Marine Interpretation Message
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
AGPN40 KWNM 290321
MIMPAC

MARINE WEATHER DISCUSSION FOR N PACIFIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
721 PM PST WED JAN 28 2015

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

THE IR SAT IMG HAS AT 00Z HGH PRES RIDGE XTNDS FROM INLAND HGH
PRES 1039 MB OVR CANADA ACRS THE WTRS. ANOTHER SECONDARY HGH PRES
1026 MB IS 120 NM W OF THE REGION ALONG 40N. THE PRES GRDNT IS
VERY SLACK AND THE MAX OBS WINDS ARE ONLY 15 KT. THE LAST ASCAT
PASS AT 1835Z NO WINDS TO 15 KT OVR MOST OF THE REGION EXCEPT THE
FAR NW PARTS TO 20 KT. THE OBSVD SEAS RANGE BETWN 3 AND 6 FT ACRS
THE REGION AND THE NWW3 MULTI GRID WV MDL FITS WELL WITH THE SEAS
PATTERN. THE GLB MDLS HV ASLO INITAILIZED WELL AND THEY ARE IN GUD
GRMNT. WILL CONTNUE WITH GFS. IN THE SHORT TERM HGH PRES TO THE W
OF THE REGION WILL SHIFT S BUT THE RIDGE ACRS THE REGION WILL
STILL BE MAINTAINED AND WINDS WILL REMAIN BELOW GALE FORCE THR THE
FSCT PRD.

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

THE 18Z SFC ANALYSIS INDICATED A WEAK LOW PRES OVER SW CA WITH
WEAK HIGH PRES RIDGE EXTENDING ACROSS THE OFFSHORE WATERS. AN
ASCAT PASS FROM AROUND 1800Z INDICATED WINDS 20 KT OR LESS OVER
THE OFFSHORE AND COASTAL WATERS.

THE 12Z MODELS ARE IN VERY GOOD AGREEMENT THROUGH THE ENTIRE FCST
PERIOD. THE GFS HAS BACKED OFF ON THE LOW FCST TO PASS NW OF THE
WA/OR WATERS SUN AND IS NOW CLOSER TO THE OTHER 12Z GLOBAL MODELS.
FOR TONIGHT THROUGH SAT...HIGH PRES RIDGE WILL PERSIST ACROSS THE
AREA WHILE TROUGH BUILDS ALONG THE CA COAST AND TO THE FAR SRN
OREGON COAST. ALL OF THE MODELS INDICATE MODERATE N WINDS OVER THE
CA WATERS AND FAR SE OREGON WATERS BEGINNING THU NIGHT AND
CONTINUING INTO SAT AFTERNOON. THE WINDS WILL THEN DECREASE AS THE
TROUGH WEAKENS. ALL OF THE MDLS AGREE THAT WINDS WILL REMAIN JUST
BELOW GALE THRESHOLD. LOOKING AHAD TO SAT NIGHT AND BEYOND...A
WARM FRONT WILL MOVE ACROSS THE WA/OR WATERS SAT NIGHT WITH A WEAK
COLD FRONT FOLLOWING. THIS COLD FRONT WILL MOVE ACROSS THE WA/OR/N
CA WATERS SUN WHILE CONTINUING TO WEAKEN FURTHER. WINDS WILL AGAIN
REMAIN BELOW GALE WITH THIS FRONT. HIGH PRES WILL THEN REBUILD
AGAIN TUE. IN SUMMARY...WILL POPULATE GRIDS USING THE 12Z GFS 10M
WINDS THROUGHOUT.

.SEAS...THE 18Z SEA STATE ANALYSIS INDICATED THAT OBSERVED SEAS
CONTINUE TO BE WITHIN A FT OF THE MWW3 FCST VALUES. SINCE WILL BE
USING THE GFS WINDS WILL ALSO POPULATE WAVE GRIDS USING THE MWW3
THROUGH THE FCST PERIOD.

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



.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
     NONE.

.PZ6 CALIFORNIA WATERS...
     NONE.

$$

.FORECASTER MUSONDA/KOSIER. OCEAN PREDICTION CENTER.



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.