951
FXUS66 KSEW 190954
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
254 AM PDT TUE MAY 19 2026
SYNOPSIS
THE WEATHER PATTERN REMAINS FAIRLY STEADY WITH HIGH PRESSURE
SITUATED OFFSHORE THROUGH THE WEEK WITH MORNING CLOUDS AND
AFTERNOON SUN. TEMPERATURES WILL RISE A BIT EACH DAY THROUGH
THE END OF THE WEEK BEFORE BEGINNING TO COOL OFF THIS WEEKEND
INTO EARLY NEXT WEEK.
SHORT TERM /TODAY THROUGH THURSDAY/
UPPER-LEVEL PATTERN REMAINING MOSTLY UNCHANGED WITH TROUGHING
OVER THE GREAT BASIN AND INTERMOUNTAIN WEST - A RIDGE REMAINS
JUST OFFSHORE THE PNW. HIGH CLOUDS ARE CURRENTLY STREAMING IN
UNDER NORTHWEST FLOW ALOFT. ANOTHER ROUND OF PATCHY FOG/LOW
STRATUS IS DEVELOPING THIS MORNING BUT COVERAGE WON'T BE
WIDESPREAD. LOW STRATUS/FOG WILL GIVE WAY TO MID TO HIGH CLOUDS
AND FILTERED SUNSHINE THIS AFTERNOON. A SHORTWAVE ROUNDING THE
PERIPHERY OF THE RIDGE WILL INCREASE SLIGHT (15-20%) POPS,
MAINLY ACROSS THE MOUNTAINS. HIGH TEMPERATURES ARE FORECAST IN
THE 60S ACROSS THE INTERIOR WITH 50S ALONG THE COAST. OVERNIGHT
LOWS WILL FALL INTO THE 40S.
UPPER-RIDGING IS LIKELY TO MAINTAIN THROUGH THURSDAY AS
CONDITIONS REMAIN RATHER BENIGN. TEMPERATURES ARE TO REMAIN
NEAR-SEASONAL ON WEDNESDAY BUT WARM READILY INTO THE 70S TO NEAR
80 F ACROSS THE INTERIOR ON THURSDAY. COASTAL AREAS WILL SEE
AFTERNOON HIGHS IN THE 60S WITH LOWS IN THE 40S AREA-WIDE.
LONG TERM /THURSDAY NIGHT THROUGH MONDAY/
WARMER CONDITIONS WILL CONTINUE INTO FRIDAY BEFORE MORE ROBUST
ONSHORE FLOW MOVE IN TOWARDS THE WEEKEND. TEMPERATURES WILL TOP
OUT FRIDAY INTO THE LOW TO MID 70S. THE RIDGE WILL FLATTEN AS
THE PATTERN TURNS MORE ZONAL OVER THE WEEKEND. THIS SHOULD HELP
TO NOT JUST START TO COOL TEMPERATURES, BUT ALSO BRING INCREASED
CHANCE FOR WIDESPREAD POPS INTO EARLY NEXT WEEK.
41
AVIATION
HIGH PRESSURE IS ANCHORED OFFSHORE WITH N/NW FLOW
OVER WESTERN WA TODAY. THE LOW LEVEL FLOW REMAINS ONSHORE. A
WEAK FRONT WILL MOVE INLAND THIS MORNING WITH IFR CEILINGS ALONG
THE COAST AND MVFR CONDITIONS IN THE INTERIOR. CEILINGS WILL
GRADUALLY IMPROVE TO LOW-END VFR THIS AFTERNOON IN THE INTERIOR.
SHOWERS WITH A CONVERGENCE ZONE POSSIBLE LATE THIS AFTERNOON AND
EVENING IN THE CENTRAL SOUND. IFR TO MVFR CEILINGS EXPECTED
ALONG THE COAST OVERNIGHT INTO WEDNESDAY MORNING. 33
KSEA...MVFR CEILINGS FORMING THIS MORNING WITH ONSHORE FLOW. SW
WINDS 5-8 KT. CLOUDS LIFTING TO 4000-5000 FT THIS AFTERNOON WITH
SHOWERS IN THE VICINITY 21-03Z. WINDS TURNING NORTHERLY AROUND
06Z. 33
MARINE
ONSHORE FLOW WILL PREVAIL THIS WEEK WITH HIGH
PRESSURE OFFSHORE AND LOWER PRESSURE INLAND. EXPECT DIURNAL
WESTERLY PUSHES THROUGH THE STRAIT OF JUAN DE FUCA WITH HIGHEST
WIND AND WAVES DURING THE LATE AFTERNOON AND EVENING HOURS. 33
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...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.
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