731
FXUS66 KSEW 242120
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
220 PM PDT THU APR 24 2025
SYNOPSIS
HIGH PRESSURE WILL MAINTAIN WARM AND DRY CONDITIONS
THROUGH FRIDAY. SPLIT FLOW ALOFT WILL KEEP CONDITIONS MOSTLY DRY
AND MILD THROUGH THE WEEKEND. CHANCES FOR PRECIPITATION INCREASE
MONDAY AND TUESDAY AS A SYSTEM MOVES OVER THE PACIFIC NORTHWEST,
WITH DRY AND WARMER CONDITIONS RETURNING BY MID-WEEK.
SHORT TERM /TONIGHT THROUGH SUNDAY/
HIGH PRESSURE GIVING DRY
AND MILD CONDITIONS TO WESTERN WA TODAY AND FRIDAY. TEMPERATURES
ARE MAINLY IN THE 60S WITH A FEW SPOTS IN THE INTERIOR REACHING
THE LOWER 70S LATE THIS AFTERNOON. EXPECT SIMILAR CONDITIONS ON
FRIDAY EXCEPT FOR THE COAST WHICH WILL SEE MORNING STRATUS.
DRY CONDITIONS EXTEND THROUGH THE WEEKEND AS AN UPPER LOW DRIFTS
TO OUR SOUTH (OVER CA). HEIGHTS ARE A LITTLE LOWER AND
TEMPERATURES WILL BE MOSTLY IN THE 60S. ONSHORE FLOW WILL INCREASE
SATURDAY NIGHT AND SUNDAY FOR MORE LOW CLOUDS AND STRATUS. HIGHS
SUNDAY WILL REACH THE LOWER TO MID 60S WITH 50S ALONG THE COAST.
33
LONG TERM /MONDAY THROUGH THURSDAY/
OUR NEXT CHANCE FOR SEEING
RAIN WILL BE NEXT WEEK MONDAY AND TUESDAY AS A WEAK/SPLITTING
FRONTAL SYSTEM MOVES INLAND. THIS PATTERN WILL KNOCK TEMPERATURES
CLOSER TO AVERAGE WITH HIGHS NEAR 60, AND LOWS IN THE 40S. SNOW
LEVELS REMAIN HIGH (5000-6000 FT) WITH JUST A FEW INCHES OF SNOW
ON THE HIGHER MOUNTAIN PEAKS. DRIER WEATHER IS IN STORE HEADING
TOWARD MIDWEEK AS HIGH PRESSURE REBUILDS OVER THE PAC NW. 33
AVIATION
AN UPPER RIDGE WILL REMAIN OVER THE NORTHERN PACIFIC
NORTHWEST INTO FRIDAY AS A CLOSED LOW DEVELOPS OFFSHORE OF
CALIFORNIA TONIGHT THROUGH FRIDAY. LIGHT SOUTH TO SOUTHEAST FLOW
ALOFT WILL CONTINUE INTO FRIDAY. CLEAR SKIES THIS AFTERNOON WITH A
FEW HIGH CLOUDS SPREADING NORTHWARDS INTO TONIGHT. GENERALLY CLEAR
SKIES ON FRIDAY OTHER THAN HIGH CLOUDS AT TIMES. IFR/LIFR STRATUS
MAY REACH HQM BETWEEN 13 TO 17Z FRIDAY MORNING, BUT LOW CLOUDS ARE
EXPECTED TO BE CONFINED TO THE SOUTH COAST. N/NW SURFACE WINDS INTO
THIS EVENING WILL BECOME LIGHT TONIGHT BEFORE INCREASING AGAIN
MIDDAY FRIDAY.
KSEA...CLEAR SKIES, WITH A FEW HIGH CLOUDS AT TIMES TONIGHT INTO
FRIDAY. NW WINDS OF 8 TO 12 KTS WILL BECOME NE AT 4 TO 8 KTS
TONIGHT. N/NW WINDS WILL INCREASE AFTER 18Z ON FRIDAY, WITH A FEW
GUSTS NEAR 15 KTS POSSIBLE FRIDAY AFTERNOON. JD
MARINE
NORTHERLY FLOW WILL CONTINUE INTO FRIDAY. WINDS WILL
INCREASE FURTHER FOR THE OUTER COASTAL WATERS FRIDAY AFTERNOON INTO
SATURDAY, RESULTING IN SMALL CRAFT ADVISORY WINDS DURING THIS
PERIOD. A SMALL CRAFT ADVISORY WAS ALSO ISSUED FOR THE INNER CENTRAL
AND SOUTHERN COASTAL WATERS FRIDAY AFTERNOON INTO FRIDAY EVENING DUE
TO A BRIEF PERIOD OF INCREASED NORTH WINDS. ONSHORE FLOW PATTERN
WILL DEVELOP LATER FRIDAY THROUGH THE WEEKEND, WHICH WILL ALSO
RESULT IN WESTERLY PUSHES THROUGH THE STRAIT OF JUAN DE FUCA. SCA
WINDS ARE EXPECTED BOTH FRIDAY NIGHT AND AGAIN LATE SATURDAY FOR THE
CENTRAL AND EASTERN PORTIONS OF THE STRAIT OF JUAN DE FUCA. A
FRONTAL SYSTEM WILL THEN MOVE THROUGH LATER MONDAY INTO TUESDAY FOR
INCREASING SOUTHWEST WINDS, ALTHOUGH EXPECTED TO REMAIN BELOW SCA
THRESHOLDS AT THIS TIME.
SEAS OF 5 TO 7 FEET TONIGHT WILL BUILD TO 8 TO 12 FEET FRIDAY NIGHT
THROUGH SATURDAY NIGHT. SEAS WILL SUBSIDE TO 3 TO 6 FEET EARLY NEXT
WEEK. JD
HYDROLOGY....HYDROLOGY
NO RIVER FLOODING IS EXPECTED OVER THE
NEXT 7 DAYS.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...SMALL CRAFT ADVISORY FROM 8 PM FRIDAY TO 5 AM PDT SATURDAY FOR
CENTRAL U.S. WATERS STRAIT OF JUAN DE FUCA-EAST ENTRANCE
U.S. WATERS STRAIT OF JUAN DE FUCA.
SMALL CRAFT ADVISORY FROM 3 PM TO 11 PM PDT FRIDAY FOR COASTAL
WATERS FROM JAMES ISLAND TO POINT GRENVILLE OUT 10 NM-
COASTAL WATERS FROM POINT GRENVILLE TO CAPE SHOALWATER OUT
10 NM.
SMALL CRAFT ADVISORY FROM 5 PM FRIDAY TO 6 PM PDT SATURDAY FOR
COASTAL WATERS FROM CAPE FLATTERY TO JAMES ISLAND 10 TO 60
NM-COASTAL WATERS FROM JAMES ISLAND TO POINT GRENVILLE 10
TO 60 NM-COASTAL WATERS FROM POINT GRENVILLE TO CAPE
SHOALWATER 10 TO 60 NM.
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