475  
FXUS66 KSEW 161537  
AFDSEW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SEATTLE WA  
840 AM PDT TUE OCT 16 2018  
   
SYNOPSIS
 
DRY WEATHER WILL CONTINUE INTO EARLY NEXT WEEK. THE  
UPPER RIDGE OF HIGH PRESSURE WILL BREAK DOWN EARLY NEXT WEEK.  
 

 
   
SHORT TERM
 
AN UPPER RIDGE OVER THE AREA WILL FLATTEN ON  
WEDNESDAY AS A SHORT WAVE PASSES TO THE NORTH THEN REBUILD OVER  
THE AREA ON THURSDAY. THERE MIGHT BE SOME HIGH CLOUDS AT TIMES  
WEDNESDAY AND THURSDAY. OTHERWISE IT LOOKS SUNNY THE NEXT FEW  
DAYS. PATCHY VALLEY FOG IS POSSIBLE EACH MORNING AS WELL. HIGHS  
WILL BE IN THE 60S WITH SOME LOWER 70S IN A FEW SPOTS TODAY AND  
WEDNESDAY. LOW LEVEL OFFSHORE FLOW WILL TURN WEAKLY ONSHORE LATER  
WEDNESDAY AND THURSDAY IN RESPONSE TO THE PASSING UPPER SHORT  
WAVE. THE UPSHOT WILL BE TO COOL HIGHS A FEW DEGREES ON THURSDAY.  
   
LONG TERM
 
DRY WEATHER WILL CONTINUE FRIDAY THROUGH MONDAY WITH  
HIGH PRESSURE ALOFT IN CONTROL. A STRONG UPPER RIDGE OVER THE  
AREA ON FRIDAY WILL GRADUALLY WEAKEN AND SHIFT INLAND OVER THE  
WEEKEND. A FRONT WILL APPROACH FROM THE WEST ON MONDAY BUT RAIN  
SHOULD HOLD OFF UNTIL MONDAY NIGHT OR TUESDAY. HIGHS WILL BE IN  
THE 60S EACH DAY WITH A GRADUAL COOLING TREND BACK TO NEAR NORMAL  
BY MONDAY. SCHNEIDER  
 

 
   
AVIATION
 
UPPER LEVEL HIGH PRESSURE REMAINS IN CONTROL TODAY  
WITH LIGHT NORTHERLY FLOW ALOFT. AT THE SURFACE, OFFSHORE FLOW  
CONTINUES. SOME PATCHY FOG AGAIN WEDNESDAY MORNING IN THE USUAL  
RIVER VALLEY LOCATIONS.  
 
KSEA...CLEAR SKIES. NORTHERLY WINDS UNDER 10 KTS. CEO  
 

 
   
MARINE
 
HIGH PRESSURE REMAINS IN CONTROL WITH OFFSHORE FLOW AT  
THE SURFACE THROUGH WEDNESDAY MORNING. SMALL CRAFT ADVISORY WINDS  
THROUGH THE WEST ENTRANCE TO THE STRAIT AND ADJACENT COASTAL  
WATERS WILL GRADUALLY EASE THROUGH THE AFTERNOON HOURS. THE HIGH  
WILL WEAKEN WEDNESDAY AND THURSDAY WITH SURFACE FLOW BECOMING  
LIGHT ONSHORE. NORTHWESTERLY ONSHORE FLOW PATTERN WILL CONTINUE  
INTO THE WEEKEND. CEO  
 

 
   
SEW WATCHES/WARNINGS/ADVISORIES
 
 
WA...NONE.  
PZ...SMALL CRAFT ADVISORY UNTIL NOON PDT TODAY FOR COASTAL WATERS  
FROM CAPE FLATTERY TO JAMES ISLAND OUT 10 NM-WEST ENTRANCE  
U.S. WATERS STRAIT OF JUAN DE FUCA.  
 

 
 

 
 
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