Marine Interpretation Message
Issued by NWS

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371
AGPN40 KWNM 300944
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
244 AM PDT SAT JUL 30 2016

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

THE LATEST HIGH RES ASCAT-A AND RAPIDSCAT IMAGERY BETWEEN 0430Z
AND 07Z SHOW GALES OFF SRN OREGON AND NRN CA COAST EVEN EXTENDING
OUT INTO SE PORTION OF SRN OUTER OREGON ZONE AND NRN CA OUTER
WTRS...MOSTLY MRGL GALES IN THE ENHANCED GRADIENT BETWEEN THE
INLAND THERMAL TROF AND THE STRONG HIGH TO THE W NR 43N145W.
ANOTHER AREA OF STRONGER GALES APPEARS OVR NRNMOST TWO ZONES WITH
STRONGEST 45 KT IN N PORTION OF PZZ800. A LOW PRES TROF HAS FORMED
OVR VANCOUVER ISL IN RESPONSE TO UPR SHRTWV TROF PASSING TO THE N
FOLLOWED BY SHRTWV RIDGING TO THE W CAUSING HIGH PRES TO BUILD FM
THE W. RECEIVED TWO SHIP RPTS WITH 45 KT IN THAT AREA AT 06Z. FOR
THE NEW FCST GRIDS...POPULATED WINDS WITH STRONGER 00Z GFS 30M
WINDS TO MORE CLOSELY MATCH OBS WITH SOME MINOR EDITS AT START OF
FIRST PRD. WINDS ARE LIGHTER AT NW 10 TO 20 KT OVR SRN HALF OF CA
WTRS CLOSER TO THE INVERTED TROF OVR CA.

LATEST 00Z MDLS SPRT MAINTAINING NLY GALES INTO SAT NIGHT BOTH FM
DIURNAL EFFCTS AND RDG BLDG FM W WITH EXTENSION OF GALES INTO ADJ
OUTER ZONES AT LEAST FOR FIRST PRD. CONT TO HAVE HIGHEST CONFDC
IN GALES FOR INNER ZONES OFF CA AND SRN OREGON WITH THE GALES IN
NRNMOST TWO ZONES PRESENTLY NR THEIR MAX. AN UPR CLOSED LOW IS
FCST BY MDLS TO APCH NRN WTRS FM WNW SAT NIGHT INTO SUN NIGHT
WHICH WILL WKN THE OFSHR HIGH PRES RDG FIRST IN THE NRN WTRS SAT
NIGHT...ENDING THE GALES THERE...AND THEN THE CENTRAL PORTIONS
INCUDING OREGON AND NRN CA SUN AND SUN NIGHT. UPR AND SFC RDG
REBUILD EWD AFTER UPR LOW MOVS INLAND MON NIGHT INTO TUE. THIS WL
LKLY INCREASE GRADIENT ENUF TO REDVLP NLY GALES AT LEAST OVR NRN
CA INNER WTRS TUE NIGHT INTO WED NIGHT. AFTER FIRST PRD POPULATED
RMNDR OF WIND GRIDS WITH REPRESENTATIVE 00Z GFS WITH OTHER
GUIDANCE ESPCLY ECMWF IN GOOD AGRMT. USED OTRW A 50/50 BLEND OF
00Z GFS 10M AND 30M WINDS. THE GFS AND OTHER GLOBAL MDLS HAVE
CHANGED LTL FM EARLER RECENT RUNS...SO THERE IS LTLCHG IN WRNGS.

.SEAS...POPULATED SEAS WITH THE MORE REPRESENTATIVE 00Z ECMWF WAM
WHICH IS INITIALIZED WITH HIGHER SEAS THAN 00Z ENP WW3...AND FACT
BOOSTED SEAS BY 10 PCT TO MORE CLOSELY MATCH THE OBS. USED 00Z
ECMWF THRU SUN AND THEN AFTER THAT USED A 50/50 BLEND OF THE 00Z
WAVE MDLS AS THE MDLS AFTER SUN ONLY SHOW MINOR DIFFERENCES OF A
FOOT OR SO.

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

.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
.PZZ800...INNER WATERS FROM CAPE FLATTERY TO CAPE SHOALWATER...
     GALE TODAY INTO TONIGHT.
.PZZ900...OUTER WATERS FROM CAPE FLATTERY TO CAPE SHOALWATER...
     GALE TODAY.
.PZZ815...INNER WATERS FROM FLORENCE OR TO POINT ST. GEORGE...
     GALE TODAY INTO SUN.

.PZ6 CALIFORNIA WATERS...
.PZZ820...INNER WATERS FROM POINT ST. GEORGE TO POINT ARENA...
     GALE TODAY INTO SUN NIGHT.
     GALE POSSIBLE TUE NIGHT INTO WED NIGHT.
.PZZ920...OUTER WATERS FROM POINT ST. GEORGE TO POINT ARENA...
     GALE TODAY INTO TONIGHT.

$$

.FORECASTER BANCROFT. OCEAN PREDICTION CENTER.



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