802
FXUS66 KSEW 080343
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
843 PM PDT SAT JUN 7 2025
SYNOPSIS
UPPER LEVEL RIDGING OVER WESTERN WASHINGTON WILL BRING
WARMER TEMPERATURES SUNDAY AND MONDAY. A GRADUAL COOLING TREND
BEGINS ON TUESDAY AS THE RIDGE BEGINS TO WEAKEN. ON WEDNESDAY A
TROUGH WILL APPROACH THE COAST AND MOVE INLAND ON THURSDAY, WITH A
TROUGHING PATTERN FAVORED INTO THE WEEKEND.
SHORT TERM /TONIGHT THROUGH TUESDAY/
SATELLITE SHOWS MOSTLY
CLEAR SKIES ACROSS WESTERN WASHINGTON THIS EVENING. THE FORECAST
REMAINS LARGELY ON TRACK, WITH NO UPDATES NEEDED. THE PREVIOUS
DISCUSSION FOLLOWS BELOW. 14
AN UPPER LEVEL RIDGE OVER THE REGION WILL BRING VERY WARM
TEMPERATURES SUNDAY AND MONDAY. SUNDAY WILL BE THE HOTTEST DAY,
WITH HIGH TEMPERATURES IN THE UPPER 60S TO LOW 70S ALONG THE COAST
AND 80S TO LOW 90S ALONG THE INTERIOR (WARMEST TEMPERATURES ALONG
SOUTHWEST INTERIOR AND CASCADE FOOTHILLS). HIGH TEMPERATURES ON
MONDAY WILL BE A COUPLE DEGREES COOLER. IN ADDITION, LIMITED
OVERNIGHT RELIEF IS EXPECTED AS LOW TEMPERATURES ARE EXPECTED TO
STAY ON THE WARM SIDE. LOW TEMPERATURES ON SUNDAY WILL BE IN THE
MID 50S ALONG THE COAST AND UPPER 50S ALONG THE INTERIOR. MONDAY'S
LOW TEMPERATURES WILL BE SLIGHTLY WARMER WITH UPPER 50S TO LOW
60S ALONG THE INTERIOR. THE UPPER LEVEL RIDGE WILL BEGIN TO WEAKEN
ON TUESDAY, WITH HIGH TEMPERATURES COOLING INTO THE LOW 60S ALONG
THE COAST AND UPPER 70S TO LOW 80S ALONG THE INTERIOR.
LONG TERM /WEDNESDAY THROUGH SATURDAY/
A GRADUAL COOLING TREND
IS EXPECTED FOR THE REST OF THE WEEK AS AN UPPER LEVEL TROUGH
APPROACHES THE WASHINGTON COASTLINE ON WEDNESDAY AND MOVES INLAND ON
THURSDAY. THERE IS GENERAL AGREEMENT AMONG ENSEMBLE GUIDANCE THAT A
TROUGHING PATTERN WILL DOMINATE LATE IN THE WEEK INTO THE WEEKEND.
HOWEVER, THERE IS UNCERTAINTY IN TROUGH AXIS LOCATION AND STRENGTH
OF THE TROUGH. PRECIPITATION WISE, MODELS AT THIS TIME ARE KEEPING
WESTERN WASHINGTON GENERALLY DRY, WITH THE EXCEPTION OF THE
NORTH AND CENTRAL CASCADES THAT MAY SEE SOME LIGHT PRECIPITATION.
29
AVIATION
NORTH TO NORTHWEST FLOW WILL CONTINUE INTO SUNDAY WITH
AN UPPER RIDGE LOCATED OVER THE PACIFIC NORTHWEST. VFR CONDITIONS
INTO TONIGHT WITH MAINLY CLEAR SKIES. STRATUS MAY SLIDE INLAND ALONG
THE IMMEDIATE COAST TONIGHT, WITH POTENTIAL LIFR CIGS AT HQM INTO
SUNDAY AM. OTHERWISE, MOSTLY CLEAR ON SUNDAY. N/NW SURFACE WINDS
WILL BECOME LIGHT TONIGHT, BEFORE INCREASING AGAIN ON SUNDAY.
KSEA...VFR CONDITIONS WITH MAINLY CLEAR SKIES DURING THE TAF PERIOD.
