AGXX40 KNHC 201720
Marine Weather Discussion
NWS National Hurricane Center Miami FL
120 PM EDT Sun Aug 20 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...
A few showers and thunderstorms are active across the SE Gulf on
the SE side of an upper low centered over the eastern Gulf near
25N86W. An associated surface trough is analyzed over the Florida
peninsula. This weather will move with the upper low as it
tracks WNW toward the Texas coast through mid week, while winds
will increase to fresh in the SE Gulf through the Straits of
Florida in the wake of the surface trough through the early part
of the week. Meanwhile the remnants of Harvey in the Caribbean
will move across the Yucatan peninsula Tue. The remnants may
emerge into the far SW Gulf/Bay of Campeche Wed bringing
increasing winds and seas along with active convection, possibly
as a tropical cyclone. Another surface trough will move from E
to W across the basin Tue night through the end of the week.
Elsewhere, weak ridging will persist across the northern Gulf or
along the northern coast, maintaining light to gentle winds and
...CARIBBEAN SEA AND TROPICAL N ATLANTIC FROM 07N TO 19N BETWEEN
55W AND 64W...
A tropical wave over the NW Caribbean through the Gulf of
Honduras and across Honduras and western Nicaragua continues to
move westward supporting scattered showers and thunderstorms.
The tropical wave will exit the area tonight.
Farther E, the remnants of former tropical cyclone Harvey are
centered over the central Caribbean between S-SE of Jamaica and
northern Colombia near 14N75W. The convection was quite
disorganized yesterday and through much of the night, but has
redeveloped during the early morning hours through the early
afternoon. It is not clear if a closed circulation has
redeveloped, but an aircraft is scheduled to investigate the area
this afternoon to see if redevelopment is occurring. At any
rate, the remnants of Harvey be accompanied by scattered
thunderstorms, along with fresh to strong winds and seas of 8 to
10 ft on its northern periphery as it continues to move WNW
through the northwest Caribbean through early Tue. Interests in
Central America should continue to monitor http://hurricanes.gov
for the latest on this area.
Moderate to fresh easterly trade winds will follow in the wake
of the remnants of Harvey across the Caribbean, and also following
another tropical wave in the eastern Caribbean moving across the
central Caribbean through mid week. Winds will pulse to fresh to
strong in the S central Caribbean late Wed night through the end
of the week as the pressure gradient tightens across that area.
Yet another tropical wave will pass 55W Tue, and enter the
eastern Caribbean early Wed.
...SW N ATLANTIC INCLUDING THE BAHAMAS...
Scattered showers and thunderstorms are active from across the
gulfstream to the Florida Keys associated with a surface trough
currently along the E coast of the Florida peninsula. A strong
surface trough is located to the E, just S of 27N along 66W/67W
with numerous showers and scattered thunderstorms within 75 nm of
the trough axis. An area of fresh to strong winds and seas of 8
to 10 ft also accompany the trough. Meanwhile, ridging extends
from E to W along 30N. The ridge will lift northward as the
trough continues to progress to the W, reaching the southern
Bahamas and Turks/Caicos late tonight. Weak ridging will build
across the area by mid-week with fairly tranquil marine
conditions expected basin-wide.
.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...
*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 Lewitsky. National Hurricane Center.