890
FXUS66 KSEW 110453
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
953 PM PDT FRI APR 10 2026
SYNOPSIS
DRY CONDITIONS THIS EVENING AND EARLY TONIGHT BEFORE WET AND COOLER
CONDITIONS MOVE IN FOR LATE TONIGHT AND INTO THE WEEKEND. A WEAK
RIDGE WILL BUILD OVER THE REGION ON MONDAY. A STRONGER FRONTAL
SYSTEM MIDWEEK WILL BRING LOWLAND RAIN, MOUNTAIN SNOW, AND BREEZY
WINDS. TEMPERATURES WILL COOL FURTHER IN THE WAKE OF THIS SYSTEM
BEFORE SLOWLY WARMING BACK UP FOR THE SECOND HALF OF NEXT WEEK.
SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/
LATEST RADAR TRENDS SHOWING THUNDERSTORM ACTIVITY DIMINISHING OVER
NORTHERN OR THIS EVENING. WHILE LATEST MODEL DATA HAS THESE CELLS
HOLDING TOGETHER AS THEY MOVE NORTHWARD INTO THE CWA, BY THAT POINT
ANY THUNDER RISK SHOULD BE PLAYED OUT. THAT SAID, THE MAJORITY OF W
WA FINDS ITSELF BETWEEN TWO BANKS OF CLOUDS, A NORTHERN BANK
STRETCHING FROM THE SNOHOMISH/SKAGIT COUNTY LINE AND THE OTHER
CREEPING UP FROM THE SOUTH, MAINLY ALONG THE CHEHALIS RIVER VALLEY
GETTING AS FAR NORTH AS OLYMPIA AT THE TIME OF THIS WRITING. SKIES
WILL FILL IN AS THE NIGHT PROGRESSES AS THIS BAND CONTINUES TO MOVE
NORTHWARD.
INHERITED FORECAST REMAINS ON TRACK, ALTHOUGH WILL CONTINUE TO
MONITOR DWINDLING ACTIVITY IN OR TO ENSURE THAT CURRENT TRENDS HOLD.
FOR ADDITIONAL FORECAST DETAILS, PLEASE REFER TO THE PREVIOUS
DISCUSSION SECTION BELOW. 18
FROM PREVIOUS DISCUSSION...HIGH CLOUDS PREVAIL OVER WESTERN
WASHINGTON TODAY AS WAVES MOVE UP NORTHWARD FROM A LARGE UPPER LEVEL
LOW OVER NORTHERN CALIFORNIA. WHILE TEMPERATURES WILL CONTINUE TO BE
WARM, THE CLOUDS WILL HELP TO LIMIT INSOLATION AND KEEP THE HIGH
TEMPERATURE DOWN FROM WHAT IT OTHERWISE COULD BE. SIMILAR CONDITIONS
TO YESTERDAY ARE EXPECTED, WITH HIGHS IN THE MID 60S TO NEAR 70,
EXCEPT CLOSER TO 60 ALONG THE IMMEDIATE COASTLINES.
SHOWERS WILL BEGIN TO MOVE IN FROM THE SOUTH TONIGHT INTO EARLY
SATURDAY. THERE MAY BE SOME SHOWERS AS EARLY AS THIS EVENING ACROSS
PORTIONS OF SOUTHWEST WASHINGTON, BUT THE BULK OF THE PRECIPITATION
IS NOT EXPECTED TO ARRIVE UNTIL EARLY SATURDAY MORNING. RAIN WILL
MOVE ACROSS THE AREA THROUGHOUT SATURDAY MORNING AND EARLY
AFTERNOON, DEVOLVING INTO MORE SCATTERED SHOWERS BY SATURDAY
EVENING. SCATTERED SHOWER CHANCES WILL CONTINUE INTO SUNDAY AS WELL
BUT MANY MAY BE MOSTLY DRY FOR MUCH OF THE DAY.
TEMPERATURES THIS WEEKEND WILL ALSO BE MUCH COOLER COMPARED TO
TODAY, WITH HIGHS RETURNING INTO THE MID TO UPPER 50S AND LOWS IN
THE 40S.
