AGXX40 KNHC 271819
Marine Weather Discussion
NWS National Hurricane Center Miami FL
219 PM EDT Mon Mar 27 2017
Marine Weather Discussion for the Gulf of Mexico, Caribbean Sea,
and Tropical North Atlantic from 07N to 19N between 55W and 64W
and the Southwest North Atlantic including the Bahamas
...GULF OF MEXICO...
High pressure northeast of the region will support moderate to
fresh southeast winds over the basin through Tuesday. The
exception will be fresh to strong east to northeast winds tonight
associated with a thermal trough moving westward off the coast of
the Yucatan peninsula over the eastern Bay of Campeche. By
Tuesday night, low pressure will deepen as it moves eastward
across the southern plains, and high pressure will settle across
the Bahamas. This will tighten the pressure gradient across the
western Gulf Tuesday night through Wednesday with fresh to strong
southeast winds and seas building to 9 ft. The highest seas will
be across the northwestern Gulf. As the low continues eastward
late this week, a cold front will cross the Gulf from west to
east. Current forecast has the front entering the northwestern
Gulf Thursday, then reaching the northeastern Gulf by Friday
night, while remaining north of about 27N. Scattered to numerous
showers and thunderstorms are expected to spread east just ahead
of this front.
...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N
BETWEEN 55W AND 64W...
A weak pressure pattern continues over the Caribbean today
thanks to the low pressure over the SW N Atlantic. Gentle to
moderate winds prevail over the Caribbean and will continue to do
so through Tuesday. High pressure will settle across the Bahamas
Tuesday night as the low moves northeast then east over the
central Atlantic, which will help to increase the winds slightly
across the Caribbean basin. The high will expand across the SW N
Atlantic by Wednesday night which will cause fresh to strong
winds to develop across the Gulf of Honduras through Friday. The
high will then slide eastward by Friday night as a cold front
approaches the southeast U.S. This will allow winds across the
central Caribbean to increase to 15 to 20 kt during the Friday
night through Saturday time period.
Mainly 5 to 7 ft seas will prevail over the tropical N Atlantic
forecast zones through the week along with moderate trade winds.
Late this week, winds are expected to decrease as the low
pressure passing north of the area brings a frontal trough near
the region north of 15N.
...SW N ATLANTIC INCLUDING THE BAHAMAS...
Low pressure of 1007 mb near 24N69W will meander slowly northward
through this evening, then will begin a more steady track
northeast overnight tonight. The low will then exit the
northeast zone AMZ115 on Tuesday. Gale force north to northeast
winds will continue within 100 and 250 nm north of the low
center through Tuesday, which will maintain gale force winds
over the northeast zone through tonight. The gale force winds
will then shift east of the forecast zones on Tuesday, but will
remain over our high seas area. A broad area of Strong winds are
occurring across all quadrants of the low except the SE quadrant
with seas of 10 to 17 ft under this swath of strong to gale force
winds. The region of stronger winds will move in tandem with the
low through Tuesday, with strong to near gale northerly winds
persisting across the northeastern waters behind the departing
low until early Tuesday night. Seas greater than 8 ft will linger
over the northeast zones behind the departing low until
High pressure will settle across the Bahamas by Tuesday night,
then expand in coverage through Wednesday night. The high will
then slide east Thursday night as a cold front approaches the
northwest waters. Current forecast has the cold front reaching
the northwest waters Friday night, with fresh to strong southerly
winds developing on Friday over these waters well ahead of the
.WARNINGS...Any changes impacting coastal NWS offices will be
coordinated through AWIPS II Collaboration Chat, or by
.GULF OF MEXICO...
.CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN
55W AND 64W...
.SW N ATLANTIC INCLUDING THE BAHAMAS...
.AMZ115...ATLANTIC FROM 27N TO 31N BETWEEN 65W AND 70W...
Gale Warning today into tonight.
*For detailed zone descriptions, please visit:
Note: gridded marine forecasts are available in the National
Digital Forecast Database (NDFD) at:
For additional information, please visit:
.Forecaster Latto. National Hurricane Center.