AXNT20 KNHC 071048
Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1205 UTC Thu Dec 7 2023
Tropical Weather Discussion for North America, Central America
Gulf of Mexico, Caribbean Sea, northern sections of South
America, and Atlantic Ocean to the African coast from the
Equator to 31N. The following information is based on satellite
imagery, weather observations, radar and meteorological analysis.
Based on 0600 UTC surface analysis and satellite imagery through
Atlantic Ocean Gale Warning...
A primary cold front curves southwestward from 31N61W to beyond
the eastern tip of Cuba. Scattered moderate convection is seen
within 120 nm east of this front, mainly north of 28N and east of
59W. A secondary cold front extends southwestward from near 31N64W
to Andros Island, Bahamas. Near-gale to gale-force winds are
occurring north of 28N between 52W and 67W. Fresh to strong winds
are elsewhere north of 24N between 41W and 77W. An 07/0300 UTC
satellite altimeter pass measured seas up to 18 ft near 30N63W.
Currently, seas of 12 to 19 ft are likely occurring north of 26.5N
between 52W and 75.5W, highest north of 28N between 58W and 71W.
The fronts are expected to merge this afternoon while moving
southeastward toward the central Atlantic. As a result, these
winds and seas will shift eastward into the central Atlantic
through this afternoon. As the combined front pulls farther
eastward and weakens, conditions should begin to improve tonight.
Please read the latest High Seas and Offshore Waters Forecasts
issued by the National Hurricane Center at
www.nhc.noaa.gov/marine/offshores.php for more details.
A monsoon trough enters the Atlantic near the Guinea-Bissau/Guinea
border near 11N15W then extends southwestward to 06N18W. An ITCZ
continues westward from 06N18W across 03N33W to 07N50W. Scattered
moderate isolated strong convection is noted along and within 180
nm N of the ITCZ between 33W and 49W.
...GULF OF MEXICO...
A 1028 mb high pressure centered over Alabama spreads ridging
across the Gulf of Mexico. Some isolated showers are noted in the
south-central portion of the basin. In the SE and south-central
Gulf, winds are NE moderate to locally fresh, with 5 to 7 ft seas.
Elsewhere, winds are gentle to moderate with 3 to 5 ft seas.
For the forecast, moderate or weaker winds will prevail today.
The high pressure over Alabama will shift eastward into the
Atlantic tonight, inducing moderate to locally fresh return flow
across most of the basin Fri through Sat. A strong cold front is
forecast to enter the NW Gulf Sat evening. The front will reach
from Cedar Key, Florida to Cancun, Mexico Sun evening, and exit
the basin by Mon morning. Strong to near-gale force winds are
expected behind the front, with gale force winds possible across
the western Gulf, from offshore southern Texas southward to the
Bay of Campeche Sat night through Sun evening. Strong NW gales
near 45 kt are possible offshore Veracruz Sun afternoon.
A cold front stretches west-southwestward from the eastern tip of
Cuba across the Gulf of Honduras to southern Belize. Isolated
showers are evident over the northwest Caribbean. Fresh to locally
strong NE winds are north of the front, over the NW Caribbean,
along with 5 to 7 ft seas. A trade-wind regime continues for the
remainder of the basin with isolated showers noted in the SE
Caribbean. Fresh to strong NE to ENE winds and 6 to 9 ft seas
dominate the south-central basin, including the Gulf of
Venezuela. Gentle to moderate NE to ESE winds and seas at 4 to 6
ft prevail in the eastern Caribbean.
For the forecast, the cold front will reach from the N coast of
Hispaniola to the Gulf of Honduras tonight, where it will remain
nearly stationary through Fri night before dissipating Sat. Fresh
to strong NE winds N of the front across the northwest Caribbean
will diminish slightly late today. However, strong winds will
develop in the Windward Passage this afternoon with the front and
expand across most of the east and central Caribbean, lasting from
tonight through Sun. By late Sun, the majority of these winds are
expected to be over the central Caribbean. Looking ahead, the
next cold front could enter the northwest Caribbean by early next
Please read the SPECIAL FEATURES section at the beginning about
an ongoing Gale Warning, which covers the weather from 24N to 31N
between 40W and 81W.
Fresh N winds extend across the Bahamas to Cuba. Seas of 8 to 10
ft are reaching the northern Bahamas on the Atlantic side. A
narrow surface ridge, with comparatively lighter winds and lower
seas, extends from 1021 mb high pressure near 31N24W to 1021 mb
high pressure near 27N39W to 21N55W to the Dominican Republic. To
the south, fresh trade winds and 6 to 9 ft seas prevail from 04N
to 18N between 30W and 60W.
For the forecast W of 55W, a cold front extends from near 31N61W
to the eastern tip of Cuba. A secondary cold front trails it,
extending from 31N64W to Andros Island, Bahamas. The secondary
front will speed up and merge with the first front by late today.
The main front will reach from near 25N55W to the N coast of
Hispaniola this evening. Gale force winds and high seas are
expected both ahead of and behind this front, to the north of 28N
through late this afternoon. The gale winds will shift east of 60W
by this afternoon. The front will stall and weaken along 20N Fri
through Sat as strong high pressure builds across the western
Atlantic. The gradient between the strong high pressure along 31N
and lower pressure associated with the stalled front will induce
fresh to strong ENE trade winds south of 23N Fri through Sun. On
Sun, the front will dissipate as fresh to strong southerly flow
sets up over the waters east of northeast Florida to 69W in
advance of the next cold front. This cold front is expected to
move into the NW forecast waters late Sun, followed by fresh to
strong northwest winds. Seas will build both east and west of this