264
FXUS66 KSEW 041035
AFDSEW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
335 AM PDT FRI JUL 4 2025
SYNOPSIS
SEASONABLY WARM WEATHER FOR THE 4TH OF JULY HOLIDAY
IS EXPECTED AS A WEAK TROUGH PUSHES THROUGH THE AREA. A WARMING
TREND IS EXPECTED BY EARLY NEXT WEEK AS A RIDGE OF HIGH PRESSURE
BUILD ACROSS THE WESTERN STATES. TEMPERATURES ARE TRENDING ABOVE
AVERAGE FOR BOTH MONDAY AND TUESDAY.
SHORT TERM /TODAY THROUGH SUNDAY/
A WEAK TROUGH OFFSHORE IS
ENTERING THE REGION AS ITS BASE NOSES INTO OREGON AND NORTHERN
CALIFORNIA. THUNDERSTORMS HAVE BEEN OBSERVED WITH THIS DISTURBANCE
BUT ARE WELL AWAY FROM THE CWA AS THEY TRACK THROUGH CENTRAL
OREGON AND THE REST OF THE INLAND NORTHWEST AS THE DAY PROGRESS.
CAN'T RULE OUT A SLIGHT CHANCE (15%) OF SHOWERS OVER THE NORTH
CASCADES THIS AFTERNOON. OTHERWISE, A PLEASANT DAY IS IN STORE FOR
THE 4TH OF JULY HOLIDAY. SEASONAL TEMPERATURES ARE EXPECTED WITH
HIGHS FORECAST TO BE IN THE LOWER TO MID 70S ACROSS THE INTERIOR.
COASTAL AREAS GENERALLY IN THE 60S. TONIGHT, DRY CONDITIONS WILL
REMAIN AS THE AFOREMENTIONED TROUGH IS MODELED TO BE WELL EAST OF
THE CASCADES. OVERNIGHT LOWS WILL FALL INTO THE MID 40S TO LOWER
50S.
MORE ZONAL FLOW ALOFT SATURDAY INTO SUNDAY WITH DRY AND NEAR
NORMAL CONDITIONS FAVORED. A MODEST WARM UP WILL BE FELT ON SUNDAY
HOWEVER AS HEIGHTS RISE, INFLUENCED BY TROUGHING OFF THE COAST OF
CALIFORNIA AND HIGH PRESSURE OVER THE FOUR CORNERS REGION. HIGH
TEMPERATURES WILL AGAIN BE MOSTLY IN THE 70S BUT SOME 80S ARE
POSSIBLE TO CREEP UP THROUGH THE SW INTERIOR AND CASCADE VALLEYS
ON SUNDAY. OVERNIGHT LOWS IN THE 40S AND 50S.
LONG TERM /MONDAY THROUGH THURSDAY/
A WARMING TREND IS FAVORED
TO PERSIST INTO MONDAY AND TUESDAY AS ABOVE AVERAGE TEMPERATURES
BECOME MORE WIDESPREAD. HIGHS WILL TOP OUT IN THE 80S, POTENTIALLY
NEAR 90 FOR AREAS WITHIN THE CASCADE VALLEYS. WITH LOWS AROUND 60
FOR TUESDAY MORNING AROUND THE SEATTLE METRO, THERE IS THE
POTENTIAL FOR MODERATE HEATRISK FOR THOSE WHO ARE SENSITIVE TO
HEAT AND WITHOUT ADEQUATE COOLING/HYDRATION. GOING FORWARD, SOME
UNCERTAINTY EXISTS BY MID WEEK ON THE EXACT EVOLUTION OF THE MID-
LEVEL PATTERN. HOWEVER, TEMPERATURES ARE TRENDING COOLER IN THE
MOST RECENT MODELS RUNS AS A REPRIEVE FROM THE HEAT IS APPEARING
MORE FAVORABLE FOR WEDNESDAY AND THURSDAY.
MCMILLIAN
AVIATION
WEAK UPPER LEVEL TROUGH MOVING INLAND TODAY. THE
TROUGH WILL MOVE EAST OF THE CASCADES TONIGHT. SOUTH SOUTHEASTERLY
FLOW ALOFT BECOMING LIGHT THIS AFTERNOON AND THEN WESTERLY LATER
TONIGHT. IN THE LOWER LEVEL ONSHORE FLOW CONTINUING INTO SATURDAY.
HIGH LEVEL CLOUDS OVER THE AREA EARLY THIS MORNING. CLOUDS
LOWERING TO NEAR 10000 FEET LATER THIS MORNING THROUGH THIS
EVENING. WEAK CONVERGENCE LATER TONIGHT WITH CEILINGS NEAR 5000
FEET IN THE CENTRAL PUGET SOUND. MIDDLE AND HIGH LEVEL CLOUDS
CLEARING ELSEWHERE. MVFR STRATUS DEVELOPING ALONG THE COAST
06Z-09Z TONIGHT. STRATUS SPREADING INLAND REACHING PUGET SOUND
AREA 12Z-15Z. FELTON
KSEA...INCREASING MIDDLE AND HIGH LEVEL CLOUDS TODAY WITH CEILINGS
AOA 10000 FEET. CEILINGS LOWERING TONIGHT TO AROUND 5000 FEET WITH
WEAK CONVERGENCE. MVFR CEILINGS DEVELOPING 12Z-15Z SATURDAY.
NORTHEAST WIND 4 TO 8 KNOTS BECOMING WEST SOUTHWEST AROUND 18Z.
WINDS BECOMING SOUTH SOUTHWESTERLY AFTER 06Z SATURDAY. FELTON
MARINE
HIGH PRESSURE WILL REMAIN IN PLACE ACROSS THE COASTAL AND
OFFSHORE WATERS INTO THE FIRST PART OF NEXT WEEK WITH THERMALLY
INDUCED LOW PRESSURE EAST OF THE CASCADES. A WEAK FRONT WILL
APPROACH THE NORTHERN PORTION OF THE OFFSHORE WATERS TUESDAY.
DIURNAL WESTERLY PUSHES THROUGH THE STRAIT OF JUAN DE FUCA EACH
EVENING INTO EARLY NEXT WEEK. GALE FORCE WESTERLIES TONIGHT IN THE
CENTRAL AND EASTERN PORTION WITH SMALL CRAFT ADVISORY WINDS FOR
THE SAME AREA SATURDAY EVENING.
SMALL CRAFT ADVISORY NORTHWEST WINDS IN ADMIRALTY INLET TONIGHT
WITH THE GALE FORCE WINDS IN PORTIONS OF THE STRAIT OF JUAN DE
FUCA. FELTON
SEW WATCHES/WARNINGS/ADVISORIES
WA...NONE.
PZ...GALE WATCH FROM THIS AFTERNOON THROUGH LATE TONIGHT FOR CENTRAL
U.S. WATERS STRAIT OF JUAN DE FUCA-EAST ENTRANCE U.S.
WATERS STRAIT OF JUAN DE FUCA.
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