036
FXUS66 KSEW 031018
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
318 AM PDT THU JUL 3 2025
SYNOPSIS
INCREASED ONSHORE FLOW WILL BRING SEASONAL CONDITIONS
TODAY. A WEAK TROUGH WILL MOVE INLAND ON FRIDAY FOLLOWED BY ZONAL
FLOW THROUGH THE WEEKEND WITH MOSTLY DRY WEATHER AND AVERAGE
TEMPERATURES. HIGH PRESSURE WILL BUILD INTO THE REGION, PROMOTING
WARMER CONDITIONS ACROSS WESTERN WASHINGTON.
SHORT TERM /TODAY THROUGH SATURDAY/
AN UPPER-LOW IS CURRENTLY
TRAVERSING ACROSS BC WHILE WEAK TROUGHING RESIDES OFFSHORE. HERE
LOCALLY WE'RE SOMEWHERE IN BETWEEN - IN A REGIME OF QUASI-ZONAL
FLOW ALOFT. CLOSER TO THE SURFACE, CONDITIONS ARE DRY BUT PARTLY
CLOUDY AS WEAK CONVERGENCE FILLS ACROSS THE PUGET SOUND REGION AND
MARINE STRATUS TRICKLES ALONG THE COAST AND INTO THE SW INTERIOR.
FOR TODAY, PLEASANT WEATHER IS IN STORE AS CLOUD COVERAGE
GRADUALLY DECREASE. HIGH TEMPERATURES WILL TOP OUT IN THE LOWER
TO MID 70S THROUGHOUT INTERIOR WHILE THE COAST REMAINS COOLER,
GENERALLY IN THE 60S. MARINE STRATUS AGAIN THURSDAY NIGHT, BUT NOT
AS EXPANSIVE. OVERNIGHT LOWS WILL INTO THE UPPER 40S TO LOWER
50S.
WEAK TROUGHING ALOFT POSITIONS OVERHEAD ON FRIDAY BEFORE EXITING
ON SATURDAY. GUIDANCE IS IN FIRM AGREEMENT WITH MOISTURE REMAINING
WELL EAST OF THE CWA. BUT, CAN'T RULE OUT A SLIGHT CHANCE (15%) OF
POPS OVER THE NORTH CASCADES ON FRIDAY EVENING. ZONAL FLOW ALOFT WILL
REPOSITION ON SATURDAY AS INCREASED ONSHORE FLOW INVITES MORE
CLOUD COVERAGE TO START THE DAY. SEASONAL TEMPERATURES ARE FAVORED
TO CONTINUE FOR BOTH FRIDAY AND SATURDAY WITH MOSTLY DRY
CONDITIONS PERSISTING AS WELL.
LONG TERM /SUNDAY THROUGH WEDNESDAY/
ZONAL FLOW IS FAVORED TO
INTO EARLY NEXT WEEK, RESULTING IN CONTINUED SEASONAL
TEMPERATURES AND PERIODS OF MORNING CLOUDS AND AFTERNOON SUNSHINE.
THEN, THE FOUR CORNERS HIGH WILL INCREASE IN STRENGTH, LEADING TO
RISING HEIGHTS OVER THE REGION TOWARDS MIDWEEK. HERE, WE COULD
SEE WARMER TEMPERATURES EVOLVE INTO THE FORECAST BUT NO
SIGNIFICANT THREAT OF HEATRISK IS EXPECTED AT THIS TIME.
MCMILLIAN
AVIATION
WEAK UPPER LEVEL TROUGH REMAINING OFFSHORE INTO FRIDAY
MORNING. WEST SOUTHWESTERLY FLOW ALOFT BECOMING SOUTHERLY THIS
EVENING. IN THE LOWER LEVEL ONSHORE FLOW CONTINUING THROUGH
FRIDAY.
STRATUS DECK FROM SKAGIT COUNTY TO NORTHERN PIERCE COUNTY WILL
DISSIPATE LATE THIS MORNING. CEILINGS MOSTLY LOW END VFR IN THE
STRATUS DECK WITH POCKETS OF MVFR. MVFR STRATUS DECK ALONG THE
COAST WILL DISSIPATE LATE MORNING/EARLY AFTERNOON. JUST SOME HIGH
CLOUDS ALL AREAS LATER THIS AFTERNOON INTO TONIGHT. MVFR STRATUS
DECK REFORMING ALONG THE COAST LATER THIS EVENING. STRATUS MOVING
INLAND FRIDAY MORNING BUT STAYING WEST OF PUGET SOUND.
KSEA...MVFR CEILINGS LIFTING TO VFR 16Z-18Z. STRATUS SCATTERING
OUT AROUND 19Z WITH JUST HIGH CLOUDS INTO FRIDAY MORNING.
SOUTHWEST WIND 4 TO 8 KNOTS BECOMING NORTHERLY 22Z-00Z. NORTHERLY
WINDS CONTINUING INTO FRIDAY MORNING. FELTON
MARINE
HIGH PRESSURE WILL REMAIN IN PLACE ACROSS THE COASTAL AND
OFFSHORE WATERS THIS WEEK WITH THERMALLY INDUCED LOW PRESSURE EAST
OF THE CASCADES. A WEAK FRONT WILL DISSIPATE OVER THE OFFSHORE
WATERS SATURDAY.
DIURNAL WESTERLY PUSHES THROUGH THE STRAIT OF JUAN DE FUCA EACH
EVENING THROUGH THE WEEKEND. FRIDAY EVENING LOOKS TO BE THE
STRONGEST PUSH WITH ANOTHER ROUND OF SMALL CRAFT ADVISORY WINDS
LIKELY FOR THE CENTRAL AND EASTERN STRAIT. FELTON
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...SMALL CRAFT ADVISORY 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.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page