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Atlantic Text Briefing Package

[Printable Version]

AGNT40 KWNM 181249
MIMATN

Marine Weather Discussion for N Atlantic Ocean
NWS Ocean Prediction Center Washington DC
749 AM EST Mon Dec 18 2017

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

Current Conditions...The 06z ncep surface analysis shows a
stationary front extending roughly W to E across the northern 
and central nt2 waters from Wallops Island, but otherwise shows 
high pres ridging over the offshore waters. Latest available 
ascat and ascat hi-res passes from last night indicate 20 to 25 
kt winds in NW flow over zones 905/910 of the NE nt2 waters, and 
10 to 20 kt winds across the remaining offshore waters. A weak
low will move along the stationary front today and tonight,
passing E across the nt2 area. A strong cold front will pass SE 
over the offshore waters Tue night and Wed, then stall across the
southern nt2 waters late Wed and Wed night, so we have gale
warnings up that timeframe for the nt1 and NE nt2 waters with 
average confidence. Another low will pass E across the southern 
nt2 waters Wed night and Thu while pulling a second cold front 
over the area. A large high pres ridge will work its way E across
the offshore waters late Thu through Fri night.

Models/Forecast...The medium range models are in good overall
agreement across the offshore waters during the forecast period,
except the gfs looks like a very fast and strong outlyer 
solution for Fri through Fri night and beyond. The ascat winds 
have been coming in a bit stronger than what has been suggested 
by the ecmwf, so will be going with a 50/50 blend of the ecmwf 
and the more robust gfs 30m solution for today into Wed. The more
consistent and representative ecmwf will be used exclusively for
the wind grids for late Wed through the rest of the forecast 
period. Am not planning to make any significant changes to the
current forecast trend at this time.

Seas...The wna wavewatch and ecmwf wam both initialized well
across the offshore waters. Mainly for consistency reasons, will
continue to use a 75/25 blend of the wavewatch/wam for the wave
height grids for today through Thu night. Then will go 
exclusively with the ecmwf wam for Fri through the rest of the 
forecast period, since we want to be consistent with the ecmwf 
wind grids, which are strongly preferred for that timeframe. 

Extratropical Storm Surge Guidance...N/A.

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

The 01 UTC Ascat still returned some northwest winds to 25 kt 
across the far outer ANZ905 and ANZ910 zones, while the 
subsequent pass even showed some 20 kt winds south of the 
stationary boundary as far west as about 80 to 150 nm southest 
of Cape Charles, over the Gulf Stream. The 00 UTC GFS first 
sigma level winds were the best initialized with these higher 
winds offshore. The 00 UTC models are consistent that relatively 
weak gradients and surface winds will occur across the offshore 
waters at least through the early part of today as the high 
pressure ridge is forecast to shift east of the offshore waters. 
Also, the models share a similar timing in with a developing 
surface low along the stationary front across the northern NT2 
waters today. The developing low should pull the weak front 
south to near Cape Fear Mon before it again stalls and 
dissipates tonight/Tue. Based on the slightly higher winds seen 
in the Ascat, will be blending in some of the higher 00 UTC GFS 
first sigma level winds with the previous OPC wind grids, which 
were based on the ECMWF, through tonight. 

The latest models then share a similar timing with another cold 
front forecast to move off the northern mid-Atlantic and New 
England coasts Tue night. The GFS and ECMWF have become more 
consistent, and slightly stronger compared to their respective 
runs yesterday, with the post-frontal west to northwest winds 
across the eastern NT1 and northeastern NT2 zones Tue night into 
Wed. As a result, we have increasing forecast confidence that 
there will be a brief period of gales across the Gulf of 
Maine/Georges Bank and the outer ANZ905 waters at that time. For 
these winds, we again used an even blend of the GFS first sigma 
level winds and the ECMWF 10m winds. The gale hazards will 
remain consistent with the previous offshore forecasts. 

The 00 UTC models are then consistent that a southern stream low 
will develop and move off the southern Mid Atlantic coast late 
Wed and Wed night, with the 00 UTC GFS/ECMWF/UKMET all 
advertising associated winds as high as 30 kt across the waters 
south of Cape Hatteras. Of note, the 00Z GFS even trended 
stronger than previous runs, and now shows some marginal gales 
associated with the low Wed night. We are favoring the weaker 
model consensus here, with winds only as high as 30 kt, close to 
the more consistent ECMWF. Once the low passes east of the 
offshore waters early Thu, the models are then consistent that 
an inverted low pressure trough will linger along the Carolina 
coast Thu night and Fri. At the same time, a strong high 
pressure ridge will pass east across the NT1 and northern NT2 
waters. 

The models then all show another cold front will approach the 
eastern seaboard late Fri and Fri night. However, the 00 UTC 
models vary as to the timing of the front, and vary widely with 
how amplified the supporting upper level trough is forecast. 
Versus its previous few runs, the 00 UTC GFS trended 
significantly faster, and also is a strong outlier with the 
pre-frontal winds Fri night into the weekend. OPC preference 
lies with the weaker slower non-GFS model consensus, which is 
also supported by the latest WPC medium range guidance.      

Seas: The 00 UTC Wavewatch III and 00 UTC ECMWF WAM are equally 
well initialized with the wave heights across the west Atlantic 
this morning. Will be updating the previously preferred 3:1 ECMWF
WAM and WW3 blend for the wave height grids through Thu night. 
Then, with the GFS being the strong outlier with the late Fri and
Fri night winds, we will transition solely to the 00Z ECMWF WAM 
beginning Fri. 

