Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 201422
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
722 AM PDT SUN APR 20 2014

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

12Z OPC SFC ANALYSIS SHOWS A WARM FRONT ACROSS THE NRN PZ5
WATERS...W/A COLD FRONT W OF THE REGION. A HIGH PRES RIDGE SITS
ACROSS THE PZ6 WATERS.

MADE SOME TWEAKS MAINLY TO THE INITIAL 2 PERIODS BUT OTHERWISE
LEFT MUCH OF THE CURRENT FORECAST AS IS IN THIS INTERMEDIATE
UPDATE. WILL CONTINUE W/GALE HEADLINES IN PARTS OF THE NRN PZ5
WATERS TODAY W/WINDS EASING TONIGHT AS THE COLD FRONT SLIDES E OF
THE AREA. CONCERNING THE NEXT PERIOD OF GALES LATE WED IN THE PZ5
WATERS...WILL CONTINUE W/THOSE FOR NOW BUT RE-EVALUATE THE
PROBABILITY OF THAT ONCE 12Z GUIDANCE HAS ARRIVED.

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

THE SAT IMG INDCT NO COMNV CLDS OVR THE REGION BUT CLDS ASSCTD
WITH A FRNTL BNDRY APPROACHING FROM THE W. THE RADAR HAS NO INDC
OF TSMS OVR THE REGION. AT 20/0600Z A WKNG CLD FRNT LIES ACRS THE
FAR SRN WTRS. HGH PRES 1026 MB CNTRD OVR THE WRN EDGE OF THE CNTRL
CAL WTRS HAS A WK RIDGE XTNDG NE ACRS THE CNTRL REGION AND ANOTHER
RIDGE XTNDG SE PASSING JUST W OF THE SRN REGION. AN AREA OF LOW
PRES SYSMS STRTCHES FROM THE GULF OF AK WITH ONE LOW PRES 988 MB
CNTRD NR 45N145W. THE PRES GRDNT IS FAIRLY SLACK OVR MOST OF THE
REGION XCEPT THE NRN WTRS WHERE THE MAX OBS WINDS ARE 30 KT. THE
LATST ASCAT PASS AT 0450Z HAD 30 KT WINDS OVR THE NW WTRS AND HAD
10 KT WINDS OVR THE SRN WTRS.

SEAS...THE HGHST SEAS ARE STILL CONFINED TO THE NW REGION WITH
27-FT PEAKS WHILE THE LOWEST SEAS ARE STILL 6 FT OVR THE SRN WTRS.
THE NWW3 MULTI-GRID CONTINUES TO FIT VERY WELL WITH THE OBSVD SEAS
PATTERN AND HAS BEEN QUITE CONSSTNT AND EVEN IN AREAS WITH HGH
WINDS AND SEAS AND IS IN A GUD AGRMNT WITH THE ECMWFWAVE AND SO NO
NEED TO DEVIATE FROM IT EVEN FOR THIS FCST PCKGE.

THE GLBL MDLS HV EQUALLY CONTINUED TO INITILAIZE WELL AND THEY ARE
IN SOME DECENT AGRMNT ESPCLLY IN THE SHORT TERM AND SO WILL STAY
WITH GFS FOR THIS PCKGE. IN THE SHORT TERM THE HGH PRES W OF THE
REGION WILL REMAIN NRLY STNRY BUT WILL DSIPT MON ALLOWING THE
FRNTL SYS TO PENETRATE FARTHER S ACRS THE REGION. THE PRES GRDNT
WILL REMAIN SLACK OVR THE SRN WTRS WHILE IT WILL BRIEFLY TIGHTEN
OVR THE FAR NRN WTRS AND ALLOW GALE FORCE WINDS TO BRIEFLY IMPACT
THE WASH WTRS. IN THE XTNDD PRD THE PRES GRDNT WILL SLACKEN OVR
THE NRN WTRS BUT WILL BECOME TIGHT AS INLAND LOW PRES DEEPENS AND
THAT WILL ELEVATE WINDS OVR SMALL AREA OF THE ERN PARTS OF THE SRN
WTRS...THEN AGAIN OVR THE NRN WTRS LATE IN THE XTDD PRD.


.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 WED NIGHT.
.PZZ900...OUTER WATERS FROM CAPE FLATTERY TO CAPE SHOALWATER...
     GALE TODAY.
     GALE POSSIBLE WED NIGHT.

.PZ6 CALIFORNIA WATERS...
.PZZ840...INNER WATERS FROM SANTA CRUZ ISLAND, CA TO SAN CLEMENTE ISLAND, CA...
     GALE POSSIBLE TUE INTO TUE NIGHT.

$$

.FORECASTER HOLLEY/MUSONDA. OCEAN PREDICTION CENTER.


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