Marine Interpretation Message
Issued by NWS

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000
AGPN40 KWNM 210916
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
216 AM PDT TUE APR 21 2015

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

SAT IMG HAS INDC SOME CLDS OVR THE REGON BUT NO LIGHTNG ABD THE
RADAR HAS NO TSTMS CELLS OVR THE REGION. AT 0000Z THE MAIN SYNOP
FEATURE IS HGH PRES 1032 MB CNTRD NR 40N150W WHICH HAS TS RIDGE
XTNDG INTO MOST OF THE REGION. LOW PRES 1008 MB 360 NM N OF THE
WTRS HAS A CLD FRNT STRCHNG S INTO THE NW PARTS OF THE WASH WTRS.
THERE IS A SERIES LOW PRES CNTRS ALONG AN INLAND TROF THAT
STRETCHES FROM SRN CA THRU NRN CAL INTO OREG AND WASH STATES. THE
PRES GRDNT IS SLCK AT THE MOM OVR THE REGION BUT IS BECOMING TIGHT
OVR THE CNTRL WTRS NR THE REGION WHERE THE TROF IS DEEPER. THE
OBSVD WINDS ARE HGHR OVR THE CNTRL WTRS REACHING 25 KT BUT THEY
RANGE BTWN 10 AND 20 KT ELSEWHERE. THE LAST R-SCAT PASS AT 1938Z
HAD NO WINDS ABOVE 20 KT OVR THE REGION.

AN UPPRLRVL RIDGE IS JUST E OF THE NRN WTRS WHILE A BROAD UPPRLVL
TROF LIES JUST W OF THE SRN WTRS WITH SOME LOCALLY INDCD ENRGY.
ANOTHER BUCH OF ENRGY IS EMBDD IN AN UPPRLVL TROF THAT XTNDS SE
FROM THE GULF OF AK THEN TURNS SW NR 50N140W. UPSTREAM ARE POCKETS
OF ENRGY IN A TROF OVR CNTRL PAC NR THE DATELINE BTWN 30N AND 65N.
IN THE HSORT TERM THE ENERGY IN THE GULF OF AK WILL DROP DOWN TO
RE ENFORCE THE ENERGY OVR THE CNTRL WTRS. AN UPRLVL RIDGE WILL
FORLLOW BEHIND THE TROF IN THE XTNDD PRD. AS SUCH THE PRES GRDNT
OVR THE REGION MUST BECOME TIGHTER AND WINDS WILL BE ELEVATED TO
GALE FORCE BUT SHUD REMAIN BELOW GALE FORCE IN THE XTNDD PRD.

THE 0000Z MDL RUN STILL SHOWS AGRMNT AMONG THE MDLS ON THE HGH
PRES AND THE INLAND TROF. MDLS HAV INTIALIZED WELL AND SEE NO NEED
TO DEVIATE FROM THE PREVIOUS FORECAST AND SO WILL STAY WITH GFS
FOR MOST OF THE FRCST PRD. IN THE SHORT TERM THE HGH PRES WILL
MOVE E AS IT BUILDS WHILE THE INLAND TROF WILL DEEPEN FARTHER AND
THAT WILL TIGHTEN THE PRES GRDNT OVR THE REGION TO GENERTATE GALE
FORCE WINDS. LOW PRES WILL THEN PASS N OF THE REGION AND FORCE THE
HGH PRES TO RETREAT SW AND THAT WILL RELAX THE PRES GRDNT RESULTNG
IN THE DIMINISHING OF GALE FORCE WINDS.

.SEAS...THE SEAS RANGE BTWN 8 AND 10 FT ACRS THE REGION WITH
RELTVLY HGHR SEAS OVR THE CNTRL WTRS. THE LAST JASON PASS AT 0220Z
HAD PEAK SEAS AT 10 FT OVR THE CNTRL WTRS. THE NWW3 MULTI GRID
FITS WELL WITH THE OBSVD SEAS PATTERN BUT IT HAS BEEN UNDERDONE BY
A FOOT OVR THE REGION. OTHERWISE NWW3 IS VERY CLOSE TO THE
ECMWFWAVE AND HAS BEEN QUITE CONSSTNT. THE SEAS WILL BUILD TO 20
FT OVR THE CNTRL WTRS WED THEN START TO SUBSIDE BUT WILL NOT FALL
BELOW 8 FT ELSEWHERE THRU THE REST OF THE XTNDD PRD.

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

.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
.PZZ800...INNER WATERS FROM CAPE FLATTERY TO CAPE SHOALWATER...
     GALE TONIGHT.
     GALE POSSIBLE SAT.
.PZZ815...INNER WATERS FROM FLORENCE OR TO POINT ST. GEORGE...
     GALE TODAY INTO TONIGHT.

.PZ6 CALIFORNIA WATERS...
.PZZ820...INNER WATERS FROM POINT ST. GEORGE TO POINT ARENA...
     GALE TODAY INTO WED NIGHT.
.PZZ920...OUTER WATERS FROM POINT ST. GEORGE TO POINT ARENA...
     GALE TONIGHT INTO WED NIGHT.
.PZZ825...INNER WATERS FROM POINT ARENA TO PIGEON POINT...
     GALE TONIGHT INTO WED NIGHT.
     GALE POSSIBLE THU.
.PZZ925...OUTER WATERS FROM POINT ARENA TO PIGEON POINT...
     GALE TONIGHT INTO WED NIGHT.
.PZZ830...INNER WATERS FROM PIGEON POINT TO POINT PIEDRAS BLANCAS...
     GALE TONIGHT INTO WED NIGHT.
.PZZ930...OUTER WATERS FROM PIGEON POINT TO POINT PIEDRAS BLANCAS...
     GALE TONIGHT INTO WED NIGHT.
.PZZ935...OUTER WATERS FROM POINT PIEDRAS BLANCAS TO SANTA CRUZ ISLAND, CA...
     GALE WED NIGHT.

$$

.FORECASTER MUSONDA. OCEAN PREDICTION CENTER.


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