814  
FXUS66 KSEW 061008  
AFDSEW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SEATTLE WA  
308 AM PDT SUN JUL 6 2025  
   
SYNOPSIS
 
A WARMING TREND WILL START THE WEEK AS AN UPPER RIDGE  
STRENGTHENS OVER WESTERN WASHINGTON. THE RIDGE WILL WEAKEN AND  
ONSHORE FLOW WILL INCREASE FOR A BRIEF COOLING TREND MIDWEEK  
BEFORE WARMER CONDITIONS RETURN AS UPPER RIDGING REBUILDS.  
 

 
   
SHORT TERM /TODAY THROUGH TUESDAY/
 
A WARMING TREND WILL BEGIN  
TODAY AS AN UPPER-RIDGE SETTLES OVERHEAD AND REMAIN INTO MONDAY.  
SUBSIDENCE ALOFT WILL DECREASE CLOUD COVERAGE AS THE DAY  
PROGRESSES AND INCREASE MAX TEMPS 5-6 DEGREES HIGHER FROM  
SATURDAY'S HIGHS. TEMPERATURES WILL TOP OUT IN THE MID 70S TO  
LOWER 80S THROUGHOUT THE INTERIOR. COASTAL AREAS ARE EXPECTED TO  
BE THE COOLEST AS ALWAYS WITH VALUES IN THE 60S. THE  
AFOREMENTIONED RIDGE AXIS WILL TRACK RIGHT OVER W WA ON MONDAY AS  
TEMPERATURES PEAK 7-10 DEGREES ABOVE AVERAGE. WIDESPREAD 80S ARE  
IN THE FORECAST WITH CASCADE VALLEY LOCATIONS TOPPING OUT NEAR 90  
F.  
 
WITH THE PREVIOUS NIGHT'S OVERNIGHT LOWS NEAR 60 F ACROSS THE  
SEATTLE METRO ALONG WITH ANOTHER ROUND OF HIGHS IN THE 80S, A  
MODERATE (ORANGE) THREAT FOR HEATRISK MUST BE EXPRESSED ON  
TUESDAY FOR THE METROPLEX. THIS LEVEL MAINLY AFFECTS THOSE  
SENSITIVE TO HEAT, ESPECIALLY THOSE WITHOUT ADEQUATE  
COOLING/HYDRATION. THE REST OF W WA WILL SEE A MINOR (YELLOW)  
THREAT. FORTUNATELY, A REPRIEVE WILL SOON BE ON THE WAY AS THE  
RIDGE TRACKS WELL OFF TOWARDS THE EAST BY TUESDAY NIGHT. OVERNIGHT  
LOWS WILL BOTTOM INTO THE MID 50S TO NEAR 60 F.  
 
   
LONG TERM /WEDNESDAY THROUGH SATURDAY/
 
A PATTERN CHANGE IS IN  
THE OFFING ON WEDNESDAY AS TEMPERATURES COOL SUBSTANTIALLY.  
ENSEMBLE GUIDANCE INDICATES A TROUGH CROSSING NORTHERN BRITISH  
COLUMBIA WITH INFLUENCE AS FAR SOUTH AS W WA. THIS WILL PROMOTE  
INCREASING ONSHORE ALONG WITH PRECIPITATION CHANCES WITH THE COAST  
AND NORTHERN HALF OF THE CASCADES SEEING THE BEST PROBABILITIES.  
UPPER RIDGING RETURNS LATE WEEK WITH TEMPERATURES RISING BACK  
ABOVE NORMAL.  
 
