622
FXUS66 KSEW 110933
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
233 AM PDT SAT APR 11 2026
SYNOPSIS
WET AND COOLER CONDITIONS THIS WEEKEND WITH A LOW
OFF THE COAST. 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 /TODAY THROUGH MONDAY/
AN UPPER LEVEL LOW WILL
SPIN OFFSHORE TODAY WHILE PUSHING MOISTURE NORTH INTO WESTERN
WA. THIS WILL LEAD TO WETTER CONDITIONS WITH RAIN THROUGH MUCH
OF THE DAY. SNOW LEVELS REMAIN HIGH OVER 5000 FT. DUE TO THE
CLOUDS AND RAIN WE'LL SEE COOLER CONDITIONS WITH HIGHS IN THE
50S. RAIN WILL TAPER OFF THIS EVENING AS THE LOW SLOWLY TRACKS
INLAND TO OUR SOUTH.
THE UPPER LOW WILL SPIN OVER NORTHERN CALIFORNIA ON SUNDAY WITH
JUST LIGHT SHOWERS OVER THE MOUNTAINS IN WESTERN WA. ONSHORE
FLOW WILL INCREASE SUNDAY NIGHT AS THE LOW MOVES FARTHER INLAND.
MODELS HINT AT A POSSIBLE CONVERGENCE ZONE FORMING IN SNOHOMISH
COUNTY WITH SHOWERS LINGERING OVERNIGHT.
ONSHORE FLOW CONTINUES INTO MONDAY FOR MORE CLOUDS AND A CHANCE
OF SHOWERS. TEMPERATURES WILL TRACK A FEW DEGREES COOLER THAN
AVERAGE WITH HIGHS IN THE LOWER TO MID 50S. 33
LONG TERM /MONDAY NIGHT THROUGH FRIDAY/
COOLER AND WETTER
CONDITIONS ARE FAVORED MOVING INTO TUESDAY AND WEDNESDAY AS A
DEEP UPPER LOW DROPS DOWN FROM B.C. THIS PERIOD WILL BRING
LOWLAND RAIN AND MOUNTAIN SNOW WITH SNOW EXPECTED AT THE
MOUNTAIN PASSES. SNOW LEVELS WILL HOVER AROUND 3000 FT ON
TUESDAY AND DROP TO AROUND 2000 FT ON WEDNESDAY. EXPECT HIGHS IN
THE 40S TO LOWER 50S WITH LOWS IN THE 30S. WE'RE UNDER DRIER
NORTH FLOW THURSDAY AND FRIDAY AS THE LOW SHIFTS SOUTHEAST AND A
RIDGE BUILDS OFFSHORE. SOUTH SOUND AREAS WILL SEE LOWS NEAR
FREEZING ONCE AGAIN WITH POTENTIAL FOR MORNING FROST. 33
AVIATION
SOUTHERLY FLOW ACROSS WESTERN WASHINGTON AS AN
UPPER LEVEL LOW OFFSHORE PUSHES SHOWERS UP ACROSS THE REGION.
CONDITIONS HAVE BEEN VFR EARLY THIS MORNING BUT WILL CHANGE AS
APPROACHING SHOWERS WILL LIKELY BRING A MIX OF MVFR/IFR
CONDITIONS TO AREA TERMINALS LATER THIS MORNING. WILL SEE A
MIXED BAG OF CEILINGS THROUGHOUT THE MORNING AND AFTERNOON
BEFORE RETURNING BACK TO VFR BY 00Z. SOUTHERLY WINDS 4 TO 8
KNOTS THIS MORNING BECOMING LIGHT AFTER 00Z.
KSEA...VFR CONDITIONS THIS MORNING AS SHOWERS APPROACH THE
TERMINAL FROM THE SOUTH. CEILINGS WILL LOWER TO MVFR EARLY THIS
MORNING, AROUND 12Z-15Z. MVFR CONDITIONS WILL CONTINUE
THROUGHOUT THE AFTERNOON BEFORE IMPROVING TO VFR BY 00Z. LIGHT
SOUTHWESTERLIES WILL TRANSITION MORE SOUTHERLY THIS MORNING 5 TO
10 KNOTS, EASING BY 00Z.
MAZURKIEWICZ
MARINE
SURFACE LOW PRESSURE WILL MOVE SOUTH OF THE COASTAL
WATERS THROUGHOUT TODAY. NO WIND OR SEA IMPACTS ARE EXPECTED
WITH THIS SYSTEM AS IT WEAKENS THROUGHOUT THE WEEKEND. WINDS
WILL GENERALLY REMAIN CALM AND BENIGN THROUGH THE WEEKEND.
WESTERLY WINDS WILL SLIGHTLY INCREASE IN THE STRAIT LATE SUNDAY
BUT LOOK TO BE BELOW SMALL CRAFT ADVISORY THRESHOLD FOR NOW. A
STRONGER FRONTAL SYSTEM ARRIVING TUESDAY INTO WEDNESDAY WILL
LIKELY YIELD HEADLINES WITH ENHANCED WINDS AND SEAS.
COASTAL SEAS 4 TO 6 FEET THROUGHOUT THE WEEKEND. SEAS WILL THEN
START TO BUILD UPWARDS TO 8 TO 10 FEET BY TUESDAY EVENING AND
REMAINING ELEVATED THROUGH THURSDAY.
MAZURKIEWICZ
HYDROLOGY
NO RIVER FLOODING IS EXPECTED IN THE NEXT SEVEN
DAYS.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...NONE.
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