Marine Interpretation Message
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AGNT40 KWNM 140104
MIMATN

MARINE WEATHER DISCUSSION FOR N ATLANTIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
904 PM EDT SUN JUL 13 2014

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

THE ONLY CHANGE FOR THE EVE UPDATE WILL BE TO ADD A FT OR TWO TO
THE SEA HTS FCST FOR MAINLY THE GULF OF MAINE OFF WTRS PER THE
LATEST OBS AND ALTIMETER DATA FROM THAT REGION WHERE SEA HTS HAVE
RISEN TO NRLY 8 FT...OR ABOUT 2 FT ABV THE ONGOING FCST. REFER TO
THE 00Z RA1 SEA STATE ANALYSIS FOR DETAILS. OTW...NO SIG CHANGES
APPEAR NEEDED TO THE PREV FCST FOR THE EVE UPDATE.

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

TRANQUIL...SEASONAL CONDITIONS  WILL CONTINUE THROUGH THE
FORECAST. UPR HIGH OVER THE SW ATLC WILL GRADU BUILD N THROUGH
MIDWEEK...THEN CONT WHILE EXPANDING NE AND WWRD TWDS THE WEEKEND.
LKWS...THE ASSD SFC HIGH WILL REMAIN ANCHORED NR 35N50W...THEN
DRIFT N...STRNGTHN AND EXPAND W THRU THE WEEK. WINDS WL RMN 25 KT
OR BLO WWITH SEAS 8 FT OR LESS THRU THE FCST.

HIGHEST WINDS...WL BE SW TO 25  KT OVR THE GF OF MAINE TNGT...AND
15 TO 20 KT ELSWHR N OF BALT CNYN. WINDS WILL EASE A BIT MON AS
INLAND TROF WKNS...THEN INCRS SLGTLY MON NGT AND TUE AS CLD FRNT
APPCHS. WINDS WL CONT S TO SW 15 TO 20 KT...BUT MAY REACH 25 KT AT
TIMES MON NGT THRU WED...AND WL CAP WINDS AT 25 KT IN THE GRIDS.
GFS SHOWS HIGHEST 925 MB WINDS AT 40 KT 12Z WED...THEN DMNSHNG
THEREAFT. THE ONLY SIG FTR IS APPCHNG COLD FRONT. GFS/UKMET/ECMWF
AGREE ON WKNG CLD FRONT MVNG OFF THE MID ATLC COAST BY 12Z
WED...THEN DRIFTNG E...MVNG ABOUT ONLY 120 NM ESE IN THE NEXT 24
HOURS AS SW ATLC HIGH STRNGTHS. FRONT WILL CONT TO SLIDE SE THU
INTO FRI...BUT DSIPTNG INTO A WK TROF. WINDS WL RMN LGT AND FRONT
WIL MAINLY NE A NUISENSE TO WINDS DRCTN. FOR FRI AND FRI
NGT...GFS/UKMET/ECMWF AGREE ON WK BOUNDRY RMNG BTWN 37N TO 40N
ACROSS THE WATERS. THE GFS/UKMET XTND THIS BOUNDY SW ALONG THE SE
COAST...WHILE THE GEM AND 00Z ECMWF HV IT FTHR OFFSHR. WL STAY
WITH AMD USE A 50/50 GFS/UKMET BLEND TO SMOOTH OUT THE WK
FTRS...AND WL GIVE LGT SRLY WINDS OVER THE WATERS S OF BALT CNYN.
JUST SAW THE 12Z ECMWF AND IT IS TRENDING TWDS THE GFS/UKMET SOL
WITH RSPCT TO WK BNDRY LOC.

.SEAS...THE 12Z MULTIGRID WW GUID LOOKS GOOD OVERALL THRU THE PD.
SEAS ARE TAD TOO HIGH OVR THE NTHRN WATERS IN THE SRLY FLOW AND
MAY BE TRIMMED BACK BY A FT AT TIMES...ESP TUE NGT AND WED WHERE 9
FT SEAS OVR THE WATERS N OF 40N LOOKS A LTTL TOO HIGH.


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



.WARNINGS...PRELIMINARY.

.NT1 NEW ENGLAND WATERS...
     NONE.

.NT2 MID ATLC WATERS...
     NONE.

$$

.FORECASTER MILLS/PROSISE. OCEAN PREDICTION CENTER.


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