339
FXUS66 KSEW 111011
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
211 AM PST TUE NOV 11 2025
SYNOPSIS
LARGELY DRY CONDITIONS ARE EXPECTED TODAY AS WEAK HIGH PRESSURE
BUILDS INTO THE AREA. THE NEXT SYSTEM IS OFFSHORE AND IS
EXPECTED TO ARRIVE IN THE AREA WEDNESDAY AFTERNOON INTO
THURSDAY. THE PATTERN LOOKS TO REMAIN ACTIVE THROUGH THE LATE
WEEK INTO THE WEEKEND, WITH ADDITIONAL SYSTEMS EXPECTED OVER THE
WEEKEND.
SHORT TERM /TODAY THROUGH THURSDAY/
SATELLITE IMAGERY EARLY THIS MORNING SHOWS WIDESPREAD LOW CLOUDS
THROUGHOUT WESTERN WASHINGTON. MOST OF THIS IS LIKELY STRATUS,
BUT SOME FOG DEVELOPMENT MAY STILL BE POSSIBLE IN AREAS SUCH AS
OLYMPIA AND AREAS SOUTH OF THAT. CLOUD DECKS ARE GENERALLY 2000
FEET OR LOWER AND WILL LIKELY LINGER THROUGH MUCH OF THE
MORNING. HIGH PRESSURE ALOFT WILL KEEP CONDITIONS DRY TODAY,
WITH HIGHS IN THE MID 50S.
ANOTHER SYSTEM WILL ARRIVE ONSHORE EARLY ON WEDNESDAY THROUGH
THURSDAY FOR A ROUND OF LIGHT RAIN AND SOME MOUNTAIN SNOW. WINDS
WILL BE LIGHTLY OFFSHORE ON WEDNESDAY, WITH BREEZY CONDITIONS AT
TIMES ALONG THE IMMEDIATE COAST. SNOW LEVELS WILL BE HIGHER,
6000-7000 FEET ON WEDNESDAY, BUT LOOK TO DECREASE THURSDAY
AFTERNOON TO AROUND 3800 FEET, WITH MIXED PRECIPITATION POSSIBLE
ALONG THE CASCADE PASSES AND HIGHER AREAS OF THE FOOTHILLS.
21
LONG TERM /THURSDAY NIGHT THROUGH MONDAY/
THERE IS STILL SOME UNCERTAINTY LATE IN THE WEEK ABOUT WHERE THE
CORE OF THE PARENT LOW PRESSURE SYSTEM WILL ARRIVE ONSHORE, BUT
THE SOLUTIONS SEEM TO BE CONVERGING SOMEWHERE ALONG THE OREGON
COAST. PRECIPITATION IS FORECAST TO CONTINUE INTO THURSDAY NIGHT
AND FRIDAY. NONE OF THESE SYSTEMS SEEM PARTICULARLY IMPRESSIVE
AS IT RELATES TO QPF, AS STORM TOTAL QPF FROM WEDNESDAY MORNING
THROUGH FRIDAY AFTERNOON DETAILS AROUND A HALF TO THREE QUARTERS
OF AN INCH OF RAIN THROUGHOUT PUGET SOUND, AND ONE TO TWO INCHES
OF RAIN IN THE OLYMPIC AND CASCADE MOUNTAINS. SNOW LEVELS COME
DOWN TO AROUND 3800 FEET THURSDAY NIGHT INTO FRIDAY MORNING FOR
SOME SNOW ACCUMULATION MORE LIKELY AT STEVENS PASS THAN
SNOQUALMIE PASS AT THIS POINT.
AN ADDITIONAL SYSTEM OVER THE WEEKEND MAY BE SLIGHTLY WETTER AND
BRING ANOTHER ROUND OF SNOW ACCUMULATION IN THE MOUNTAINS.
21
AVIATION
WEAK HIGH PRESSURE OVER THE REGION TODAY FOR DRY
WEATHER. THE FLOW ALOFT IS WESTERLY. LOTS OF LOW LEVEL MOISTURE
ACROSS WESTERN WA WITH IFR TO MVFR CONDITIONS THIS MORNING. VFR
CONDITIONS EXPECTED BY THE AFTERNOON. RAIN SPREADING INLAND
WEDNESDAY MORNING AS A TROUGH MOVES IN FROM THE WEST. 33
KSEA...MVFR CONDITIONS THIS MORNING WITH LIGHT WIND. VFR
CONDITIONS EXPECTED BY 21Z WITH N WINDS AROUND 5 KT. 33
MARINE
HIGH PRESSURE OVER THE AREA TODAY FOR GENERALLY LIGHT
WINDS. NEXT FRONTAL SYSTEM MOVING SLOWLY THROUGH THE WATERS
WEDNESDAY NIGHT AND THURSDAY WITH INCREASING SOUTHERLY WINDS
OVER THE WATERS. STRONG ONSHORE FLOW WILL FOLLOW THURSDAY
NIGHT. MEANWHILE, SEAS WILL ALSO BUILD TO AROUND 10 TO 13 FEET.
ADDITIONAL FRONTS WILL REACH THE AREA FRIDAY AND OVER THE
WEEKEND, KEEPING THE PATTERN ACTIVE. 33
HYDROLOGY
HIGH PRESSURE WILL BRING A BRIEF BREAK IN PRECIPITATION ON
TUESDAY BEFORE CHANCES FOR HEAVIER PRECIPITATION INCREASE
TOWARDS THE END OF THE WEEK. WHILE THE SECOND HALF OF THE WEEK
WILL BE WETTER, THE SYSTEMS LOOK TO REMAIN RATHER PROGRESSIVE
ACROSS THE REGION. AT THIS TIME, NO RIVER FLOODING IS EXPECTED
OVER THE NEXT 7 DAYS.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...NONE.
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