Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 010346
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
846 PM PDT TUE SEP 30 2014

.FORECAST DISCUSSION: MAJOR FEATURES/WINDS/SEAS/SIGNIFICANT
.WEATHER FOR THE NORTH PACIFIC N OF 30N AND E OF 150W.

ATTM I DONT PLAN ON MAKING ANY CHANGES TO THE CURRENT GRIDS OR
ASSOCIATED FCST. LATEST SCAT PASS MISSES THE AREA WITH HIGHEST
WINDS SO NO CONFORMATION ON GALES OFF CS CST.

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PREVIOUS DISCUSSION...

LATEST 1738Z ASCAT-A AND 1831Z ASCAT-B PASSES RETURNED WDSPRD 20
TO 25 KT ACRS SRN AND CENTRAL CA WTRS W OF 120W WHERE DATA IS AVBL
WITH ASCAT-A SHOWING HIGHER WNDS OF 30 KT IN THE CSTL WTRS BTWN PT
REYES AND CAPE MENDOCINO. BOTH PASSES MISS MUCH OF AREA NRN CA
OFSHR WTRS NWD WITH ASCAT-B NW 15 KT WRN WA WTRS AT PASS EDGE. SEA
STATE ANALYSES ARE TRENDING UP OFF CENTRAL AND NRN CA AS WNDS
INCREASE AND BEGINNING TO TREND DOWN IN PZ5 WTRS AS DECAYING NW
SWELL MOVS INTO AREA. SEAS ARE RUNNING WI A FOOT OF 6 HR FCST OF
12Z WAVE WATCH III ALTHO HAVE NOT RECEIVED RECENT ALTIMETER PASS
IN AREA.

THE OVERALL PATTERN HAS CHANGED LTL WITH LATEST MDL GUIDANCE CONTG
TO TAKE LOW PRES SYSTEMS NE TWD GLF OF AK...ONLY GIVING GLANCING
BLOWS TO NRN WTRS FM ASCD FNTS WITH PREFNTL WNDS STAYING BLO GALE
FORCE. OF MORE IMMEDIATE CONCERN IS NEAR TERM DVLPG NLY GALES OFF
NRN AND CENTRAL CA CST BY TONIGHT IN RESPONSE TO BLDG HIGH PRES
RDG INTO PZ5 WTRS AND STRENGTHENING CSTL TROF. FCSTS FM MDLS ARE
QUITE CONSISTENT THRU PRD SO PLAN TO NOT MAKE CHANGE IN CVRG AND
DURATION OF GALES. HAVE LOWEST CONFDC IN SRD EXTENT OF GALES TO
JUST S OF PIGEON PT WITH 12Z UKMET CONSISTENT IN EXTENDING 30 KT
10M WNDS S BRIEFLY TONIGHT. AS THE RDG STARTS TO SETTLE SE LATER
WED INTO FRI WHILE CSTL TROF EXTENDS N BUT WKNS...WNDS DIMINISH
OFF CA. MDLS TAKE A WEAK WRM FNT ACRS NW PZ5 AREA WED NIGHT INTO
THU AND A CDFNT APCHS WITH INCREASING WNDS THU NIGHT AND FRI
BEFORE DMSHG AS FNT SLOWS AND WKNS. MDLS NOW LEANING TWD KEEPING
FNT NW OF WTRS AS SERIES OF WAVES MOV ALG FNT...AND HIGH PRES
REBUILDS INTO PZ5 AREA INTO SUN. WINDS MAY TOUCH 30 KT FAR NW WA
WTRS EARLY FRI BEFORE DMSHG. POPULATED WITH GFS 10M WNDS LATER THU
AND BYND TO HANDLE SW FLOW. BEFORE THEN USED 50/50 BLEND OF GFS
10M WNDS WITH HIGHER 30M WNDS IN STRONGER NLY FLOW...WITH SLGT
FURTHER INCRS IN STRONGEST FLOW TONIGHT.

THE WAVE OUTPUT FROM THE 12Z WW3 GENERALLY LOOKS PRETTY GOOD
THROUGHOUT AND MADE MINOR ADJUSTMENT BEYOND THU ESPCLY NRN WTRS AS
WW3 AND ECMWF WAM DVLP DIFFERENCES OF UP TO 3 FT THERE.

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 TONIGHT INTO WED.
.PZZ825...INNER WATERS FROM POINT ARENA TO PIGEON POINT...
     GALE TONIGHT.
.PZZ830...INNER WATERS FROM PIGEON POINT TO POINT PIEDRAS BLANCAS...
     GALE TONIGHT.

$$

.FORECASTER SHAW/BANCROFT. OCEAN PREDICTION CENTER.



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