Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 201912
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
1212 PM 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 12Z SFC ANALYSIS SHOWS LOW PRES CNTRD NW OF THE
WASH/ORE WTRS...WITH A WARM FRONT EXTENDING SE. 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 THIS EVNG INTO
THU WITH A WKNG COLD FRONT PASSING ACROSS THE WATERS...THEN STALL
AND DSIPT OVER THE SRN ORE WATERS THU NIGHT. THE RDG WILL THEN
BUILD E AND NE FRI INTO MON AS THE COASTAL TROF STRENGTHENS.

MODELS...THE 12Z 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 10M TO
POPULATE THE WIND GRIDS THRU THE PRD. AM NOT PLANNING TO MAKE ANY
SIGNIF CHANGES TO THE CURRENT FCST TREND.

.SEAS...18Z 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. SINCE THE 12Z GFS IS BEING USED FOR THE WIND
GRIDS...WILL USE THE ENP VERSION OF THE 12Z MWW3 MDL FOR THE WAVE
HT GRIDS. 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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