Marine Interpretation Message
Issued by NWS

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000
AGNT40 KWNM 201904
MIMATN

MARINE WEATHER DISCUSSION FOR N ATLANTIC OCEAN
NWS OCEAN PREDICTION CENTER WASHINGTON DC
304 PM EDT SAT SEP 20 2014

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

SUMMARY...LIGHTNING DATA PRODUCT SHOWS AREAS OF ISOLD/SCTRD SHWRS
AND TSTMS OVER THE NT2 ZONES THIS AFTN. LATEST HI-RES ASCAT PASS
AT 1425Z THIS MRNG SHOWED A SWATH OF 25 TO 30 KT WINDS OVER THE
ERN PART OF THE NRN/CNTRL NT2 OFSHR WTRS...AND A SECOND SWATH OF
25 TO 30 KT WINDS OVER THE SRN NT2 OFSHR WTRS. A STG HI PRES RDG
WILL MOVE E ACROSS THE OFSHR WTRS THIS EVNG...THEN SHIFT E OF THE
AREA TONIGHT INTO SUN. A DVLPG LOW WILL FORM OFF THE SE CST EARLY
TONITE...PASS NE OVER THE NT2 AREA SUN...THEN MOVE OFF TO THE NE
SUN NITE INTO MON. THE LOW WILL PULL A COLD FRONT E ACROSS THE ERN
NT2 WTRS SUN INTO MON. ANOTHER COLD FRONT WILL APPROACH FROM THE
NW LATE SUN INTO SUN NIGHT...THEN MOVE SE ACROSS THE AREA MON INTO
MON NITE. ANOTHER STG RDG WILL BUILD IN FROM THE W AND NW TUE THRU
WED NITE...THEN MAINTAIN A RDG OVER THE OFSHR WTRS THU AND THU
NITE.

MODELS...12Z UKMET LOOKS MUCH TOO STG/DEEP WITH THE LOW MOVG NE
OVER THE OFSHR WTRS SUN INTO MON...AND ALSO DVLPS AN ANOMALOUS LOW
IN THE WTRS NEAR CAPE HATTERAS THU AND THU NITE. 12Z GEM DVLPS
ANOTHER ANOMALOUS LOW JUST E OF THE NT2 AREA TUE NITE...THEN
DRIVES THE LOW NWD ALG 70W WHILE DEEPENING IT. SO THE 12Z GEM AND
UKMET ARE NOT PREFERRED MDL SOLNS. OTHW...THE 12Z MED RNG MDLS
ARE IN GUD AGREEMNT THRU THE FCST PRD. WILL USE THE REPRESENTATIVE
12Z GFS 10M FOR THE WIND GRIDS.

.SEAS...BASED ON THE 18Z RA1 SEA HT ANALYSIS THE SEA HTS ARE IN
THE 2 TO 5 FT RNG OVER THE NT1 WTRS AND IN THE 5 TO 11 FT RNG IN
THE NT2 AREA. THE 12Z MULTIGRID WW3 MDL INITIALIZED WELL VERSUS
THE BUOY OBS...AND HAS GUD SUPPORT OVERALL FROM THE 12Z ECMWF WAM
THRU THE FCST PRD...SO WILL USE 12Z MWW3 GUIDANCE FOR THE WAVE HT
GRIDS.

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

.WARNINGS...PRELIMINARY.

.NT1 NEW ENGLAND WATERS...
.ANZ900...GEORGES BANK EAST OF 68W...
     GALE SUN NIGHT.

.NT2 MID ATLC WATERS...
.ANZ920...BALTIMORE CANYON TO THE GREAT SOUTH CHANNEL...
     GALE SUN INTO SUN NIGHT.
.ANZ905...THE GREAT SOUTH CHANNEL TO THE HAGUE LINE...
     GALE SUN NIGHT.
.ANZ910...EAST OF THE GREAT SOUTH CHANNEL AND SOUTH OF 39N...
     GALE SUN NIGHT.
.ANZ925...OUTER WATERS FROM BALTIMORE CANYON TO HATTERAS CANYON...
     GALE SUN AND SUN NIGHT.
.ANZ930...OUTER WATERS FROM HATTERAS CANYON TO CAPE FEAR...
     GALE SUN INTO SUN NIGHT.
.ANZ935...OUTER WATERS FROM CAPE FEAR TO 31N...
     GALE SUN.

$$

.FORECASTER SCOVIL. OCEAN PREDICTION CENTER.



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