Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 201405
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
705 AM PDT WED AUG 20 2014

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

SUMMARY...THE 06Z SFC ANALYSIS INDICATED LOW PRES CNTRD NW OF THE
WASH/ORE WTRS...WITH A WARM FRONT EXTENDING SE. LATEST AVAIL ASCAT
PASSES FROM EARLIER THIS RMNG INDICATE A SWATH OF 25 TO 30 KT
WINDS EXTNDG INTO THE NW WASH OFSHR WTRS. A HI PRES RDG PREVAILS
JUST W OF THE OFSHR AREAS...WITH A LOW PRES TROF NEAR THE CALIF
CST. THE LOW NW OF THE WASH/ORE WTRS WILL MOVE SE TODAY INTO THU
WITH A WKNG COLD FRONT PASSING ACROSS THE WATERS...THEN STALLING
OVER THE SRN ORE WATERS THU NIGHT AND DISSIPATING. THE RDG WILL
THEN BUILD E AND NE FRI INTO SUN AS THE COASTAL TROF STRENGTHENS.

MODELS...THE MED RNG MDLS ARE ALL VRY GUD AGREEMNT THRU THE FCST
PRD...AND THE MDLS KEEP THE WINDS SUB-GALE OVER ALL OF THE ZONES
DURING THE FCST PRD. WILL USE THE REPRESENTATIVE GFS 30M TO
POPULATE THE WIND GRIDS THRU THE PRD. AM NOT PLANNING TO MAKE ANY
SIGNIF CHANGES TO THE CURRENT FCST TREND.

.SEAS...12Z RP1 SEA STATE ANALYSIS SHOWS THAT OBSERVED SHIP AND
BUOY OBS ARE GENERALLY WITHIN A FOOT OF THE MULTIGRID WW3 AND ECMWF
WAM WAVE HT VALUES. THE MWW3 AND ECMWF WAM ARE IN GUD OVERALL
AGREEMNT BUT THERE ARE MINOR DIFFS AT TIMES...SO WILL USE A 50/50
BLEND OF MWW3/ECMWF WAM THRU THE FCST PRD TO SMOOTH OUT THE DIFFS.
LONGER PERIOD SWELL FROM T.S. LOWELL IS EXPCTD TO ENTER THE SRN
PZ6 ZONES DURING THE THU THRU SUN NITE TIMEFRAME.

.EXTRATROPICAL STORM SURGE GUIDANCE...N/A.

.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS... NONE.

.PZ6 CALIFORNIA WATERS... NONE.

$$

.FORECASTER SCOVIL. OCEAN PREDICTION CENTER.



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