425
FXUS66 KSEW 102157
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
257 PM PDT FRI APR 10 2026
SYNOPSIS
WARM AND DRY CONDITIONS WILL CONTINUE TODAY. WET AND COOLER
CONDITIONS EXPECTED THIS 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. EVEN COOLER
TEMPERATURES FOLLOW BEHIND THE SYSTEM BEFORE SLOWLY WARMING BACK
UP TO THE END OF THE WEEK.
SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/
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 THROUGHOUT THE TAF PERIOD. AN UPPER LOW OFF THE
US WEST COAST IS PUSHING MID-HIGH LEVEL CLOUD COVERAGE ACROSS
WESTERN WASHINGTON THIS AFTERNOON. WITH IT, CONDITIONS HAVE BEEN VFR
SO FAR TODAY AND WILL REMAIN INTO THE EVENING FOR MOST. HOWEVER,
SHOWERS ARE FORECAST TO INCREASE OVERNIGHT INTO EARLY SATURDAY
MORNING AND WITH THEM - MVFR TO IFR (30-50% CHANCE FOR KPWT & KHQM)
CIGS ARE SLATED TO DEVELOP. THESE CIGS WILL LIFT AND SCATTER TOWARDS
21-00Z TOMORROW AFTERNOON-EARLY EVENING. LIGHT SURFACE WINDS UNDER 5
KT BEFORE INCREASING FROM THE SOUTH EARLY SATURDAY AND BECOMING
LIGHTER AGAIN DURING THE EVENING.
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 MORE S/SW LATE TONIGHT INTO
SATURDAY BETWEEN 5-10 KT.
DM
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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