224  
FXUS66 KPQR 291612  
AFDPQR  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PORTLAND OR  
912 AM PDT SUN JUN 29 2025  
   
UPDATED AVIATION DISCUSSION  
 
 
   
SYNOPSIS  
 
WARM AND DRY WEATHER WILL PERSIST THROUGH THE REMAINDER OF THE  
WEEKEND, WITH TEMPERATURES CONTINUING TO RISE INTO EARLY NEXT  
WEEK. THE HOTTEST DAY IS EXPECTED TO BE MONDAY, WITH WIDESPREAD  
HIGHS IN THE LOW TO MID 90S ACROSS INTERIOR VALLEYS. SLIGHT  
COOLING FOLLOWS MIDWEEK, BUT TEMPERATURES WILL REMAIN ABOVE  
SEASONAL NORMS. THERE IS ALSO A LOW-END POTENTIAL FOR ISOLATED  
THUNDERSTORMS OVER THE CENTRAL OREGON CASCADES MONDAY AND  
TUESDAY.  
 
 
   
SHORT TERM...NOW THROUGH MONDAY  
THE REGION REMAINS UNDER THE  
INFLUENCE OF DRY AND WARMING CONDITIONS THIS MORNING, WITH  
TEMPERATURES ON TRACK TO CLIMB FURTHER THROUGH MONDAY. A BROAD  
ZONAL FLOW PATTERN ACROSS THE PACIFIC NORTHWEST IS EVOLVING INTO  
A MORE AMPLIFIED REGIME AS A RIDGE OF HIGH PRESSURE - ROOTED  
OVER THE DESERT SOUTHWEST - BUILDS NORTHWARD ALONG ITS WESTERN  
EDGE. THIS WILL REINFORCE WARMING ACROSS THE AREA, PARTICULARLY  
FOR INLAND VALLEYS.  
 
HIGH TEMPERATURES TODAY WILL REACH THE UPPER 80S TO NEAR 90  
ACROSS THE INTERIOR LOWLANDS. MEANWHILE, COOLER MARINE INFLUENCE  
AND PERSISTENT ONSHORE FLOW WILL KEEP COASTAL ZONES AND HIGHER  
ELEVATIONS IN THE UPPER 60S TO MID 70S, OFFERING MORE  
COMFORTABLE CONDITIONS.  
 
MONDAY WILL LIKELY BE THE HOTTEST DAY OF THE PERIOD. INLAND  
VALLEYS ARE FORECAST TO SEE HIGHS IN THE LOW TO MID 90S, WITH  
LOCALIZED DOWNSLOPE EASTERLY FLOW ENHANCING WARMTH ON THE  
WESTERN SLOPES OF THE CASCADES. HOWEVER, THIS DOWNSLOPE  
INFLUENCE SHOULD REMAIN SHALLOW AND NOT SIGNIFICANTLY IMPACT  
COASTAL TEMPERATURES, WHICH ARE EXPECTED TO HOLD IN THE LOW TO  
MID 70S. CURRENT PROBABILISTIC GUIDANCE INDICATES A 40-70%  
CHANCE FOR TEMPERATURES EXCEEDING 95 DEGREES IN THE WILLAMETTE  
VALLEY, PARTICULARLY SOUTH OF PORTLAND. SIMILARLY, THERE IS  
ABOUT A 50-70% CHANCE THAT THE UPPER HOOD RIVER VALLEY WILL ALSO  
REACH 95 DEGREES ON MONDAY. ALTHOUGH THIS HEAT EVENT IS BRIEF  
AND DOES NOT CURRENTLY MEET CRITERIA FOR EXCESSIVE HEAT  
HEADLINES, SENSITIVE POPULATIONS - ESPECIALLY THOSE WITHOUT  
ACCESS TO COOLING - MAY EXPERIENCE DISCOMFORT.  
 
THERE IS ALSO A SLIGHT CHANCE (15-25%) OF ISOLATED  
THUNDERSTORMS MONDAY AFTERNOON AND EVENING ACROSS THE OREGON  
CASCADES, MAINLY FROM LANE COUNTY SOUTHWARD. A WEAK DISTURBANCE  
OFF THE NORTHERN CALIFORNIA COAST IS HELPING TO ADVECT MID-LEVEL  
MOISTURE INTO THE REGION. COMBINED WITH MODEST INSTABILITY -  
MOST NOTABLE OVER THE CENTRAL OREGON CASCADES - THIS MAY BE  
SUFFICIENT FOR THUNDERSTORM INITIATION OVER HIGHER TERRAIN.  
SHOULD MOISTURE TRENDS SHIFT NORTHWARD, ISOLATED STORM ACTIVITY  
COULD APPROACH AREAS CLOSER TO MOUNT HOOD, THOUGH CONFIDENCE  
REMAINS RATHER LOW AT THIS TIME. -HALL  
 