Extratropical Storm Surge Guidance...N/A. 

.WARNINGS...Preliminary.

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

.NT2 Mid-Atlantic Waters...
.ANZ905...The Great South Channel to the Hague Line...
     Gale Tuesday night.
     Gale Possible Wednesday.

$$

.Forecaster Scovil/Clark. Ocean Prediction Center.
Last Update:12:50Z, 18 December 2017
Updates: Four times per day

FZNT21 KWBC 181433
OFFNT1

Offshore Waters Forecast
NWS Ocean Prediction Center Washington DC
933 AM EST Mon Dec 18 2017

New England continental shelf and slope waters from 25 nm
offshore to the Hague Line, except to 1000 fm south of New
England.

Seas given as significant wave height, which is the average
height of the highest 1/3 of the waves. Individual waves may be
more than twice the significant wave height.

ANZ898-190400-
933 AM EST Mon Dec 18 2017

.SYNOPSIS FOR NEW ENGLAND WATERS...A high pressure ridge across
the waters will pass E of the area today. A weak low will pass E
across the Gulf of Maine late today and tonight. A cold front
will approach from the NW Tue, then pass SE across the area Tue
night, followed by a low pressure trough on Wed. Another ridge
will build offshore Wed night, move E over the waters Thu 
through Fri, then shift E of the area Fri night. 

$$

ANZ800-190400-
Gulf of Maine to the Hague Line-
933 AM EST Mon Dec 18 2017

...GALE WARNING...

.TODAY...S to SW winds 5 to 15 kt. Seas 1 to 3 ft. 
.TONIGHT...W to SW winds 10 to 20 kt. Seas 2 to 4 ft. Chance of
rain. 
.TUE...W winds 15 to 25 kt. Seas 3 to 6 ft. Areas of fog with
VSBY 1 nm or less. 
.TUE NIGHT...W winds 25 to 35 kt. Seas 4 to 8 ft, building to 8 
to 13 ft.
.WED...W winds 25 to 35 kt, becoming W to NW 25 to 30 kt. Seas
8 to 14 ft. 
.WED NIGHT...NW winds 20 to 30 kt. Seas subsiding to 6 to 11 ft.
.THU...NW winds 15 to 25 kt. Seas 5 to 9 ft. 
.THU NIGHT...NW winds 10 to 20 kt, becoming N to NW 5 to 15 kt.
Seas 4 to 7 ft. 
.FRI...N winds 5 to 15 kt, becoming variable. Seas subsiding to 
2 to 4 ft.
.FRI NIGHT...S to SE winds 5 to 15 kt, increasing to 15 to
25 kt. Seas 1 to 3 ft, building to 3 to 6 ft. 

$$

ANZ805-190400-
Georges Bank between Cape Cod and 68W north of 1000 fm-
933 AM EST Mon Dec 18 2017

...GALE WARNING...

.TODAY...S to SW winds less than 10 kt, becoming S to SE. Seas
2 to 3 ft. 
.TONIGHT...S winds 10 to 15 kt, becoming W 10 to 20 kt. Seas
3 to 5 ft. Chance of rain. 
.TUE...W winds 15 to 25 kt. Seas 4 to 7 ft. Areas of fog with
VSBY 1 nm or less. 
.TUE NIGHT...W winds 20 to 30 kt, increasing to 25 to 35 kt.
Seas building to 7 to 12 ft. 
.WED...W winds 25 to 30 kt. Seas 7 to 12 ft. 
.WED NIGHT...NW winds 20 to 25 kt. Seas 6 to 10 ft. 
.THU...NW winds 10 to 20 kt. Seas 5 to 8 ft. 
.THU NIGHT...NW winds 10 to 15 kt. Seas 3 to 6 ft. 
.FRI...N winds less than 10 kt, becoming E to SE. Seas 2 to
4 ft. 
.FRI NIGHT...S to SE winds 5 to 15 kt, becoming SE 10 to 20 kt.
Seas 3 to 5 ft. 

$$

ANZ900-190400-
Georges Bank between 68W and the Hague Line-
933 AM EST Mon Dec 18 2017

...GALE WARNING...

.TODAY...Variable winds less than 10 kt. Seas 2 to 4 ft. 
.TONIGHT...S winds 5 to 15 kt. Seas 2 to 4 ft. 
.TUE...W winds 15 to 25 kt. Seas building to 4 to 7 ft. 
.TUE NIGHT...W winds 25 to 30 kt, becoming 25 to 35 kt. Seas
building to 7 to 12 ft. 
.WED...W winds 25 to 35 kt, becoming 25 to 30 kt. Seas 9 to 14 
ft. 
.WED NIGHT...W to NW winds 20 to 30 kt. Seas 8 to 13 ft. 
.THU...NW winds 15 to 25 kt. Seas subsiding to 6 to 10 ft. 
.THU NIGHT...NW winds 10 to 20 kt, becoming 10 to 15 kt. Seas
4 to 8 ft. 
.FRI...N to NW winds 5 to 15 kt, becoming N to NE. Seas subsiding
to 3 to 5 ft. 
.FRI NIGHT...E to SE winds 5 to 10 kt, becoming S to SE 5 to
15 kt. Seas 2 to 4 ft. 

