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.
WWW.WEATHER.GOV/PORTLAND
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