376
FXUS66 KSEW 080340
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
840 PM PDT THU MAY 7 2026
SYNOPSIS
HIGH PRESSURE WILL SLOWLY SHIFT INLAND OVER WESTERN WASHINGTON
TODAY AHEAD OF A WEAK AND MOSTLY DRY FRONTAL SYSTEM THAT WILL
SWING INLAND ON FRIDAY. HIGH PRESSURE WILL REBOUND OVER THE
WESTERN US OVER THE WEEKEND AND INTO NEXT WEEK, BRINGING DRIER
AND WARMER CONDITIONS TO THE REGION. CHANCES FOR LIGHT RAIN WILL
INCREASE TOWARDS THE MIDDLE OF NEXT WEEK AS AN UPPER LOW DROPS
FROM THE GULF OF ALASKA.
SHORT TERM /TONIGHT THROUGH SATURDAY NIGHT/
SATELLITE IMAGERY SHOWS THAT THE STRATUS HAS FINALLY MOSTLY
CLEARED, BUT HAS BEEN REPLACED BY HIGH CLOUDS AND A WEAK SYSTEM
BEGINS TO APPROACH THE AREA. ANOTHER ROUND OF STRATUS IS
EXPECTED TO EXPAND INLAND OVER THE PARTS OF THE REGION TONIGHT
AS ONSHORE FLOW CONTINUES.
A WEAK, DISSIPATING FRONTAL SYSTEM WILL APPROACH THE REGION ON
FRIDAY, BRINGING LITTLE MORE THAN LIGHT RAIN ALONG THE PACIFIC
COAST AND POTENTIAL FOR DRIZZLE THROUGH THE STRATUS LAYER.
INCREASED ONSHORE FLOW FROM THIS WEAK SYSTEM WILL BRING EXTRA
CLOUD COVER THAT WILL LOWER TEMPERATURES A FEW DEGREES FROM
TODAY.
HIGH PRESSURE WILL QUICKLY REBOUND OVER THE WESTERN US ON
SATURDAY, BRINGING IN WARMER AND DRIER CONDITIONS WITH PLENTY
OF SUN BREAKS AND HIGHS IN THE UPPER 60S TO MID 70S.
LONG TERM /SUNDAY THROUGH THURSDAY/
ENSEMBLES REMAIN IN GOOD AGREEMENT THAT HIGH PRESSURE WILL
REMAIN SITUATED OVER THE WESTERN US THROUGH MONDAY, BUT MODELS
BEGIN SHOWING A LARGE VARIANCE IN SOLUTIONS LATER TUESDAY AND
BEYOND. A WEAK SYSTEM ALONG THE PERIPHERY OF THE RIDGE WILL
BRING IN EXTRA CLOUD COVER ON SUNDAY ALONGSIDE A SLIGHT CHANCE
FOR RAIN ALONG THE NORTHERN COAST, WITH HIGHS MOSTLY TOPPING OUT
BELOW 70 DEGREES. THE RIDGE WILL BUILD BACK INTO WESTERN
WASHINGTON ON MONDAY, ALLOWING FOR SUNNY SKIES AND HIGHS IN THE
UPPER 60S TO MID 70S. CONDITIONS WILL WARM A FEW DEGREES INTO
TUESDAY AS HIGH PRESSURE MAINTAINS WARM AND DRY CONDITIONS
ACROSS WESTERN WASHINGTON.
ENSEMBLES STRUGGLE TO DEPICT THE TRACK OF A LOW PRESSURE SYSTEM
MID WEEK, WITH SOME MEMBERS BRINGING THE TROUGH ONSHORE ACROSS
THE PACIFIC NORTHWEST WHILE OTHER MEMBERS HAVE THE LOW STALLING
OFFSHORE. TEMPERATURES LOOK TO REMAIN WARM, BUT THE UPPER TROUGH
MAY START TO REINTRODUCE SOME LIGHT PRECIPITATION CHANCES TO
PORTIONS OF THE AREA.
15
AVIATION
UPPER LEVEL RIDGE OVER THE AREA SHIFTING EAST OVERNIGHT.
WESTERLY FLOW ALOFT BECOMING SOUTHWESTERLY BY 12Z. DISSIPATING
FRONT MOVING THROUGH FRIDAY WITH INCREASING LOW LEVEL ONSHORE
FLOW BEHIND THE FRONT FRIDAY AFTERNOON INTO FRIDAY EVENING.
MIDDLE AND HIGH LEVEL CLOUDS OVERNIGHT. CEILINGS LOWERING TO
4000 TO 5000 FEET FRIDAY MORNING WITH LOCAL MVFR CEILINGS ALONG
THE COAST. CEILINGS IMPROVING LATER FRIDAY AFTERNOON.
KSEA...HIGH CLOUDS OVERNIGHT. CEILINGS LOWERING TO NEAR 4500
FEET 12Z-15Z FRIDAY. CEILINGS LIFTING BACK UP TO AOA 10000 FEET
AFTER 21Z. VARIABLE WIND LESS THAN 5 KNOTS BECOMING SOUTHWEST
09Z-12Z. SOUTHWEST WIND 10 TO 15 KNOTS 15Z-21Z EASING TO 4 TO 8
KNOTS AFTER 21Z. FELTON
MARINE
LIGHT ONSHORE FLOW TONIGHT. A WEAK FRONT WILL CROSS THE WATERS
FRIDAY. HIGH PRESSURE WILL REBUILD THIS WEEKEND FOR ONSHORE
FLOW. SCA WINDS POSSIBLE THROUGH THE STRAIT OF JUAN DE FUCA
DURING THE AFTERNOON AND EVENING HOURS FRIDAY THROUGH SUNDAY.
HYDROLOGY
THE DAILY HYDROLOGY DISCUSSION HAS ENDED UNTIL THE START OF THE NEXT
RAINY SEASON; IT WILL ONLY BE UPDATED DURING THIS TIME AS NEEDED.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...NONE.
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