$$

ANZ810-190400-
South of New England between the Great South Channel and Montauk
Point to 1000 fm-
933 AM EST Mon Dec 18 2017

.TODAY...SE winds 5 to 10 kt, becoming 5 to 15 kt. Seas 2 to
3 ft. 
.TONIGHT...W to SW winds 15 to 25 kt. Seas 3 to 5 ft. Chance of
rain. 
.TUE...W winds 15 to 25 kt. Seas 4 to 7 ft. 
.TUE NIGHT...W winds 20 to 30 kt. Seas building to 6 to 10 ft. 
.WED...W to NW winds 20 to 30 kt. Seas 6 to 11 ft. 
.WED NIGHT...NW winds 20 to 25 kt. Seas 5 to 9 ft. 
.THU...N winds 15 to 20 kt, diminishing to 10 to 15 kt. Seas
4 to 7 ft. 
.THU NIGHT...N winds 5 to 10 kt. Seas 3 to 5 ft. 
.FRI...E to NE winds less than 5 kt, becoming SE. Seas 2 to
4 ft. 
.FRI NIGHT...S winds 15 to 25 kt. Seas building to 4 to 7 ft. 

$$

ANZ815-190400-
South of Long Island between Montauk Point and Sandy Hook to
1000 fm-
933 AM EST Mon Dec 18 2017

.TODAY...SE winds 5 to 15 kt, becoming W. Seas 1 to 3 ft. 
.TONIGHT...W winds 15 to 25 kt. Seas 3 to 5 ft. Areas of fog
with VSBY 1 nm or less. 
.TUE...W winds 15 to 25 kt. Seas 4 to 7 ft. Areas of fog with
VSBY 1 nm or less early. 
.TUE NIGHT...W winds 20 to 30 kt. Seas building to 6 to 10 ft. 
.WED...NW winds 15 to 25 kt. Seas 5 to 9 ft. 
.WED NIGHT...NW winds 20 to 25 kt, becoming N. Seas 4 to 8 ft. 
.THU...N winds 15 to 20 kt, diminishing to 10 to 15 kt. Seas
4 to 7 ft. 
.THU NIGHT...N to NE winds 5 to 10 kt. Seas subsiding to 2 to 
4 ft.
.FRI...E to SE winds 5 to 10 kt, becoming S 10 to 15 kt. Seas
1 to 3 ft. 
.FRI NIGHT...S winds 15 to 25 kt. Seas 2 to 4 ft, building to 
4 to 7 ft.

$$

.Forecaster Scovil. Ocean Prediction Center.
Last Update:14:35Z, 18 December 2017
Updates: Four times per day

FZNT22 KWBC 181434
OFFNT2

Offshore Waters Forecast
NWS Ocean Prediction Center Washington DC
934 AM EST Mon Dec 18 2017

West central North Atlantic continental shelf and slope waters
beyond 20 nm to 250 nm offshore, including south of Georges Bank
from 1000 fm to 250 nm offshore.

Seas given as significant wave height, which is the average
height of the highest 1/3 of the waves. Individual waves may be
more than twice the significant wave height.

ANZ899-190400-
934 AM EST Mon Dec 18 2017

.SYNOPSIS FOR MID ATLC WATERS...A high pressure ridge across the
waters will shift SE of the area today. Weak low pressure will
move E along a stationary front across the N and central waters
today into tonight. A cold front will approach from the NW Tue,
pass SE across the waters Tue night and Wed, then stall over the
southern waters late Wed and Wed night. Low pressure will pass E
across the S waters Wed night and Thu while pulling a cold front
over the S waters. Another ridge will build SE across the waters
later Thu and Thu night, then move E over the area Fri and Fri 
night. 

$$

ANZ820-190400-
Hudson Canyon to Baltimore Canyon to 1000 fm-
934 AM EST Mon Dec 18 2017

.TODAY...W to SW winds 5 to 15 kt. Seas 1 to 3 ft. 
.TONIGHT...W winds 15 to 25 kt. Seas 3 to 5 ft. Areas of fog
with VSBY 1 nm or less. 
.TUE...W winds 15 to 25 kt. Seas 3 to 6 ft. Areas of fog with
VSBY 1 nm or less early. 
.TUE NIGHT...W winds 15 to 25 kt. Seas 4 to 7 ft. 
.WED...NW winds 15 to 25 kt. Seas 4 to 7 ft. 
.WED NIGHT...N to NW winds 15 to 20 kt. Seas 4 to 7 ft. 
.THU...N winds 15 to 20 kt, diminishing to 5 to 15 kt. Seas 3 to
6 ft. 
.THU NIGHT...N winds 5 to 10 kt, becoming E to SE. Seas 2 to
4 ft. 
.FRI...SE winds 5 to 10 kt, becoming S to SE 10 to 15 kt. Seas
2 to 4 ft. 
.FRI NIGHT...S to SE winds 15 to 25 kt. Seas building to 4 to 7 
ft.