N/NW SURFACE WINDS OF 7 TO 12 KTS INTO THIS EVENING WILL TRANSITION
MORE NE AT 5 TO 8 KTS TONIGHT. JD
MARINE
HIGH PRESSURE WILL REMAIN OVER THE COASTAL WATERS THROUGH
WEDNESDAY. NORTHERLY DIURNAL DRIVEN WINDS EXPECTED FOR THE INTERIOR
WATERS THROUGH TUESDAY. NORTHWEST WINDS WILL ALSO REMAIN ELEVATED
OVER THE COASTAL WATERS THROUGH NEXT WEEK. ONSHORE FLOW WILL
INCREASE MIDWEEK.
SMALL CRAFT ADVISORY WINDS ARE POSSIBLE BEGINNING SUNDAY EVENING
INTO NEXT WEEK FOR THE OUTER COASTAL WATERS. INCREASING ONSHORE FLOW
TUESDAY INTO WEDNESDAY WILL ALSO BRING POTENTIAL SCA WINDS DURING
THE EVENING PERIODS THROUGH THE STRAIT OF JUAN DE FUCA. IN ADDITION,
WILL NEED TO MONITOR THE POTENTIAL FOR ANY GALES IN THE STRAIT OF
JUAN DE FUCA MIDWEEK WITH THE INCREASED WEST WINDS.
SEAS OF 4 TO 6 FEET THROUGH SUNDAY MORNING WILL BUILD TO 8 TO 12
FEET MONDAY INTO TUESDAY. IN ADDITION, PERIODS WILL ALSO RANGE 8 TO
12 SECONDS LATER SUNDAY INTO MONDAY. JD
FIRE WEATHER
THE WARM AND DRY TREND WILL CONTINUE SUNDAY INTO
MONDAY AS AN UPPER LEVEL RIDGE MOVES ACROSS WESTERN WASHINGTON AND
LOW LEVEL ONSHORE FLOW COMES TO AN END. THIS WILL ELEVATE FIRE
WEATHER CONCERNS SUNDAY AND MONDAY AS MINIMUM RH VALUES WILL LIKELY
REACH AS LOW AS 25-35% OVER THE CASCADES AND CASCADE FOOTHILLS WITH
SLIGHTLY HIGHER PERCENTAGES OVER THE INTERIOR LOWLANDS. WHILE LIVE
FUELS ARE STILL WET ENOUGH TO CURB FIRE SPREAD, DEAD FUELS REMAIN
VERY DRY. IN ADDITION THE SNOWPACK IS BELOW NORMAL AND SOME
LOCATIONS ARE EXPERIENCING DROUGHT CONDITIONS. WINDS REMAIN LIGHT
ENOUGH INTO MONDAY SUCH THAT CRITICAL FIRE WEATHER CONDITIONS ARE
NOT EXPECTED BUT THE AREA IS DRYING OUT FAST. MOIST ONSHORE FLOW
WILL RETURN MONDAY NIGHT INTO TUESDAY.
SEW WATCHES/WARNINGS/ADVISORIES
WA...HEAT ADVISORY FROM 10 AM SUNDAY TO 10 PM PDT MONDAY FOR CITY OF
SEATTLE-DOWNTOWN EVERETT / MARYSVILLE AREA-EASTERN KITSAP
COUNTY-EASTSIDE-FOOTHILLS AND VALLEYS OF CENTRAL KING
COUNTY-FOOTHILLS AND VALLEYS OF PIERCE AND SOUTHERN KING
COUNTIES-FOOTHILLS AND VALLEYS OF SNOHOMISH AND NORTHERN
KING COUNTIES-FOOTHILLS AND VALLEYS OF THURSTON AND LEWIS
COUNTIES-FOOTHILLS AND VALLEYS OF THE NORTH CASCADES-
LOWLANDS OF LEWIS AND SOUTHERN THURSTON COUNTIES-LOWLANDS
OF PIERCE AND SOUTHERN KING COUNTIES-NORTHERN HOOD CANAL-
OLYMPIA AND SOUTHERN PUGET SOUND-SHORELINE / LYNNWOOD /
SOUTH EVERETT AREA-SOUTHERN HOOD CANAL.
PZ...NONE.
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