Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 020252
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
752 PM PDT FRI AUG 1 2014

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

HIGH PRES CNTR RMNS W OF THE W OF THE WA/OR WTRS THIS EVENING
WHILE TROF IS ALG THE NRN AND CNTRL AREAS OF CA. THERE IS SOME
INTENSIFICATION OF TROF INTO SUN NGT...ALTHO IT APRS LESS STG AS
LAST NGTS MDL GUID. HIGHEST SEAS WERE ALG THE ERN AREAS OF THE NRN
CA WTRS WITH SEAS TO 8 FT WHICH MATCHES WITH BOTH WWIII ENP AND
ECMWF WV GUID. FOR THE UPDATE WL CONT TO USE 30M GFS WINDS THRU
SAT AFTN THEN FAVOR THE ECMWF GUID AFTWDS THRU THE RMNDR OF PD MAINLY
DUE TO ITS BETTER DEPICTION OF CD FNT THAT MOVS INTO THE NRN AREAS
MON AND MON NGT.


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PREVIOUS DISCUSSION...

THE 18Z SFC ANALYSIS INDICATED A HIGH PRES RIDGE WEST OF THE
OFFSHORE WATERS WITH TROUGH INLAND OVER CENTRAL CA. ASCAT PASS
FROM 1730Z WITH COVERAGE OVER ONLY THE CENTRAL AND S CA WATERS
INDICATED WINDS MOSTLY IN THE 10 TO 20 KT RANGE...WITH A SMALL ARE
OF 20 TO 25 KT OVER THE FAR SW PORTION OF OUTER S CA WATERS.

THE 12Z MODELS ARE ON DECENT AGREEMENT THROUGH THE FCST PERIOD
WITH ONLY SUBTLE DIFFERENCES NOTED MON INTO TUE WITH THE HANDLING
OF COLD FRONT EXPECTED TO AFFECT THE WA/OR WATERS. FOR THE SHORT
TERM PERIOD TONIGHT INTO SUN WILL USE THE 30M GFS WINDS AS THEY
SEEM TO MORE ACCURATELY CAPTURE THE STRONGER WINDS OVER THE N CA/S
OREGON COASTAL WATERS. WILL USE THE 12Z ECMWF WINDS FROM 00Z SUN
THROUGH 00Z THU AS IT CONTINUES TO BE MORE IN AGREEMENT WITH OTHER
GLOBAL MODELS WITH THE WEAK COLD FRONT TO AFFECT THE PZ5 WATERS.
FOR THE REMAINDER OF THE PERIOD...HIGH PRES AGAIN REBUILDS INTO
THE AREA WITH MODELS IN DECENT AGREEMENT AND WILL USE THE GFS 30M
WINDS.

.SEAS...THE 18Z SEA STATE ANALYSIS INDICATED THAT THE OBSERVED
SEAS WERE WITHIN A FT OF THE WW3/ECMWF WAM MODEL FCST VALUES. AS
WITH PREVIOUS FCST...WILL USE THE ECMWF WAM WAVE VALUES THROUGH
00Z THU TO ACCOUNT FOR THE HIGHER SEAS OVER THE N CA/S OREGON
COASTAL AND OFFSHORE WATERS. WILL USE THE ENP VALUES FOR THE
REMAINDER OF THE FCST PERIOD.

.EXTRATROPICAL STORM SURGE GUIDANCE...N/A



.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
     NONE.

.PZ6 CALIFORNIA WATERS...
     NONE.

$$

.FORECASTER ROWLAND/KOSIER. OCEAN PREDICTION CENTER.


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