$$

ANZ915-190400-
Between 1000 fm and 38.5N west of 69W-
934 AM EST Mon Dec 18 2017

.TODAY...E winds 5 to 15 kt, becoming W. Seas 2 to 4 ft. 
.TONIGHT...W winds 15 to 25 kt. Seas 3 to 6 ft. 
.TUE...W winds 15 to 25 kt. Seas 4 to 7 ft. 
.TUE NIGHT...W winds 20 to 30 kt. Seas building to 6 to 10 ft. 
.WED...NW winds 20 to 30 kt. Seas 6 to 11 ft. 
.WED NIGHT...NW winds 15 to 20 kt, becoming N. Seas 4 to 8 ft. 
.THU...N winds 15 to 20 kt, diminishing to 10 to 15 kt. Seas
4 to 7 ft. 
.THU NIGHT...N winds 5 to 10 kt. Seas 3 to 5 ft. 
.FRI...E to SE winds 5 to 10 kt, becoming SE 5 to 15 kt. Seas
2 to 4 ft. 
.FRI NIGHT...S to SE winds 10 to 20 kt. Seas 3 to 6 ft. 

$$

ANZ920-190400-
Baltimore Canyon to 69W east of 1000 fm and south of 38.5N to
250 nm offshore-
934 AM EST Mon Dec 18 2017

.TODAY...W winds 15 to 25 kt. Seas 3 to 6 ft. Scattered showers.
.TONIGHT...W winds 15 to 25 kt. Seas 4 to 7 ft. 
.TUE...W to NW winds 15 to 25 kt. Seas 4 to 7 ft. 
.TUE NIGHT...W winds 20 to 30 kt. Seas 5 to 9 ft. 
.WED...NW winds 15 to 25 kt. Seas 5 to 9 ft. 
.WED NIGHT...N to NW winds 15 to 20 kt. Seas 4 to 8 ft. 
.THU...N winds 15 to 20 kt, diminishing to 10 to 15 kt. Seas
4 to 7 ft. 
.THU NIGHT...N winds 5 to 15 kt, becoming N to NE 5 to 10 kt.
Seas 3 to 6 ft. 
.FRI...E winds 5 to 10 kt, becoming SE 10 to 20 kt. Seas 3 to
5 ft. 
.FRI NIGHT...SE winds 10 to 20 kt, becoming S. Seas 3 to 6 ft. 

$$

ANZ905-190400-
East of 69W to the Hague Line between 1000 fm and 39N-
934 AM EST Mon Dec 18 2017

...GALE WARNING...

.TODAY...Variable winds less than 10 kt, increasing to 5 to
15 kt. Seas 2 to 4 ft. 
.TONIGHT...S to SE winds 5 to 15 kt, becoming W 15 to 25 kt.
Seas 2 to 3 ft, building to 3 to 6 ft. Chance of rain. 
.TUE...W winds 20 to 30 kt. Seas building to 5 to 9 ft. 
Scattered showers.
.TUE NIGHT...W winds 25 to 30 kt, becoming 25 to 35 kt. Seas
building to 8 to 14 ft. 
.WED...W winds 25 to 35 kt, becoming 25 to 30 kt. Seas 9 to
15 ft. 
.WED NIGHT...W to NW winds 20 to 30 kt. Seas 8 to 14 ft. 
.THU...NW winds 15 to 20 kt. Seas subsiding to 6 to 10 ft. 
.THU NIGHT...N to NW winds 10 to 20 kt, becoming 10 to 15 kt.
Seas 4 to 8 ft. 
.FRI...N to NW winds 5 to 15 kt, becoming variable 5 to 10 kt.
Seas 3 to 6 ft. 
.FRI NIGHT...S to SE winds 5 to 15 kt. Seas 3 to 4 ft. 

$$

ANZ910-190400-
East of 69W and south of 39N to 250 nm offshore-
934 AM EST Mon Dec 18 2017

.TODAY...E winds 10 to 20 kt, becoming W 15 to 25 kt. Seas 3 to
6 ft. 
.TONIGHT...W winds 20 to 30 kt. Seas 4 to 7 ft. Scattered
showers. 
.TUE...W winds 20 to 25 kt. Seas 5 to 8 ft. 
.TUE NIGHT...W winds 20 to 30 kt. Seas building to 7 to 12 ft. 
.WED...W winds 20 to 30 kt. Seas 8 to 13 ft. 
.WED NIGHT...N to NW winds 15 to 25 kt. Seas 7 to 12 ft. 
.THU...N to NW winds 15 to 20 kt. Seas subsiding to 6 to 9 ft. 
.THU NIGHT...N winds 10 to 15 kt. Seas 4 to 7 ft. 
.FRI...N to NE winds 5 to 10 kt, becoming E. Seas 3 to 5 ft. 
.FRI NIGHT...SE winds 5 to 10 kt, becoming S to SE 10 to 15 kt.
Seas 3 to 4 ft. 

$$

ANZ825-190400-
Baltimore Canyon to Cape Charles Light to 100 nm offshore-
934 AM EST Mon Dec 18 2017

.TODAY...W winds 5 to 15 kt. Seas 1 to 3 ft. 
.TONIGHT...W winds 5 to 15 kt, increasing to 10 to 20 kt. Seas
2 to 3 ft. 
.TUE...W to SW winds 5 to 15 kt, becoming W 10 to 20 kt. Seas
2 to 4 ft. 
.TUE NIGHT...W to NW winds 10 to 20 kt. Seas 2 to 4 ft. 
.WED...NW winds 10 to 20 kt, becoming N to NW 10 to 15 kt. Seas
2 to 4 ft. 
.WED NIGHT...N winds 10 to 20 kt. Seas 3 to 6 ft.
.THU...N winds 15 to 20 kt, diminishing to 10 to 15 kt. Seas
3 to 6 ft. 
.THU NIGHT...NE winds 5 to 10 kt, becoming E. Seas 2 to 4 ft. 
.FRI...E winds 10 to 15 kt, becoming SE. Seas 2 to 4 ft. 
.FRI NIGHT...S winds 15 to 25 kt. Seas building to 4 to 7 ft. 

