES  
WILL LIKELY BRING MVFR CONDITIONS TO THE THE TERMINAL AND EASTWARD  
STARTING AROUND 12Z FRIDAY. CONDITIONS EXPECTED TO IMPROVE BACK  
TOWARDS VFR AROUND 16Z-18Z FRIDAY. WINDS VARIABLE UNDER 5 KTS,  
BUT NORTHERLY WINDS PICK UP AROUND 20Z THURSDAY AND CONTINUE  
THROUGH 02Z FRIDAY WITH GUSTS UP TO 20 KTS POSSIBLE. /42  
 

 
   
MARINE
 
NORTH/NORTHWEST WINDS ACROSS ALL WATERS 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...NONE.  
 

 
 

 
 
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