Marine Interpretation Message
Issued by NWS

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571
AGPN40 KWNM 221524
MIMPAC

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

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

A HIGH PRES RDG RMNS CNTRD TO THE W OF THE OFFSHR WTRS. THE RDG
STRENGTHENS FM LATER THIS AFTN THRU EARLY SUN WHILE GRADUALLY
DRIFTING EWD. A COASTAL TROF DVLPS ALG THE NRN AND CNTRL CA LATE
TNGT INTO SAT. THIS MRNG THERE IS ENHANCED NWLY WINDS TO 25 KT OVR
THE WA WTRS BETWEEN THE HIGH PRES RDG W OF THE AREA AND A INLAND
TROF THAT XTNDS NW ACRS INLAND COASTAL AREAS OF BRITISH COLUMBIA.
HAV NOT SEEN ANY OBS OVR THE WA WTRS WITH WINDS TO 25 KT...BUT
JUST N OF THE WA WTRS WINDS WERE TO 25 KT. THIS AREA OF ENHANCED
WINDS PERSISTS INTO TUE AS SYNOPTIC PATTERN CHANGES LTL WITH LGTR
WINDS AT TIMES OVR THIS REGION. ELSW ALG THE ERN AREAS OF THE NRN
AND CNTRL CA WINDS SHUD INCRS LATER TNGT THRU EARLY SUN...THEN
DMNSH AS THE RDG WKNS ON SUN. FEW CHANGES WL BE MADE TO PREV GRIDS
WHICH SEEM RSNBL THRU THE FCST PD.

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

THE LTST SAT IMG STILL INDC THAT MOST OF THE CONVXN IS OVR THE
NRN AND CNTRL WTRS WITH NO LIGHTNG STRIKES XCPT FOR THE INLAND
AREAS ADJ TO THE WTRS. THE RADAR HAS NO SIGN OF TSTMS CELLS OVR
THE REGION. AT 22/0600Z A BROAD HGH PRES STILL ORIENTED IN THE N
TO S WITH ONE CNTR 1025 MB NR THE GULF OF AK AND A SECOND CNTR
1021 MB NR 32N135W IS JUST W OF THE REGION AND XTNDS ITS WEAK
RIDGE ACRS THE REGION. INLAND LOW PRES WITH CNTR OVR THE SRN NV
HAS ITS NRN TROF INTO SRN NV WHILE ANOTHER INLAND LOW PRES 1009 MB
IS OVR OR/WS AREA. THE PRES GRDNT IS VERY SLCK OVR THE ENTIRE
FRCST WTRS AND THE MAX OBSVD WIND SPEEDS ARE ONLY 25 KT. THE LTST
R-SCAT PASS AT 0618Z HAD MAX WINDS TO 25 KT OVR THE NRN WTRS.
BUOY 46005 300 NM W OF WA HAS WINDS TO 15 KT WITH GUSTS TO 20 F.

THERE IS SOME LOCLY INDCD ENERGY OVR THE FAR SRN WTRS EMBDD IN AN
UPPRLVL TROF. MOST OF THESE ENRGY WILL BE PUSHED SE IN THE SHORT
TERM LEAVING AN UPPRLVL RIDGE TO DOMINATE THE REGION. MORE SIG
ENERGY WILL BE CUT OFF FROM THE ARCTIC AIRMAS OVR THE CNTRL PAC.
BUT BY THE TIME THE ENRGY REACHES THE WTRS IT WILL HV LOST MOST OF
IT. HENCE THE DOMINANT UPPRLRVL RIDGE WILL EITHER WEAKEN OR BLOCK
ANY FRNTL SYSMS AS THEY APPROCH THE FRCST REGION.

THE GLBL MDLS HV INITIALIZED VERY WELL AND THEY ARE IN GUD AGRMNT
ESPCLY IN THE SHORT TERM. SEE NO NEED TO DEVIATE FROM THE PREVIOUS
SOLN AND SO WILL STAY WITH HFS. IN THE SHORT TERM THE TWO HGH PRES
CNTRS WILL GET CLSR AS THEY STRENGTHEN AND WILL STILL REMAIN
ANCHORED TO THE W AND BLOCK ANY FRNTL SYSTEMS FROM ADVNCG E. THE
PRES GDRNT WILL CONTINUE TO REMAIN SLCK THRU THE FRCST PRD AND SO
NO WRNGS IN FCST.

.SEAS...THE SEAS ARE EQUALLY SMALL WITH PEAKS AT 9 FT OVR THE NRN
WTRS. ELSEWHERE SEAS RANGE BTWN 6 AND 9 FT OVR THE NRN AND 3 TO 6
FT OVR THE SRN WTRS. THE NWW3 MULTI GRID WV MDL FITS EVRY WELL
WITH THE SEAS PATTERN AND HAS BEEN QUITE CONSSTNT IN THE PREV
RUNS.

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



.WARNINGS...PRELIMINARY.

.PZ5 WASHINGTON/OREGON WATERS...
     NONE.

.PZ6 CALIFORNIA WATERS...
     NONE.

$$

.FORECASTER ROWLAND/MUSONDA. OCEAN PREDICTION CENTER.



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