578  
FXUS66 KSEW 040316  
AFDSEW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SEATTLE WA  
816 PM PDT THU JUL 3 2025  
   
UPDATE
 
MOSTLY CLEAR SKIES ACROSS WESTERN WASHINGTON THIS  
EVENING, WITH THE LATEST SATELLITE IMAGERY SHOWING CLOUDS MOVING  
FROM OREGON TOWARDS THE REGION. OTHERWISE, NO SIGNIFICANT UPDATES  
TO THE FORECAST THIS EVENING. PLEASE REFER TO AN UPDATED AVIATION  
AND MARINE SECTION.  
 

 
   
SYNOPSIS
 
SEASONABLY WARM WEATHER FOR THE 4TH OF JULY HOLIDAY  
IS EXPECTED WITH A WEAK TROUGH PUSHING THROUGH THE AREA LATE THIS  
WEEK. A WARMING TREND IS EXPECTED BY EARLY NEXT WEEK AS A RIDGE OF  
HIGH PRESSURE BUILD ACROSS THE WESTERN STATES.  
 

 
   
SHORT TERM /TONIGHT THROUGH SUNDAY/
 
A TROUGH MOVING THROUGH  
SOUTHERN CANADA WILL SLIDE EAST OVERNIGHT BUT ADDITIONAL TROUGHING  
WILL APPROACH THE REGION FROM THE WEST AS WELL. THIS WILL PROVIDE  
CONTINUED TRANQUIL WEATHER OVERNIGHT AND LOW TEMPERATURES ON THE  
COOL SIDE, FROM THE MID 40S TO 50S. AS THE TROUGH PUSHES EAST  
FRIDAY, IT LOOKS TO GENERATE THUNDERSTORM ACTIVITY BUT THIS IS  
EXPECTED TO REMAIN EAST OF THE FORECAST AREA. THIS WILL PROVIDE  
MORE CLOUDINESS IN THE AFTERNOON AND EVENING, BUT TEMPERATURES  
WILL WARM ABOVE TODAYS READINGS AND BE NEAR NORMAL IN THE MIDDLE  
TO UPPER 70S FOR HIGHS. THE TROUGH EXITS FRIDAY OVERNIGHT,  
ALLOWING A SOMEWHAT ZONAL FLOW OVER THE AREA WITH A SERIES OF WEAK  
SYSTEMS NEARBY. THIS WILL ALLOW FOR NEAR NORMAL CONDITIONS WITH  
LOWS IN THE 40S/50S AND HIGHS IN THE 70S AND NO SIGNIFICANT  
WEATHER OR IMPACTS EXPECTED. A SLIGHT WARMING TREND WILL SHAPE UP  
LATER ON SUNDAY AS HEIGHTS BEGIN TO RISE AND A FEW MORE LOWER 80S  
FOR HIGHS ARE EXPECTED ESPECIALLY SOUTH.  
   
LONG TERM /MONDAY THROUGH THURSDAY/
 
THE FIRST PORTION OF THE  
COMING WEEK SHOULD FEATURE A WARMING TREND. HEIGHTS WILL CLIMB  
ALONGSIDE A STRENGTHENING MID LEVEL RIDGE OF HIGH PRESSURE OVER  
THE FOUR CORNERS REGION. THIS WILL BRING HIGHS BACK ABOVE NORMAL  
ON MONDAY AND TUESDAY, WITH LOWER AND MID 80S MORE COMMON ACROSS  
THE REGION. WITH WARMING OVERNIGHT LOWS CLOSER TO 60 DEGREES BY  
TUESDAY MORNING, THE OVERALL HEAT IMPACT LEVELS WILL BEGIN TO INCH  
UP SOMEWHAT. THIS WILL BEAR MONITORING IN THE EXTENDED TIME  
PERIOD BY TUESDAY. SOME INCREASING UNCERTAINTY BY MID WEEK. THE  
CORNERS RIDGE BECOMES QUITE STRONG, HOWEVER A SERIES OF TROUGHS  
OVER THE NORTH PACIFIC MAY DO THEIR BEST TO HOLD MID LEVEL RIDGING  
AT BAY TO OUR SOUTH. THE CURRENT FORECAST INDICATES HIGHS  
REMAINING IN THE LOW TO MID 80S FOR THE MID-LATTER PART OF NEXT  
WEEK.  
 
ONE CONSTANT THROUGH THE NEXT SEVERAL DAYS IS THAT IT LOOKS TO  
REMAIN DRY ACROSS THE FORECAST AREA. STORMS ARE EXPECTED TO BE TOO  
FAR EAST AND THEN WITH RIDGING BUILDING IN THERE ARE NO RAIN  
CHANCES TO SPEAK OF.  
 

 
   
AVIATION
 
VFR THIS EVENING WITH CONVECTIVE DEBRIS CLOUDS MOVING  
NORTH FROM OREGON. NO THUNDERSTORM ACTIVITY IS EXPECTED IN WESTERN  
WASHINGTON. CLOUDS WILL CONTINUE TO SCATTER INTO TONIGHT WITH  
GENERALLY N/NW SURFACE WINDS. MVFR STRATUS DECK WILL REFORM ALONG  
THE COAST INTO THE EARLY MORNING FRIDAY AND EXPAND INLAND, LIKELY  
STAYING TO THE WEST OF THE PUGET SOUND.  
 
KSEA...VFR WITH NORTHERLY SURFACE WINDS BETWEEN 8 AND 10 KTS. VFR IS  
FAVORED TO CONTINUE THROUGH THE TAF PERIOD, WITH LOW POTENTIAL (15%  
TO 20%) OF MVFR CEILINGS IN LOW STRATUS DRIFTING EAST EARLY FRIDAY  
MORNING. NW TO NE WINDS 10 KT OR LESS WILL CONTINUE THROUGH MUCH OF  
THE PERIOD BEFORE SHIFTING SW LATER FRIDAY AFTERNOON.  
 
15/21  
 

 
   
MARINE
 
HIGH PRESSURE WILL REMAIN IN PLACE ACROSS THE COASTAL AND  
OFFSHORE WATERS TODAY, ALLOWING FOR EVENING WESTERLY PUSHES THROUGH THE  
STRAIT OF JUAN DE FUCA. THE CENTRAL AND EASTERN STRAIT WILL SEE WEST  
WINDS JUST BELOW SCA CRITERIA THIS EVENING. A FRONT WILL CROSS AREA  
WATERS ON FRIDAY, GENERATING ANOTHER ROUND OF STRONG WINDS THROUGH THE  
STRAIT. A GALE WATCH HAS BEEN ISSUED FOR FRIDAY EVENING THROUGH  
SATURDAY MORNING, BUT SOME UNCERTAINTY EXISTS OVER HOW STRONG THE WINDS  
WILL BE. A WEAK FRONT WILL DISSIPATE OVER THE OFFSHORE WATERS SATURDAY,  
WITH A SERIES OF WEAK FRONTS CROSSING AREA WATERS NEXT WEEK.  
 
SEAS WILL REMAIN BETWEEN 4 TO 7 FEET THROUGH THE PERIOD.  
 
15/21  
 

 
   
SEW WATCHES/WARNINGS/ADVISORIES
 
 
WA...NONE.  
PZ...GALE WATCH FROM FRIDAY AFTERNOON THROUGH LATE FRIDAY NIGHT FOR  
CENTRAL U.S. WATERS STRAIT OF JUAN DE FUCA-EAST ENTRANCE  
U.S. WATERS STRAIT OF JUAN DE FUCA.  
 

 
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab WA Page Main Text Page