$$

ANZ828-190400-
Cape Charles Light to Currituck Beach Light to 100 nm offshore-
934 AM EST Mon Dec 18 2017

.TODAY...W winds 5 to 15 kt. Seas 2 to 4 ft. 
.TONIGHT...W winds 10 to 20 kt, diminishing to 5 to 15 kt. Seas
3 to 5 ft. 
.TUE...W winds 5 to 15 kt, increasing to 10 to 20 kt. Seas 3 to
5 ft. 
.TUE NIGHT...W winds 10 to 20 kt. Seas 3 to 6 ft. 
.WED...NW winds 10 to 15 kt, becoming N. Seas 3 to 4 ft. 
.WED NIGHT...N winds 15 to 25 kt. Seas building to 4 to 7 ft.
.THU...N winds 15 to 20 kt, becoming N to NE 10 to 15 kt. Seas
4 to 6 ft. 
.THU NIGHT...E to NE winds 5 to 10 kt, becoming E 5 to 15 kt.
Seas 3 to 5 ft. 
.FRI...E to SE winds 5 to 15 kt, becoming SE 10 to 20 kt. Seas
2 to 4 ft. 
.FRI NIGHT...S to SE winds 15 to 25 kt. Seas building to 4 to 7 
ft.

$$

ANZ925-190400-
Baltimore Canyon to Hatteras Canyon between 100 nm and 250 nm
offshore-
934 AM EST Mon Dec 18 2017

.TODAY...W winds 15 to 25 kt. Seas 3 to 6 ft. 
.TONIGHT...W to NW winds 15 to 25 kt. Seas 3 to 6 ft. 
.TUE...NW winds 15 to 25 kt, becoming W 10 to 20 kt. Seas 3 to
6 ft. 
.TUE NIGHT...W winds 15 to 25 kt. Seas 4 to 7 ft. 
.WED...W to NW winds 10 to 20 kt. Seas 4 to 7 ft. 
.WED NIGHT...W to NW winds 15 to 25 kt, becoming N to NE. Seas
4 to 7 ft. 
.THU...N to NE winds 15 to 25 kt. Seas 4 to 8 ft. 
.THU NIGHT...NE winds 5 to 15 kt. Seas 4 to 6 ft. 
.FRI...E winds 5 to 15 kt, becoming SE 10 to 15 kt. Seas 3 to
6 ft. 
.FRI NIGHT...S to SE winds 15 to 25 kt. Seas 4 to 7 ft. 

$$

ANZ830-190400-
Currituck Beach Light to Cape Hatteras to 100 nm offshore-
934 AM EST Mon Dec 18 2017

.TODAY...W to NW winds 10 to 15 kt. Seas 2 to 4 ft. 
.TONIGHT...W to NW winds 15 to 25 kt. Seas 3 to 6 ft. Chance of
rain. 
.TUE...W winds 10 to 15 kt, becoming 10 to 20 kt. Seas 3 to
5 ft. 
.TUE NIGHT...W winds 10 to 20 kt. Seas 3 to 6 ft. 
.WED...NW winds 10 to 15 kt, becoming N 5 to 15 kt. Seas 2 to
4 ft. 
.WED NIGHT...NE winds 15 to 25 kt. Seas building to 4 to 8 ft. 
.THU...NE winds 15 to 25 kt. Seas 5 to 9 ft. 
.THU NIGHT...E to NE winds 5 to 15 kt. Seas subsiding to 3 to 6 
ft.
.FRI...E to SE winds 10 to 15 kt, becoming SE 10 to 20 kt. Seas
3 to 5 ft. 
.FRI NIGHT...SE winds 15 to 20 kt, becoming S 15 to 25 kt. Seas
4 to 7 ft. 

$$

ANZ833-190400-
Cape Hatteras to Cape Fear to 100 nm offshore-
934 AM EST Mon Dec 18 2017

.TODAY...W winds 5 to 15 kt. Seas 2 to 4 ft. 
.TONIGHT...W winds 15 to 25 kt. Seas 3 to 6 ft. 
.TUE...W winds 10 to 15 kt. Seas 3 to 5 ft. 
.TUE NIGHT...W winds 10 to 20 kt, becoming 10 to 15 kt. Seas
2 to 4 ft. 
.WED...W to NW winds 5 to 15 kt. Seas 3 to 5 ft. 
.WED NIGHT...W winds 20 to 30 kt, becoming NE. Seas 4 to 6 ft,
building to 6 to 10 ft.
.THU...NE winds 15 to 25 kt. Seas 6 to 11 ft. 
.THU NIGHT...E to NE winds 10 to 20 kt. Seas subsiding to 5 to 8
ft.
.FRI...E winds 10 to 20 kt, becoming SE 15 to 20 kt. Seas
subsiding to 3 to 5 ft. 
.FRI NIGHT...S to SE winds 15 to 25 kt. Seas 4 to 6 ft. 

$$

ANZ930-190400-
Hatteras Canyon to Cape Fear between 100 nm and 250 nm offshore-
934 AM EST Mon Dec 18 2017

