Marine Interpretation Message
Issued by NWS

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000
AGPN40 KWNM 281422
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
622 AM PST SUN DEC 28 2014

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

INLAND LOW PRES CURRENTLY COMBINING WITH HIGH PRES NW OF THE PZ5
WATERS TO PRODUCE NW WINDS UP TO 35 KT ACROSS PORTIONS OF THE
WASHINGTON OFFSHORE WATERS. WINDS ACROSS THE NRN PZ5 WATERS ARE
STILL EXPECTED TO SLOWLY DIMINISH TODAY AND TONIGHT. THE LATEST
MODEL GUIDANCE CONTINUES TO DEVELOP A LOW PRES TROF ALONG THE W
COAST OF THE U.S. BY MON NIGHT WITH NRLY GALES DEVELOPING ACROSS
THE SRN PZ5/NRN PZ6 WATERS BY LATE MON NIGHT. THESE GALES WILL
THEN CONTINUE INTO TUE. GALES ARE ALSO POSSIBLE FARTHER S ACROSS
THE CENTRAL PZ6 WATERS BY LATE TUE BUT FOR NOW WILL HOLD THE WINDS
THERE AT 30 KT. MAINLY LIGHT WINDS WILL THEN DEVELOP ACROSS MOST
OF THE PZ6 WATERS BY FRI. FARTHER N...LOW PRES IS STILL EXPECTED
TO DEVELOP NEAR VANCOUVER ISLAND BY FRI WITH WINDS UP TO 30 KT
ACROSS PORTIONS OF THE WASHINGTON OFFSHORE WATERS. CURRENT
WARNINGS LOOK REASONABLE AND FEW CHANGES SHOULD BE NEEDED ON THE
NEXT OFFSHORE FORECAST.

THE WAVEWATCH LOOKS REASONABLE WITH THE SEAS AND WILL BE FOLLOWED
FAIRLY CLOSELY DURING THE FORECAST PERIOD.

EXTRATROPICAL STORM SURGE GUIDANCE...N/A.

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

THE 06Z SFC ANALYSIS INDICATED A WEAKENING COLD FRONT OVER THE
OREGON WATERS WITH A HIGH PRES RIDGE EXTENDING FROM GULF OF AK SE
ACROSS THE CA WATERS. AN ASCAT PASS FROM 0440Z INDICATED A LARGE
AREA OF 30 KT WINDS EXTENDING FROM THE WASHINGTON OFFSHORE WATERS
NW TO THE QUEEN CHARLOTTE ISLANDS.

THE 00Z MODELS CONTINUE TO BE IN VERY GOOD AGREEMENT THROUGH THE
FCST PERIOD. HIGH PRES RIDGE WILL PERSIST THROUGH THE
PERIOD...WHILE A COASTAL TROUGH FORMS OVER THE N CA AND OREGON
COAST MON NIGHT THEN STRENGTHENS TUE INTO TUE NIGHT BEFORE
WEAKENING WED AND WED NIGHT. WILL USE THE GFS 30M WINDS THROUGH
THE FCST PERIOD...WITH WINDS STILL EXPECTED TO REACH GALE LATE MON
NIGHT INTO TUE NIGHT OVER THE S OREGON AND N CA WATERS. WILL ALSO
MAINTAIN GALES FOR WA INNER WATERS FOR EARLY THIS MORNING.

.SEAS...THE 06Z SEA STATE ANALYSIS INDICATED THAT OBSERVED SEAS
WERE WITHIN A FT OF THE MWW3 FCST VALUES. WILL USE THE MWW3 TO
POPULATE GRIDS THROUGH 21Z MON...THEN WILL USE A 70/30 ECMWF/MWW3
BLEND FOR THE REMAINDER OF PERIOD TO GIVE HIGHER WEIGHT TO ECMWF
WHICH HAS HIGHER SEAS WHICH SEEMS MORE REASONABLE GIVEN THE
EXPECTED WINDS.

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


.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
.PZZ800...INNER WATERS FROM CAPE FLATTERY TO CAPE SHOALWATER...
     GALE EARLY TODAY.
.PZZ815...INNER WATERS FROM FLORENCE OR TO POINT ST. GEORGE...
     GALE POSSIBLE MON NIGHT INTO TUE NIGHT.
.PZZ915...OUTER WATERS FROM FLORENCE OR TO POINT ST. GEORGE...
     GALE POSSIBLE TUE.

.PZ6 CALIFORNIA WATERS...
.PZZ820...INNER WATERS FROM POINT ST. GEORGE TO POINT ARENA...
     GALE POSSIBLE MON NIGHT INTO TUE.
.PZZ920...OUTER WATERS FROM POINT ST. GEORGE TO POINT ARENA...
     GALE POSSIBLE TUE.

$$

.FORECASTER NOLT/KOSIER. OCEAN PREDICTION CENTER.



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