655
FXUS66 KSEW 050908
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
208 AM PDT TUE MAY 5 2026
SYNOPSIS
AN UPPER LEVEL RIDGE WILL REMAIN OVER WESTERN WASHINGTON THROUGH
THURSDAY, KEEPING TEMPERATURES ABOVE NORMAL. ONSHORE FLOW WILL
CONTINUE THROUGHOUT THE WEEK, BRINGING ROUNDS OF MORNING STRATUS
TO THE AREA. A DISSIPATING FRONTAL SYSTEM WILL MOVE INTO THE
REGION FRIDAY INTO SATURDAY, BRINGING THE NEXT CHANCE OF SOME
SHOWERS. ANOTHER RIDGE WILL BUILD INTO THE REGION SATURDAY
AFTERNOON INTO SUNDAY, BUT LOOKS TO WEAKEN EARLY NEXT WEEK.
SHORT TERM /TODAY THROUGH THURSDAY/
STRATUS CONTINUES TO GRADUALLY PUSH INLAND EARLY THIS MORNING,
WITH NIGHTTIME SATELLITE PRODUCTS INDICATING IT HAS MADE IT
INTO THE SOUTHERN SOUND. EXPECT STRATUS TO CONTINUE TO EXPAND
ACROSS PUGET SOUND THROUGH THE MORNING HOURS FOR SOME MORNING
CLOUD COVER ACROSS THE AREA. STRATUS WILL THEN SCATTER AND
RETREAT BACK TO THE COAST BY THE LATE MORNING/EARLY AFTERNOON
HOURS. TEMPERATURES AS A RESULT WILL BE A FEW DEGREES COOLER
THAN YESTERDAY'S, BUT WILL STILL BE ABOVE NORMAL, TOPPING OUT IN
THE MID 70S ACROSS MUCH OF THE INTERIOR. MINOR HEATRISK WILL
CONTINUE ACROSS THE INTERIOR AS A RESULT. THE COAST WILL STAY
COOLER UNDER THE MARINE LAYER, WITH TEMPERATURES EXPECTED TO TOP
OUT IN THE 60S.
HIGH PRESSURE WILL REMAIN IN CONTROL BOTH WEDNESDAY AND
THURSDAY FOR CONTINUED WARM AND DRY CONDITIONS ACROSS WESTERN
WASHINGTON. ONSHORE FLOW WILL ALSO CONTINUE, BRINGING ADDITIONAL
ROUNDS OF MORNING STRATUS TO THE AREA. AT THIS TIME, ONSHORE
FLOW LOOKS TO INCREASE AND BE THE STRONGEST WEDNESDAY NIGHT INTO
THURSDAY, WHICH WILL ALLOW FOR CLOUD COVER ON THURSDAY TO STICK
AROUND A BIT LONGER. TEMPERATURES WILL STILL TREND ABOVE NORMAL,
NEVERTHELESS, WITH AFTERNOON HIGHS EXPECTED TO BE IN THE UPPER
60S TO LOW 70S. MINOR HEATRISK WILL CONTINUE ACROSS PORTIONS OF
THE INTERIOR, BUT WILL GRADUALLY DECREASE IN EXTENT BOTH
WEDNESDAY AND THURSDAY.
LONG TERM /THURSDAY NIGHT THROUGH MONDAY/
A WEAK, DISSIPATING FRONT WILL APPROACH THE AREA ON FRIDAY,
BRINGING THE NEXT CHANCE OF SHOWERS. OVERALL AMOUNTS LOOK TO
REMAIN RATHER LIGHT, WITH SOME AREAS NOT EVEN EXPECTED TO SEE
ANY PRECIPITATION. LATEST PROBABILITIES STILL INDICATE LESS
THAN 10 PERCENT CHANCE OF THE AREA EXCEEDING 0.10" OF RAIN.
TEMPERATURES WILL COOL ON FRIDAY AND WILL ONLY TOP OUT IN THE
LOW TO MID 60S.
HIGH PRESSURE WILL THEN BUILD BACK INTO THE PACIFIC NORTHWEST IN
THE WAKE OF THE FRONT FOR ANOTHER PERIOD OF DRY WEATHER HEADING
INTO EARLY NEXT WEEK. TEMPERATURES WILL WARM A FEW DEGREES EACH
DAY, TOPPING OUT IN THE MID 70S FOR HIGHS BY SUNDAY. MINOR HEATRISK
WILL RETURN TO AREAS ACROSS THE INTERIOR, THOUGH THE COAST WILL
REMAIN COOLER, WITH TEMPERATURES ONLY EXPECTED TO BE IN THE
60S.
14
AVIATION
AN UPPER RIDGE AXIS CENTERED OFFSHORE TODAY WILL SHIFT INLAND
TONIGHT WITH NORTHERLY FLOW ALOFT BECOMING WEST TO NORTHWESTERLY.
MODERATE ONSHORE FLOW CONTINUES NEAR THE SURFACE. THE MARINE LAYER
WILL EXTEND INTO THE INTERIOR LOWLANDS THIS MORNING WITH WIDESPREAD
IFR OR LOW MVFR CEILINGS. THE STRATUS WILL BURN BACK TO NEAR THE
IMMEDIATE COASTLINE AFTER 18Z WITH VFR EXPECTED ACROSS MOST OF THE
INTERIOR FROM 20Z INTO THIS EVENING. THE STRATUS WILL MIGRATE INLAND
AGAIN TONIGHT WITH WIDESPREAD LOW MVFR OR IFR CEILINGS EXPECTED FOR
MOST TERMINALS AGAIN WEDNESDAY MORNING.
KSEA...STRATUS IS SPREADING INTO THE VICINITY OF THE AIRPORT AS OF
08Z AND IS EXPECTED TO SOLIDIFY INTO AN IFR OR LOW END MVFR CEILING
THAT WILL PERSIST INTO LATE MORNING BEFORE SCATTERING OUT TO VFR
THIS AFTERNOON. A RETURN OF SIMILAR CONDITIONS IS LIKELY FOR
WEDNESDAY MORNING. SURFACE WINDS S/SW 5 TO 10 KNOTS.
27
MARINE
VARYING DEGREES OF ONSHORE FLOW WILL PERSIST THROUGH THE WEEK AS A
SURFACE RIDGE REMAINS ANCHORED OFFSHORE WITH LOWER PRESSURE INLAND.
A WEAK SYSTEM PASSING NORTH OF THE AREA LATE WEDNESDAY WILL ENHANCE
THE ONSHORE FLOW. THIS WILL LEAD TO POSSIBLE WESTERLY GALES IN THE
CENTRAL AND EAST STRAIT WEDNESDAY EVENING AS WELL AS GUSTY NORTHWEST
WINDS AND STEEP SEAS FOR THE OUTER COASTAL WATERS.
27
HYDROLOGY
NO RIVER FLOODING EXPECTED OVER THE NEXT 7 DAYS.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...SMALL CRAFT ADVISORY UNTIL 5 AM PDT EARLY THIS MORNING FOR
CENTRAL U.S. WATERS STRAIT OF JUAN DE FUCA-EAST ENTRANCE
U.S. WATERS STRAIT OF JUAN DE FUCA.
SMALL CRAFT ADVISORY FROM 4 PM THIS AFTERNOON TO 3 AM PDT
WEDNESDAY FOR CENTRAL U.S. WATERS STRAIT OF JUAN DE FUCA-
EAST ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA.
GALE WATCH FROM WEDNESDAY AFTERNOON THROUGH LATE WEDNESDAY
NIGHT FOR CENTRAL U.S. WATERS STRAIT OF JUAN DE FUCA-EAST
ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA.
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