.TODAY...W winds 15 to 25 kt. Seas 3 to 6 ft. 
.TONIGHT...W to NW winds 15 to 25 kt. Seas 4 to 7 ft. 
.TUE...NW winds 10 to 20 kt, becoming W. Seas 4 to 6 ft. 
.TUE NIGHT...W winds 10 to 20 kt. Seas 3 to 6 ft. 
.WED...W winds 5 to 15 kt. Seas 3 to 5 ft. 
.WED NIGHT...W winds 20 to 30 kt. Seas 4 to 6 ft, building to 6 
to 10 ft.
.THU...NE winds 15 to 25 kt. Seas 6 to 11 ft. 
.THU NIGHT...NE winds 10 to 20 kt, becoming E to NE 10 to 15 kt.
Seas subsiding to 5 to 8 ft. 
.FRI...E winds 10 to 20 kt. Seas 3 to 6 ft. 
.FRI NIGHT...SE winds 10 to 20 kt. Seas 4 to 6 ft. 

$$

ANZ835-190400-
Cape Fear to 31N to 1000 fm-
934 AM EST Mon Dec 18 2017

.TODAY...W winds 5 to 15 kt, increasing to 10 to 20 kt. Seas
2 to 4 ft. 
.TONIGHT...W winds 15 to 25 kt. Seas 3 to 6 ft. 
.TUE...W to NW winds 10 to 20 kt, becoming W 5 to 15 kt. Seas
3 to 6 ft. 
.TUE NIGHT...W winds 5 to 15 kt. Seas 2 to 4 ft. 
.WED...W winds 5 to 15 kt, becoming SW 15 to 25 kt. Seas 3 to
6 ft. 
.WED NIGHT...SW winds 20 to 30 kt, becoming W to NW. Seas
building to 6 to 11 ft. 
.THU...N to NE winds 15 to 25 kt. Seas 6 to 11 ft. 
.THU NIGHT...E to NE winds 15 to 25 kt, becoming N to NE. Seas
5 to 9 ft. 
.FRI...E to SE winds 10 to 20 kt. Seas 4 to 7 ft. 
.FRI NIGHT...SE winds 15 to 25 kt, becoming S 10 to 20 kt. Seas
4 to 7 ft. 

$$

ANZ935-190400-
Cape Fear to 31N east of 1000 fm to 250 nm offshore-
934 AM EST Mon Dec 18 2017

.TODAY...W to SW winds 15 to 25 kt. Seas 3 to 6 ft. 
.TONIGHT...W winds 15 to 25 kt. Seas 4 to 7 ft. Scattered showers
and TSTMs.
.TUE...W to NW winds 15 to 25 kt, diminishing to 10 to 15 kt.
Seas 4 to 7 ft. 
.TUE NIGHT...W winds 10 to 15 kt. Seas 3 to 5 ft. 
.WED...W winds 10 to 15 kt, becoming 10 to 20 kt. Seas 3 to
5 ft. 
.WED NIGHT...W to SW winds 20 to 30 kt. Seas 4 to 6 ft, building
to 6 to 11 ft.
.THU...NE winds 15 to 25 kt. Seas 6 to 11 ft. 
.THU NIGHT...E to NE winds 15 to 25 kt. Seas 5 to 9 ft. 
.FRI...E winds 15 to 20 kt. Seas 5 to 7 ft. 
.FRI NIGHT...E to SE winds 10 to 20 kt. Seas 4 to 6 ft. 

$$

.Forecaster Scovil. Ocean Prediction Center.
Last Update:14:35Z, 18 December 2017
Updates: Four times per day

FZNT01 KWBC 180949
HSFAT1

HIGH SEAS FORECAST FOR METAREA IV 
NWS OCEAN PREDICTION CENTER WASHINGTON DC 
1030 UTC MON DEC 18 2017 

CCODE/1:31:04:01:00/AOW/NWS/CCODE 
SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 

SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE 
HEIGHT OF THE HIGHEST 1/3 OF THE WAVES. INDIVIDUAL WAVES MAY 
BE MORE THAN TWICE THE SIGNIFICANT WAVE HEIGHT. 
ONLY YOU KNOW THE WEATHER AT YOUR POSITION. REPORT IT TO THE 
NATIONAL WEATHER SERVICE. EMAIL US AT 
VOSOPS@NOAA.GOV(LOWERCASE). 

SECURITE 

NORTH ATLANTIC NORTH OF 31N TO 67N AND WEST OF 35W 

SYNOPSIS VALID 0600 UTC DEC 18 
24 HOUR FORECAST VALID 0600 UTC DEC 19 
48 HOUR FORECAST VALID 0600 UTC DEC 20 

.WARNINGS. 

...STORM WARNING... 
.LOW 64N38W 964 MB MOVING N 30 KT. OVER FORECAST WATERS WITHIN 
180 NM N SEMICIRCLE AND 420 NM S AND SE QUADRANTS WINDS 40 TO 55 
KT. SEAS 20 TO 36 FT. ELSEWHERE N OF 55N E OF 42W WINDS 25 TO 40 
KT. SEAS 11 TO 24 FT. 
.24 HOUR FORECAST LOW DISSIPATED INLAND WITH NEW LOW 63N40W 975 
MB. BETWEEN 60 NM AND 240 NM S AND SE QUADRANTS WINDS 35 TO 50 
KT. SEAS 14 TO 25 FT. ELSEWHERE WITHIN 300 NM SE SEMICIRCLE  
WINDS 25 TO 35 KT. SEAS 9 TO 18 FT. 
.48 HOUR FORECAST LOW 65N39W 984 MB. BETWEEN 90 NM AND 360 NM S  
QUADRANT WINDS 35 TO 50 KT. SEAS 12 TO 24 FT. ELSEWHERE WITHIN 
600 NM S QUADRANT WINDS 25 TO 35 KT. SEAS 9 TO 17 FT.  

