469  
AGPN40 KWNM 201533  
MIMPAC  
 
MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN  
NWS OCEAN PREDICTION CENTER WASHINGTON DC  
833 AM PDT WED JUN 20 2018  
   
FORECAST DISCUSSION
 
MAJOR FEATURES/WINDS/SEAS/SIGNIFICANT  
.WEATHER FOR THE NORTH PACIFIC N OF 30N AND E OF 150W.  
 
A HIGH PRES AREA WAS W OF THE CA WATERS THIS MORNING WHILE  
A LOW PRES TROF WAS ALONG THE CENTRAL AND SRN AREAS OF CA.  
STRONGEST WINDS OVER THE OFFSHORE WATERS WERE ALONG THE INNER  
WATERS OF THE SRN CA WATERS WHERE WINDS WERE 20 TO 25 KT.  
MODEL GUIDANCE IS SIMILAR WITH WINDS GRADUALLY STRENGTHENING  
ALONG THE INNER WATERS OF THE CENTRAL AND SRN CA THROUGH TONIGHT  
AND EXPAND FURTHER N ALONG CA THU AND THU NIGHT. FOR THE UPDATED  
FORECAST WILL BE MAKING NO CHANGES TO PRIOR GRIDS WHICH LOOK GOOD  
OVER THE OFFSHORE WATERS.  
 
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PREVIOUS DISCUSSION...  
 
THE 06Z SURFACE ANALYSIS INDICATED HIGH PRESSURE CENTERED NEAR  
32N133W, WITH RIDGE EXTENDING NORTH INTO GULF OF ALASKA AND SOUTH  
TO SOUTH OF 30N. THE MOST RECENT ASCAT PASS FROM LATE TUESDAY  
EVENING INDICATED THE STRONGEST WINDS AROUND 20 KT OVER THE  
CENTRAL CALIFORNIA COASTAL AND OFFSHORE WATERS, AS WELL AS THE  
NORTHERN PORTION OF SOUTHERN CALIFORNIA WATERS. OTHERWISE, WINDS  
WERE LESS THAN 20 KT.  
 
THE 00Z MODELS CONTINUE TO BE IN VERY GOOD AGREEMENT DURING THE  
ENTIRE FORECAST PERIOD. A WEAK PRESSURE PATTERED WILL PERSIST THE  
NEXT FEW DAYS WHICH WILL RESULT IN WINDS MAINLY 20 KT OR LESS  
OVER THE OFFSHORE WATER, WITH SOME 25 KT WINDS OVER THE CENTRAL  
CALIFORNIA COASTAL WATERS. A TROUGH ALONG THE CALIFORNIA COAST  
WILL INTENSIFY FRIDAY AND FRIDAY NIGHT, AND MORESO SATURDAY INTO  
SUNDAY NIGHT. THE 00Z GFS CONTINUES TO INDICATE AREA OF GALES  
OVER THE CENTRAL AND NORTHERN CALIFORNIA COASTAL AND OFFSHORE  
WATERS AS EARLY AS FRIDAY NIGHT, AND THEN PERSISTING INTO  
SATURDAY NIGHT. THE GFS/UKMET AND ECMWF ALL REMAIN IN DECENT  
AGREEMENT INDICATING GALES OVER THESE AREAS, THOUGH TIMING IS NOT  
IN QUITE AS GOOD AGREEMENT. WILL CONTINUE TO USE THE GFS 10M  
WINDS THROUGH THE PERIOD AS IT HAS BEEN VERY CONSISTENT. THIS  
WILL RESULT IN FEW IF ANY CHANGES TO EXISTING WARNING HEADLINES.  
THE WINDS WILL DECREASE TO BELOW GALE SUNDAY AS THE COASTAL  
TROUGH WEAKENS.  
   
SEAS
 
THE 06Z SEA STATE ANALYSIS INDICATED THAT OBSERVED SEAS  
CONTINUE TO MATCH UP WELL WITH THE ENP FORECAST VALUES, AND SEE  
NO NEED TO DEVIATE FROM THE ENP THROUGHOUT.  
   
EXTRATROPICAL STORM SURGE GUIDANCE
 
N/A.  
 
   
WARNINGS
 
PRELIMINARY.  
   
PZ5 WASHINGTON/OREGON WATERS
 
 
NONE.  
   
PZ6 CALIFORNIA WATERS
 
   
PZZ820...INNER WATERS FROM POINT ST. GEORGE TO POINT ARENA
 
 
GALE POSSIBLE SATURDAY NIGHT.   
PZZ825...INNER WATERS FROM POINT ARENA TO PIGEON POINT
 
 
GALE POSSIBLE FRIDAY NIGHT INTO SATURDAY NIGHT.  
 

 
 
.FORECASTER ROWLAND/KOSIER. OCEAN PREDICTION CENTER.  
 
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