Marine Interpretation Message
Issued by NWS

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000
AGPN40 KWNM 230336
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
836 PM PDT FRI MAY 22 2015

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

THE SAT IMG INDCT MOSTLY CLDY BUT NOT ASCCTD WITH ANY LIGHTNG
STRIKES OVR THE REGION. THE RADAR ALSO HAS NO TSTMS CELLS ACRS THE
FCST WTRS. AT 0000Z ORIENTED N TO S HGH PRES WITH FIRST CNTR 1026
MB NR 55N140W AND SECOND CNTR 1028 MB 300 NM W OF THE OREG WTRS
STNDS A RIDGE S THAT CURVES SE TO PASS JUST W OF THE SRN WTRS.
INLAND LOW PRES 1006 MB OVR SRN NV HAS TROF XTNDG N INTO NV AN S
INTO AZ. ANOTHER INLAND LOW OVR THE NRN TIP OF WAS HAS SHORT TROF
XTNDG SW AND ANOTHER NW. UPSTREAM IS A FRNTL SYSTM WITH LOW PRES
1007 MB CNTRD 720 NM NE OF THE HAWAIIAN ISLANDS WITH ITS QSTNRY
FRNT STYRTCHNG N INTO JUST SE OF THE ALEUTIAN ISLANDS. THE PRES
GRDNT IS SLCK AND OBSVD WINDS ARE ONLY 20 KT. THE SEAS RANGE BTWN
6 AND 9 FT OVR THE NRN WTRS AND BTWN 3 AND 6 FT OVR THE SRN WTRS.

THE GLB MDLS HV CONTIONUED TO INITIALIZE WELL AND THEY ARE STILL
IN GUD AGRMNT OVR THE HGH PRES AND THE INLAND TROF THRU THRE FRCST
PRD. SO WILL CONTINUE WITH GFS. IN THE SHORT TERM HGH PRES WILL
PERSIST TO THE W AND WILL BLOCK THE FRNTL SYSTMS FROM RAECHING THE
WTRS. BUT AS HGH PRES WEAKENS IN THE XTNDD PRD A FRNTL SYSYTM WILL
APPROACH THE REGION.

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

THERE ARE ENHANCED NWLY WINDS OVR THE WA WTRS AND TO THE NW
BETWEEN THE HIGH PRES RDG W OF THE AREA AND A INLAND TROF THAT
XTNDS NW ACRS INLAND COASTAL AREAS OF BRITISH COLUMBIA. STILL HAV
NOT HAV NOT SEEN ANY RECENT OBS OVR THE WA WTRS NOR ASCAT DATA OVR
THIS REGION. THE STGST OBS WINDS JUST N OF THE AREA WERE TO 20 KT
FM BUOYS. THIS FITS WELL TO 30M GFS WINDS WHICH IS SLGTLY WKR WITH
WINDS THAN 06Z MDL GUID. ELSW OVR THE OFFSHR WTRS WINDS WERE TO 20
KT FM THE NRN CA WTRS AND NWD AND OVR THE SRN CA WTRS OVR THE ERN
AREAS. HIGH PRES RDG CNTRD TO THE W OF THE OFFSHR WTRS STRENGTHENS
TNGT THRU EARLY SUN WHILE GRADUALLY DRIFTING EWD...THEN BECOMS WKR
SUN INTO MON. A COASTAL TROF DVLPS ALG THE NRN AND CNTRL CA LATER
TNGT INTO SAT...THEN PERSISTS INTO MON AND TUE. THE GFS/ECMWF ARE
SMLR WITH THE AREA OF HIGH PRES STRENGTHENING OVR THE NRN AREAS OF
THE GLF OF AK MON NGT INTO WED. WL FAVOR THE GFS MDL THRU THE
FCST PD AND USE 30M WINDS FM LATE SAT MRNG INTO SAT NGT.

SEAS...THE MULTIGRID WWIII AND ECMWF WAM COMPARE WELL TO OBS SEAS
OVR THE WTRS AT 18Z AND THIS CONTS THRU MUCH OF THE FCST PD. THE
EXCEPTION OCCURS BY TUE NGT WHERE THE ECMWF WAM IS SVRL FT HIGHER
THAN THE WWIII. PLAN TO USE A 50/50 BLEND AND THEN TRANSITION TO
ECMWF WAM TUE NGT THRU WED NGT.

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


.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
     NONE.

.PZ6 CALIFORNIA WATERS...
     NONE.

$$

.FORECASTER MUSONDA/ROWLAND. OCEAN PREDICTION CENTER.



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