AGNT40 KWNM 201223
MIMATN
MARINE WEATHER DISCUSSION 
NWS OCEAN PREDICTION CENTER WASHINGTON DC
820 AM EDT SAT 20 SEP 2008 
.FORECAST DISCUSSION: MAJOR FEATURES/WINDS/SEAS/SIGNIFICANT 
.WEATHER FOR NORTH ATLANTIC OCEAN W OF 50W FROM 30N TO 50N. 
A HIGH PRES RIDGE EXTENDS FROM W TO E ACROSS NT1 WTRS...AS A 
WEAK LOW PRES AREA IS LOCATED OVER THE S AND SE PARTS OF THE NT2 
WTRS. THE PRES GRAD BTWN THESE FTRS WILL WEAKEN TONITE AND 
SUN...AS THE RIDGE SHIFTS WELL E OF THE NT1 WTRS AND THE AREA OF 
LOW PRES MOVES NE. CONDS SHD SLWLY IMPRV OVR THE OFSHR WTRS THIS 
EVNG INTO SUN...AS THE PRES GRAD WEAKENS. A COLD FRNT WILL MOVE 
SE AND APRCH THE CST OF MAINE THIS MRNG...ENTER THE NT1 WTRS 
LATER SUN...THEN PASS SE OF THE NRN NT2 WTRS SUN NGT INTO MON. 
THE TAIL END OF THE FNT WILL STALL ACROSS THE SRN NT2 WTRS LATER 
MON...AS RDG BLDS SE INTO THE WTRS N OF VA CAPES. STG RDG WILL 
CONT TO BLD SE OVER THE OFSHR WTRS TUE AND WED...AS AN AREA OF 
LOW PRES PERSISTS S OF THE NT2 WTRS. THE PRES GRDT BTWN THE RDG 
AND THE AREA OF LOW PRES SHD BE STG ENUF ON TUE AND WED TO 
PRODUCE GALES IN THE NE FLOW ACROSS ALL OF THE NT2 WTRS...EXCEPT 
FOR THE HUDSON TO BALT CYN AREA. WINDS SHD BE LIGHT OVER THE NT1 
WTRS ON TUE AND WED...AS THE HI PRES CNTR MOVES E THRU THE CAPE 
COD AREA.
THE MED RNG MDLS ARE IN GUD AGREEMENT THRU THE FCST PRD...AND 
MAIN EXCEPTION TO THIS IS THE GEM WHICH MOVES A LOW NE INTO THE 
SRN NT2 WTRS DURING THE TUE AND WED TIMEFRAME. THE UKMET LOOKS 
SOMEWHAT SIMILAR TO THE GEM...BUT DOES NOT MOVE THE LOW SO 
QUICKLY TO THE NE. OTHER MDLS KEEP THE LOW S OF THE NT2 WTRS 
THRU WED. GFS/ECMWF/NOGAPS ARE IN VRY GUD AGREEMNT...SO WILL 
CONT TO FAVOR THE GFS SOLN...WITH NO SIGNIF CHANGES PLANNED TO 
THE CURRENT FCST TREND.
SEAS...MAX SEA HTS OF 14 TO 15 FT WERE NOTED OVR THE NE AND 
CNTRAL NT2 WTRS THIS MRNG. SEAS AND E TO NE SWELLS ARE STILL 
EXPECTED TO ONLY GRADU SUBSIDE TODAY THRU SUN...AS THE WINDS 
ALSO SLWLY DIMINISH. SEAS SHD BUILD LATE MON INTO WED AS NE FLOW 
INCREASES. INTEND TO STAY CLOSE TO 06Z WNA WAVEWATCH III 
MDL...EXCEPT WILL ADD A FEW FT TO THE MDL GUIDANCE IN THE NT2 
WTRS FOR TUE AND WED...GIVEN THAT WE ARE EXPCTG STG NE FLOW 
ACROSS THE GULF STREAM.
.WARNINGS/FORECAST CONFIDENCE...PRELIMINARY. ANY CHANGES WILL BE 
COORDINATED THROUGH AWIPS 12 PLANET CHAT OR BY TELEPHONE: 
.NT1 NEW ENGLAND WATERS... 
.GULF OF MAINE...NONE. 
.GEORGES BANK...NONE. 
.S OF NEW ENGLAND....NONE. 
.NT2 MID ATLC WATERS... 
.HUDSON TO BALT CNYN...NONE. 
.BALT CNYN TO HAGUE LINE...GALE TUE INTO WED...MDT TO HIGH 
CONFDC. 
.BALT CNYN TO HATTERAS CNYN...GALE TUE INTO WED...MDT TO HIGH 
CONFDC. 
.HATTERAS CNYN TO CAPE FEAR...GALE TUE INTO WED...MDT TO HIGH 
CONFDC. 
.CAPE FEAR TO 31N...GALE TUE INTO WED...MDT CONFDC. 
.FORECASTER SCOVIL. OCEAN FORECAST BRANCH.