729
FXUS66 KSEW 060352
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
852 PM PDT SAT SEP 5 2026
SYNOPSIS
LOW PRESSURE WILL BRING SHOWERS AND THUNDERSTORMS
TO PORTIONS OF WESTERN WASHINGTON THROUGH SUNDAY, WITH WARMER
AND DRIER CONDITIONS RETURNING EARLY NEXT WEEK. OFFSHORE FLOW
WILL LEAD TO SLIGHTLY WARMER WEATHER MIDWEEK. THE NEXT
DISTURBANCE WILL BRING A RETURN OF COOLER CONDITIONS AND SHOWER
CHANCES LATER NEXT WEEK.
SHORT TERM /TONIGHT THROUGH MONDAY NIGHT/
ISOLATED SHOWERS
CONTINUE TO WEAKEN THIS EVENING, WITH A FEW LINGERING SHOWERS
TONIGHT. THE UPPER LOW CONTINUES TO MOVE OVER THE REGION BUT
BEGINS TO FINALLY SLIDE AWAY ON SUNDAY. WITH GENERALLY LIGHT
FLOW ALOFT, THIS SHOULD KEEP SHOWERS MORE CONFINED TO THE
MOUNTAINS. THE CHANCES WILL REMAIN HIGHEST OVER THE CASCADES
SOUTH OF I-90, AND THERE COULD BE LOCALLY HIGHER RAINFALL
AMOUNTS WITH THE SLOWER MOVING STORMS.
EXPECT SHOWERS TO BE MOSTLY LIMITED AND GENERALLY DRY CONDITIONS
MONDAY FOR MUCH OF THE AREA WITH THE UPPER LOW FINALLY PUSHING
WELL INLAND AND AWAY FROM THE REGION. ONSHORE FLOW INCREASES AT
THE LOW-LEVEL, BRINGING A STEADY PUSH OF MARINE CLOUDS FOR THE
MORNING BEFORE SOME CLEARING IN THE LATE AFTERNOON.
LONG TERM /TUESDAY THROUGH SATURDAY/
EXPECT A SHIFT TO
WARMER AND DRIER CONDITIONS TOWARD MIDWEEK WITH THE REGION
REMAINING IN BETWEEN ANY SIGNIFICANT WEATHER DISTURBANCES.
LIGHT OFFSHORE FLOW IN THE LOWER LEVELS WILL BRING A SLIGHT
WARMING BACK INTO THE MID TO UPPER 70S FOR MID- WEEK,
CORRESPONDING TO MINOR (YELLOW) HEATRISK VALUES. ANOTHER
DISTURBANCE ARRIVES LATER IN THE WITH A RETURN OF COOLER
TEMPERATURES AND RAIN CHANCES.
AVIATION
VFR FOR ALL TERMINALS THIS EVENING WITH PATCHY MIDDLE
AND HIGH CLOUDS OVERHEAD FROM WHAT'S LEFT OF THIS AFTERNOONS
CONVECTION. FLOW IS LIGHT AND PRIMARILY OUT OF THE NNW. VFR
CONDITIONS WILL REMAIN OVERNIGHT, THE EXCEPTION BEING HQM, WHERE
BRIEF LOW CLOUDS MAY DEVELOP SUNDAY MORNING (09Z-14Z) WITH MVFR/IFR
CONDITIONS. KOLM MAY SEE BRIEF VIS REDUCTIONS AND MIST TOMORROW
MORNING (12Z-14Z). ELSEWHERE, VFR CONTINUING INTO SUNDAY.
KSEA...VFR WITH LIGHT NORTHERLY TO NORTHEASTERLY FLOW AT THE
TERMINAL THIS EVENING, WITH SIMILAR CONDITIONS EXPECTED OVERNIGHT.
SCT TO BKN CLOUDS ALOFT EXPECTED. VFR CONDITIONS CONTINUE INTO
SUNDAY, WITH FLOW BECOMING MORE NORTHERLY AROUND 17Z AND WESTERLY
AFTER 00Z.
21
MARINE
MARINE SEAS AND WINDS ARE BENIGN AND REMAINING UNDER
ANY ADVISORY CRITERIA. NORTHERLY WINDS WILL CONTINUE OVER MOST
OF THE AREA WATERS THROUGH THE REST OF THIS WEEKEND AND INTO
EARLY NEXT WEEK. ONSHORE FLOW LOOKS TO INCREASE LATE SUNDAY INTO
MONDAY, WHICH COULD BRING A PUSH OF WESTERLIES DOWN THE STRAIT
OF JUAN DE FUCA FOR POTENTIAL HEADLINES.
COASTAL SEAS REMAINING GENERALLY AROUND 3 TO 6 FEET THROUGH THE REST
OF THE WEEKEND, WITH SOME LOCATIONS IN THE OUTER COASTAL WATERS
INCREASING TO 6 TO 7 FEET ON MONDAY. SEAS WILL LEVEL BACK DOWN TO 3
TO 5 FEET THROUGH MIDWEEK.
MAZURKIEWICZ/21
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...NONE.
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