313  
FXUS66 KPQR 080306 AAA  
AFDPQR  
 
AREA FORECAST DISCUSSION...UPDATE  
NATIONAL WEATHER SERVICE PORTLAND OR  
805 PM PDT MON JUL 7 2025  
 
UPDATED AVIATION DISCUSSION  
   
SYNOPSIS  
HIGH PRESSURE LINGERS THROUGH TUESDAY WITH AN UPPER  
LEVEL LOW NEAR NORTHERN CALIFORNIA. TEMPERATURES WILL BE IN THE  
UPPER 80S TO LOW 90S THROUGH TUESDAY, BUT WILL QUICKLY COOL ON  
WEDNESDAY AS THE CALIFORNIA LOW MOVES INLAND. SLIGHT CHANCE FOR  
SHOWERS ON WEDNESDAY IN SOUTHWEST WASHINGTON. WARMER  
TEMPERATURES RETURN FOR THE LATTER PART OF THE WEEK AND INTO THE  
WEEKEND AS A WEAK UPPER LEVEL RIDGING IS EXPECTED TO RETURN.  
 
 
   
SHORT TERM...TONIGHT THROUGH WEDNESDAY NIGHT  
HIGH PRESSURE  
CONTINUES TO LINGER OVER THE NORTHEAST PACIFIC WHICH WILL KEEP  
CONDITIONS DRY AND WARM THROUGH TUESDAY. TODAY AND TUESDAY WILL  
BE VERY SIMILAR AS THE OVERALL PATTERN IS NOT EXPECTED TO CHANGE  
SIGNIFICANTLY UNTIL LATE TUESDAY/EARLY WEDNESDAY. DAYTIME HIGHS  
TOMORROW ARE EXPECTED TO BE IN THE UPPER 80S TO LOW 90S, UPPER  
60S TO LOW 70S ALONG THE COAST AND MID 70S TO MID 80S FOR THE  
CASCADES. OVERALL, EXPECT DAYTIME HIGHS TOMORROW TO BE JUST A  
TAD COOLER THAN TODAY. THERE REMAINS A MODERATE HEATRISK FOR  
THE INLAND VALLEYS INCLUDING THE GORGE AND VALLEYS WITHIN THE  
CASCADE FOOTHILLS THROUGH TUESDAY.  
 
AS WEDNESDAY APPROACHES, A PATTERN CHANGE IS EXPECTED. MODELS  
HAVE THE CALIFORNIA LOW STARTING TO TREK EASTWARD RUNNING JUST  
SOUTH OF THE OR/CA BORDER AS IT PUSHES TOWARDS EASTERN  
OREGON/IDAHO. AS THIS LOW MOVES EASTWARD, THE RIDGE ALSO WILL  
GET PUSHED EASTWARD AND A UPPER LEVEL TROUGH STARTS TO DIVE DOWN  
FROM THE EASTERN PACIFIC. THIS WILL BRING MUCH COOLER AND  
MOISTER CONDITIONS. DAYTIME HIGHS ON WEDNESDAY ARE EXPECTED TO  
BE IN THE UPPER 70S TO LOW 80S INLAND, UPPER 50S TO MID 60S  
ALONG THE COAST AND UPPER 60S TO MID 70S IN THE CASCADES.  
THIS TROUGH ALSO BRINGS AROUND A 20-40% CHANCE OF LIGHT SHOWERS  
TO SOUTHWEST WASHINGTON WITH MOST OF NORTHWEST OREGON EVADING  
THE RAIN. /42  
   
LONG TERM...THURSDAY THROUGH SUNDAY  
AS THE LATTER PART OF THE  
WEEK AND WEEKEND APPROACHES, MODELS ARE STARTING TO COME INTO  
AGREEMENT THAT A WARMING AND DRYING TREND IS EXPECTED TO  
RETURN. NOW, WHILE THE EXACT PATTERN IS STILL IN FLUX, THE  
RESULTS WILL BE FAIRLY SIMILAR. EXPECT A GRADUAL WARM UP  
STARTING THURSDAY WITH FRIDAY LOOKING TO BE THE WARMEST IN THIS  
FOUR DAY STRETCH AND SATURDAY AND SUNDAY LOOKING VERY SIMILAR.  
OVERALL, NO PRECIPITATION IS EXPECTED THROUGH THE LONG TERM  
PERIOD, BUT DAYTIME HIGHS WILL SLOWLY WARM UP THROUGH THE LATTER  
PART OF THE WEEK AND INTO THE WEEKEND. /42  
 
 
   
AVIATION  
HIGH PRESSURE WILL MAINTAIN MOSTLY CLEAR SKIES WITH  
VFR CONDITIONS INLAND THROUGH TUESDAY. SHALLOW MARINE STRATUS  
ALONG THE COAST HAS ALREADY MOVED BACK INTO KONP WITH LIFR CIGS  
AND FOG, WHERE CONDITIONS ARE EXPECTED TO PERSIST THROUGH 18Z  
TUE. IFR TO LIFR STRATUS ALSO LIKELY TO PUSH BACK ONSHORE AT KAST  
WITH CONDITIONS QUICKLY DETERIORATING AFTER 06Z TUE. CONVECTIVE  
DEBRIS WILL BE POSSIBLE ACROSS SOUTHERN PORTIONS OF THE FORECAST  
AREA FROM ONGOING THUNDERSTORMS THIS EVENING ACROSS SW OREGON NEAR  
KMFR. ONSHORE, NORTHWEST WINDS INCREASE AGAIN TUE AFTERNOON, BUT  
NOT EXPECTED TO BE AS STRONG.  
 
PDX AND APPROACHES...VFR UNDER MOSTLY CLEAR SKIES. BREEZY  
NORTHWEST WINDS EXPECTED TO DIMINISH TO AROUND 05KT BY 07Z TUE.  
/DH  
 
 
   
MARINE  
VERY LITTLE CHANGE TO THE FORECAST WITH TODAY'S UPDATE.  
A TYPICAL SUMMERTIME PATTERN PERSISTS THROUGH MUCH OF THE COMING  
WEEK AS SURFACE HIGH PRESSURE OFFSHORE MAINTAINS NORTH TO  
NORTHWEST WINDS ACROSS THE COASTAL WATERS. RELATIVELY STRONG  
PRESSURE GRADIENT AT THE COAST DUE TO DIURNAL HEATING, AND  
ELEVATED WINDS REMAIN IN PLACE FOR ALL COASTAL WATERS THROUGH  
MONDAY NIGHT. SMALL CRAFT ADVISORIES REMAIN IN EFFECT THROUGH  
MONDAY EVENING AS WIND GUSTS INCREASE A BIT MORE TO 25 TO 30 KT  
MONDAY. EXPECT THE STRONGEST GUSTS SOUTH OF CAPE FALCON, WHILE  
CONDITIONS WILL BE MORE MARGINAL TO THE NORTH ACROSS THE MOUTH OF  
THE COLUMBIA RIVER AND THE SOUTH WASHINGTON COASTAL WATERS. SEAS  
WILL REMAIN IN THE 4-6 FT RANGE, COMPRISED MAINLY OF SHORT PERIOD  
WIND-DRIVEN WAVES AND A MODEST, MID-PERIOD WESTERLY SWELL.  
-TK/JLIU  
 
 
   
PQR WATCHES/WARNINGS/ADVISORIES  
 
OR...NONE.  
WA...NONE.  
PZ...SMALL CRAFT ADVISORY UNTIL 10 PM PDT THIS EVENING FOR PZZ251>253-  
271>273.  
 
 
 
 
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