905  
FXUS66 KSEW 210334  
AFDSEW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SEATTLE WA  
834 PM PDT SAT JUL 20 2019  
   
SYNOPSIS
 
WARM AND DRY WEATHER RETURNS FOR SUNDAY. A WEAK  
WEATHER SYSTEM WILL BRING COOLER TEMPERATURES LATER TUESDAY INTO  
WEDNESDAY BEFORE HIGH PRESSURE REBUILDS OVER THE REGION FOR WARMER  
AND DRIER CONDITIONS THURSDAY AND FRIDAY.  
 

 
   
SHORT TERM /TONIGHT THROUGH TUESDAY/
 
AN UPPER RIDGE WILL SHIFT  
INLAND SUNDAY BUT UPPER HEIGHTS WILL ACTUALLY RISE ACROSS WESTERN  
WASHINGTON FOR A SUNNY AND WARMER DAY. HIGHS SHOULD BE MOSTLY IN  
THE 80S FOR THE INTERIOR AND 70S ELSEWHERE.  
 
AN UPPER TROUGH AROUND 135W WILL SLOWLY SHIFT EAST ON MONDAY. THE  
MAIN AFFECT WILL BE TO INCREASE LOW LEVEL ONSHORE FLOW FOR THE  
AREA. THIS WILL COOL HIGHS SEVERAL DEGREES AND BRING SOME MORNING  
CLOUDS TO THE COAST AND PARTIALLY INLAND OVER THE SOUTHWEST  
INTERIOR.  
 
THE UPPER TROUGH WILL MOVE TO THE COAST ON TUESDAY. THE COOLING  
TREND WILL CONTINUE WITH HIGHS BACK TO NEAR NORMAL. LOW CLOUDS  
SHOULD COVER MOST OF THE LOWLAND TUESDAY MORNING THEN BURN BACK  
TO THE COAST IN THE AFTERNOON. THERE WILL ALSO BE A SLIGHT CHANCE  
OF SHOWERS LATE IN THE DAY AND INTO TUESDAY NIGHT AS THE UPPER  
TROUGH MOVES OVERHEAD AND THE AIR MASS BECOMES A BIT UNSTABLE.  
SCHNEIDER  
   
LONG TERM /WEDNESDAY THROUGH SATURDAY/
 
PREVIOUS  
DISCUSSION...ONSHORE FLOW WILL PREVAIL THROUGH THE REST OF THE  
WEEK AND INTO THE WEEKEND. THE FORECAST IS LOOKING DRY WITH WEAK  
RIDGING OVER THE REGION. WE'LL LIKELY SEE MORNING LOW LEVEL  
STRATUS CLOUDS WITH SUNBREAKS IN THE AFTERNOON. TEMPERATURES  
THROUGH THE PERIOD ARE CLOSE TO NORMAL. 33  
 

 
   
AVIATION
 
AN UPPER RIDGE OVER THE AREA WILL SHIFT INLAND  
TONIGHT AND SUNDAY WITH AN OFFSHORE UPPER TROUGH APPROACHING. AT  
THE SURFACE, WEAK ONSHORE FLOW WILL CONTINUE. THE AIR MASS IS DRY  
AND STABLE.  
 
KSEA...CLEAR SKIES. NORTHERLY WIND 5-10 KNOTS. SCHNEIDER  
 

 
   
MARINE
 
WEAK ONSHORE FLOW WILL PREVAIL THROUGH SUNDAY. ONSHORE  
FLOW WILL INCREASE EARLY NEXT WEEK AND CONTINUE THROUGH THE MIDDLE  
OF THE WEEK. SMALL CRAFT ADVISORY STRENGTH WEST WINDS ARE LIKELY  
EACH NIGHT FOR THE CENTRAL AND EASTERN STRAIT OF JUAN DE FUCA.  
SCHNEIDER  
 

 
   
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 FROM 5 PM SUNDAY TO 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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