Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 270247
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
647 PM PST THU FEB 26 2015

.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 MANY ADJUSTMENTS TO THE GRIDS OR
ASSOCIATED FORECAST...JUST AN OCCASIONAL TWEAK WHERE NEEDED.

-----------------------------------------------------------------
PREVIOUS DISCUSSION...

METOP-A/B ASCAT OVERPASSES RETURNED SOLID AREA OF 30 KT WINDS
ADJACENT TO THE CEN CAL WTRS WITH GALE FORCE FLAGS EMBEDDED WITHIN
THE RETURNS FAR E ACRS ZN825. RAPIDSCAT PASS FROM NEARLY IDENTICAL
VALID TIME ALSO RETURNED VERY SIMILAR OCEAN SURFACE WINDS ACRS THE
PZ5 WTRS AND WITH STGST CONDS INVOF PT REYES. 12Z GFS 30M WINDS
BEST REPRESENTATIVE OF THESE INITIAL GALE WINDS AND GUID SUGGESTS
THESE WINDS MEETING GALE CRITERIA FOR ANOTHER FEW HRS. AS ALLUDED
TO IN PREV DISC WL EXTEND WARNING HEADLINES INTO TNGT FOR ZN825
WITH EXPIRATION TIME JUST AFTER 0300Z.

THE AFTN GRIDS WL BE POPULATED USING THE GFS FOR THE DURATION OF
THE FCST. WL INCRS CONDS INITIALLY BY USING THE 30M WINDS THRU 06Z
TNGT...THEN AGAIN 18Z SAT THRU 00Z MON IN SECOND RND OF XPCTD
GALES.

OVRL GUID RMNS IN GREAT AGRMT THRU THE END OF THE FCST PRD TUE.
UPR RIDGE WL RMN AMPLIFIED W OF THE RGN NR 140W. UPR LOW / SW
TROF WL DIG S OVRNGT THRU THE WKND ALONG THE US WEST CST BFR MVG
INLAND MON AND TUE. AT THE SFC LOPRES OVER S VANCOUVER ISLAND WL
MOVE S ACRS THE CSTL PZ5 WTRS TNGT THRU FRI NGT...REDEVELOP NR
SAN FRAN BAY SAT NGT INTO ERLY SUN...THEN DSIPT LATER SUN INTO
MON. HIGH PRES WL BUILD SSE BHND THE FROPA/LOPRES AND THE INCRS
PRES GRAD WL SUPPORT GALES ACRS N CAL WTRS SAT EVE INTO SUN. WITH
ALL 12Z GLOBAL GUIDANCE ON BOARD CONFDC IS HIGH WITH FORCAST GALES.
12Z GUID DOES SUGGEST ANOTHER REPEAT SCENARIO MON INTO TUE ACRS
THE OFSHR WTRS...HOWEVER PRES GRAD NOT QUITE AS STRG AS THIS
UPCOMING WKD. FOR NOW WL CAP WINDS TO 30 KT MON AND TUE AND AWAIT
FUTURE GUID.

SEAS...LATEST SEA STATE ANALYSIS INDC HIEST VALUES
TO 15 FT WHICH MATCHED BEST WITH 12Z ECMWF WAM. WL USE THIS GUID
INITIALLY...THEN TRANSITION THE FCST TO A 50/50 BLEND FOR THE
RMNDR OF THE FCST.

.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
.PZZ815...INNER WATERS FROM FLORENCE OR TO POINT ST. GEORGE...
     GALE SAT.
     GALE POSSIBLE SAT NIGHT.

.PZ6 CALIFORNIA WATERS...
.PZZ820...INNER WATERS FROM POINT ST. GEORGE TO POINT ARENA...
     GALE SAT.
     GALE POSSIBLE SAT NIGHT INTO SUN.
.PZZ920...OUTER WATERS FROM POINT ST. GEORGE TO POINT ARENA...
     GALE SAT.
     GALE POSSIBLE SAT NIGHT.
.PZZ825...INNER WATERS FROM POINT ARENA TO PIGEON POINT...
     GALE TODAY.
     GALE POSSIBLE SAT NIGHT.
.PZZ925...OUTER WATERS FROM POINT ARENA TO PIGEON POINT...
     GALE POSSIBLE SAT NIGHT.

$$

.FORECASTER SHAW/COLLINS. OCEAN PREDICTION CENTER.



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