Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 010301
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
701 PM PST SAT FEB 28 2015

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

LATEST RAPID SCAT PASS INDICATES MAINLY 20-30 KT ACROSS MUCH OF
OFFSHORE WATERS WITH HIGHEST WINDS ACROSS NW PTN OF CA
WATERS...THERE IS A SMALL AREA OF EMBEDDED 35 KT ALONG THE WRN
BNDRY OF ZONE 925. WILL MAKE MINOR ADJUSTMENDS TO GRIDS BASED ON
LATEST GFS RUN...WILL DROP MENTION OF GALES MNO AND MON NIGHT
ACROSS PTNS OF CA WATERS AS TREND HAS WEAKEND.

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PREVIOUS DISCUSSION...

THE 18Z SFC ANALYSIS INDICATED BROAD HIGH PRES RIDGE EXTENDING N
TO S ALONG 140W. LOW PRES WAS LOCATED NEAR SFO BAY AREA WITH
TROUGH EXTENDING N ALONG THE OREGON COAST. ASCAT PASS FROM AROUND
18Z DID INDICATE AN EXPANSIVE AREA OF 30 KT WINDS OVER THE OUTER
WATERS OF THE OREGON AND N CA WATERS...WITH SEVERAL 35 KT NOTED
OVER THE N CA OFFSHORE WATERS.

THE 12Z MODELS CONTINUE TO BE IN VERY GOOD AGREEMENT DURING THE
FCST PERIOD. THE GRADIENT OVERT HE SRN OREGON/N CA WATERS WILL
GRADUALLY WEAKEN OVERNIGHT AS THE LOW PRES MENTIONED ABOVE ALSO
WEAKENS. THE GRADIENT WILL STRENGTHEN AGAIN BRIEFLY LATE MON INTO
MON EVENING AS HIGH PRES MOVES S ALONG 140W. WILL POPULATE GRIDS
USING THE 30M GFS WINDS THROUGH THE PERIOD WHICH WILL RESULT IN
LITTLE CHANGE TO EXISTING WARNING HEADLINES. THE HIGH PRES RIDGE
WILL THEN SHIFT E ACROSS THE WATERS TUE THROUGH EARLY THU. LOOKING
AHEAD TO LATER THU AND THU NIGHT...ALL OF THE MODELS WITH THE
EXCEPTION OF THE ECMWF INDICATE LOW PRES STRENGTHENING AND
PASSING WELL W OF THE OFFSHORE WATERS BETWEEN 140W AND 150W. THE
GFS LOOKS TO BE A DECENT COMPROMISE BETWEEN THE UKMET/CMC FOR NOW.

.SEAS...THE 18Z SEA STATE ANALYSIS INDICATED THAT THE OBSERVED
SEAS WERE WITHIN A FT OF THE MWW3 FCST VALUES. WILL POPULATE GRIDS
USING THE MWW3 THROUGH 12Z MON...THEN WILL USE A 50/50 BLEND OF
THE MWW3/ECMWF 12Z MON AND BEYOND.

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


.WARNINGS...PRELIMINARY.

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

.PZ6 CALIFORNIA WATERS...
.PZZ820...INNER WATERS FROM POINT ST. GEORGE TO POINT ARENA...
     GALE TODAY INTO TONIGHT.
.PZZ920...OUTER WATERS FROM POINT ST. GEORGE TO POINT ARENA...
     GALE TODAY INTO TONIGHT.
.PZZ825...INNER WATERS FROM POINT ARENA TO PIGEON POINT...
     GALE MON.
     GALE POSSIBLE MON NIGHT.
.PZZ925...OUTER WATERS FROM POINT ARENA TO PIGEON POINT...
     GALE TONIGHT.
.PZZ830...INNER WATERS FROM PIGEON POINT TO POINT PIEDRAS BLANCAS...
     GALE POSSIBLE MON NIGHT.

$$

.FORECASTER SHAW/KOSIER. OCEAN PREDICTION CENTER.


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