009
FXUS66 KSEW 100515
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
1015 PM PDT THU APR 9 2026
SYNOPSIS
WARM AND DRY CONDITIONS PREVAIL ACROSS THE AREA THROUGH FRIDAY.
CHANCES FOR RAIN RETURN LATE FRIDAY INTO SATURDAY WITH MUCH
COOLER CONDITIONS BEGINNING THIS WEEKEND. SHOWERS WILL GRADUALLY
TAPER OFF SUNDAY WITH WEAK RIDGING ON MONDAY. A STRONGER LOW
PRESSURE SYSTEM LOOKS TO REACH THE AREA MID-WEEK.
SHORT TERM /TONIGHT THROUGH SATURDAY NIGHT/
WEAK UPPER LEVEL RIDGING WILL MOVE ACROSS THE AREA THURSDAY
NIGHT INTO FRIDAY OVER SOUTHERN BRITISH COLUMBIA WITH AN UPPER
LEVEL LOW MOVING INLAND ACROSS SOUTHERN OREGON AND NORTHERN
CALIFORNIA. MOSTLY CLEAR SKIES CONTINUE TODAY BUT HIGH CLOUDS
WILL BEGIN TO FILL IN MORE TONIGHT INTO FRIDAY. THIS WILL HELP
TO MODERATE LOW TEMPERATURES TONIGHT (INTO THE UPPER 30S TO MID
40S). WARM CONDITIONS CONTINUE FRIDAY WITH HIGHS IN THE 60S TO
LOW 70S.
MOISTURE WILL BEGIN TO MOVE NORTHWARD FROM OREGON INTO
SOUTHWESTERN WASHINGTON ALLOWING FOR CHANCES FOR SHOWERS TO
BEGIN LATE FRIDAY, BUT THE BULK OF THE PRECIPITATION IS
EXPECTED ON SATURDAY. HIGH TEMPERATURES WILL DROP INTO THE MID
TO UPPER 50S.
LONG TERM /SUNDAY THROUGH THURSDAY/
UNSETTLED CONDITIONS CONTINUE INTO SUNDAY AS SHOWERS BEGIN TO
TAPER OFF. MONDAY LOOKS TO REMAIN MOSTLY DRY AS WEAK, TRANSIENT,
UPPER LEVEL RIDGING MOVES ACROSS THE AREA AND THE UPPER LEVEL
LOW MOVES INLAND. COOLER AND MORE ACTIVE CONDITIONS THEN RETURN
MID-WEEK AS AN UPPER LEVEL TROUGH MOVES IN FROM THE NORTHWEST,
WHICH WILL BRING IN MORE WINDY AND WET CONDITIONS. LOWER SNOW
LEVELS WILL BRING LIGHT TO MODERATE SNOWFALL TO THE MOUNTAINS
AND PASSES. BELOW NORMAL TEMPERATURES RETURN WITH MORE FROST
CONDITIONS POSSIBLE WITH COLD MORNING LOWS.
62
AVIATION
SOUTHERLY FLOW ALOFT ACROSS THE REGION TONIGHT UNDER MOSTLY
CLEAR SKIES. AN UPPER LOW WELL TO THE SOUTH WILL SPREAD SOME
INCREASING HIGH CLOUDS OVER THE REGION, BUT VFR CONDITIONS
EXPECTED TO PREVAIL. FLOW ALOFT HAS TRANSITIONED MORE
SOUTH/SOUTHWESTERLY AND WILL CONTINUE INTO FRIDAY AS AN UPPER
LOW SLOWLY MOVES TOWARDS THE CALIFORNIA COAST. CONDITIONS REMAIN
VFR THIS AFTERNOON AND ARE EXPECTED TO CONTINUE THROUGH THE
MAJORITY OF THE TAF PERIOD. RAIN INCREASES FROM THE SOUTH FRIDAY
AFTERNOON AND EVENING. LIGHT WINDS OVERNIGHT.
KSEA...VFR CONDITIONS EXPECTED THROUGH THE MAJORITY OF THE TAF
PERIOD. LIGHT WINDS OVERNIGHT. EXPECT INCREASING HIGH CLOUDS
THROUGH THE DAY FRIDAY WITH MVFR CEILINGS AND THE ARRIVAL OF
RAIN AROUND AFTER 06Z SATURDAY.
12
MARINE
NORTHERLY WINDS WILL CONTINUE OVER THE AREA WATERS TONIGHT
THROUGH FRIDAY WITH HIGH PRESSURE SITUATED OVER THE NORTHEASTERN
PACIFIC AND A LOW MOVING INLAND INTO CALIFORNIA. A LOW PRESSURE
SYSTEM WILL MOVE SOUTHWARD TO THE WEST OF THE AREA WATERS ON
FRIDAY, BUT WILL NOT HAVE A SIGNIFICANT IMPACT TO THE AREA.
HIGH PRESSURE WILL THEN REBUILD OVER THE NORTHEASTERN PACIFIC
OVER THE WEEKEND, WHILE LOW PRESSURE REMAINS SITUATED ALONG THE
WEST COAST. ONSHORE FLOW WILL PERSIST AS A RESULT, WITH PERIODS
OF DIURNAL WESTERLY PUSHES EXPECTED ALONG THE STRAIT OF JUAN DE
FUCA AT TIMES. HIGH PRESSURE WILL THEN BUILD BACK INTO THE AREA
WATERS ON MONDAY. AT THIS TIME, THE STRONGEST WESTERLY PUSH
DOWN THE CENTRAL AND EASTERN STRAIT OF JUAN DE FUCA LOOKS LIKE
IT WILL BE MONDAY NIGHT INTO TUESDAY. A FRONTAL SYSTEM WILL
THEN MOVE THROUGH AREA WATERS LATE TUESDAY INTO WEDNESDAY. AT
THIS TIME, GUIDANCE CONTINUES TO INDICATE ROUGHLY A 40-60%
CHANCE FOR WINDS APPROACHING SMALL CRAFT CRITERIA FOR THE
COASTAL WATERS AND PORTIONS OF THE STRAIT OF JUAN DE FUCA.
SEAS WILL PRIMARILY RANGE BETWEEN 4-7 FT THROUGH THE WEEKEND AND
INTO EARLY NEXT WEEK, BEFORE APPROACHING 10 FT ON WEDNESDAY.
14
HYDROLOGY
NO RIVER FLOODING IS EXPECTED IN THE NEXT SEVEN DAYS.
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...NONE.
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