   
LONG TERM...TUESDAY THROUGH SATURDAY  
A SIMILAR PATTERN HOLDS FOR  
TUESDAY, THOUGH STORM COVERAGE AND ORGANIZATION APPEAR TO  
DIMINISH SOMEWHAT. WITH SOUTHWESTERLY UPPER LEVEL FLOW EXPECTED,  
CONFIDENCE FOR THUNDERSTORM DEVELOPMENT IS MUCH LOWER AS THE  
FLOW WILL LIKELY KEEP THUNDERSTORMS TO THE EAST OF THE CASCADES.  
 
TEMPERATURES WILL MODERATE SLIGHTLY BEGINNING TUESDAY, THOUGH  
STILL REMAINING ABOVE NORMAL. HIGHS THROUGH MIDWEEK SHOULD  
SETTLE INTO THE LOW TO MID 80S ACROSS THE WILLAMETTE VALLEY,  
WITH OVERNIGHT LOWS GENERALLY IN THE 50S. ENSEMBLE GUIDANCE  
CONTINUES TO SUPPORT A WARM AND DRY PATTERN THROUGH AT LEAST  
SATURDAY, WITH LITTLE SIGNAL FOR SIGNIFICANT COOLING DURING  
THAT TIME FRAME. -HALL  
 
 
   
AVIATION  
VFR THROUGH THE NEXT 24 HOURS. LIGHT NORTHWESTERLY  
FLOW AROUND KONP IS PUSHING MIST INTO THE TERMINAL CAUSING  
VISIBILITY TO DECREASE. ONCE WINDS RISE ABOVE 5 KT THOUGH THAT  
WILL IMPROVE. HIGH PRESSURE WILL CAUSE WINDS TO INCREASE FROM THE  
NORTH. COASTAL TERMINALS WILL SEE THE BULK OF THE WIND WITH GUSTS  
UP TO 30 KT POSSIBLE AROUND KONP. ELSEWHERE IN N-S ALIGNED  
TERRAIN, EXPECT GUSTS UP TO 25 KT.  
 
PDX AND APPROACHES...VFR WITH NORTHERLY WINDS. FOR APPROACHES,  
GUSTS UP TO 25 KT FROM 1500-3000 FT AGL AFTER 02Z MON.  
-MUESSLE  
 
 
   
MARINE  
 
HIGH PRESSURE OVER THE PACIFIC WILL MAINTAIN NORTHERLY  
WINDS ACROSS ALL WATERS THROUGH THE WEEK. TODAY, WINDS WILL  
GRADUALLY STRENGTHEN FROM SOUTH TO NORTH AS PRESSURE GRADIENTS  
TIGHTEN. EXPECT NORTHERLY WINDS AROUND 15-20 KT WITH GUSTS TO  
UP TO 30 KT, THROUGH AT LEAST EARLY MONDAY MORNING. BREEZY  
NORTHERLY WINDS ARE EXPECTED TO PERSIST GIVEN THE OVERALL PATTERN  
IS NOT EXPECTED TO CHANGE MUCH. THEREFORE, HAVE EXTENDED THE  
CURRENT SUITE OF SMALL CRAFT ADVISORIES THROUGH AT LEAST MONDAY  
MORNING.  
 
SEAS 5 TO 8 FT AT 9 TO 10 SECONDS THROUGH TUESDAY. GIVEN THAT  
SEAS WILL MAINLY BE WIND-DRIVEN, COMBINING THAT WITH WESTERLY  
SWELLS, EXPECT CONDITIONS TO BE STEEP AND CHOPPY AT TIMES. OVERALL  
CONDITIONS EXPECTED TO SLOWLY SUBSIDE THROUGH THE MIDDLE OF THE  
WEEK AS THE AFOREMENTIONED HIGH PRESSURE IS PUSHED EASTWARD. -42  
 
 
   
PQR WATCHES/WARNINGS/ADVISORIES  
 
OR...NONE.  
WA...NONE.  
PZ...SMALL CRAFT ADVISORY FROM 2 PM THIS AFTERNOON TO 11 AM PDT  
MONDAY FOR PZZ210.  
SMALL CRAFT ADVISORY UNTIL 11 AM PDT MONDAY FOR PZZ251>253-  
271>273.  
 
 
 
 
WWW.WEATHER.GOV/PORTLAND  
 
INTERACT WITH US VIA SOCIAL MEDIA:  
WWW.FACEBOOK.COM/NWSPORTLAND  
X.COM/NWSPORTLAND  
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