722
FXUS66 KSEW 051632
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
932 AM PDT SAT JUL 5 2025
SYNOPSIS
SEASONAL TEMPERATURES CONTINUE TODAY BUT A WARMING
TREND WILL FOLLOW INTO EARLY NEXT WEEK AS AN UPPER RIDGE
STRENGTHENS OVER WESTERN WASHINGTON. THE RIDGE WILL WEAKEN AND
ONSHORE FLOW WILL INCREASE FOR A COOLING TREND IN THE SECOND HALF
OF NEXT WEEK.
SHORT TERM /TODAY THROUGH MONDAY/
NO UPDATES PLANNED TO THE
FORECAST THIS MORNING. MORNING CLOUDS WILL CLEAR AWAY THEN ONE MORE
SEASONABLY MILD DAY BEFORE TEMPERATURES RISE THROUGH THE EARLY PART
OF THE COMING WEEK. PREVIOUS DISCUSSION FOLLOWS WITH UPDATE TO
AVIATION PORTION.
AN UPPER TROUGH IS PUSHING EAST OF W WA, POSITIONING ITSELF OVER THE
INLAND NORTHWEST THIS MORNING. IN ITS WAKE, INCREASED ONSHORE FLOW
IS INTRODUCING MORE CLOUD COVERAGE TO START THE DAY. STRATUS WILL
GRADUALLY BURN OFF INTO THE AFTERNOON, BUT SOME HIGH CLOUDS MAY
CONTINUE TO DRAPE THE SKY. HIGHS TODAY VERY SIMILAR TO THE DAY
PRIOR, WITH TEMPERATURES FORECAST TO TOP OUT IN THE LOWER TO MID 70S
AND 60S ALONG THE COAST. OVERNIGHT LOWS WILL BOTTOM INTO THE MID 40S
TO LOWER 50S.
MODEST WARMING ON TAP FOR SUNDAY AS FLOW ALOFT BECOMES SOMEWHAT
ZONAL. TEMPERATURES WON'T STRAY TOO FAR FROM AVERAGE, REMAINING
GENERALLY IN THE MID TO UPPER 70S BUT LOCATIONS IN THE SW INTERIOR
AND CASCADE VALLEYS MAY TOP OUT AROUND 80 F. ON MONDAY, 80S WILL
BECOME MORE WIDESPREAD AS UPPER-LEVEL HEIGHTS RISE IN RESPONSE TO
STOUT RIDGING OVER THE SW. HIGH TEMPERATURES WILL GET BACK INTO
THE LOWER TO MID 80S FROM THE SEATTLE AREA SOUTHWARD.
LONG TERM /TUESDAY THROUGH FRIDAY/
THE WARM SPELL LOOKS TO
PEAK ON TUESDAY. MODELS HAVE UPPER-RIDGING BECOMING A BIT MORE
PRONOUNCED AS LOWER TO MID 80S CONTINUE WITH UPPER 80S IN THE
CARDS FOR VALLEY LOCATIONS. MODERATE HEATRISK COULD BE OF CONCERN
ON TUESDAY. THE RIDGE WILL THEN FLATTEN ON WEDNESDAY AS A DEEP
TROUGH TRAVERSES ACROSS NORTHERN BC. ITS INFLUENCE WILL BE FELT
HERE AS FLOW ALOFT BECOMES MORE ZONAL WITH INCREASING ONSHORE
FLOW. MODELS ARE INDICATING SIMILAR CONDITIONS IN STORE THROUGH
FRIDAY. THE ONGOING THEME OF TYPICALLY DRY CONDITIONS FOR JULY
CONTINUES.
MCMILLIAN
AVIATION
WESTERLY FLOW ALOFT WILL CONTINUE THROUGH THE TAF
PERIOD AS AN UPPER TROUGH OVER THE REGION MOVES OFF TO THE EAST AND
ANOTHER APPROACHES THE COAST OF NORTHERN CALIFORNIA. ONSHORE FLOW
WILL CONTINUE IN THE LOW LEVELS. CONDITIONS ARE VFR ACROSS THE
MAJORITY OF THE AREA TERMINALS THIS MORNING, EXCEPT LOCALIZED MVFR
IN STRATUS ALONG THE COAST AND SOUTH SOUND. STRATUS WILL SCATTER BY
18Z FOR A RETURN TO MORE WIDESPREAD VFR CONDITIONS, BUT HIGH CLOUDS
WILL CONTINUE TO STREAM ACROSS THE AREA THROUGHOUT THE DAY.
WESTERLY WINDS WILL INCREASE ACROSS KCLM AND THROUGH WHIDBEY ISLAND
AGAIN LATE THIS AFTERNOON INTO THIS EVENING, WHILE WINDS ACROSS THE
CENTRAL AND SOUTH SOUND, PERSISTING AT 4-8 KT TODAY, ARE EXPECTED TO
TRANSITION FROM SOUTHWESTERLY TO NORTHERLY BY THIS EVENING.
KSEA...A MIX BETWEEN MVFR/VFR WITH HIGH CLOUDS STREAMING OVERHEAD.
ANY LINGERING STRATUS AT THE TERMINAL WILL SCATTER BY 18Z FOR A
RETURN TO VFR CONDITIONS THROUGH THE REMAINDER OF THE EVENING.
SOUTHWESTERLY SURFACE WINDS WILL PERSIST AT 4-8 KT TODAY BEFORE
SHIFTING TO THE NORTHWEST LATE THIS AFTERNOON AND INTO THIS EVENING
AND INCREASING TO 8-12 KTS.
14/MAZURKIEWICZ
MARINE
HIGH PRESSURE WILL REMAIN OVER THE COASTAL WATERS
THROUGH THE WEEKEND AND STRENGTHEN INTO EARLY NEXT WEEK. MEANWHILE,
DIURNAL WESTERLY PUSHES WILL CONTINUE OVER THE NEXT SEVERAL
EVENINGS. WINDS TONIGHT HAVE ALREADY STARTED TO EASE ACROSS THE
CENTRAL AND EASTERN STRAIT AND WILL CONTINUE TO DO SO THROUGH THE
EARLY MORNING HOURS. THE NEXT PUSH TONIGHT WILL NOT BE AS STRONG,
HOWEVER EXPECT WINDS TO REACH SMALL CRAFT ADVISORY STRENGTH. A
WEAK FRONT MAY APPROACH THE AREA WATERS AROUND MIDWEEK.
SEAS OVER THE COASTAL WATERS WILL GENERALLY HOVER BETWEEN 3-6 FT
OVER THE NEXT SEVERAL DAYS, THOUGH LOOK TO BECOME STEEP AT TIMES
WITH PERSISTENT NORTHERLY WINDS OVER THE COASTAL WATERS.
14
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...GALE WARNING UNTIL 5 AM PDT EARLY THIS MORNING FOR CENTRAL U.S.
WATERS STRAIT OF JUAN DE FUCA-EAST ENTRANCE U.S. WATERS
STRAIT OF JUAN DE FUCA.
SMALL CRAFT ADVISORY FROM 2 PM THIS AFTERNOON TO 3 AM PDT SUNDAY
FOR CENTRAL U.S. WATERS STRAIT OF JUAN DE FUCA-EAST
ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA.
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