LONG TERM /MONDAY THROUGH FRIDAY/
A WEAK UPPER LEVEL RIDGE LOOKS TO DEVELOP ON MONDAY OVER BRITISH
COLUMBIA, CREATING SPLIT FLOW OVER THE AREA BEFORE A LARGE UPPER
LEVEL LOW DIGS INTO THE AREA TUESDAY INTO WEDNESDAY. THERE IS
STARTING TO BE MORE MODEL CONSENSUS IN THE ARRIVAL OF
PRECIPITATION TUESDAY NIGHT AND CONTINUING INTO WEDNESDAY. THIS
SYSTEM LOOKS TO BRING SOME DECENT MOISTURE, WITH THE POTENTIAL
FOR AN INCH OR TWO OF RAIN ACROSS THE MOUNTAINS, WITH SLIGHTLY
LESSER AMOUNTS ACROSS THE LOWLANDS. WITH SNOW LEVELS LOWERING TO
AROUND 3000 FT, THIS WILL ALLOW FOR SEVERAL INCHES OF
ACCUMULATING SNOW ACROSS THE MOUNTAINS, INCLUDING THE PASSES.
FINALLY, THIS SYSTEM ALSO LOOKS TO BRING WINDY CONDITIONS ACROSS
THE AREA, PARTICULARLY ON TUESDAY. DRIER CONDITIONS LOOK TO
PREVAIL THURSDAY AND BEYOND. TEMPERATURES WILL BE QUITE COOL,
WITH HIGHS IN THE UPPER 40S TO LOW 50S AND LOWS IN THE 30S.
WIDESPREAD FREEZING CONDITIONS MAY BE POSSIBLE IN THE MORNING
OUTSIDE OF URBAN AREAS BY THURSDAY MORNING. TEMPERATURES THEN
SLOWLY START TO WARM UP THROUGH THE END OF THE WEEK BUT REMAIN
BELOW NORMAL.
62
AVIATION
SOUTHERLY FLOW ALOFT ACROSS THE REGION WITH INCREASING SHOWERS
TONIGHT THROUGH EARLY SATURDAY. WITH THIS SYSTEM PUSHING NORTH,
WE'LL SEE LOWERING CEILINGS WITH WIDESPREAD MVFR AND LOCAL IFR
(HIGHEST CHANCES KPWT AND KHQM) TOWARD 12Z. EXPECT THE LOW
CEILINGS TO LIFT AND SCATTER TOWARDS 22Z SATURDAY. SOME
LINGERING SHOWERS CONTINUE THROUGH THE DAY. SOUTHERLY SURFACE
WINDS CONTINUE MOST TERMINALS AGAIN SATURDAY THROUGH THE DAY.
KSEA...VFR CONDITIONS THIS EVENING AND OVERNIGHT. CIGS ARE EXPECTED
TO LOWER INTO MVFR EARLY SATURDAY MORNING (13-15Z). SHOWERS WILL
ALSO BEGIN TO ARRIVE 12-14Z SATURDAY MORNING ALONG WITH THE LOWER
CEILINGS. LIGHT SURFACE WINDS BECOMING SOUTHERLY SATURDAY,
INCREASING AGAIN TO AROUND 6-8 KT.
MARINE
AN AREA OF LOW PRESSURE WILL SWING SOUTH OF AREA WATERS TONIGHT INTO
SATURDAY MORNING. NO IMPACTS ARE EXPECTED WITH THIS DISTURBANCE AS
IT TRACKS INTO NORTHERN CALIFORNIA AND WEAKEN. WESTERLY WINDS
THROUGH THE STRAIT WILL PICK UP DURING THIS TIME ALLOWING A BRIEF
SPELL IN THE POTENTIAL FOR SCA GUSTS BUT THE WINDOW IS SMALL ENOUGH
TO NOT WARRANT THE NEED FOR AN ADVISORY AT THIS TIME. THE PATTERN
WILL REMAIN ACTIVE INTO NEXT WEEK WITH A BETTER CHANCE FOR
HEADLINES. A STRONG FRONTAL SYSTEM LOOKS TO ARRIVE ON TUESDAY WITH
THE POTENTIAL FOR WIDESPREAD WIND RELATED HEADLINES AS SCAS LOOK TO
BE A SURE BET CURRENTLY. SEAS WILL REMAIN BELOW 10 FT THROUGH THE
WEEKEND AND INTO EARLY NEXT WEEK, HOVERING BETWEEN 4-7 FT. SEAS WILL
BUILD ON WEDNESDAY TOWARDS 9-10 FT.
DM
HYDROLOGY
NO RIVER FLOODING IS EXPECTED IN THE NEXT SEVEN DAYS.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...NONE.
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