MCMILLIAN  
 

 
   
AVIATION
 
ZONAL FLOW ALOFT WILL GRADUALLY BECOME MORE  
NORTHWESTERLY TODAY AS UPPER RIDGING STARTS TO BUILD ACROSS THE  
AREA. ONSHORE FLOW WILL CONTINUE IN THE LOW LEVELS. ALL AREA  
TERMINALS REMAIN VFR THIS MORNING, WITH SATELLITE SHOWING JUST  
SOME HIGH CLOUDS OVER THE REGION AND SOME STRATUS DEVELOPING  
ACROSS THE FAR NORTHERN PORTIONS OF THE COAST. OVERALL, EXPECT VFR  
CONDITIONS TO PREVAIL FOR THE MAJORITY OF THE TERMINALS TODAY.  
THE EXCEPTION REMAINS KHQM, WHICH COULD STILL SEE SOME REDUCTIONS  
TO CIGS AND VIS IN ANY STRATUS DEVELOPMENT OR FOG EARLY THIS  
MORNING. ANY LOW CIGS THAT DO DEVELOP WILL LIKELY SCATTER OUT  
BETWEEN 15-18Z.  
 
SURFACE WINDS REMAIN MOSTLY NORTHERLY ACROSS THE SITES EARLY THIS  
MORNING, PRIMARILY PERSISTING AT 5-10 KT. EXCEPTIONS INCLUDE KHQM  
AND KCLM, WHICH REMAIN MORE WESTERLY. WINDS WILL EASE SLIGHTLY  
THROUGH THE MORNING, BEFORE INCREASING BACK TOWARDS 8-12 KT AGAIN  
BY LATE THIS AFTERNOON.  
 
KSEA...VFR CONDITIONS TO PREVAIL THROUGHOUT THE TAF PERIOD.  
NORTHERLY WINDS PERSIST AT 10-14 KT EARLY THIS MORNING. EXPECT  
WINDS TO EASE THROUGH THE MORNING HOURS, BEFORE INCREASING BACK TO  
8-12 KT BETWEEN 21-00Z.  
 
14  
 

 
   
MARINE
 
SURFACE HIGH PRESSURE WILL REMAIN CENTERED OFFSHORE AND  
WILL CONTINUE TO INFLUENCE THE COASTAL WATERS TODAY AND MONDAY.  
MEANWHILE, DIURNAL WESTERLY PUSHES WILL OCCUR ALONG THE STRAIT OF  
JUAN DE FUCA OVER THE NEXT SEVERAL EVENINGS. THE CURRENT PUSH OF  
WESTERLY WINDS IS STARTING TO WEAKEN AND WILL CONTINUE TO DO SO  
OVER THE NEXT FEW HOURS. THE PUSH TONIGHT DOES NOT LOOK AS STRONG,  
WITH PROBABILISTIC GUIDANCE INDICATING A 40-50 PERCENT CHANCE OF  
GUSTS MAKING IT TO SMALL CRAFT STRENGTH. HAVE OPTED TO LEAVE THE  
CENTRAL AND EAST STRAIT OUT OF AN ADVISORY FOR NOW, BUT THIS WILL  
BEAR WATCHING.  
 
A WEAK FRONTAL SYSTEM WILL APPROACH THE REGION TUESDAY NIGHT INTO  
WEDNESDAY AND MAY BRING A BRIEF UPTICK IN WINDS AND SEAS. HIGH  
PRESSURE WILL BUILD BACK INTO THE COASTAL WATERS IN ITS WAKE.  
 
SEAS WILL GENERALLY HOVER BETWEEN 3-6 FT OVER THE NEXT WEEK AND  
COULD BECOME STEEP AT TIMES WITH PERSISTENT NORTHERLY WINDS OVER  
THE COASTAL WATERS.  
 
14  
 

 
   
SEW WATCHES/WARNINGS/ADVISORIES
 
 
WA...NONE.  
PZ...SMALL CRAFT ADVISORY UNTIL 3 AM PDT EARLY THIS MORNING FOR  
CENTRAL U.S. WATERS STRAIT OF JUAN DE FUCA-EAST ENTRANCE  
U.S. WATERS STRAIT OF JUAN DE FUCA.  
 

 
 

 
 
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