[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 031018
TWDAT

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1205 UTC Tue Jan 3 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
1050 UTC.

...MONSOON TROUGH/ITCZ...

The monsoon trough enters the Atlantic Ocean through the coast
of Liberia near 06N10W and continues to 06N16W. The ITCZ extends
from 06N16W to 02N30W to 01N50W. Scattered moderate convection is
noted from the equator to 10N between 26W and 50W.

GULF OF MEXICO...

A ridge dominates the Gulf waters E of 90W while low pressure has
built W of 90W associated with an approaching cold front. The
pressure gradient between the ridge and lower pressure across the
western half of the basin supports fresh to strong southerly
return flow basin-wide, being the strongest winds just W of 90W in
the central gulf. Seas are 5-8 ft over the NW Gulf due to the
strongest winds, and 4-6 ft elsewhere. Otherwise, moist southerly
flow across the Gulf waters will continue to favor the development
of dense marine fog during the morning hours. A Dense Fog Advisory
is in effect until the late morning hours for the coastal waters
from NE Texas to the Big Bend region in Florida. The dense fog is
likely to reduce the visibility to below 1 nm, creating hazardous
marine conditions.

For the forecast, a tight pressure gradient between a developing
winter storm over the US Southern Plains and high pressure over
the W Atlantic will force fresh to strong SE to S return flow
through tonight across the Gulf of Mexico. A cold front will
slowly move off of the Texas coast this afternoon, reaching from
the Big Bend of Florida to the Bay of Campeche Thu morning, and
cross the Gulf by Thu night accompanied by only moderate to fresh
winds in its wake on Fri and Sat. Patchy dense marine fog is
possible at times, especially within 120 NM of the US coastline
through this morning.

CARIBBEAN SEA...

Moderate to fresh trade winds prevail across most of the Caribbean
Sea, except for locally strong winds along the Windward Passage,
south of Hispaniola and offshore Colombia. Seas are in the 5-8 ft
range over the central Caribbean, and 4-6 ft elsewhere.

For the forecast, a surface ridge building north of the area will
force moderate to fresh trades across the Caribbean and the
tropical N Atlantic through the forecast period. Locally strong
trades are expected within 90 NM of the Colombian coast, within
the Windward Passage, and south of Hispaniola through the weekend.
A weak cold front is forecast to reach the NW Caribbean on Fri
with moderate to fresh NE winds and building seas Fri night and
Sat.

ATLANTIC OCEAN...

High pressure dominates most of the Atlantic discussion waters
with a main 1032 mb center located between the Azores and the
Madeira Islands near 35N21W. A surface trough is analyzed from
31N57W to 24N65W. Some shower activity is near the trough axis.
Light to gentle winds prevail across much of the waters north of
20N and west of 45W under the influence of a ridge. The pressure
gradient between the ridge and lower pressures in the vicinity of
the ITCZ is resulting in moderate to locally fresh trade winds
across the tropical Atlantic with seas generally in the 5-7 ft
range. Similar sea heights are noted N of the Cabo Verde Islands
and E of 35W. Abundant cloudiness, with possible embedded showers,
associated with strong upper-level westerly winds dominates most
of the tropical Atlantic.

For the forecast W of 55W, surface ridging over the SW N Atlantic
waters will promote gentle or weaker winds north of 25N through
early Wed. As the ridge strengthens on Wed and Thu, it will force
fresh to strong tradewinds south of 25N including the Windward
Passage. Fresh to strong SW winds ahead of a cold front are
anticipated to occur north of the Bahamas on Wed and Thu. After
emerging from the SE United States coast Thu night, the cold front
should extend from Bermuda to the central Bahamas Sat morning
with moderate to fresh NW to N winds in its wake.

$$
Ramos
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