Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 272201
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
301 PM PDT MON APR 27 2015

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

HIGH PRES CENTERED W OF SRN CA OFSHR WTRS CONTS TO EXTEND A WKNG
RDG NE INTO NRN CA WTRS...WHILE A CDTL TROF ALG CA CST EXTENDS N
INTO SRN OREGON CSTL WTRS. DPNG LOW PRES 45N136W WITH A 1000 MB
CNTRL PRES AT 18Z IS TRACKING NNE TWD QUEEN CHARLOTTE ISL. 1715Z
AND 19Z ASCAT-A PASSES SHOW ONLY 20 KT OR LESS IN THE NLY FLOW
BTWN THE TROF AND RDG AND LIGHT WNDS IN THE RDG AND TROF. THESE
WNDS APPR CLOSE TO 12Z GFS 30M WNDS. TO THE NW THE 12Z ECMWF/UKMET
APPR TO HAVE BEST INITIALIZATION OF DPNG LOW W OF PZ5 WTRS. IN THE
FLOW ON THE E SIDE OF LOW BUOY 46005 HAS WNDS S 23G29 WITH PEAK 31
KT WHICH IS A BIT HIGHER THAN ECMWF BL WNDS...HENCE POPULATED
NEAR TERM WNDS THRU TUE WITH 12Z ECMWF WNDS BOOSTED BY 10 PCT AS
THAT MDL ALG WITH UKMET HAS BEST INITIALIZATION OF LOW PASSING NW
OF WTRS TONIGHT INTO TUE...WITH ASCD STORM FORCE WNDS STAYING W
AND NW OF WA WTRS. IN NEW FCST WILL HAVE GALES CONFINED TO OUTER
PZ5 WTRS N OF CAPE LOOKOUT...PEAKING AT 45 KT AT 06Z TUE IN THE
FAR NW...WITH GALES ENDING BY TUE MRNG AS LOW MOVES AWAY.

NEW FCST WILL START WITH WNDS ABOUT AS LOW AS THEY ARE GOING TO
GET DURING THE FCST PERIOD W OF CA AS THE PASSAGE OF LOW TO NW
AND ASCD CDFNT WKNS THE OFSHR RDG AND CSTL TROF SHFTS INLAND...AND
ASCD WNDS EXPECTED HIGHEST 25 KT IN CENTRAL CA WTRS. BY LATE TUE
NIGHT THE STRONGEST WINDS WILL SHIFT N TO THE AREA W OF POINT
REYES AND INCRS TO 30 KT AS SFC RDG REBUILDS TWD THAT AREA.
MINIMAL GALES ARE NOT OUT OF THE QUESTION IN NRN AND CENTRAL
PORTIONS OF THE PZ6 WATERS BY EARLY WED BUT FOR NOW BELIEVE THEY
WL BE CONFINED TO CSTL WTRS. HAVE GALES STARTING IN INNER WTRS PT
ARENA TO PIGEON PT LATER WED THEN EXPANDING N AND W REACHING FAR
SE OREGON WTRS AND ADJ OUTER PZ6 WTRS LATE THU AND THU
NIGHT...DMSHG FRI NIGHT AS UPR FLOW BCMS MORE ZONAL OVR NRN WTRS
AND A WK UPR TROF OR EVEN AN UPR LOW FORMS W OF CA. FARTHER
N...THE MODELS CONTINUE TO BRING A WEAK COLD FRONT OR TROF ACROSS
THE PZ5 WATERS WED...FOLLOWED BY ANOTHER WK FRONT FRI WITH EPAC
RDG BCMG RE-ESTABLISHED OVR PZ5 WTRS SAT. MDL CONSENSUS FAVORS 12Z
GFS AND USED 30M WNDS FOR WND GRIDS...EXCP INITIALLLY ECMWF AS
NOTED ABV.

POPULATED WAVE GRIDS WITH 12Z ECMWF WAM THRU TUE THEN USED 12Z ENP
WW3 THEREAFTER...EXCEP FOR THE PERIOD OF WED THRU THU NIGHT WHEN
75 PCT EC/25 PCT ENP IS USED.

EXTRATROPICAL STORM SURGE GUIDANCE...N/A.

.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
.PZZ900...OUTER WATERS FROM CAPE FLATTERY TO CAPE SHOALWATER...
     GALE TONIGHT.
.PZZ905...OUTER WATERS FROM CAPE SHOALWATER TO CAPE LOOKOUT...
     GALE TONIGHT.
.PZZ815...INNER WATERS FROM FLORENCE OR TO POINT ST. GEORGE...
     GALE POSSIBLE THU INTO FRI.

.PZ6 CALIFORNIA WATERS...
.PZZ820...INNER WATERS FROM POINT ST. GEORGE TO POINT ARENA...
     GALE POSSIBLE WED NIGHT INTO FRI NIGHT.
.PZZ920...OUTER WATERS FROM POINT ST. GEORGE TO POINT ARENA...
     GALE POSSIBLE THU NIGHT INTO FRI.
.PZZ825...INNER WATERS FROM POINT ARENA TO PIGEON POINT...
     GALE WED.
     GALE POSSIBLE WED NIGHT INTO THU NIGHT.
.PZZ925...OUTER WATERS FROM POINT ARENA TO PIGEON POINT...
     GALE POSSIBLE THU NIGHT.

$$

.FORECASTER BANCROFT. OCEAN PREDICTION CENTER.



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