928
FXUS66 KSEW 101753
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
1053 AM PDT TUE JUN 10 2025
SYNOPSIS
A WEAKENING UPPER LEVEL RIDGE OVER THE REGION AND
INCREASING ONSHORE FLOW WILL PRODUCE COOLER TEMPERATURES ACROSS
THE AREA TODAY. 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 /TODAY THROUGH THURSDAY/
THE CURRENT FORECAST
REMAINS ON TRACK TODAY. 33
PREVIOUS FORECAST...ONSHORE FLOW CONTINUES TO INCREASE AS
THERMALLY INDUCED LOW PRESSURE SHIFTS EAST OF THE CASCADES AND
UPPER RIDGING OVERHEAD WEAKENS. THE HQM/SEA GRADIENT IS OVER 2
MILLIBARS EARLY THIS MORNING WITH MARINE AIR FLOODING INLAND AS
NOTED BY SOME GUSTY WINDS AT SHELTON EARLIER WITH STRATUS
SPREADING INLAND THROUGH THE CHEHALIS GAP. HIGH TEMPERATURES
ACROSS MUCH OF THE INTERIOR WILL BE SOME 10 DEGREES OR MORE COOLER
OVER YESTERDAYS HIGH TEMPS WHILE COASTAL AREAS MAY STRUGGLE TO
GET NORTH OF 60 F. THE COOLING CONTINUES INTO WEDNESDAY AS LOW
LEVEL ONSHORE FLOW INCREASES YET FURTHER AHEAD OF A WEAK UPPER
TROUGH. SOME STRATUS WILL LIKELY MAKE IT INTO THE INTERIOR
LOWLANDS ON WEDNESDAY MORNING AND HIGH TEMPERATURES WILL DROP
SEVERAL MORE DEGREES WITH HIGHS AROUND PUGET SOUND MOSTLY WITHIN A
COUPLE DEGREES EITHER SIDE OF 70. A WEAK UPPER TROUGH AXIS WILL
SWING ONSHORE DURING THE DAY ON THURSDAY. AT THIS TIME, IT STILL
APPEARS TO REMAIN MOSTLY DRY. THOUGH IT WILL LIKELY PRODUCE MOSTLY
CLOUDY SKIES, SLIGHTLY BELOW NORMAL TEMPERATURES, AND A COUPLE OF
MOUNTAIN SHOWERS AND/OR COASTAL DRIZZLE.
LONG TERM /FRIDAY THROUGH MONDAY/
A MEAN UPPER TROUGH POSITION
REMAINS JUST OFFSHORE FRIDAY INTO EARLY NEXT WEEK WITH A SERIES OF
WEAK DISTURBANCES ROTATING ONSHORE. THIS WILL PRODUCE LITTLE IN
THE WAY OF IMPACTS FOR THE AREA WITH TEMPERATURES TRENDING A
LITTLE BELOW NORMAL. SOME OF THE EURO ENSEMBLES TRY TO BRING A
MORE SIGNIFICANT TROUGH ONSHORE JUST BEYOND THE 7 DAY PERIOD, BUT
THIS IS NOTABLY ABSENT FROM MUCH OF THE GFS ENSEMBLES WHICH LENDS
A FAIRLY HIGH DEGREE OF UNCERTAINTY TO THE FORECAST MUCH OF NEXT
WEEK. 27
AVIATION
SOUTHWESTERLY FLOW ALOFT ACROSS THIS REGION THIS
MORNING AHEAD OF A WEAK UPPER TROUGH APPROACHING THE AREAS.
THIS IS MAINTAINING LIGHT ONSHORE FLOW THAT WILL INCREASE A BIT
THROUGH THE DAY AND CONTINUING TONIGHT. A FEW LINGERING PATCHES OF
IFR STRATUS NEAR THE COASTLINE WILL CONTINUE TO CLEAR OUT, LEAVING
GENERALLY CLEAR SKIES TODAY WITH SOME PASSING HIGH CLOUDS. SLIGHTLY
STRONGER ONSHORE FLOW WEDNESDAY MORNING WILL PUSH THE STRATUS AS FAR
EAST AS THE CENTRAL SOUND FOR A FEW HOURS BETWEEN 12Z-18Z. OUTSIDE
OF THE STRATUS, GENERALLY CLEAR SKIES CONTINUE.
KSEA...VFR UNDER CLEAR SKIES THROUGH THE DAY TODAY. SOUTH
WINDS WILL VEER TO NORTHWEST THIS AFTERNOON, REACHING AROUND 6 KT
AFTER 22Z THROUGH AROUND 04Z. SOUTHWESTERLY WINDS RESUME BY 06Z
ONWARD, BUT PUSH OF LOW STRATUS LIKELY BRINGS A FEW HOURS OF IFR
CONDITIONS ARRIVING AFTER/AROUND 12Z.
MARINE
SURFACE HIGH PRESSURE OVER THE OFFSHORE WATERS WITH LOWER
PRESSURE INLAND THROUGH THE WEEK. HIGH PRESSURE WILL BUILD OVER
THE WATERS SATURDAY. NORTHWESTERLY FLOW WILL PERSIST OVER THE
COASTAL WATERS THE NEXT SEVERAL DAYS. DIURNAL WESTERLY PUSHES
ACROSS THE STRAIT EXPECTED IN THE EVENING HOURS THROUGH THE
PERIOD.
SMALL CRAFT ADVISORY NORTHWESTERLY WINDS OVER THE OUTER COASTAL
WATERS WITH SEAS 10 TO 13 FEET THROUGH AT LEAST FRIDAY. WINDS AND
SEAS SLOWLY SUBSIDING FRIDAY NIGHT INTO THE WEEKEND.
SMALL CRAFT ADVISORY TODAY FOR THE INNER COASTAL WATERS FOR 10
FOOT SEAS. SEAS SUBSIDING TONIGHT INTO WEDNESDAY.
GALE WATCH FOR THE CENTRAL AND EASTERN STRAIT OF JUAN DE FUCA FOR
WESTERLY WINDS POSSIBLY AS HIGH AS 35 KNOTS WEDNESDAY EVENING.
FELTON
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...SMALL CRAFT ADVISORY UNTIL 1 PM PDT THIS AFTERNOON FOR GRAYS
HARBOR BAR.
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 6 PM PDT THIS EVENING 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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