523  
FXUS66 KSEW 290953  
AFDSEW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SEATTLE WA  
253 AM PDT FRI MAR 29 2024  
   
SYNOPSIS
 
AN UPPER LEVEL LOW WILL CONTINUE TO DRIFT SOUTHWARD  
TODAY, DECREASING SHOWER ACTIVITY OVER THE REGION. HIGH PRESSURE  
WILL START TO BUILD THROUGH THE WEEKEND, GIVING WAY TO WARMER AND  
DRIER CONDITIONS OVER THE AREA. A COOLER AND WETTER DISTURBANCE  
LOOK TO ARRIVE ON WEDNESDAY.  
 

 
   
SHORT TERM /TODAY THROUGH SUNDAY/
 
RADAR IMAGERY THIS MORNING  
SHOWS SHOWERS STILL DRIFTING THROUGH THE COAST AND INTO THE  
INTERIOR OF PUGET SOUND. SHOWER ACTIVITY WILL BEGIN TO DECREASE  
OVER WESTERN WASHINGTON AS WE HEAD INTO THE LATTER PART OF THE  
MORNING AND AFTERNOON, AS AN UPPER LEVEL LOW SINKS SOUTHWARD  
TOWARDS CALIFORNIA, PULLING AWAY THE MOISTURE FROM OUR AREA.  
 
CAN STILL EXPECT SOME LINGERING SHOWERS ESPECIALLY ALONG THE  
COAST AND IN THE MOUNTAINS THROUGHOUT TODAY, BUT ELSEWHERE, IT  
WILL BE A GENERALLY DRY AND RATHER NICE DAY. CLOUDS WILL BEGIN TO  
BREAK APART THIS AFTERNOON, LEADING TO SOME SUNSHINE AND HIGH  
TEMPERATURES IN THE UPPER 50S.  
 
AN UPPER LEVEL RIDGE WILL BEGIN TO BUILD OVER THE WEEKEND WITH  
NORTHERLY FLOW ALOFT, GIVING WESTERN WASHINGTON A WARMER AND DRIER  
WEEKEND AHEAD. TEMPERATURES WILL WARM GRADUALLY, WITH HIGH TEMPS  
ON SATURDAY AND SUNDAY HOVERING AROUND THAT 60 DEGREE MARK.  
   
LONG TERM /MONDAY THROUGH THURSDAY/
 
TEMPERATURES WILL CONTINUE  
TO WARM INTO MONDAY, AS UPPER LEVEL RIDGING REMAINS SITUATED OVER  
WESTERN WASHINGTON AND THE AFOREMENTIONED LOW STILL MEANDERING  
OVER CALIFORNIA. HIGH TEMPERATURES ON MONDAY WILL WARM INTO THE  
LOW/MID 60S FOR MUCH OF THE INTERIOR, WITH LOCATIONS NEAR THE  
WATER IN THE UPPER 50S. AS WE GET INTO TUESDAY, TEMPS LOOK TO  
STILL REMAIN IN THE MID 60S, MAYBE A TOUCH WARMER NEAR THE  
FOOTHILLS.  
 
THE WARMER AND DRIER WEATHER WILL SLOWLY FADE AWAY ON WEDNESDAY AS  
THE UPPER LEVEL RIDGE DAMPENS AND MOVES EASTWARD, OPENING A DOOR  
FOR UPPER LEVEL TROUGHING TO DEVELOP BACK ONCE AGAIN.  
 
A FRONTAL SYSTEM LOOKS TO MOVE SOUTHWARD FROM BC AND INTO THE  
PACIFIC NORTHWEST, LIKELY SWINGING A COLD FRONT THROUGH THE AREA  
THAT WOULD LEAD TO COOLER AND WETTER CONDITIONS INTO THURSDAY.  
 
MAZURKIEWICZ  
 

 
   
AVIATION
 
UPPER LEVEL LOW OFF THE NORTHERN CALIFORNIA COAST WILL  
CONTINUE TO MOVE SOUTH THROUGH SATURDAY. UPPER LEVEL RIDGE  
BUILDING WELL OFFSHORE. LIGHT FLOW ALOFT BECOMING NORTHERLY  
SATURDAY. IN THE LOWER LEVELS INCREASING NORTHERLY FLOW THIS  
AFTERNOON INTO THIS EVENING EASING OVERNIGHT INTO SATURDAY.  
 
