Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 281450
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
750 AM PDT SAT MAY 28 2016

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

THE 12Z OPC SFC ANALYSIS INDICATES A STRONG PRES GRADIENT PERSISTS
BETWEEN AN INLAND TROUGH OVER CA AND A 1027 MB HIGH W OF THE PZ6
WATERS. ADDITIONALLY...A 1014 MB LOW IS LOCATED NEAR VANCOUVER
ISLAND WITH ITS ASSOCIATED WEAK COLD FRONT EXTENDING ACROSS THE
NRN PZ5 WATERS.

ONLY MINOR CHANGES WERE MADE TO THE NEAR TERM FORECAST WITH THIS
UPDATE. A BLEND OF THE 30/10M GFS WINDS WAS USED TO MAINTAIN
20-30 KT WINDS OVER THE NRN PZ6 WATERS THROUGH TODAY. THE 06Z
GFS/ECMWF AGREE THAT THE SWATH OF STRONGEST NLY WINDS WILL REMAIN
JUST E OF THE INNER PZ6 WATERS THROUGH TONIGHT. THEREFORE WILL
KEEP WINDS JUST BELOW GALE FORCE TODAY OVER THE NRN CA WATERS.
ELSEWHERE THE PREVIOUS FORECAST REMAINS ON TRACK.

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

THE SAT IMG STILL SHOWS SOME CLOUDS APPROACHING THE NRN WATERS.
MOST OF THE CENTRAL AND SOUTHERN WATERS STILL HAVE FEW CLOUDS AND
THERE IS STILL NO LIGHTNING ASSOCIATED WITH THEM OVER THE FORECAST
REGION. THE RADAR HAS CONTINUES WITH NO SIGN OF TSTMS OVER THE
REGION AND THE SREF MODEL ALSO HAS LESS THAT 5 PERCENT CHANCE OF
SEV TSTMS OVER THE WATERS. AT 06Z COMLEX HIGH PRESSURE WITH MAIN
CENTER 1030 MB NEAR 38N140W HAS ITS RIDGE STILL EXTENDING E INTO
MOST OF THE REGION. AN INLAND LOW PRESSURE NOW 1003 MB OVER SRN CA
HAS ITS TROF STILL STRETCHING NW ACROSS CA STATE AND THAT HAS
COMBINED WITH THE HIGH PRES TO FORCE A TIGHT PRESSURE GRADIENT
OVER THE ERN PARTS OF THE CENTRAL WATERS WHERE THE WINDS ARE IN
THE GALE FORCE RANGE. LOW PRES 1018 MB ABOUT 240 NM NW OF THE WA
WATERS HAS A WARM FRONT EXTENDING SE THAT IS JUST W OF THE WA
WATERS.

AN UPPER LEVEL RIDGE IS APPARENT ALONG 140W WHILE AN UPPER LEVEL
RIDGE WITH SOME SIG ENERGY IS NOW INLAND JUST E OF THE WATERS. THE
UPPERLEVRL RIDGE WILL SHIFT E AND BE OVER THE ENTIRE REGION FROR A
WHILE AND THAT WILL FORCE THE PRES GRADIENT OVR THE ERN PARTS TO
RELAX AND ALLOW WINDS TO DIMINISH TO BELOW GALE FORCE BY SAT
AFTERNOON. THE GLOBAL MODELS HAVE INITIALIZED WELL AND THEY ARE IN
DECENT AGREEMENT IN THE SHORT TERM ON RELAXING THE PRES GRADIENT
OVER THE CENTARL WATERS. EVERN IN THE EXTENDED PERIOD THE MODELS
AGREE WELL ON KEEPING THE HIGH PRES OVER THE REGION. SO WILL
CONTINUE WITH GFS.

.SEAS...THE SEAS ARE EQUALLY LOW IN MOST AREAS LESS THAN 6 FT BUT
THEY PEAK AT 13 FT OVER THE ERN PARTS OF THE CENTRAL WATERS. THE
NWW3 MULTI GRID WAVE MODEL FITS VERY WELL WITH THE OBSERVED SEAS
PATTERN AND IS VERY CLOSE TO THE ECMWFWAVE MODEL.


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



.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
     NONE.

.PZ6 CALIFORNIA WATERS...
     NONE.

$$

.FORECASTER REINHART/MUSONDA. OCEAN PREDICTION CENTER.



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