...STORM WARNING... 
.24 HOUR FORECAST NEW LOW 38N60W 1009 MB. WITHIN 240 NM S 
QUADRANT WINDS 25 TO 35 KT. SEAS 8 TO 12 FT. ELSEWHERE OVER 
FORECAST WATERS S OF A LINE FROM 41N72W TO 37N65W TO 36N56W 
WINDS 20 TO 30 KT. SEAS TO 10 FT. 
.48 HOUR FORECAST LOW 42N50W 995 MB. WITHIN 240 NM E AND SE 
QUADRANTS WINDS 35 TO 50 KT. SEAS 10 TO 18 FT. ELSEWHERE WITHIN 
90 NM W...300 NM N...360 NM S AND 540 NM E AND SE QUADRANTS 
WINDS 25 TO 35 KT. SEAS TO 11 FT.

...GALE WARNING... 
.LOW 55N45W 982 MB MOVING E 05 KT. WITHIN 300 NM SW QUADRANT 
WINDS 25 TO 35 KT. SEAS 13 TO 20 FT. ELSEWHERE FROM 50N TO 55N 
BETWEEN 35W AND 58W WINDS 20 TO 30 KT. SEAS 9 TO 19 FT. 
.24 HOUR FORECAST LOW 56N40W 998 MB. WITHIN 540 NM S SEMICIRCLE 
WINDS 20 TO 30 KT. SEAS 9 TO 18 FT. 
.48 HOUR FORECAST LOW AND ASSOCIATED CONDITIONS E OF AREA. 

...GALE WARNING... 
.LOW E OF AREA 54N31W 992 MB MOVING NE 45 KT. OVER FORECAST 
WATERS E OF A LINE FROM 33N41W TO 45N37W WINDS 25 TO 35 KT. SEAS 
9 TO 18 FT. ELSEWHERE FROM 31N TO 50N E OF 63W WINDS TO 25 KT. 
SEAS 8 TO 16 FT. 
.24 HOUR FORECAST FROM 31N TO 44N E OF 46W WINDS LESS THAN 25 
KT. SEAS TO 11 FT.  
.48 HOUR CONDITIONS WELL E OF AREA. 

...GALE WARNING... 
.LOW 59N56W 984 MB MOVING SE 15 KT. OVER FORECAST WATERS W OF A 
LINE FROM 55N52W TO 62N60W AND WITHIN 420 NM N AND NE QUADRANTS  
WINDS 25 TO 40 KT. SEAS 8 TO 19 FT. 
.24 HOUR FORECAST LOW 58N47W 990 MB. WITHIN 240 NM S...SE AND NW 
QUADRANTS WINDS 20 TO 30 KT. SEAS 8 TO 15 FT.  
.48 HOUR FORECAST LOW AND ASSOCIATED CONDITIONS ABSORBED BY LOW 
65N39W ABOVE.  

...GALE WARNING...
.48 HOUR FORECAST LOW INLAND 48N64W 987 MB. OVER FORECAST WATERS 
WITHIN 360 NM E AND 540 NM S QUADRANTS WINDS 25 TO 40 KT. SEAS 8 
TO 15 FT. ELSEWHERE WITHIN 420 NM E AND 900 NM S QUADRANTS WINDS 
20 TO 30 KT. SEAS TO 10 FT.

...HEAVY FREEZING SPRAY WARNING... 
.MODERATE TO HEAVY FREEZING SPRAY OVER FORECAST WATERS FROM 47N 
TO 50N W OF 60W...AND W OF A LINE FROM 51N53W TO 54N54W TO 
60N59W TO 67N54W.  
.24 HOUR FORECAST MODERATE TO HEAVY FREEZING SPRAY W OF LINE 
FROM 52N51W TO 60N59W TO 67N55W. 
.48 HOUR FORECAST MODERATE TO HEAVY FREEZING SPRAY N OF 63N W OF 
58W.  

.SYNOPSIS AND FORECAST. 

.48 HOUR FORECAST WITHIN 360 NM S OF A LINE FROM 60N44W TO 
54N55W AREA OF S TO SW WINDS 20 TO 30 KT. SEAS TO 11 FT. 

.24 HOUR FORECAST HIGH 43N50W 1022 MB. 
.48 HOUR FORECAST HIGH 46N35W 1026 MB. 

.FORECASTER KOSIER. OCEAN PREDICTION CENTER.

NATIONAL HURRICANE CENTER MIAMI FL

ATLANTIC FROM 07N TO 31N W OF 35W INCLUDING CARIBBEAN SEA AND
GULF OF MEXICO

SYNOPSIS VALID 0600 UTC MON DEC 18.
24 HOUR FORECAST VALID 0600 UTC TUE DEC 19.
48 HOUR FORECAST VALID 0600 UTC WED DEC 20.

.WARNINGS.