CEILINGS MOSTLY IN THE 4000 TO 6000 FOOT RANGE THIS MORNING.  
ISOLATED CEILINGS NEAR 1000 FEET OVER THE KITSAP PENINSULA UNTIL  
16Z. CLOUDS SCATTERING OUT AFTER 21Z WITH MOSTLY CLEAR SKIES  
TONIGHT INTO SATURDAY. PATCHY FOG POSSIBLE SATURDAY MORNING  
10Z-16Z IN THE FOG PRONE LOCATIONS LIKE THE SOUTHWEST INTERIOR.  
 
KSEA...CEILINGS 5000 TO 6000 FEET INTO THE EARLY AFTERNOON HOURS.  
CLOUDS SCATTERING OUT 21Z-00Z. SOUTHERLY WIND 4 TO 8 KNOTS  
BECOMING NORTHERLY 4 TO 8 KNOTS AROUND 20Z. NORTHERLY WINDS  
INCREASING TO 10 TO 15 KNOTS 23Z-06Z. WINDS BECOMING NORTHEAST 4  
TO 8 KNOTS AFTER 06Z. FELTON  
 

 
   
MARINE
 
A SURFACE LOW OVER THE OFFSHORE WATERS WILL MOVE  
SOUTH AND WEAKEN TODAY. HIGH PRESSURE WILL BUILD OVER THE COASTAL  
WATERS TONIGHT INTO SATURDAY WITH THE LOW LEVEL ONSHORE FLOW  
PATTERN CONTINUING INTO THE FIRST PART OF NEXT WEEK.  
 
SMALL CRAFT ADVISORY WINDS OVER THE NORTHERN INLAND WATERS,  
ADMIRALTY INLET AND THE EAST ENTRANCE TO THE STRAIT OF JUAN DE  
FUCA WILL EASE THIS MORNING. SMALL CRAFT ADVISORY WESTERLY WINDS  
IN THE CENTRAL STRAIT AND EAST ENTRANCE TO THE STRAIT OF JUAN DE  
FUCA SATURDAY AND SUNDAY NIGHT.  
 
SEAS AROUND 11 FEET OVER THE COASTAL WATERS WILL SUBSIDE TO 9 FEET  
THIS AFTERNOON AND TO 5 OR 6 FEET TONIGHT. SEAS WILL REMAIN AROUND  
5 OR 6 FEET INTO THE FIRST PART OF NEXT WEEK. FELTON  
 

 
   
HYDROLOGY
 
NO RIVER FLOODING EXPECTED IN THE NEXT 7 DAYS.  
 

 
   
SEW WATCHES/WARNINGS/ADVISORIES
 
 
WA...NONE.  
PZ...SMALL CRAFT ADVISORY UNTIL 2 PM PDT THIS AFTERNOON FOR COASTAL  
WATERS FROM CAPE FLATTERY TO JAMES ISLAND 10 TO 60 NM-  
COASTAL WATERS FROM CAPE FLATTERY TO JAMES ISLAND OUT 10 NM-  
COASTAL WATERS FROM JAMES ISLAND TO POINT GRENVILLE 10 TO  
60 NM-COASTAL WATERS FROM JAMES ISLAND TO POINT GRENVILLE  
OUT 10 NM-COASTAL WATERS FROM POINT GRENVILLE TO CAPE  
SHOALWATER 10 TO 60 NM-COASTAL WATERS FROM POINT GRENVILLE  
TO CAPE SHOALWATER OUT 10 NM-GRAYS HARBOR BAR-WEST ENTRANCE  
U.S. WATERS STRAIT OF JUAN DE FUCA.  
 
SMALL CRAFT ADVISORY UNTIL 8 AM PDT THIS MORNING FOR ADMIRALTY  
INLET-EAST ENTRANCE U.S. WATERS STRAIT OF JUAN DE FUCA-  
NORTHERN INLAND WATERS INCLUDING THE SAN JUAN ISLANDS.  
 

 
 

 
 
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