Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 160348
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
848 PM PDT TUE APR 15 2014

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

A WK WRM FNT IS CROSSING THE NRN WTRS ATTM...OTRW EPAC HIGH
EXTENDING A RDG ACRS SRN PZ5 AREA COMBINED WITH A TROF NR CA CST
ARE PRODUCING NLY GALES OFF NRN AND CENTRAL CA CST MOSTLY
AFFECTING THE INNER ZONES CLOSER TO CSTL WTRS. THE PTRN IS SIMILAR
TO THAT SEEN IN EARLIER ASCAT-A PASS AND BEST REPRESENTED BY
12Z/18Z GFS 30M BL WNDS. THIS PTRN IS EXPECTED TO WKN AS A SERIES
OF STRONGER FNTL SYSTEMS IS EXPECTED TO IMPACT NRN WTRS WED NIGHT
THRU SUN...WITH THE STRONGEST EXPECTED TO PRODUCE GALES N OF CAPE
SHOALWATER FRI NIGHT WITH MDT LVL OF CONFDC.

WITH LTL CHG IN 18Z GFS FM PREVIOUS RUN...ATTM DO NOT PLAN ON
MAKING SGFNT CHANGES FOR THE EVENING UPDATE...WITH THE PREVIOUSLY
USED BLEND OF GFS/ECMWF LOOKING RSNBL BEYOND THU NIGHT.

SEAS...18Z ENP WW3 AND 12Z ECMWF WAM ARE SIMILAR AND LOOK RSNBL.
-----------------------------------------------------------------
PREVIOUS DISCUSSION...

THE GFS/ECMWF ARE IN VERY GOOD AGREEMENT THROUGHOUT THE FORECAST
PERIOD. THE OVERALL PATTERN WILL REMAIN PROGRESSIVE ACROSS THE PZ5
WATERS WITH A SERIES OF FRONTS AFFECTING THE REGION WITH A
MODERATE CHANCE OF GALES IN THE FAR NRN WATERS FRI NIGHT AS A
FRONT MOVES THROUGH. FURTHER S...THE MAIN FEATURE WILL BE
STRENGTH AND LOCATION OF THE RIDGE/TROF COMBINATION THAT IS
CURRENTLY PRODUCING GALES ALONG THE ERN PTNS OF NRN AND CENTRAL CA
WATERS. EXPECT THIS TREND TO CONTINUE OVR THE NEXT 24-36 HRS UNTIL
THE TROF WEAKENS AS A COLD FRONT APPROACHES LATER IN THE WEEK. I
POPULATED THE GRIDS WITH THE GFS 30M THROUGH 72 HRS...THEN BLENDED
THE ECWMF WITH GFS FOR THE REMAINDER OF THE FORECAST PERIOD. I
USED THE SAME PHILOSOPHY WHEN PRODUCING THE WAVE GRID. EXPECT SIG
SWELL TO OCCUR LATER IN THE WEEK AS STRONG SYSTEM MOVES INTO THE
GLFAK...AND THIS IS BOTH INDICATED BY THE WW3 AND ECMWF WAVE GUID.
MAY TWEAK THE WINDS UP A BIT IN PORTIONS OF CENTRAL CA WATERS IN
ORDER TO PRODUCE GALE CONDITIONS FOR A LONGER PERIOD.

.SEAS...
WW3 AND ECMWF WAVE GUIDANCE LOOK REASONABLE.

.EXTRATROPICAL STORM SURGE GUIDANCE...N/A

.WARNINGS...PRELIMINARY. ANY CHANGES WILL BE COORDINATED THROUGH
AWIPS 12 PLANET CHAT OR BY TELEPHONE:

.PZ5 WASHINGTON/OREGON WATERS...
.PZZ800...INNER WATERS FROM CAPE FLATTERY TO CAPE SHOALWATER...
     GALE POSSIBLE FRI NIGHT.
.PZZ900...OUTER WATERS FROM CAPE FLATTERY TO CAPE SHOALWATER...
     GALE POSSIBLE FRI NIGHT.

.PZ6 CALIFORNIA WATERS...
.PZZ825...INNER WATERS FROM POINT ARENA TO PIGEON POINT...
     GALE TONIGHT INTO WED.
.PZZ830...INNER WATERS FROM PIGEON POINT TO POINT PIEDRAS BLANCAS...
     GALE TONIGHT.

$$

.FORECASTER BANCROFT/SHAW. OCEAN PREDICTION CENTER.


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