Marine Interpretation Message
Issued by NWS

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000
AGNT40 KWNM 301302
MIMATN

MARINE WEATHER DISCUSSION FOR N ATLANTIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
900 AM EDT WED 30 JUL 2014

.FORECAST DISCUSSION: MAJOR FEATURES/WINDS/SEAS/SIGNIFICANT
.WEATHER FOR THE NORTH ATLANTIC OCEAN W OF 50W FROM 30N TO 50N.

LAST NGTS MDLS WERE GENERALLY CONSISTENT WITH PREVIOUS RUNS OVER
THE W ATLC. 00Z/06Z GFS AND HI RES 00Z ECMWF CONTINUE TO SHOW
SOME WINDS UP TO 30 KT OVER NERN NT2 ZONES ANZ905 AND ANZ910 TDA
INTO EARLY THU AS LOW PRES CENTER RIDE NE ALONG SLOW MOVING COLD
FRONT. MDLS DIFFER SLIGHTLY ON HOW QUICKLY WEAK STNRY FRONT WILL
LIFT N AND NW THU NGT INTO SUN. 00Z ECMWF WAS A BIT FASTER WITH
FRONT THAN 00Z/06Z GFS. FOR THIS MORNINGS NT1/NT2 UPDATES WILL
NOT BE MAKING SIGNIFICANT ADJUSTMENTS TO PREVIOUS GRIDS WHICH
FAVORED 00Z GFS. 06Z MULTIGRID WAVEWATCH III SIG WV HGTS HAVE
BEEN IN LINE WITH LATEST W ATLC SHIP/BUOY OBS OVER LAST FEW HRS.

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

IR SATEL INDICATES WK LOW PRES APRS TO BE WELL ABT 140 NM E OF
THE NC COAST THIS EARLY THIS MRNG. EARLIER ASCAT PASS FM 0138Z
HAD A SWATH ALG THE MID ATL WTRS BETWEEN BETWEEN 77W AND 171W
WITH THE SFC LOW APPRG INVOF 34N/74W ABT 110 NM SE OF THE NC
COAST. UNFORTUNATELY DID NOT HAV DATA FURTHER E TO VERIFY
STRENGTH OF SWLY FLW INADVOF CD FNT. LTG HAS BEEN INCREASING OVR
THE PASS SVRL HRS E OF THE FNT WHICH SUPPORTS AN INCRS IN WINDS
IN THIS AREA. MDLS LIFT THE ILL DEFINED LOW NE INTO THE NRN MID
ATLC LATER THIS AFTN AND THEN INTO NEW ENGLAND WTRS BEFORE
DSIPTG NE OF THE AREA THU. GFS/GEM CONT TO BE STGR WITH WINDS
OVR WM SECTOR OF THE LOW AND ALG AND E OF THE FNT TDA WHILE
UKMET/12Z ECMWF ARE WKR. THE CD FNT DOES NOT MOV FAR TO THE E
TDA AND TNGT AS BROAD AREA OF HIGH PRES EXPANDS E OF THE WTRS.
THE FNT SLOWLY MOVS BACK TO THE W AND NW THU THRU SUN AS A WM
FNT WHILE MOVG TOWARDS THE MID ATLC COASTLN AND NEW ENGLAND
COASTLN SUN. PLAN TO CONT TO FAVOR THE GFS AND WL USE 30M WINDS
FOR TDA INTO TNGT... THEN 10M WINDS THRU THE RMNDR OF THE FCST
PD.

SEAS...WWIII AND ECMWF WV LOOK SMLR TO RECENT 06Z BUOY OBS ACRS
THE OFFSHR WTRS. ECMWF CONTS TO SHOW LWR SEAS OVR THE ERN N ATLC
WED NGT AS THE LOW PRES LIFTS NE TDA. WL CONT TO FAVOR THE WWIII
WITH ITS HIGHER SEAS BY LATER TDA AND TNGT. BY LATE THU AND THU
NGT THE WWIII AND ECMWF ARE IN BETTER AGRMT AND WL USE A 50/50
BLEND THRU SUN NGT WITH WWIII NOW IN BETTER AGRMT WITH ECMWF BY
SUN NGT.

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

.WARNINGS...PRELIMINARY.

.NT1 NEW ENGLAND WATERS... NONE.

.NT2 MID ATLC WATERS... NONE.

$$

.FORECASTER CLARK/ROWLAND. OCEAN PREDICTION CENTER.



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