361
FXUS66 KSEW 110332
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
832 PM PDT TUE JUN 10 2025
UPDATE
NO CHANGES MADE TO THE INHERITED FORECAST FOR THIS
EVENING'S UPDATE. ONSHORE FLOW WILL INCREASE TONIGHT AS MARINE
STRATUS DEVELOPS ALONG THE COAST TOWARDS PUGET SOUND OVERNIGHT
INTO WEDNESDAY MORNING. LOWS TONIGHT WILL RANGE BETWEEN THE UPPER
40S TO MID 50S. THE PREVIOUS DISCUSSION IS BELOW ALONG WITH AN
UPDATED AVIATION SECTION:
SYNOPSIS
A WEAK UPPER TROUGH WILL APPROACH WESTERN WASHINGTON
ON WEDNESDAY THEN SETTLE OVER THE AREA INTO EARLY NEXT WEEK. THIS
WILL LEAD TO COOLER TEMPERATURES, INCREASED CLOUD COVER, AND
OCCASIONAL CHANCES FOR MOUNTAIN SHOWERS AND COASTAL DRIZZLE.
SHORT TERM /TONIGHT THROUGH FRIDAY/
THE AIR MASS OVER WESTERN
WA IS A LITTLE COOLER TODAY AS THE RIDGE OVERHEAD FLATTENS. HIGHS
SO FAR ARE MOSTLY IN THE 70S TO LOWER 80S. ONSHORE FLOW IS
KEEPING THE COAST COOLER AND IN THE 60S.
WEAK TROUGHING DEVELOPS OVER THE REGION ON WEDNESDAY WHILE A
DEEP LOW SETS UP OVER THE GULF OF AK. ACROSS WESTERN WA, ONSHORE
FLOW WILL BRING STRATUS CLOUDS FARTHER INLAND AND INTO PORTIONS OF
THE INTERIOR DURING THE EARLY MORNING. THERE'S A SLIGHT CHANCE OF
SHOWERS IN THE NORTH CASCADES, NEAR THE CREST, WEDNESDAY
AFTERNOON. OTHERWISE, THE REST OF THE AREA WILL BE DRY.
THE TROUGH IS A LITTLE DEEPER OVER WA ON THURSDAY AS THE PARENT
LOW OFF SE ALASKA DRIFTS SOUTH. ONSHORE FLOW WILL BE STRONGER FOR
OVERALL CLOUDIER AND COOLER CONDITIONS ACROSS THE BOARD, WITH A
FEW SHOWERS EXPECTED. HIGHS ON THURSDAY ARE IN THE 60S TO LOWER
70S. THE COAST MAY SEE SOME MORNING LIGHT RAIN OR DRIZZLE WITH
AFTERNOON SHOWERS MAINLY IN THE OLYMPICS AND NORTH CASCADES.
EXPECT SIMILAR CONDITIONS ON FRIDAY AS LOW CONTINUES TO SPIN
OFFSHORE. 33
LONG TERM /SATURDAY THROUGH TUESDAY/
ONSHORE FLOW CONTINUES
THROUGH THE WEEKEND WHILE AN UPPER LEVEL LOW STALLS AND SPINS
OFFSHORE. TEMPERATURES WILL TRACK CLOSE TO AVERAGE WITH HIGHS IN
60S TO LOWER 70S. THERE'S A CHANCE OF SHOWERS SUNDAY NIGHT AND
MONDAY AS THE LOW SHIFTS EAST AND INLAND. TROUGHING OVER THE
REGION KEEPS SHOWERS IN THE FORECAST MOVING TOWARD MIDWEEK. 33
AVIATION
SOUTHWESTERLY FLOW ALOFT ACROSS THIS REGION TONIGHT AHEAD
OF A WEAK UPPER TROUGH APPROACHING THE AREA. THIS IS MAINTAINING
LIGHT ONSHORE FLOW THAT WILL INCREASE A BIT THROUGH THE EVENING.
