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Atlantic Tropical Weather Discussion



489 
AXNT20 KNHC 261752
TWDAT 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1805 UTC Tue Jan 26 2021

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 32N. The following information is based on satellite
imagery, weather observations, radar and meteorological analysis.

Based on 1200 UTC surface analysis and satellite imagery through 
1745 UTC.

...SPECIAL FEATURES...

Atlantic Gale Warning: The pressure gradient between high 
pressure anchored near the Canary Islands and a cold front 
located in the central Atlantic is generating gale force winds 
ahead of the front N of 30N between 37W and 39W with seas to 20 
ft. Winds will diminish to strong later today. Both winds and 
seas will then gradually subside as the cold front weakens and 
dissipates by Wednesday afternoon.

Atlantic Gale Warning: A strong cold front will move off the SE 
U.S coast Wed night while the associated low pressure rapidly 
intensifies north of the forecast region. Near gale to gale 
force winds and very large seas are expected with this system 
Wed night through early Fri, mainly N of 26N from the NE Florida 
offshore waters all the way to the central Atlantic waters. Seas 
as high as 20 to 30 ft are expected across the western and 
central Atlantic, particularly N of 27N between 50W and 70W by 
Thu night, with seas of 12 ft reaching the waters just E of the 
northern and central Bahamas. These hazardous marine conditions 
will dominate the central Atlantic by Fri.

Caribbean Gale Warning: High pressure located N of the Caribbean 
Sea combined with a developing low over NW Colombia will support 
minimal gale force winds over Colombia adjacent waters tonight 
through early Wed morning. Wave heights in the range of 10-14 ft 
are expected during the peak winds tonight. Gale conditions are 
possible again Friday and Saturday night. 

Gulf of Mexico Gale Warning: A reinforcing cold front will reach 
a stationary front analyzed along the far western Gulf of Mexico 
by Wed morning, and the combined front will quickly move 
southeastward across the basin through Thu. Strong to near 
gale-force northerly winds will follow the front, with gales 
developing over the W-central Gulf on Wed and over SW Gulf late 
Wed early evening through Thu. Seas are forecast to build to 
10-14 ft over the SW Gulf by early Thu morning.

Please read the latest NWS High Seas Forecast issued by the 
National Hurricane Center at the website 
https://www.nhc.noaa.gov/text/MIAHSFAT2.shtml for more details.

...MONSOON TROUGH/ITCZ...

The monsoon trough extends from the coast of Liberia, Africa 
near 05N10W and continues to 04N14W. The ITCZ then continues 
from 04N14W to 04N36W to the coast of Brazil near 00N50W. 
Scattered moderate convection is within 180 nm either side of 
the ITCZ W of 17W.

GULF OF MEXICO...

Please refer to the Special Features section above for details 
about a gale warning for the far western Gulf of Mexico.

Southerly flow ahead of a stationary front extending from 
south-central Louisiana SW to a 1005 mb low just east of 
Tamiahua, Mexico continues to support patchy dense fog over the 
NW gulf waters. These conditions are expected to prevail through 
this evening. No deep convection is associated with the front, 
except over Alabama and the Florida panhandle coastal waters 
where low to middle level moisture and diffluence aloft support 
scattered showers and tstms. 

The far eastern basin is under the influence of a ridge that 
extends from the SW N Atlantic into this portion of the Gulf. 
Moderate to locally fresh SE to S winds are over the central and 
SW basin ahead of the front while light to gentle winds prevail 
elsewhere E of the front. Otherwise, moderate NE winds are 
behind the front along the coast of Texas.

A reinforcing cold front will reach the stationary front by Wed 
morning and the combined front will quickly move southeastward 
across the basin through Thu. Strong to near gale-force N winds 
will follow the front, with gales developing over W-central Gulf 
on Wed and over SW Gulf late Wed early evening  through Thu. 
Winds and seas will diminish on Fri. Return S winds should begin 
building over W Gulf on Sat.

CARIBBEAN SEA...

Please refer to the Special Features section above for details 
about a gale warning for the Colombia adjacent waters.

According to recent scatterometer data, strong to near gale-
force winds persist from the coast of Colombia to 15N between 
72W and 78W. Elsewhere, mainly moderate to fresh trade winds 
prevail, pulsing to fresh to strong over the Gulf of Honduras 
through tonight with seas building to 4-6 ft. Isolated showers 
are possible in the trade flow. Otherwise, the tail of a cold 
front is moving across the northern Leeward Islands and Puerto 
Rico today, supporting isolated showers. 

A strong cold front will enter the NW Caribbean on Thu followed 
by fresh to strong NE winds over the NW Caribbean waters on Fri, 
and through the Atlantic  passages on Sat. N swell will 
propagate into the NE Caribbean passages and Tropical N Atlantic 
waters today through Thu.

ATLANTIC OCEAN

Please refer to the Special Features section above for details 
about two gale warnings.

A 1021 mb high pressure currently governs the weather across the 
western Atlantic, with gentle to moderate southerly winds 
detected by the latest scatterometer pass.

For the forecast in the western Atlantic, low pressure crossing 
north of Bermuda will bring fresh to strong W winds to the NE 
waters today. A strong cold front will move off the SE U.S coast 
Wed night while the associated low pressure rapidly intensifies 
north of the forecast area. Gale force winds and very large seas 
are expected with this system Wed night through Thu night, 
mainly N of 26N. Winds and seas should diminish Fri and Sat.

A cold front extends across the central and western Atlantic from
31N38W to 24N47W to the northern Leeward Islands near 18N65W. 
Fresh to strong winds are noted both ahead and behind the front 
N of 26N based on recent ASCAT data. Scattered showers moving 
westward ahead of the front north of 26N are weakening. This 
frontal boundary will continue to push across the northern 
Leeward Islands and Puerto Rico today.

The remainder of the Atlantic forecast area is under the 
influence of a ridge, anchored by a 1029 mb high pressure 
located northeast of the Madeira Islands. Gentle to moderate 
winds are along the southern periphery of the ridge. Winds 
increase to moderate to fresh between the Canary Islands and the 
W coast of Africa as well as from 20N-25N E of 28W.

$$
Mahoney/Ramos