Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 010232
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
732 PM PDT TUE JUN 30 2015

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

STRONG HIGH PRES W OF THE PZ5 WATERS IS CURRENTLY COMBINING WITH A
LOW PRES TROF OVER CALIFORNIA TO PRODUCE NRLY WINDS UP TO 30 KT OR
SO OFF THE COAST OF NRN CALIFORNIA WITH THE STRONGEST CONDITIONS W
OF POINT ST GEORGE. WINDS UP TO 30 KT WILL CONTINUE ACROSS THE
OFFSHORE WATERS TONIGHT AND THEN BEGIN TO SLOWLY DIMINISH WED AND
WED NIGHT. STILL EXPECT NW GALES TO DEVELOP ACROSS NRN PORTIONS OF
THE PZ5 WATERS BY LATE FRI AS A LOW PRES TROF DEVELOPS OVER
VANCOUVER ISLAND. THE GALES WILL CONTINUE INTO SAT BEFORE
DIMINISHING SAT NIGHT. CURRENT FORECAST LOOKS REASONABLE AND FEW
CHANGES SHOULD BE NEEDED ON THE NEXT OFFSHORE FORECAST.

SEAS WILL CONTINUE TO BUILD OFF OF NRN CALIFORNIA TONIGHT AND BE
NEAR 12 FT BY EARLY WED. BY FRI NIGHT AND SAT SEAS ACROSS PORTIONS
OF THE WASHINGTON OFFSHORE WATERS WILL BUILD TO 14 OR 15 FT AS THE
NW GALES DEVELOP. FOR SEAS WILL CONTINUE TO USE THE NWW3
THROUGHOUT.

EXTRATROPICAL STORM SURGE GUIDANCE...N/A.

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

18Z OPC SFC ANALYSIS SHOWS A HIGH PRES RIDGE OVER THE PZ5/PZ6
WATERS W/A LOW PRES TROUGH INLAND OVER CA. AVAILABLE ASCAT HIRES
DATA SHOWED 10-20 KT WINDS OVER THE PZ5 WATERS...W/25 KT WINDS IN
THE FAR NRN PZZ800 ZONE. OVER THE CENTRAL PZ6 WATERS WHERE ASCAT
HIRES DATA WAS AVAILABLE 15-25 KT WINDS WERE NOTED W/THE STRONGEST
WINDS IN THE SE PZZ820 ZONE.

W/12Z GUIDANCE IN GOOD AGREEMENT OVER THE PERIOD SAW NO REASON TO
DEVIATE TOO FAR FROM THE ONGOING FORECAST IN PLACE. FAVORED 12Z
GFS THROUGH DAY 4 W/A BLEND OF THE 12Z GFS/ECMWF ON DAY 5. BIGGEST
CONCERN OVER THE FORECAST PERIOD REMAINS PERIOD OF GALES EXPECTED
IN PARTS OF THE NRN PZ5 WATERS HEADING INTO THE WEEKEND AS A LOW
PRES TROUGH OVER THE PACIFIC NW STRENGTHENS WHILE INTERACTING W/A
HIGH PRES RIDGE OVERHEAD. PREVIOUS TWO FORECAST BEGAN GALES FRI
DURING THE DAY...BUT W/THIS FORECAST UPDATE I DECIDED TO DELAY
THEM BY A FEW HOURS...W/THE ONSET OF GALES BEGINNING LATE FRI INTO
FRI NIGHT. WILL ALLOW GALES TO CONTINUE INTO SAT NIGHT THOUGH AS
HAS BEEN IN THE PREVIOUS TWO FORECASTS. BEYOND THAT NO OTHER
WARNING HEADLINES NEEDED OVER THE 5 DAY PERIOD W/WINDS ACTUALLY
WEAKENING TOWARDS DAY 5 AS THE HIGH PRES RIDGE WEAKENS SOMEWHAT
OVER THE WATERS.

.SEAS...FAVORED 12Z NWW3 OVER THE FORECAST PERIOD.

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


.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
.PZZ800...INNER WATERS FROM CAPE FLATTERY TO CAPE SHOALWATER...
     GALE POSSIBLE FRI INTO SAT.

.PZ6 CALIFORNIA WATERS...
     NONE.

$$

.FORECASTER NOLT/HOLLEY. OCEAN PREDICTION CENTER.


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