SATELLITE IMAGERY SHOWING STRATUS ALREADY MOVING INLAND ALONG THE
COAST TONIGHT, WITH GENERALLY CLEAR SKIES ACROSS THE INTERIOR OUTSIDE
OF A FEW BANDS OF PASSING HIGH CLOUDS. SLIGHTLY STRONGER ONSHORE
FLOW WEDNESDAY MORNING WILL BRING A PUSH OF MARINE STRATUS INTO
PORTIONS OF CENTRAL PUGET SOUND FOR A FEW HOURS BETWEEN 12Z-18Z.
OUTSIDE OF THE STRATUS, GENERALLY CLEAR SKIES WILL CONTINUE.
KSEA...VFR UNDER CLEAR SKIES TONIGHT. W/NW SURFACE WINDS
PERSISTING THIS EVENING AT AROUND 6 KT. WINDS WILL THEN SHIFT TO
THE SW AFTER 06Z TONIGHT. A PUSH OF LOW STRATUS WILL LIKELY
BRINGS A FEW HOURS OF IFR CONDITIONS ARRIVING AFTER/AROUND 12Z,
WITH CLEARING EXPECTED TOWARD 16Z.
MARINE
HIGH PRESSURE REMAINS OFFSHORE THROUGH MUCH OF THE
WEEK, BUILDING EASTWARD INTO THE COASTAL WATERS LATE IN THE WEEK.
WILL CONTINUE THE SMALL CRAFT ADVISORY FOR THE COASTAL WATERS DUE TO
SEAS REMAINING GENERALLY 8 TO 12 FT OVER THE COASTAL WATERS (LARGEST
OVER THE OUTER COASTAL WATERS) WITH DOMINANT PERIODS REMAINING
AROUND 10 SECONDS. WITH THE PERSISTENT NORTHERLY WINDS, EXPECT SEAS
TO REMAIN ELEVATED AND CHOPPY OVER THE OUTER COASTAL WATERS THROUGH
MUCH OF THE WEEK. WINDS WILL ALSO REMAIN IN THE 20 TO 25 KT RANGE
BEYOND AROUND 30 NM FROM SHORE THROUGH THE NEXT FEW DAYS.
MEANWHILE, EXPECT DIURNAL WESTERLY PUSHES THROUGH STRAIT OF JUAN DE
FUCA EACH AFTERNOON AND EVENING THROUGH THE WEEK AHEAD. THE
STRONGEST OF THESE IS LIKELY TO BE WEDNESDAY EVENING, AND A GALE
WATCH REMAINS IN EFFECT FOR THE CENTRAL AND EASTERN STRAIT ZONES.
LATEST GUIDANCE CONTINUES TO SUGGEST AROUND A 50% CHANCE OF GALES IN
THESE ZONES.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...GALE WATCH FROM WEDNESDAY EVENING THROUGH LATE WEDNESDAY NIGHT
FOR CENTRAL U.S. WATERS STRAIT OF JUAN DE FUCA-EAST
ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA.
SMALL CRAFT ADVISORY UNTIL 5 AM PDT WEDNESDAY FOR COASTAL WATERS
FROM CAPE FLATTERY TO JAMES ISLAND OUT 10 NM-COASTAL WATERS
FROM JAMES ISLAND TO POINT GRENVILLE OUT 10 NM-COASTAL
WATERS FROM POINT GRENVILLE TO CAPE SHOALWATER OUT 10 NM.
SMALL CRAFT ADVISORY UNTIL 6 PM PDT WEDNESDAY FOR COASTAL WATERS
FROM CAPE FLATTERY TO JAMES ISLAND 10 TO 60 NM-COASTAL
WATERS FROM JAMES ISLAND TO POINT GRENVILLE 10 TO 60 NM-
COASTAL WATERS FROM POINT GRENVILLE TO CAPE SHOALWATER 10
TO 60 NM.
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