Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 291519
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
719 AM PST MON DEC 29 2014

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

THE IR SAT IMG INDCT MOST OF THE CONV IS W OF THE REGION AND
THERE IS NO LIGHTNG OVR THE REGION. THE RADAR HAS NO INDCT OF ANY
TSTMS CELLS OVR THE REGION. AT 1200Z HGH PRES CNTRD OVR CANADA DUE
NO OF THE WTRS XTNDS A RIDGE ACRS THE WRN PARTS OF THE REGION. A
VERY WK CLD FRNT STRTCHES FROM AN INLAND LOW PRES OVR OREG ACRS
THE N-ERN PARTS OF THE WASH WTRS. THE PRES GRDNT IS QUITE SLACK
AND THE MAX OBSVD WINDS ARE 25 KT OVR THE FAR NRN WRTRS. THE LAST
R-SCAT PASS WAS THE ONE DISCRIBED BELOW IN THE PREVIOUS DISCUSSION
SECTION. THE HGST SEAS ARE 12 FT OVR THE RN WTRS AND ELSEWHERE
THEY RANGE BTWN 5 AND 11 FT WITH LOWEST SEAS OVR THE SRN WTRS.

THE GLBL MDLS HV INITILAIZED WELL AND THEY CONTINUE TO BE IN GUD
AGRMNT. NO NEED TO DEVIATE FROM THE PREVOUS FORECAST AND SO WILL
STAY WITH GFS. IN THE SHORT TERM THE HGH PRES RIDGE WILL PERSIST W
OF THE REGION AND CONTINUE TO BLOCK FRNTL SYSMS FROM REACHING THE
WTRS. BUT UPRLVL FEATURES STILL SUGGEST THAT ENRGY WILL DROP FROM
THE N TO INLAND CA AND THAT WILL FORCE A TIGHTER PRES GRDNT ABOUT
WED TO GENERATE GALE FORCE WINDS OVR THE ERN PARTS OF THE CNTRL CA
WTRS. WILL THERFORE RETAIN THE BRIEF PRD OF GALES OVR THE CNTRL
WTRS.

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

THE 06Z SFC ANALYSIS INDICATED A WEAK HIGH PRES RIDGE EXTENDING
ACROSS THE OFFSHORE WATERS...WITH A TROUGH ALONG THE CENTRAL CA
COAST. AN ASCAT PASS FROM LATE SUN EVENING INDICATED THE STRONGEST
WINDS WERE OVER THE WASHINGTON OFFSHORE WATERS RANGING FROM 20 TO
30 KT. WINDS OVER THE REMAINDER OF THE AREA WERE MOSTLY IN THE 10
TO 20 KT RANGE.

THE 00Z MODELS ARE IN DECENT AGREEMENT THROUGH THE FCST PERIOD.
HIGH PRES RIDGE WILL PERSIST OVER THE E PAC WHICH WILL KEEP
SIGNIFICANT SYSTEMS W AND NW OF THE AREA THROUGH THE WEEK. THE
MODELS STILL INDICATE COASTAL TROUGH WILL STRENGTHEN THROUGH
MIDWEEK BEFORE WEAKENING LATER IN THE WEEK. ALL OF THE MODELS HAVE
BACKED OFF ON THE WINDS OVER THE OREGON AND N CA WATERS MON NIGHT
AND TUE...AND NOW KEEP WINDS JUST BELOW GALE THRESHOLD. THE FOCUS
NOW SEEMS TO BE THE CENTRAL CA WATERS TUE NIGHT INTO EARLY
WED...AND THE SE OREGON AND N CA WATERS WED NIGHT. WILL CONTINUE
WITH THE WARNING HEADLINES FOR THESE AREAS...THOUGH CONFDC IS LOW
TO MDT AS IT LOOKS LIKE THIS WILL BE MARGINAL AND BRIEF EVENT. THE
TROUGH WILL WEAKEN THU NIGHT AND FRI WITH LIGHT WINDS EXPECTED
OVER ALL THE AREA THU NIGHT THROUGH FRI NIGHT. WILL POPULATE GRIDS
USING THE GFS 30M WINDS THROUGH THE PERIOD.

.SEAS...THE 06Z SEA STATE ANALYSIS INDICATED THAT OBSERVED SEAS
WERE WITHIN A FT OF THE MWW3 FCST VALUES. WILL POPULATE GRIDS
USING THE MWW3 THROUGH THE PERIOD.

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


.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
     NONE.

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

$$

.FORECASTER MUSONDA/KOSIER. OCEAN PREDICTION CENTER.


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