903
FXUS66 KSEW 111630
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
930 AM PDT SAT APR 11 2026
UPDATE
FIRST BAND OF PRECIPITATION THIS MORNING NOW JUST NORTH AND WEST
OF SEATTLE MOVING SLOWLY TO THE NORTHWEST. SECOND BAND JUST
MOVING INTO LEWIS COUNTY AT 9 AM/16Z. THIS BAND WILL REACH THE
CENTRAL PUGET SOUND LATE MORNING/EARLY AFTERNOON. CLOUDY SKIES
IN BETWEEN THE PRECIPITATION BANDS. CONVECTIVE TEMPERATURES LATE
THIS AFTERNOON IN THE UPPER 50S. CLOUD COVER WILL PREVENT
TEMPERATURES FROM GETTING THAT WARM WHICH WILL LIMIT THE
THUNDERSTORM CHANCES ACROSS THE AREA. CURRENT FORECAST HAS THE
TRENDS COVERED. NO FORECAST UPDATE THIS MORNING. SEE BELOW FOR
PREVIOUS DISCUSSION AND UPDATED AVIATION SECTION. FELTON
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 ARE
BEGINNING TO TRANSITION TO MVFR/IFR WITH SOME VFR CIGS REMAINING.
WILL SEE A MIXED BAG OF CEILINGS THROUGHOUT THE MORNING BEFORE
RETURNING BACK TO VFR LATER THIS AFTERNOON. SOUTHERLY WINDS 4 TO 8
KNOTS THIS MORNING BECOMING LIGHT AFTER 00Z.
KSEA...CEILINGS HAVE LOWERED TO MVFR THIS MORNING. MVFR CONDITIONS
WILL CONTINUE THROUGHOUT THE MORNING BEFORE IMPROVING TO VFR BY 21Z.
SOUTHERLY WINDS THIS MORNING 5 TO 10 KNOTS TURNING NORTHERLY AFTER
00Z.
MAZURKIEWICZ/MCMILLIAN
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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