Marine Interpretation Message
Issued by NWS

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AGPN40 KWNM 311445
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
745 AM PDT FRI JUL 31 2015

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

HIGH PRES CURRENTLY CENTERED W OF THE PZ5 WATERS CONTINUES TO
COMBINE WITH WEAK LOW PRES NEAR THE COAST OF NRN CALIFORNIA TO
PRODUCE N TO NE WINDS ACROSS THE SRN PZ5 AND NRN PZ6 WATERS WITH
WINDS AS HIGH AS 20 OR 25 KT. BY TONIGHT NRLY WINDS WILL INCREASE
TO 25 OR 30 KT ACROSS ERN PORTIONS OF THE PZ5 WATERS AND THEN
CONTINUE INTO SAT NIGHT. THESE WINDS WILL THEN DIMINISH BY SUN.
FARTHER S...NW WINDS WILL INCREASE TO 25 KT OR SO OFF THE COAST OF
SRN CALIFORNIA BY SUN NIGHT AS INLAND LOW PRES OVER THE SW U.S.
STRENGTHENS. THESE WINDS WILL THEN CONTINUE INTO TUE NIGHT. THE
STRONGEST WINDS WILL THEN SHIFT N TO THE AREA W OF CAPE MENDOCINO
BY WED NIGHT. MEANWHILE...WEAK LOW PRES W OF THE PZ6 WATERS WILL
REMAIN NEARLY STATIONARY AND THEN DISSIPATE BY MON NIGHT. CURRENT
FORECAST LOOKS REASONABLE AND WILL CONTINUE TO CARRY NO WARNINGS
ACROSS THE OFFSHORE WATERS DURING THE FORECAST PERIOD.

THE ENP VERSION OF THE NWW3 LOOKS REASONABLE WITH THE SEAS AND
WILL CONTINUE TO FOLLOW IT FAIRLY CLOSELY DURING THE FORECAST
PERIOD.

EXTRATROPICAL STORM SURGE GUIDANCE...N/A.

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

THE IR SAT IMG STILL HAS MOSTLY CLR SKIES OVR THE NRN HALF OF THE
FCST WTRS WITH THIN CLDS OVR THE REST AND NO LIGHTNG ACRS THE
REGION OR EVEN THE ADJ COASTAL AREAS. THE RADAR CONTINUES TO SHOW
NO INDC OF TSTMS CELLS OVR THE REGION. AT 31/06Z HGH PRES 1026 MB
STILL JUST W OF THE REGION HAS ITS RIDGE STILL ACRS THE NRN WTRS
WITH ANOTHER RIDGE XTNDG SE ACRS THE SRN WTRS. INLAND LOW PRES
TROF CONNECTS THE LOWS ALONG THE COASTS FROM SRN CA INTO OREG. THE
PRES GRDNT IS FAIRLY SLACK AND THE MAX OBS WINDS ARE 25 KT MAINLY OVR
THE CNTRL WTRS.

THERE IS STILL NO MJR ENRGY OVR THE REGION TO STRENGTHEN THE
SYNOP SYSTMS. THERE IS SOME LOCALLY INDCD ENRGY JUST SW OF THE
REGION EMBDD IN AN UPPRLVL TROF THAT IS BLOCKED FROM ADVNCG E BY
AN UPPRLRVL RIDGE THAT LIES ACRS THE REGION. SOME ERNGY WIL
APPROACH THE NRN WTRS AT THE END OF FRCST PRD AND THAT WILL
TIGHTEN THE PRES GRDNT BUT WILL BE JUST AFTER THE END OF FCST PRD.

THE GLBL MDLS HV AGREED WELL ON THE FEW SYNOP FEATURES ESPCLY IN
THE SHORT TERM. JUST MNR DIFFS IN THE XTNDD PRD MAINLY IN THE
STRENGTH OF THE INLAND TROF. BUT GENERALLY THE WINDS WILL STILL
REMAIN BELOW GALE FORCE EVEN THOUGH THEY WILL INCREASE TWD END OF
FRCST PRD. IN THE SHORT TERM THE HGH PRES WILL REMAIN ANCHORED TO
THE W OF THE REGION AS INLAND TROF WEAKENS FARTHER. IN THE XTNDD
PRD THE INLAND TROF WILL STRENGTHEN AS HGH REBUILDS TO THE W AND
THAT WILL FORCE THE PRES GRDNT TO SLIGHTLY BECOME TIGHT BUT WINDS
WILL REMAIN BELOW GALE FROCE THRESHOLD.

.SEAS...THE SEAS ARE HGHST WITH 10 FT PEAK OVR THE CNTRL WTRS
WHILE THEY RANGE BTWN 3 AND 6 FT OVR THE FAR NRN AND SRN REGIONS.
THE NWW3 MULTI GRID FITS VERY WELL WITH THE OBSVD SEAS PATTERN AND
IS IN VERY CLOSE TO THE EAURO WV MDL.

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


.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
     NONE.

.PZ6 CALIFORNIA WATERS...
     NONE.

$$

.FORECASTER NOLT/MUSONDA. OCEAN PREDICTION CENTER.



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