Marine Interpretation Message
Issued by NWS

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000
AGPN40 KWNM 291430
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
730 AM PDT FRI MAY 29 2015

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

A HIGH PRES RIDGE CURRENTLY W OF THE OFFSHORE WATERS CONTINUES TO
COMBINE WITH INLAND LOW PRES TO PRODUCE N TO NW WINDS ACROSS MOST
OF THE OFFSHORE WATERS. THE HIGHEST CONDITIONS ARE CURRENTLY W OF
POINT CONCEPTION AND ALSO W OF THE WASHINGTON COAST WITH WINDS AS
HIGH AS 20 OR 25 KT. CONDITIONS ARE EXPECTED TO CONTINUE TO
DIMINISH WITH MAINLY LIGHT WINDS EXPECTED ACROSS MOST OF THE
OFFSHORE WATERS BY SAT.

WEAK LOW PRES IS STILL EXPECTED TO MOVE INTO THE NRN PZ6 WATERS
BY SUN NIGHT AND THEN DISSIPATE BY LATE MON. BY TUE NIGHT THE NW
FLOW WILL BEGIN TO INCREASE OFF THE COAST OF CALIFORNIA WITH THE
HIGHEST WINDS OF 25 OR 30 KT EXPECTED W OF POINT CONCEPTION AND W
OF POINT ARENA. BY LATE WED THE STRONGEST WINDS WILL STILL BE W OF
POINT ARENA WITH SPEEDS UP TO 30 KT. FOR WIND GRIDS WILL CONTINUE
TO USE THE GFS 10M WINDS THROUGHOUT. CURRENT FORECAST LOOKS
REASONABLE AND WILL CONTINUE TO CARRY NO WARNINGS ACROSS THE
OFFSHORE WATERS DURING THE FORECAST PERIOD.

SEAS...CONDITIONS WILL CONTINUE TO SLOWLY SUBSIDE TODAY AND
TONIGHT WITH SEAS GENERALLY LESS THAN 6 FT ACROSS THE OFFSHORE
WATERS BY LATE SAT. BY WED NIGHT SEAS WILL AGAIN BUILD TO NEAR 12
FT ACROSS PORTIONS OF THE PZ6 WATERS AS THE NW WINDS INCREASE AND
SWELL FROM A TROPICAL SYSTEM S OF THE AREA MOVES N. FOR WAVE GRIDS
WILL CONTINUE TO USE THE NWW3.

EXTRATROPICAL STORM SURGE GUIDANCE...N/A.

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

THE 06Z SFC ANALYSIS INDICATED A HIGH PRES RIDGE EXTENDING FROM
GULF OF AK SE TO THE FAR WRN PORTION OF OFFSHORE WATERS. AN ASCAT
PASS FROM LATE THU EVENING INDICATED WINDS AROUND 20 KT OVER THE
ERN PORTION OF THE N/CENTRAL CA WATERS AND OVER THE WA WATERS.
OTHERWISE...WINDS WERE LESS THAN 20 KT.

THE 00Z MODELS CONTINUE TO BE IN DECENT AGREEMENT DURING THE
UPCOMING FCST PERIOD. THE MOST SIGNIFICANT FEATURE TO AFFECT THE
AREA WILL BE A WEAK LOW PRES WHICH IS FCST TO PASS ACROSS THE NRN
CA WATERS SUN NIGHT BEFORE DISSIPATING EARLY MON. OTHERWISE...HIGH
HIGH PRES RIDGE WILL DOMINATE TODAY INTO SAT BEFORE WEAKENING SAT
NIGHT...THEN REBUILD AGAIN LATER MON INTO TUE. IT LOOKS LIKE
TROUGH WILL STRENGTHEN ALONG THE CENTRAL CA COAST BY NEXT
TUE...AND ESPECIALLY TUE NIGHT...HOWEVER WINDS WILL CONTINUE TO
REMAIN BELOW GALE. WILL POPULATE WIND GRIDS USING THE 10M GFS
WINDS THROUGH TUE NIGHT AND BEYOND.

.SEAS...THE 06Z SEA STATE ANALYSIS INDICATED THAT OBSERVED SEAS
CONTINUE TO MATCH UP WELL WITH THE MWW3 FCST VALUES. WILL POPULATE
GRIDS USING THE 00Z MWW3 THROUGH THE PERIOD. BY LATER SUN EXPECT
SLIGHTLY HIGHER SEAS OVER CENTRAL/S CA WATERS AS S TO SW SWELL
FROM TROPICAL STORM ANDRES CURRENTLY WELL S OF AREA EXPANDS N.

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


.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
     NONE.

.PZ6 CALIFORNIA WATERS...
     NONE.

$$

.FORECASTER NOLT/KOSIER. OCEAN PREDICTION CENTER.


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