753  
FXUS66 KSEW 150311  
AFDSEW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SEATTLE WA  
811 PM PDT SUN AUG 14 2022  
   
UPDATE /0815 PM/
 
NO UPDATES TO THE FORECAST THIS EVENING. THE  
PREVIOUS FORECAST DISCUSSION WITH UPDATED AVIATION AND MARINE  
SECTIONS IS BELOW.  
 

 
   
SYNOPSIS
 
DRY CONDITIONS ARE EXPECTED FOR THE NEXT SEVERAL  
DAYS. THE REGION WILL SEE NEAR SEASONAL TEMPERATURES FOR THE NEXT  
COUPLE OF DAYS ALSO BEFORE A BUILDING RIDGE WARM THINGS UP  
TOWARDS MIDWEEK. TEMPERATURES MAY BEGIN TO GRADUALLY COOL DOWN  
TOWARDS THE WEEK'S END.  
 

 
   
SHORT TERM /TONIGHT THROUGH WEDNESDAY/
 
LOOKING AT THE BIG  
PICTURE, THERE'S BROAD TROUGHING APPARENT OVER THE GULF OF ALASKA  
IN CONCERT WITH RIDGING IN WEST-CENTRAL CONUS. HERE IN THE  
PACIFIC NORTHWEST, WE'RE SOMEWHERE IN BETWEEN WITH SOUTHWESTERLY  
FLOW ALOFT. WE LOOK TO STAY IN THIS REGIME TONIGHT THROUGH TUESDAY  
WITH TEMPERATURES NOT TOO FAR FROM SEASONAL VALUES. HOWEVER,  
TUESDAY NIGHT INTO WEDNESDAY WE'LL SEE A RIDGE BUILDING OUT OF THE  
GREAT BASIN AND INTO THE REGION. TEMPERATURES WILL BEGIN TO WARM  
DUE TO LARGE SCALE SUBSIDENCE. WE'LL GO FROM THE UPPER 70S TO LOW  
80S FOR BOTH MONDAY AND TUESDAY TO LOW 80S TO POSSIBLY NEAR 90 ON  
WEDNESDAY FOR MUCH OF THE INTERIOR.  
   
LONG TERM /THURSDAY THROUGH SUNDAY/
 
UPPER LEVEL RIDGING LOOKS  
TO REMAIN ON THURSDAY AS HIGH TEMPERATURES BEGIN TO PEAK. WE'LL  
SEE ANOTHER DAY OF TEMPS IN THE 80S TO LOW 90S. AS WE GO TOWARDS  
THE WEEKEND, THERE COULD BE AN INTRUSION OF MARITIME AIR INTO THE  
AREA, HELPING TO COOL THINGS DOWN TO SOME DEGREE. THERE'S STILL  
SOME DISAGREEMENT ON THE HOW PATTERN WILL EVOLVE BUT WE MAY SEE  
THE AFOREMENTIONED RIDGE SHIFT MORE INLAND, OPENING THE DOOR FOR  
UPPER LEVEL TROUGHING ALONG THE WEST COAST. BUT BEFORE WE GET  
THERE, SOME NOTABLY WARM DAYS ARE IN THE OFFING WHICH WILL BRING A  
MODERATE RISK OF HEAT ILLNESS FOR THOSE MORE SUSCEPTIBLE TO HEAT  
(SUCH AS THOSE WITHOUT ADEQUATE COOLING OR HYDRATION).  
 
MCMILLIAN  
 

 
   
AVIATION
 
WEST TO SOUTHWEST FLOW ALOFT WILL CONTINUE FOR WESTERN  
WASHINGTON TONIGHT AND MONDAY WITH AN UPPER TROUGH OFF THE COAST.  
AT THE SURFACE, WEAK ONSHORE FLOW WILL CONTINUE AS WELL WITH HIGH  
PRESSURE OFFSHORE AND LOWER PRESSURE INLAND. THE AIR MASS WILL BE  
STABLE.  
 
MOSTLY CLEAR TONIGHT WITH SOME PASSING HIGH CLOUDS. AREAS OF LOW  
CLOUDS ARE EXPECTED TO REDEVELOP AT THE COAST LATE AND SPREAD  
PARTIALLY INLAND MONDAY MORNING DOWN THE STRAIT OF JUAN DE FUCA  
AND THROUGH THE CHEHALIS GAP.  
 
KSEA...MOSTLY CLEAR. PATCHY LOW CLOUDS OVER THE SOUTH SOUND  
MONDAY MORNING ARE NOT EXPECTED TO AFFECT THE TERMINAL. NORTHWEST  
WIND 5-10 KNOTS WILL EASE AND BECOME MORE NORTHERLY TONIGHT. 33/16  
 

 
   
MARINE
 
ONSHORE FLOW WILL PREVAIL FOR THE NEXT SEVERAL DAYS  
WITH HIGH PRESSURE OFFSHORE AND LOWER PRESSURE INLAND. WESTERLY  
WINDS DOWN THE STRAIT OF JUAN DE FUCA WILL LIKELY REACH SMALL  
CRAFT ADVISORY STRENGTH EACH EVENINGS ALTHOUGH IT WILL BE  
MARGINAL MOST DAYS. STRONGER ONSHORE WILL DEVELOP LATE IN THE  
WEEK. SMALL CRAFT ADVISORY STRENGTH NORTHWEST WINDS ARE ALSO  
POSSIBLE OVER PARTS OF THE COASTAL WATERS IN THE MIDDLE OF THE  
WEEK. 16  
 

 
   
HYDROLOGY
 
THE DAILY HYDROLOGY DISCUSSION HAS ENDED UNTIL THE  
START OF THE NEXT RAINY SEASON; IT WILL ONLY BE UPDATED AS NEEDED  
UNTIL THEN.  
 

 
   
SEW WATCHES/WARNINGS/ADVISORIES
 
 
WA...NONE.  
PZ...SMALL CRAFT ADVISORY UNTIL 5 AM PDT MONDAY FOR CENTRAL U.S.  
WATERS STRAIT OF JUAN DE FUCA-EAST ENTRANCE U.S. WATERS  
STRAIT OF JUAN DE FUCA.  
 

 
 

 
 
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