...CARIBBEAN GALE WARNING...
.FROM 11N TO 13N BETWEEN 74W AND 77W NE TO E WINDS 30 TO 35 KT. 
SEAS 12 TO 15 FT. ELSEWHERE FROM 09.5N TO 17.5N BETWEEN 72W AND 
83W...NE TO E WINDS 20 TO 30 KT. SEAS 8 TO 13 FT. N OF 14N 
BETWEEN 64W AND 70W...INCLUDING CARIBBEAN PASSAGES...NE TO E 
WINDS 20 TO 25 KT. SEAS 8 TO 9 FT...EXCEPT LESS THAN 8 FT 
CARIBBEAN PASSAGES. 
.12 HOUR FORECAST FROM 11N TO 13N BETWEEN 74W AND 77W NE TO E 
WINDS 25 TO 30 KT. SEAS 10 TO 13 FT. ELSEWHERE FROM 10N TO 17.5N 
BETWEEN 69W AND 81W NE TO E WINDS 20 TO 25 KT. SEAS 8 TO 13 FT. 
REMAINDER OF AREA S OF 18N BETWEEN 76W AND 83W WINDS 20 KT OR 
LESS. SEAS 8 TO 11 FT IN NE TO E SWELL. 
.18 HOUR FORECAST FROM 11N TO 13N BETWEEN 74W AND 77W NE TO E 
WINDS 30 TO 35 KT. SEAS 12 TO 14 FT. ELSEWHERE FROM 10N TO 17N 
BETWEEN 72W AND 81W NE TO E WINDS 20 TO 30 KT. SEAS 8 TO 12 FT. 
N OF 15N BETWEEN 70W AND 72W NE WINDS 20 TO 25 KT. SEAS TO 9 FT. 
REMAINDER OF AREA S OF 18N BETWEEN 76W AND 83W WINDS 20 KT OR 
LESS. SEAS 8 TO 11 FT IN NE TO E SWELL. 
.24 HOUR FORECAST LITTLE CHANGE. 
.36 HOUR FORECAST FROM 10.5N TO 16N BETWEEN 73W AND 80W NE TO E 
WINDS 20 TO 25 KT. SEAS 8 TO 12 FT. ELSEWHERE S OF 17.5N BETWEEN 
69W AND 83W WINDS 20 KT OR LESS. SEAS 8 TO 11 FT IN NE TO E 
SWELL. 
.42 HOUR FORECAST FROM 11N TO 13N BETWEEN 74W AND 77W NE TO E 
WINDS 30 TO 35 KT. SEAS 11 TO 13 FT. ELSEWHERE FROM 10N TO 17.5N 
BETWEEN 70W AND 80W...INCLUDING THE GULF OF VENEZUELA...NE TO E 
WINDS 20 TO 30 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA S OF 17.5N 
BETWEEN 76W AND 83W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN NE 
TO E SWELL. 
.48 HOUR FORECAST LITTLE CHANGE.

.SYNOPSIS AND FORECAST.

.ATLC COLD FRONT FROM 31N43W TO 25N55W TO 21N70W. N OF A LINE 
FROM 31N40W TO 25N51W TO 24N62W TO 31N64W WINDS 20 KT OR LESS. 
SEAS 8 TO 12 FT IN NW SWELL...HIGHEST N OF 29N BETWEEN 46W AND 
56W. 
.24 HOUR FORECAST DISSIPATING STATIONARY FRONT FROM 31N39W TO 
26N45W. N OF A LINE FROM 27N35W TO 20N50W TO 23N59W WINDS 20 KT 
OR LESS. SEAS 8 TO 10 FT IN NW SWELL.
.48 HOUR FORECAST FRONT DISSIPATED. WINDS 20 KT OR LESS. SEAS 
LESS THAN 8 FT.

.ATLC FROM 13N TO 20N E OF 45W WINDS 20 KT OR LESS. SEAS 8 TO 9 
FT IN MIXED NE AND NW SWELL. 
.12 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.ATLC S OF 21N BETWEEN 72W AND 74W...INCLUDING APPROACH TO 
WINDWARD PASSAGE...NE TO E WINDS 20 TO 25 KT. SEAS LESS THAN 
8 FT.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST LITTLE CHANGE.

.ATLC 36 HOUR FORECAST NEW COLD FRONT JUST N OF AREA. N OF 30N 
BETWEEN 58W AND 68W SW TO W WINDS 20 TO 25 KT. SEAS TO 8 FT. 
.48 HOUR FORECAST COLD FRONT FROM 31N56W TO 29N64W. N OF 30N 
BETWEEN 52W AND 61W WINDS 20 KT OR LESS. SEAS 8 FT IN NW SWELL. 

.CARIBBEAN N OF 18N BETWEEN 73W AND 76W...INCLUDING WINDWARD 
PASSAGE...NE TO E WINDS 20 TO 25 KT. SEAS TO 8 FT. N OF 18N 
BETWEEN 76W AND 83W NE TO E WINDS 20 TO 25 KT. SEAS TO 8 FT.
.24 HOUR FORECAST N OF 18N BETWEEN 73W AND 83W...INCLUDING 
WINDWARD PASSAGE...NE WINDS 20 TO 25 KT. SEAS TO 8 FT. N OF 18N 
BETWEEN 78W AND 80W NE WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT. 
.48 HOUR FORECAST N OF 18.5N BETWEEN 73W AND 76W...INCLUDING 
WINDWARD PASSAGE...NE WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.

.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

$$
.FORECASTER LATTO. NATIONAL HURRICANE CENTER.
Last Update:09:50Z, 18 December 2017
Updates: Four times per day