Marine Interpretation Message
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000
AGNT40 KWNM 191946
MIMATN

Marine Weather Discussion for N Atlantic Ocean
NWS Ocean Prediction Center Washington DC
246 PM EST Fri Jan 19 2018

.FORECAST DISCUSSION...Major features/winds/seas/significant
.weather for the North Atlantic Ocean W of 50W from 30N to 50N.

Per the 18z OPC surface analysis a high pressure ridge continued
across the offshore NT1 and NT2 waters. A low pressure trough was
located near the Mid-Atlantic coast. Strong low pressure well E
of the region near 42N53W continued to pull away to the E. Latest
available ASCAT high resolution imagery reveals 10-20 kt winds
over the NT1 waters. 20-30 kt winds were noted over the NE NT2
waters with 5-15 kt winds noted over the inner NT2 waters.

The latest 12z guidance was in fairly good agreement in the short
term through Sunday 12z, with some differences noted later Sunday
and Monday in regards to the speed of a high pressure ridge
moving through the region. Guidance then comes back into
agreement at least early Tuesday in regards to the timing and
strength of a cold front expected to approach the waters. The 12z
GFS is then slightly faster than the 12z ECMWF/UKMET in pushing
the front E through the region later Tuesday through Wednesday
though guidance remains in agreement in a period of pre-frontal
gales. With that noted populated grids through Sunday 12z with
the 12z GFS, using the 30m up through Sunday 00z before
transitioning to the 10m winds. Only change to the warning
headlines in the short term was to introduce gales about 6 hours
early now over parts of the NT1 waters, with gales starting
Saturday 15z. Beyond Sunday 12z, with some of the differences
noted, albeit not necessarily huge differences, allowed ongoing
grids to continue in place. This will result in no adjustments
to the warning headlines beyond Sunday 12z.

SEAS...Favored 12z NWW3 through Sunday 12z transitioning to
existing grids beyond that point.

.EXTRATROPICAL STORM SURGE GUIDANCE...No major deviation from
the latest surge guidance appears necessary through the forecast
period.


.WARNINGS...Preliminary.

.NT1 New England Waters...
.ANZ800...Gulf of Maine...
     Gale Saturday.
     Gale Possible Tuesday into Tuesday night.
.ANZ805...Georges Bank west of 68W...
     Gale Saturday.
     Gale Possible Tuesday.
.ANZ900...Georges Bank east of 68W...
     Gale Saturday.
.ANZ810...South of New England...
     Gale Saturday.

.NT2 Mid-Atlantic Waters...
.ANZ920...Baltimore Canyon to the Great South Channel...
     Gale Possible Tuesday into Tuesday night.
.ANZ905...The Great South Channel to the Hague Line...
     Gale Saturday.
     Gale Possible Tuesday night.
.ANZ910...East of the Great South Channel and south of 39N...
     Gale Possible Tuesday night.
.ANZ925...Outer Waters from Baltimore Canyon to Hatteras Canyon...
     Gale Possible Tuesday into Tuesday night.

$$

.Forecaster Holley. Ocean Prediction Center.


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