Marine Interpretation Message
Issued by NWS

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AGNT40 KWNM 020109
MIMATN

MARINE WEATHER DISCUSSION FOR N ATLANTIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
909 PM EDT TUE SEP 1 2015

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

HIGH PRES CURRENTLY ACROSS THE NT1 AND NRN NT2 WATERS WILL MOVE E
OF THE OFFSHORE WATERS BY LATE WED. MAINLY LIGHT WINDS ARE
EXPECTED TO CONTINUE ACROSS MOST OF THE OFFSHORE WATERS THROUGH
THU. STRONGER HIGH PRES IS STILL EXPECTED TO MOVE S INTO NRN NEW
ENGLAND BY LATE FRI AND THEN CONTINUE INTO THE NT1 WATERS BY LATE
SAT. NE FLOW WILL INCREASE TO 25 KT OR SO ACROSS THE SRN NT1
WATERS BY FRI AND ACROSS THE NRN NT2 WATERS BY FRI NIGHT. THE
WINDS WILL THEN DIMINISH SOMEWHAT BY SUN AS THE HIGH MOVES FARTHER
S. THE LATEST RUNS OF THE GFS AND ECMWF LOOK TO BE IN REASONABLE
AGREEMENT. CURRENT FORECAST LOOKS REASONABLE AND WILL CONTINUE TO
CARRY NO WARNINGS ACROSS THE OFFSHORE WATERS DURING THE FORECAST
PERIOD.

THE WNA VERSION OF THE NWW3 LOOKS REASONABLE WITH THE
SEAS AND WILL BE FOLLOWED FAIRLY CLOSELY DURING THE FORECAST
PERIOD.

EXTRATROPICAL STORM SURGE GUIDANCE...N/A.

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

AT 18Z OPC SFC ANALYSIS SHOWED A COLD FRONT OVER THE NE NT2 WATERS WHILE
1017 MB LOW WAS ROUGHLY 115 NM E OF CAPE HATTERAS. A WARM FRONT EXTENDED
E FROM THE CENTER OF THE LOW ACROSS THE ANZ925 WATERS. A 1502Z ASCTB
HIRES PASS INDICATED WINDS 15 KT AND UNDER OVER THE NT1 WATERS. OVER
THE NT2 WATERS 25 KT WINDS WERE NOTED THE SRN AND NRN ANZ925 AND ANZ930
WATERS RESPECTIVELY WHILE 20 KT WINDS WERE PRESENT OVER THE SE ANZ833
WATERS. WINDS 15 KT OR LESS WERE NOTED THROUGHOUT THE REST OF THE NT2
WATERS WHERE ASCT DATA WAS AVAILABLE.

12Z GUIDANCE LOOKS REASONABLE THROUGH DAY 3 W/SOME DIFFERENCES ARISING
DAY 4 AND 5 IN REGARDS TO LOW PRES EXPECTED E OF WATERS. THOUGH
THESE DIFFERENCES AT THE MOMENT DONT HAVE A HUGE IMPACT ON
CONDITIONS OVER THE NT1/NT2 OFFSHORE WATERS. LOW PRES OVER THE NT2
WATERS SLIDES SE TONIGHT INTO WED AS WEAK HIGH PRES OVER THE NT1
WATERS ALSO SLIDES SE. A COLD FRONT IS STILL ANTICIPATED TO MOVE
INTO THEN CROSS THE NT1 AND NRN NT2 WATERS LATE WED/THURS INTO
LATE THURS/EARLY FRI...W/INCREASING N/NE-LY FLOW BEHIND IT AS HIGH
PRES BUILDS IN. CURRENT THINKING OF WINDS UP TO 25 KT OR SO AS THE
HIGH BUILDS IN REMAINS REASONABLE.

THE HIGH REMAINS CENTERED IN IN THE VICINITY OF THE MID-ATLANTIC COAST/WATERS
W/ITS RIDGE EXTENDING OVER THE NT1 AND NT2 WATERS THROUGH THE END OF
THE PERIOD. HOWEVER SOME UNCERTAINTY DEVELOPS IN REGARDS TO THE DEVELOPMENT
AND TRACK OF LOW PRES E OF THE WATERS. WHILE DIFFERENCES ARE
NOTED DAY 4 AND PART OF DAY 5 BETWEEN THE 12Z
GFS/UKMET/ECMWF...W/THE GFS BEING FARTHEST E AND THE ECMWF
FARTHEST W...BY THE END OF DAY 5 THE MODELS PLACE THE LOW ROUGHLY
200 TO 300 NM E/NE OF BERMUDA. WILL CONTINUE TO MONITOR THE
EVOLUTION OF THE LOW LATER IN THE PERIOD.

.SEAS...WILL GENERALLY FAVOR THE 12Z NWW3 OVER THE PERIOD WITH
SOME TWEAKS TO SEAS DURING THE PERIOD OF INCREASED WINDS AS HIGH
PRES BUILDS IN BEHIND THE FRONT.

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


.WARNINGS...PRELIMINARY.

.NT1 NEW ENGLAND WATERS...
     NONE.

.NT2 MID ATLC WATERS...
     NONE.

$$

.FORECASTER NOLT/HOLLEY. OCEAN PREDICTION CENTER.



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